SL-13078 Split LLModelPreview and LLFloaterModelPreview into separate files

5 files changed, 3827 insertions, 3749 deletions

diff --git a/indra/newview/CMakeLists.txt b/indra/newview/CMakeLists.txt
index c9d5fb89ba..65cee71b1d 100644
--- a/indra/newview/CMakeLists.txt
+++ b/indra/newview/CMakeLists.txt
@@ -399,6 +399,7 @@ set(viewer_SOURCE_FILES
     llmenuoptionpathfindingrebakenavmesh.cpp
     llmeshrepository.cpp
     llmimetypes.cpp
+    llmodelpreview.cpp
     llmorphview.cpp
     llmoveview.cpp
     llmutelist.cpp
@@ -1025,6 +1026,7 @@ set(viewer_HEADER_FILES
     llmenuoptionpathfindingrebakenavmesh.h
     llmeshrepository.h
     llmimetypes.h
+    llmodelpreview.h
     llmorphview.h
     llmoveview.h
     llmutelist.h
diff --git a/indra/newview/llfloatermodelpreview.cpp b/indra/newview/llfloatermodelpreview.cpp
index 3564d7c241..9c62680dde 100644
--- a/indra/newview/llfloatermodelpreview.cpp
+++ b/indra/newview/llfloatermodelpreview.cpp
@@ -27,7 +27,7 @@
 #include "llviewerprecompiledheaders.h"
 
 #include "llmodelloader.h"
-#include "lldaeloader.h"
+#include "llmodelpreview.h"
 
 #include "llfloatermodelpreview.h"
 
@@ -40,13 +40,7 @@
 #include "llagent.h"
 #include "llbutton.h"
 #include "llcombobox.h"
-#include "lldatapacker.h"
-#include "lldrawable.h"
-#include "llrender.h"
-#include "llface.h"
 #include "llfocusmgr.h"
-#include "llfloaterperms.h"
-#include "lliconctrl.h"
 #include "llmatrix4a.h"
 #include "llmenubutton.h"
 #include "llmeshrepository.h"
@@ -57,17 +51,10 @@
 #include "lltoolmgr.h"
 #include "llui.h"
 #include "llvector4a.h"
-#include "llviewercamera.h"
 #include "llviewerwindow.h"
-#include "llvoavatar.h"
-#include "llvoavatarself.h"
 #include "pipeline.h"
-#include "lluictrlfactory.h"
 #include "llviewercontrol.h"
-#include "llviewermenu.h"
 #include "llviewermenufile.h"
-#include "llviewerregion.h"
-#include "llviewertexturelist.h"
 #include "llstring.h"
 #include "llbutton.h"
 #include "llcheckboxctrl.h"
@@ -81,21 +68,14 @@
 #include "llvfile.h"
 #include "llvfs.h"
 #include "llcallbacklist.h"
-#include "llviewerobjectlist.h"
-#include "llanimationstates.h"
 #include "llviewertexteditor.h"
 #include "llviewernetwork.h"
-#include "llviewershadermgr.h"
 
-#include "glod/glod.h"
-#include <boost/algorithm/string.hpp>
 
 //static
 S32 LLFloaterModelPreview::sUploadAmount = 10;
 LLFloaterModelPreview* LLFloaterModelPreview::sInstance = NULL;
 
-bool LLModelPreview::sIgnoreLoadedCallback = false;
-
 // "Retain%" decomp parameter has values from 0.0 to 1.0 by 0.01
 // But according to the UI spec for upload model floater, this parameter
 // should be represented by Retain spinner with values from 1 to 100 by 1.
@@ -109,111 +89,17 @@ const double RETAIN_COEFFICIENT = 100;
 // So this const is used as a size of Smooth combobox list.
 const S32 SMOOTH_VALUES_NUMBER = 10;
 
-const F32 SKIN_WEIGHT_CAMERA_DISTANCE = 16.f;
-
-void drawBoxOutline(const LLVector3& pos, const LLVector3& size);
-
-
-std::string lod_name[NUM_LOD+1] =
+class LLMeshFilePicker : public LLFilePickerThread
 {
-	"lowest",
-	"low",
-	"medium",
-	"high",
-	"I went off the end of the lod_name array.  Me so smart."
-};
-
-std::string lod_triangles_name[NUM_LOD+1] =
-{
-	"lowest_triangles",
-	"low_triangles",
-	"medium_triangles",
-	"high_triangles",
-	"I went off the end of the lod_triangles_name array.  Me so smart."
-};
-
-std::string lod_vertices_name[NUM_LOD+1] =
-{
-	"lowest_vertices",
-	"low_vertices",
-	"medium_vertices",
-	"high_vertices",
-	"I went off the end of the lod_vertices_name array.  Me so smart."
-};
+public:
+    LLMeshFilePicker(LLModelPreview* mp, S32 lod);
+    virtual void notify(const std::vector<std::string>& filenames);
 
-std::string lod_status_name[NUM_LOD+1] =
-{
-	"lowest_status",
-	"low_status",
-	"medium_status",
-	"high_status",
-	"I went off the end of the lod_status_name array.  Me so smart."
-};
-
-std::string lod_icon_name[NUM_LOD+1] =
-{
-	"status_icon_lowest",
-	"status_icon_low",
-	"status_icon_medium",
-	"status_icon_high",
-	"I went off the end of the lod_status_name array.  Me so smart."
-};
-
-std::string lod_status_image[NUM_LOD+1] =
-{
-	"ModelImport_Status_Good",
-	"ModelImport_Status_Warning",
-	"ModelImport_Status_Error",
-	"I went off the end of the lod_status_image array.  Me so smart."
-};
-
-std::string lod_label_name[NUM_LOD+1] =
-{
-	"lowest_label",
-	"low_label",
-	"medium_label",
-	"high_label",
-	"I went off the end of the lod_label_name array.  Me so smart."
+private:
+    LLModelPreview* mMP;
+    S32 mLOD;
 };
 
-BOOL stop_gloderror()
-{
-	GLuint error = glodGetError();
-
-	if (error != GLOD_NO_ERROR)
-	{
-		LL_WARNS() << "GLOD error detected, cannot generate LOD: " << std::hex << error << LL_ENDL;
-		return TRUE;
-	}
-
-	return FALSE;
-}
-
-LLViewerFetchedTexture* bindMaterialDiffuseTexture(const LLImportMaterial& material)
-{
-	LLViewerFetchedTexture *texture = LLViewerTextureManager::getFetchedTexture(material.getDiffuseMap(), FTT_DEFAULT, TRUE, LLGLTexture::BOOST_PREVIEW);
-
-	if (texture)
-	{
-		if (texture->getDiscardLevel() > -1)
-		{
-			gGL.getTexUnit(0)->bind(texture, true);
-			return texture;
-		}
-	}
-
-	return NULL;
-}
-
-std::string stripSuffix(std::string name)
-{
-	if ((name.find("_LOD") != -1) || (name.find("_PHYS") != -1))
-	{
-		return name.substr(0, name.rfind('_'));
-	}
-	return name;
-}
-
 LLMeshFilePicker::LLMeshFilePicker(LLModelPreview* mp, S32 lod)
 : LLFilePickerThread(LLFilePicker::FFLOAD_COLLADA)
 	{
@@ -234,30 +120,6 @@ void LLMeshFilePicker::notify(const std::vector<std::string>& filenames)
 	}
 }
 
-void FindModel(LLModelLoader::scene& scene, const std::string& name_to_match, LLModel*& baseModelOut, LLMatrix4& matOut)
-{
-    LLModelLoader::scene::iterator base_iter = scene.begin();
-    bool found = false;
-    while (!found && (base_iter != scene.end()))
-    {
-        matOut = base_iter->first;
-
-        LLModelLoader::model_instance_list::iterator base_instance_iter = base_iter->second.begin();
-        while (!found && (base_instance_iter != base_iter->second.end()))
-        {
-		    LLModelInstance& base_instance = *base_instance_iter++;					    		    
-            LLModel* base_model = base_instance.mModel;
-         
-            if (base_model && (base_model->mLabel == name_to_match))
-            {
-                baseModelOut = base_model;
-                return;
-            }
-        }
-        base_iter++;
-    }
-}
-
 //-----------------------------------------------------------------------------
 // LLFloaterModelPreview()
 //-----------------------------------------------------------------------------
@@ -564,13 +426,6 @@ void LLFloaterModelPreview::onClickCalculateBtn()
 	bool upload_joint_positions = childGetValue("upload_joints").asBoolean();
     bool lock_scale_if_joint_position = childGetValue("lock_scale_if_joint_position").asBoolean();
 
-    if (upload_joint_positions)
-    {
-        // Diagnostic message showing list of joints for which joint offsets are defined.
-        // FIXME - given time, would be much better to put this in the UI, in updateStatusMessages().
-		mModelPreview->getPreviewAvatar()->showAttachmentOverrides();
-    }
-
     mUploadModelUrl.clear();
     mModelPhysicsFee.clear();
 
@@ -1590,195 +1445,6 @@ void LLFloaterModelPreview::addStringToLogTab(const std::string& str, bool flash
     }
 }
 
-//-----------------------------------------------------------------------------
-// LLModelPreview
-//-----------------------------------------------------------------------------
-
-LLModelPreview::LLModelPreview(S32 width, S32 height, LLFloater* fmp)
-: LLViewerDynamicTexture(width, height, 3, ORDER_MIDDLE, FALSE), LLMutex()
-, mLodsQuery()
-, mLodsWithParsingError()
-, mPelvisZOffset( 0.0f )
-, mLegacyRigFlags( U32_MAX )
-, mRigValidJointUpload( false )
-, mPhysicsSearchLOD( LLModel::LOD_PHYSICS )
-, mResetJoints( false )
-, mModelNoErrors( true )
-, mLastJointUpdate( false )
-, mHasDegenerate( false )
-, mImporterDebug(LLCachedControl<bool>(gSavedSettings, "ImporterDebug", false))
-{
-	mNeedsUpdate = TRUE;
-	mCameraDistance = 0.f;
-	mCameraYaw = 0.f;
-	mCameraPitch = 0.f;
-	mCameraZoom = 1.f;
-	mTextureName = 0;
-	mPreviewLOD = 0;
-	mModelLoader = NULL;
-	mMaxTriangleLimit = 0;
-	mDirty = false;
-	mGenLOD = false;
-	mLoading = false;
-	mLoadState = LLModelLoader::STARTING;
-	mGroup = 0;
-	mLODFrozen = false;
-	mBuildShareTolerance = 0.f;
-	mBuildQueueMode = GLOD_QUEUE_GREEDY;
-	mBuildBorderMode = GLOD_BORDER_UNLOCK;
-	mBuildOperator = GLOD_OPERATOR_EDGE_COLLAPSE;
-
-	for (U32 i = 0; i < LLModel::NUM_LODS; ++i)
-	{
-		mRequestedTriangleCount[i] = 0;
-		mRequestedCreaseAngle[i] = -1.f;
-		mRequestedLoDMode[i] = 0;
-		mRequestedErrorThreshold[i] = 0.f;
-		mRequestedBuildOperator[i] = 0;
-		mRequestedQueueMode[i] = 0;
-		mRequestedBorderMode[i] = 0;
-		mRequestedShareTolerance[i] = 0.f;
-	}
-
-	mViewOption["show_textures"] = false;
-
-	mFMP = fmp;
-
-	mHasPivot = false;
-	mModelPivot = LLVector3( 0.0f, 0.0f, 0.0f );
-	
-	glodInit();
-
-	createPreviewAvatar();
-}
-
-LLModelPreview::~LLModelPreview()
-{
-	// glod apparently has internal mem alignment issues that are angering
-	// the heap-check code in windows, these should be hunted down in that
-	// TP code, if possible
-	//
-	// kernel32.dll!HeapFree()  + 0x14 bytes	
-	// msvcr100.dll!free(void * pBlock)  Line 51	C
-	// glod.dll!glodGetGroupParameteriv()  + 0x119 bytes	
-	// glod.dll!glodShutdown()  + 0x77 bytes	
-	//
-	//glodShutdown();
-	if(mModelLoader)
-	{
-		mModelLoader->shutdown();
-	}
-}
-
-U32 LLModelPreview::calcResourceCost()
-{
-	assert_main_thread();
-
-	rebuildUploadData();
-
-	//Upload skin is selected BUT check to see if the joints coming in from the asset were malformed.
-	if ( mFMP && mFMP->childGetValue("upload_skin").asBoolean() )
-	{
-		bool uploadingJointPositions = mFMP->childGetValue("upload_joints").asBoolean();
-		if ( uploadingJointPositions && !isRigValidForJointPositionUpload() )
-		{
-			mFMP->childDisable("ok_btn");		
-		}		
-	}
-	
-	std::set<LLModel*> accounted;
-	U32 num_points = 0;
-	U32 num_hulls = 0;
-
-	F32 debug_scale = mFMP ? mFMP->childGetValue("import_scale").asReal() : 1.f;
-	mPelvisZOffset = mFMP ? mFMP->childGetValue("pelvis_offset").asReal() : 3.0f;
-	
-	if ( mFMP && mFMP->childGetValue("upload_joints").asBoolean() )
-	{
-		// FIXME if preview avatar ever gets reused, this fake mesh ID stuff will fail.
-		// see also call to addAttachmentPosOverride.
-		LLUUID fake_mesh_id;
-		fake_mesh_id.generate();
-		getPreviewAvatar()->addPelvisFixup( mPelvisZOffset, fake_mesh_id );
-	}
-
-	F32 streaming_cost = 0.f;
-	F32 physics_cost = 0.f;
-	for (U32 i = 0; i < mUploadData.size(); ++i)
-	{
-		LLModelInstance& instance = mUploadData[i];
-		
-		if (accounted.find(instance.mModel) == accounted.end())
-		{
-			accounted.insert(instance.mModel);
-
-			LLModel::Decomposition& decomp =
-			instance.mLOD[LLModel::LOD_PHYSICS] ?
-			instance.mLOD[LLModel::LOD_PHYSICS]->mPhysics :
-			instance.mModel->mPhysics;
-			
-			//update instance skin info for each lods pelvisZoffset 
-			for ( int j=0; j<LLModel::NUM_LODS; ++j )
-			{	
-				if ( instance.mLOD[j] )
-				{
-					instance.mLOD[j]->mSkinInfo.mPelvisOffset = mPelvisZOffset;
-				}
-			}
-
-			std::stringstream ostr;
-			LLSD ret = LLModel::writeModel(ostr,
-					   instance.mLOD[4],
-					   instance.mLOD[3],
-					   instance.mLOD[2],
-					   instance.mLOD[1],
-					   instance.mLOD[0],
-					   decomp,
-					   mFMP->childGetValue("upload_skin").asBoolean(),
-					   mFMP->childGetValue("upload_joints").asBoolean(),
-					   mFMP->childGetValue("lock_scale_if_joint_position").asBoolean(),
-					   TRUE,
-					   FALSE,
-					   instance.mModel->mSubmodelID);
-			
-			num_hulls += decomp.mHull.size();
-			for (U32 i = 0; i < decomp.mHull.size(); ++i)
-			{
-				num_points += decomp.mHull[i].size();
-			}
-
-			//calculate streaming cost
-			LLMatrix4 transformation = instance.mTransform;
-
-			LLVector3 position = LLVector3(0, 0, 0) * transformation;
-
-			LLVector3 x_transformed = LLVector3(1, 0, 0) * transformation - position;
-			LLVector3 y_transformed = LLVector3(0, 1, 0) * transformation - position;
-			LLVector3 z_transformed = LLVector3(0, 0, 1) * transformation - position;
-			F32 x_length = x_transformed.normalize();
-			F32 y_length = y_transformed.normalize();
-			F32 z_length = z_transformed.normalize();
-			LLVector3 scale = LLVector3(x_length, y_length, z_length);
-
-			F32 radius = scale.length()*0.5f*debug_scale;
-
-            LLMeshCostData costs;
-            if (gMeshRepo.getCostData(ret, costs))
-            {
-                streaming_cost += costs.getRadiusBasedStreamingCost(radius);
-            }
-		}
-	}
-
-	F32 scale = mFMP ? mFMP->childGetValue("import_scale").asReal()*2.f : 2.f;
-
-	mDetailsSignal(mPreviewScale[0]*scale, mPreviewScale[1]*scale, mPreviewScale[2]*scale, streaming_cost, physics_cost);
-
-	updateStatusMessages();
-
-	return (U32) streaming_cost;
-}
-
 void LLFloaterModelPreview::setDetails(F32 x, F32 y, F32 z, F32 streaming_cost, F32 physics_cost)
 {
 	assert_main_thread();
@@ -1795,3129 +1461,6 @@ void LLFloaterModelPreview::setPreviewLOD(S32 lod)
 	}
 }
 
-
-void LLModelPreview::rebuildUploadData()
-{
-	assert_main_thread();
-
-	mUploadData.clear();
-	mTextureSet.clear();
-
-	//fill uploaddata instance vectors from scene data
-
-	std::string requested_name = mFMP->getChild<LLUICtrl>("description_form")->getValue().asString();
-
-	LLSpinCtrl* scale_spinner = mFMP->getChild<LLSpinCtrl>("import_scale");
-
-	F32 scale = scale_spinner->getValue().asReal();
-
-	LLMatrix4 scale_mat;
-	scale_mat.initScale(LLVector3(scale, scale, scale));
-
-	F32 max_scale = 0.f;
-
-	BOOL legacyMatching = gSavedSettings.getBOOL("ImporterLegacyMatching");
-
-	for (LLModelLoader::scene::iterator iter = mBaseScene.begin(); iter != mBaseScene.end(); ++iter)
-	{ //for each transform in scene
-		LLMatrix4 mat		= iter->first;
-
-		// compute position
-		LLVector3 position = LLVector3(0, 0, 0) * mat;
-
-		// compute scale
-		LLVector3 x_transformed = LLVector3(1, 0, 0) * mat - position;
-		LLVector3 y_transformed = LLVector3(0, 1, 0) * mat - position;
-		LLVector3 z_transformed = LLVector3(0, 0, 1) * mat - position;
-		F32 x_length = x_transformed.normalize();
-		F32 y_length = y_transformed.normalize();
-		F32 z_length = z_transformed.normalize();
-
-		max_scale = llmax(llmax(llmax(max_scale, x_length), y_length), z_length);
-
-		mat *= scale_mat;
-
-		for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end();)
-		{ //for each instance with said transform applied 
-			LLModelInstance instance = *model_iter++;
-
-			LLModel* base_model = instance.mModel;
-			
-			if (base_model && !requested_name.empty())
-			{
-				base_model->mRequestedLabel = requested_name;
-			}
-
-			for (int i = LLModel::NUM_LODS - 1; i >= LLModel::LOD_IMPOSTOR; i--)
-			{
-				LLModel* lod_model = NULL;
-				if (!legacyMatching)
-				{
-					// Fill LOD slots by finding matching meshes by label with name extensions
-					// in the appropriate scene for each LOD. This fixes all kinds of issues
-					// where the indexed method below fails in spectacular fashion.
-					// If you don't take the time to name your LOD and PHYS meshes
-					// with the name of their corresponding mesh in the HIGH LOD,
-					// then the indexed method will be attempted below.
-
-					LLMatrix4 transform;
-
-					std::string name_to_match = instance.mLabel;
-					llassert(!name_to_match.empty());
-
-					int extensionLOD;
-					if (i != LLModel::LOD_PHYSICS || mModel[LLModel::LOD_PHYSICS].empty())
-					{
-						extensionLOD = i;
-					}
-					else
-					{
-						//Physics can be inherited from other LODs or loaded, so we need to adjust what extension we are searching for
-						extensionLOD = mPhysicsSearchLOD;
-					}
-
-					std::string toAdd;
-					switch (extensionLOD)
-					{
-					case LLModel::LOD_IMPOSTOR: toAdd = "_LOD0"; break;
-					case LLModel::LOD_LOW:      toAdd = "_LOD1"; break;
-					case LLModel::LOD_MEDIUM:   toAdd = "_LOD2"; break;
-					case LLModel::LOD_PHYSICS:  toAdd = "_PHYS"; break;
-					case LLModel::LOD_HIGH:                      break;
-					}
-
-					if (name_to_match.find(toAdd) == -1)
-					{
-						name_to_match += toAdd;
-					}
-
-					FindModel(mScene[i], name_to_match, lod_model, transform);
-
-					if (!lod_model && i != LLModel::LOD_PHYSICS)
-					{
-						if (mImporterDebug)
-                        {
-                            std::ostringstream out;
-                            out << "Search of" << name_to_match;
-                            out << " in LOD" << i;
-                            out << " list failed. Searching for alternative among LOD lists.";
-                            LL_INFOS() << out.str() << LL_ENDL;
-                            LLFloaterModelPreview::addStringToLog(out, false);
-						}
-
-						int searchLOD = (i > LLModel::LOD_HIGH) ? LLModel::LOD_HIGH : i;
-						while ((searchLOD <= LLModel::LOD_HIGH) && !lod_model)
-						{
-							std::string name_to_match = instance.mLabel;
-							llassert(!name_to_match.empty());
-
-							std::string toAdd;
-							switch (searchLOD)
-							{
-							case LLModel::LOD_IMPOSTOR: toAdd = "_LOD0"; break;
-							case LLModel::LOD_LOW:      toAdd = "_LOD1"; break;
-							case LLModel::LOD_MEDIUM:   toAdd = "_LOD2"; break;
-							case LLModel::LOD_PHYSICS:  toAdd = "_PHYS"; break;
-							case LLModel::LOD_HIGH:                      break;
-							}
-
-							if (name_to_match.find(toAdd) == -1)
-							{
-								name_to_match += toAdd;
-							}
-
-							// See if we can find an appropriately named model in LOD 'searchLOD'
-							//
-							FindModel(mScene[searchLOD], name_to_match, lod_model, transform);
-							searchLOD++;
-						}
-					}
-				}
-				else
-				{
-					// Use old method of index-based association
-					U32 idx = 0;
-					for (idx = 0; idx < mBaseModel.size(); ++idx)
-					{
-						// find reference instance for this model
-						if (mBaseModel[idx] == base_model)
-						{
-							if (mImporterDebug)
-							{
-                                std::ostringstream out;
-                                out << "Attempting to use model index " << idx;
-                                out << " for LOD" << i;
-                                out << " of " << instance.mLabel;
-                                LL_INFOS() << out.str() << LL_ENDL;
-                                LLFloaterModelPreview::addStringToLog(out, false);
-							}
-							break;
-						}
-					}
-
-					// If the model list for the current LOD includes that index...
-					//
-					if (mModel[i].size() > idx)
-					{
-						// Assign that index from the model list for our LOD as the LOD model for this instance
-						//
-						lod_model = mModel[i][idx];
-						if (mImporterDebug)
-                        {
-                            std::ostringstream out;
-                            out << "Indexed match of model index " << idx << " at LOD " << i << " to model named " << lod_model->mLabel;
-                            LL_INFOS() << out.str() << LL_ENDL;
-                            LLFloaterModelPreview::addStringToLog(out, false);
-						}
-					}
-					else if (mImporterDebug)
-					{
-                        std::ostringstream out;
-                        out << "List of models does not include index " << idx;
-                        LL_INFOS() << out.str() << LL_ENDL;
-                        LLFloaterModelPreview::addStringToLog(out, false);
-					}
-				}
-
-				if (lod_model)
-				{
-					if (mImporterDebug)
-                    {
-                        std::ostringstream out;
-						if (i == LLModel::LOD_PHYSICS)
-                        {
-                            out << "Assigning collision for " << instance.mLabel << " to match " << lod_model->mLabel;
-						}
-						else
-                        {
-                            out << "Assigning LOD" << i << " for " << instance.mLabel << " to found match " << lod_model->mLabel;
-                        }
-                        LL_INFOS() << out.str() << LL_ENDL;
-                        LLFloaterModelPreview::addStringToLog(out, false);
-					}
-					instance.mLOD[i] = lod_model;
-				}
-				else
-				{
-					if (i < LLModel::LOD_HIGH && !lodsReady())
-					{
-						// assign a placeholder from previous LOD until lod generation is complete.
-						// Note: we might need to assign it regardless of conditions like named search does, to prevent crashes.
-						instance.mLOD[i] = instance.mLOD[i + 1];
-					}
-					if (mImporterDebug)
-					{
-                        std::ostringstream out;
-                        out << "List of models does not include " << instance.mLabel;
-                        LL_INFOS() << out.str() << LL_ENDL;
-                        LLFloaterModelPreview::addStringToLog(out, false);
-					}
-				}
-			}
-
-			LLModel* high_lod_model = instance.mLOD[LLModel::LOD_HIGH];
-			if (!high_lod_model)
-			{
-				setLoadState( LLModelLoader::ERROR_MATERIALS );
-				mFMP->childDisable( "calculate_btn" );
-			}
-			else
-			{
-				for (U32 i = 0; i < LLModel::NUM_LODS-1; i++)
-				{				
-					int refFaceCnt = 0;
-					int modelFaceCnt = 0;
-					llassert(instance.mLOD[i]);
-					if (instance.mLOD[i] && !instance.mLOD[i]->matchMaterialOrder(high_lod_model, refFaceCnt, modelFaceCnt ) )
-					{
-						setLoadState( LLModelLoader::ERROR_MATERIALS );
-						mFMP->childDisable( "calculate_btn" );
-					}
-				}
-                LLFloaterModelPreview* fmp = (LLFloaterModelPreview*) mFMP;
-                bool upload_skinweights = fmp && fmp->childGetValue("upload_skin").asBoolean();
-                if (upload_skinweights && high_lod_model->mSkinInfo.mJointNames.size() > 0)
-                {
-                    LLQuaternion bind_rot = LLSkinningUtil::getUnscaledQuaternion(high_lod_model->mSkinInfo.mBindShapeMatrix);
-                    LLQuaternion identity;
-                    if (!bind_rot.isEqualEps(identity,0.01))
-                    {
-                        std::ostringstream out;
-                        out << "non-identity bind shape rot. mat is ";
-                        out << high_lod_model->mSkinInfo.mBindShapeMatrix;
-                        out << " bind_rot ";
-                        out << bind_rot;
-                        LL_WARNS() << out.str() << LL_ENDL;
-
-                        LLFloaterModelPreview::addStringToLog(out, false);
-                        setLoadState( LLModelLoader::WARNING_BIND_SHAPE_ORIENTATION );
-                    }
-                }
-			}
-			instance.mTransform = mat;
-			mUploadData.push_back(instance);
-		}
-	}
-
-	for (U32 lod = 0; lod < LLModel::NUM_LODS-1; lod++)
-	{
-		// Search for models that are not included into upload data
-		// If we found any, that means something we loaded is not a sub-model.
-		for (U32 model_ind = 0; model_ind < mModel[lod].size(); ++model_ind)
-		{
-			bool found_model = false;
-			for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
-			{
-				LLModelInstance& instance = *iter;
-				if (instance.mLOD[lod] == mModel[lod][model_ind])
-				{
-					found_model = true;
-					break;
-				}
-			}
-			if (!found_model && mModel[lod][model_ind] && !mModel[lod][model_ind]->mSubmodelID)
-			{
-				if (mImporterDebug)
-                {
-                    std::ostringstream out;
-                    out << "Model " << mModel[lod][model_ind]->mLabel << " was not used - mismatching lod models.";
-                    LL_INFOS() << out.str() << LL_ENDL;
-                    LLFloaterModelPreview::addStringToLog(out, false);
-				}
-				setLoadState( LLModelLoader::ERROR_MATERIALS );
-				mFMP->childDisable( "calculate_btn" );
-			}
-		}
-	}
-
-	F32 max_import_scale = (DEFAULT_MAX_PRIM_SCALE-0.1f)/max_scale;
-
-	F32 max_axis = llmax(mPreviewScale.mV[0], mPreviewScale.mV[1]);
-	max_axis = llmax(max_axis, mPreviewScale.mV[2]);
-	max_axis *= 2.f;
-
-	//clamp scale so that total imported model bounding box is smaller than 240m on a side
-	max_import_scale = llmin(max_import_scale, 240.f/max_axis);
-
-	scale_spinner->setMaxValue(max_import_scale);
-
-	if (max_import_scale < scale)
-	{
-		scale_spinner->setValue(max_import_scale);
-	}
-
-}
-
-void LLModelPreview::saveUploadData(bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position)
-{
-	if (!mLODFile[LLModel::LOD_HIGH].empty())
-	{
-		std::string filename = mLODFile[LLModel::LOD_HIGH];
-        std::string slm_filename;
-
-        if (LLModelLoader::getSLMFilename(filename, slm_filename))
-        {
-			saveUploadData(slm_filename, save_skinweights, save_joint_positions, lock_scale_if_joint_position);
-		}
-	}
-}
-
-void LLModelPreview::saveUploadData(const std::string& filename, 
-                                    bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position)
-{
-
-	std::set<LLPointer<LLModel> > meshes;
-	std::map<LLModel*, std::string> mesh_binary;
-
-	LLModel::hull empty_hull;
-
-	LLSD data;
-
-	data["version"] = SLM_SUPPORTED_VERSION;
-	if (!mBaseModel.empty())
-	{
-		data["name"] = mBaseModel[0]->getName();
-	}
-
-	S32 mesh_id = 0;
-
-	//build list of unique models and initialize local id
-	for (U32 i = 0; i < mUploadData.size(); ++i)
-	{
-		LLModelInstance& instance = mUploadData[i];
-		
-		if (meshes.find(instance.mModel) == meshes.end())
-		{
-			instance.mModel->mLocalID = mesh_id++;
-			meshes.insert(instance.mModel);
-
-			std::stringstream str;
-			LLModel::Decomposition& decomp =
-				instance.mLOD[LLModel::LOD_PHYSICS].notNull() ? 
-				instance.mLOD[LLModel::LOD_PHYSICS]->mPhysics : 
-				instance.mModel->mPhysics;
-
-			LLModel::writeModel(str, 
-				instance.mLOD[LLModel::LOD_PHYSICS], 
-				instance.mLOD[LLModel::LOD_HIGH], 
-				instance.mLOD[LLModel::LOD_MEDIUM], 
-				instance.mLOD[LLModel::LOD_LOW], 
-				instance.mLOD[LLModel::LOD_IMPOSTOR], 
-				decomp, 
-				save_skinweights, 
-                save_joint_positions,
-                lock_scale_if_joint_position,
-                FALSE, TRUE, instance.mModel->mSubmodelID);
-			
-			data["mesh"][instance.mModel->mLocalID] = str.str();
-		}
-
-		data["instance"][i] = instance.asLLSD();
-	}
-
-	llofstream out(filename.c_str(), std::ios_base::out | std::ios_base::binary);
-	LLSDSerialize::toBinary(data, out);
-	out.flush();
-	out.close();
-}
-
-void LLModelPreview::clearModel(S32 lod)
-{
-	if (lod < 0 || lod > LLModel::LOD_PHYSICS)
-	{
-		return;
-	}
-
-	mVertexBuffer[lod].clear();
-	mModel[lod].clear();
-	mScene[lod].clear();
-}
-
-void LLModelPreview::getJointAliases( JointMap& joint_map)
-{
-    // Get all standard skeleton joints from the preview avatar.
-    LLVOAvatar *av = getPreviewAvatar();
-    
-    //Joint names and aliases come from avatar_skeleton.xml
-    
-    joint_map = av->getJointAliases();
-
-    std::vector<std::string> cv_names, attach_names;
-    av->getSortedJointNames(1, cv_names);
-    av->getSortedJointNames(2, attach_names);
-    for (std::vector<std::string>::iterator it = cv_names.begin(); it != cv_names.end(); ++it)
-    {
-        joint_map[*it] = *it;
-    }
-    for (std::vector<std::string>::iterator it = attach_names.begin(); it != attach_names.end(); ++it)
-    {
-        joint_map[*it] = *it;
-    }
-}
-
-void LLModelPreview::loadModel(std::string filename, S32 lod, bool force_disable_slm)
-{
-	assert_main_thread();
-
-	LLMutexLock lock(this);
-
-	if (lod < LLModel::LOD_IMPOSTOR || lod > LLModel::NUM_LODS - 1)
-	{
-		std::ostringstream out;
-		out << "Invalid level of detail: ";
-		out << lod;
-		LL_WARNS() << out.str() << LL_ENDL;
-		LLFloaterModelPreview::addStringToLog(out, true);
-		assert(lod >= LLModel::LOD_IMPOSTOR && lod < LLModel::NUM_LODS);
-		return;
-	}
-
-	// This triggers if you bring up the file picker and then hit CANCEL.
-	// Just use the previous model (if any) and ignore that you brought up
-	// the file picker.
-
-	if (filename.empty())
-	{
-		if (mBaseModel.empty())
-		{
-			// this is the initial file picking. Close the whole floater
-			// if we don't have a base model to show for high LOD.
-			mFMP->closeFloater(false);
-		}
-		mLoading = false;
-		return;
-	}
-
-	if (mModelLoader)
-	{
-		LL_WARNS() << "Incompleted model load operation pending." << LL_ENDL;
-		return;
-	}
-	
-	mLODFile[lod] = filename;
-
-	if (lod == LLModel::LOD_HIGH)
-	{
-		clearGLODGroup();
-	}
-
-    std::map<std::string, std::string> joint_alias_map;
-    getJointAliases(joint_alias_map);
-    
-	mModelLoader = new LLDAELoader(
-		filename,
-		lod, 
-		&LLModelPreview::loadedCallback,
-		&LLModelPreview::lookupJointByName,
-		&LLModelPreview::loadTextures,
-		&LLModelPreview::stateChangedCallback,
-		this,
-		mJointTransformMap,
-		mJointsFromNode,
-        joint_alias_map,
-		LLSkinningUtil::getMaxJointCount(),
-		gSavedSettings.getU32("ImporterModelLimit"),
-		gSavedSettings.getBOOL("ImporterPreprocessDAE"));
-
-	if (force_disable_slm)
-	{
-		mModelLoader->mTrySLM = false;
-	}
-	else
-	{
-        // For MAINT-6647, we have set force_disable_slm to true,
-        // which means this code path will never be taken. Trying to
-        // re-use SLM files has never worked properly; in particular,
-        // it tends to force the UI into strange checkbox options
-        // which cannot be altered.
-        
-		//only try to load from slm if viewer is configured to do so and this is the 
-		//initial model load (not an LoD or physics shape)
-		mModelLoader->mTrySLM = gSavedSettings.getBOOL("MeshImportUseSLM") && mUploadData.empty();
-	}
-	mModelLoader->start();
-
-	mFMP->childSetTextArg("status", "[STATUS]", mFMP->getString("status_reading_file"));
-
-	setPreviewLOD(lod);
-
-	if ( getLoadState() >= LLModelLoader::ERROR_PARSING )
-	{
-		mFMP->childDisable("ok_btn");
-		mFMP->childDisable( "calculate_btn" );
-	}
-	
-	if (lod == mPreviewLOD)
-	{
-		mFMP->childSetValue("lod_file_" + lod_name[lod], mLODFile[lod]);
-	}
-	else if (lod == LLModel::LOD_PHYSICS)
-	{
-		mFMP->childSetValue("physics_file", mLODFile[lod]);
-	}
-
-	mFMP->openFloater();
-}
-
-void LLModelPreview::setPhysicsFromLOD(S32 lod)
-{
-	assert_main_thread();
-
-	if (lod >= 0 && lod <= 3)
-	{
-		mPhysicsSearchLOD = lod;
-		mModel[LLModel::LOD_PHYSICS] = mModel[lod];
-		mScene[LLModel::LOD_PHYSICS] = mScene[lod];
-		mLODFile[LLModel::LOD_PHYSICS].clear();
-		mFMP->childSetValue("physics_file", mLODFile[LLModel::LOD_PHYSICS]);
-		mVertexBuffer[LLModel::LOD_PHYSICS].clear();
-		rebuildUploadData();
-		refresh();
-		updateStatusMessages();
-	}
-}
-
-void LLModelPreview::clearIncompatible(S32 lod)
-{
-	//Don't discard models if specified model is the physic rep
-	if ( lod == LLModel::LOD_PHYSICS )
-	{
-		return;
-	}
-
-	// at this point we don't care about sub-models,
-	// different amount of sub-models means face count mismatch, not incompatibility
-	U32 lod_size = countRootModels(mModel[lod]);
-	for (U32 i = 0; i <= LLModel::LOD_HIGH; i++)
-	{ //clear out any entries that aren't compatible with this model
-		if (i != lod)
-		{
-			if (countRootModels(mModel[i]) != lod_size)
-			{
-				mModel[i].clear();
-				mScene[i].clear();
-				mVertexBuffer[i].clear();
-
-				if (i == LLModel::LOD_HIGH)
-				{
-					mBaseModel = mModel[lod];
-					clearGLODGroup();
-					mBaseScene = mScene[lod];
-					mVertexBuffer[5].clear();
-				}
-			}
-		}
-	}
-}
-
-void LLModelPreview::clearGLODGroup()
-{
-	if (mGroup)
-	{
-		for (std::map<LLPointer<LLModel>, U32>::iterator iter = mObject.begin(); iter != mObject.end(); ++iter)
-		{
-			glodDeleteObject(iter->second);
-			stop_gloderror();
-		}
-		mObject.clear();
-
-		glodDeleteGroup(mGroup);
-		stop_gloderror();
-		mGroup = 0;
-	}
-}
-
-void LLModelPreview::loadModelCallback(S32 loaded_lod)
-{
-	assert_main_thread();
-
-	LLMutexLock lock(this);
-	if (!mModelLoader)
-	{
-		mLoading = false ;
-		return;
-	}
-	if(getLoadState() >= LLModelLoader::ERROR_PARSING)
-	{
-		mLoading = false ;
-		mModelLoader = NULL;
-		mLodsWithParsingError.push_back(loaded_lod);
-		return ;
-	}
-
-	mLodsWithParsingError.erase(std::remove(mLodsWithParsingError.begin(), mLodsWithParsingError.end(), loaded_lod), mLodsWithParsingError.end());
-	if(mLodsWithParsingError.empty())
-	{
-		mFMP->childEnable( "calculate_btn" );
-	}
-
-	// Copy determinations about rig so UI will reflect them
-	//
-	setRigValidForJointPositionUpload(mModelLoader->isRigValidForJointPositionUpload());
-	setLegacyRigFlags(mModelLoader->getLegacyRigFlags());
-
-	mModelLoader->loadTextures() ;
-
-	if (loaded_lod == -1)
-	{ //populate all LoDs from model loader scene
-		mBaseModel.clear();
-		mBaseScene.clear();
-
-		bool skin_weights = false;
-		bool joint_overrides = false;
-		bool lock_scale_if_joint_position = false;
-
-		for (S32 lod = 0; lod < LLModel::NUM_LODS; ++lod)
-		{ //for each LoD
-
-			//clear scene and model info
-			mScene[lod].clear();
-			mModel[lod].clear();
-			mVertexBuffer[lod].clear();
-			
-			if (mModelLoader->mScene.begin()->second[0].mLOD[lod].notNull())
-			{ //if this LoD exists in the loaded scene
-
-				//copy scene to current LoD
-				mScene[lod] = mModelLoader->mScene;
-			
-				//touch up copied scene to look like current LoD
-				for (LLModelLoader::scene::iterator iter = mScene[lod].begin(); iter != mScene[lod].end(); ++iter)
-				{
-					LLModelLoader::model_instance_list& list = iter->second;
-
-					for (LLModelLoader::model_instance_list::iterator list_iter = list.begin(); list_iter != list.end(); ++list_iter)
-					{	
-						//override displayed model with current LoD
-						list_iter->mModel = list_iter->mLOD[lod];
-
-						if (!list_iter->mModel)
-						{
-							continue;
-						}
-
-						//add current model to current LoD's model list (LLModel::mLocalID makes a good vector index)
-						S32 idx = list_iter->mModel->mLocalID;
-
-						if (mModel[lod].size() <= idx)
-						{ //stretch model list to fit model at given index
-							mModel[lod].resize(idx+1);
-						}
-
-						mModel[lod][idx] = list_iter->mModel;
-						if (!list_iter->mModel->mSkinWeights.empty())
-						{
-							skin_weights = true;
-
-							if (!list_iter->mModel->mSkinInfo.mAlternateBindMatrix.empty())
-							{
-								joint_overrides = true;
-							}
-							if (list_iter->mModel->mSkinInfo.mLockScaleIfJointPosition)
-							{
-								lock_scale_if_joint_position = true;
-							}
-						}
-					}
-				}
-			}
-		}
-
-		if (mFMP)
-		{
-			LLFloaterModelPreview* fmp = (LLFloaterModelPreview*) mFMP;
-
-			if (skin_weights)
-			{ //enable uploading/previewing of skin weights if present in .slm file
-				fmp->enableViewOption("show_skin_weight");
-				mViewOption["show_skin_weight"] = true;
-				fmp->childSetValue("upload_skin", true);
-			}
-
-			if (joint_overrides)
-			{
-				fmp->enableViewOption("show_joint_overrides");
-				mViewOption["show_joint_overrides"] = true;
-				fmp->enableViewOption("show_joint_positions");
-				mViewOption["show_joint_positions"] = true;
-				fmp->childSetValue("upload_joints", true);
-			}
-            else
-            {
-                fmp->clearAvatarTab();
-            }
-
-			if (lock_scale_if_joint_position)
-			{
-				fmp->enableViewOption("lock_scale_if_joint_position");
-				mViewOption["lock_scale_if_joint_position"] = true;
-				fmp->childSetValue("lock_scale_if_joint_position", true);
-			}
-		}
-
-		//copy high lod to base scene for LoD generation
-		mBaseScene = mScene[LLModel::LOD_HIGH];
-		mBaseModel = mModel[LLModel::LOD_HIGH];
-
-		mDirty = true;
-		resetPreviewTarget();
-	}
-	else
-	{ //only replace given LoD
-		mModel[loaded_lod] = mModelLoader->mModelList;
-		mScene[loaded_lod] = mModelLoader->mScene;
-		mVertexBuffer[loaded_lod].clear();
-
-		setPreviewLOD(loaded_lod);
-
-		if (loaded_lod == LLModel::LOD_HIGH)
-		{ //save a copy of the highest LOD for automatic LOD manipulation
-			if (mBaseModel.empty())
-			{ //first time we've loaded a model, auto-gen LoD
-				mGenLOD = true;
-			}
-
-			mBaseModel = mModel[loaded_lod];
-			clearGLODGroup();
-
-			mBaseScene = mScene[loaded_lod];
-			mVertexBuffer[5].clear();
-		}
-		else
-		{
-			BOOL legacyMatching = gSavedSettings.getBOOL("ImporterLegacyMatching");
-			if (!legacyMatching)
-			{
-				if (!mBaseModel.empty())
-				{ 
-					BOOL name_based = FALSE;
-					BOOL has_submodels = FALSE;
-					for (U32 idx = 0; idx < mBaseModel.size(); ++idx)
-					{
-						if (mBaseModel[idx]->mSubmodelID)
-						{ // don't do index-based renaming when the base model has submodels
-							has_submodels = TRUE;
-							if (mImporterDebug)
-							{
-                                std::ostringstream out;
-                                out << "High LOD has submodels";
-                                LL_INFOS() << out.str() << LL_ENDL;
-                                LLFloaterModelPreview::addStringToLog(out, false);
-							}
-							break;
-						}
-					}
-
-					for (U32 idx = 0; idx < mModel[loaded_lod].size(); ++idx)
-					{
-						std::string loaded_name = stripSuffix(mModel[loaded_lod][idx]->mLabel);
-
-						LLModel* found_model = NULL;
-						LLMatrix4 transform;
-						FindModel(mBaseScene, loaded_name, found_model, transform);
-						if (found_model)
-						{ // don't rename correctly named models (even if they are placed in a wrong order)
-							name_based = TRUE;
-						}
-
-						if (mModel[loaded_lod][idx]->mSubmodelID)
-						{ // don't rename the models when loaded LOD model has submodels
-							has_submodels = TRUE;
-						}
-					}
-
-					if (mImporterDebug)
-					{
-                        std::ostringstream out;
-                        out << "Loaded LOD " << loaded_lod << ": correct names" << (name_based ? "" : "NOT ") << "found; submodels " << (has_submodels ? "" : "NOT ") << "found";
-                        LL_INFOS() << out.str() << LL_ENDL;
-                        LLFloaterModelPreview::addStringToLog(out, false);
-					}
-
-					if (!name_based && !has_submodels)
-					{ // replace the name of the model loaded for any non-HIGH LOD to match the others (MAINT-5601)
-					  // this actually works like "ImporterLegacyMatching" for this particular LOD
-						for (U32 idx = 0; idx < mModel[loaded_lod].size() && idx < mBaseModel.size(); ++idx)
-						{ 
-							std::string name = mBaseModel[idx]->mLabel;
-							std::string loaded_name = stripSuffix(mModel[loaded_lod][idx]->mLabel);
-
-							if (loaded_name != name)
-							{
-								switch (loaded_lod)
-								{
-								case LLModel::LOD_IMPOSTOR: name += "_LOD0"; break;
-								case LLModel::LOD_LOW:      name += "_LOD1"; break;
-								case LLModel::LOD_MEDIUM:   name += "_LOD2"; break;
-								case LLModel::LOD_PHYSICS:  name += "_PHYS"; break;
-								case LLModel::LOD_HIGH:                      break;
-								}
-
-								if (mImporterDebug)
-								{
-									std::ostringstream out;
-									out << "Loded model name " << mModel[loaded_lod][idx]->mLabel;
-									out << " for LOD " << loaded_lod;
-									out << " doesn't match the base model. Renaming to " << name;
-									LL_WARNS() << out.str() << LL_ENDL;
-									LLFloaterModelPreview::addStringToLog(out, false);
-								}
-
-								mModel[loaded_lod][idx]->mLabel = name;
-							}
-						}
-					}
-				}
-			}
-		}
-
-		clearIncompatible(loaded_lod);
-
-		mDirty = true;
-
-		if (loaded_lod == LLModel::LOD_HIGH)
-		{
-			resetPreviewTarget();
-		}
-	}
-
-	mLoading = false;
-	if (mFMP)
-	{
-		if (!mBaseModel.empty())
-		{
-			const std::string& model_name = mBaseModel[0]->getName();
-			LLLineEditor* description_form = mFMP->getChild<LLLineEditor>("description_form");
-			if (description_form->getText().empty())
-			{
-				description_form->setText(model_name);
-			}
-            // Add info to log that loading is complete (purpose: separator between loading and other logs)
-            LLSD args;
-            args["MODEL_NAME"] = model_name; // Teoretically shouldn't be empty, but might be better idea to add filename here
-            LLFloaterModelPreview::addStringToLog("ModelLoaded", args, false, loaded_lod);
-		}
-	}
-	refresh();
-
-	mModelLoadedSignal();
-
-	mModelLoader = NULL;
-}
-
-void LLModelPreview::resetPreviewTarget()
-{
-	if ( mModelLoader )
-	{
-		mPreviewTarget = (mModelLoader->mExtents[0] + mModelLoader->mExtents[1]) * 0.5f;
-		mPreviewScale = (mModelLoader->mExtents[1] - mModelLoader->mExtents[0]) * 0.5f;
-	}
-
-	setPreviewTarget(mPreviewScale.magVec()*10.f);
-}
-
-void LLModelPreview::generateNormals()
-{
-	assert_main_thread();
-
-	S32 which_lod = mPreviewLOD;
-
-	if (which_lod > 4 || which_lod < 0 ||
-		mModel[which_lod].empty())
-	{
-		return;
-	}
-
-	F32 angle_cutoff = mFMP->childGetValue("crease_angle").asReal();
-
-	mRequestedCreaseAngle[which_lod] = angle_cutoff;
-
-	angle_cutoff *= DEG_TO_RAD;
-
-	if (which_lod == 3 && !mBaseModel.empty())
-	{
-		if(mBaseModelFacesCopy.empty())
-		{
-			mBaseModelFacesCopy.reserve(mBaseModel.size());
-			for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it)
-			{
-				v_LLVolumeFace_t faces;
-				(*it)->copyFacesTo(faces);
-				mBaseModelFacesCopy.push_back(faces);
-			}
-		}
-
-		for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it)
-		{
-			(*it)->generateNormals(angle_cutoff);
-		}
-
-		mVertexBuffer[5].clear();
-	}
-
-	bool perform_copy = mModelFacesCopy[which_lod].empty();
-	if(perform_copy) {
-		mModelFacesCopy[which_lod].reserve(mModel[which_lod].size());
-	}
-
-	for (LLModelLoader::model_list::iterator it = mModel[which_lod].begin(), itE = mModel[which_lod].end(); it != itE; ++it)
-	{
-		if(perform_copy)
-		{
-			v_LLVolumeFace_t faces;
-			(*it)->copyFacesTo(faces);
-			mModelFacesCopy[which_lod].push_back(faces);
-		}
-
-		(*it)->generateNormals(angle_cutoff);
-	}
-
-	mVertexBuffer[which_lod].clear();
-	refresh();
-	updateStatusMessages();
-}
-
-void LLModelPreview::restoreNormals()
-{
-	S32 which_lod = mPreviewLOD;
-
-	if (which_lod > 4 || which_lod < 0 ||
-		mModel[which_lod].empty())
-	{
-		return;
-	}
-
-	if(!mBaseModelFacesCopy.empty())
-	{
-		llassert(mBaseModelFacesCopy.size() == mBaseModel.size());
-
-		vv_LLVolumeFace_t::const_iterator itF = mBaseModelFacesCopy.begin();
-		for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it, ++itF)
-		{
-			(*it)->copyFacesFrom((*itF));
-		}
-
-		mBaseModelFacesCopy.clear();
-	}
-	
-	if(!mModelFacesCopy[which_lod].empty())
-	{
-		vv_LLVolumeFace_t::const_iterator itF = mModelFacesCopy[which_lod].begin();
-		for (LLModelLoader::model_list::iterator it = mModel[which_lod].begin(), itE = mModel[which_lod].end(); it != itE; ++it, ++itF)
-		{
-			(*it)->copyFacesFrom((*itF));
-		}
-
-		mModelFacesCopy[which_lod].clear();
-	}
-	
-	mVertexBuffer[which_lod].clear();
-	refresh();
-	updateStatusMessages();
-}
-
-void LLModelPreview::genLODs(S32 which_lod, U32 decimation, bool enforce_tri_limit)
-{
-	// Allow LoD from -1 to LLModel::LOD_PHYSICS
-	if (which_lod < -1 || which_lod > LLModel::NUM_LODS - 1)
-	{
-		std::ostringstream out;
-		out << "Invalid level of detail: " << which_lod;
-		LL_WARNS() << out.str() << LL_ENDL;
-		LLFloaterModelPreview::addStringToLog(out, false);
-		assert(which_lod >= -1 && which_lod < LLModel::NUM_LODS);
-		return;
-	}
-
-	if (mBaseModel.empty())
-	{
-		return;
-	}
-
-	LLVertexBuffer::unbind();
-
-	bool no_ff = LLGLSLShader::sNoFixedFunction;
-	LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
-	LLGLSLShader::sNoFixedFunction = false;
-
-	if (shader)
-	{
-		shader->unbind();
-	}
-	
-	stop_gloderror();
-	static U32 cur_name = 1;
-
-	S32 limit = -1;
-
-	U32 triangle_count = 0;
-
-	U32 instanced_triangle_count = 0;
-
-	//get the triangle count for the whole scene
-	for (LLModelLoader::scene::iterator iter = mBaseScene.begin(), endIter = mBaseScene.end(); iter != endIter; ++iter)
-	{
-		for (LLModelLoader::model_instance_list::iterator instance = iter->second.begin(), end_instance = iter->second.end(); instance != end_instance; ++instance)
-		{
-			LLModel* mdl = instance->mModel;
-			if (mdl)
-			{
-				instanced_triangle_count += mdl->getNumTriangles();
-			}
-		}
-	}
-
-	//get the triangle count for the non-instanced set of models
-	for (U32 i = 0; i < mBaseModel.size(); ++i)
-	{
-		triangle_count += mBaseModel[i]->getNumTriangles();
-	}
-	
-	//get ratio of uninstanced triangles to instanced triangles
-	F32 triangle_ratio = (F32) triangle_count / (F32) instanced_triangle_count;
-
-	U32 base_triangle_count = triangle_count;
-
-	U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
-
-	U32 lod_mode = 0;
-
-	F32 lod_error_threshold = 0;
-
-	// The LoD should be in range from Lowest to High
-	if (which_lod > -1 && which_lod < NUM_LOD)
-	{
-		LLCtrlSelectionInterface* iface = mFMP->childGetSelectionInterface("lod_mode_" + lod_name[which_lod]);
-		if (iface)
-		{
-			lod_mode = iface->getFirstSelectedIndex();
-		}
-
-		lod_error_threshold = mFMP->childGetValue("lod_error_threshold_" + lod_name[which_lod]).asReal();
-	}
-
-	if (which_lod != -1)
-	{
-		mRequestedLoDMode[which_lod] = lod_mode;
-	}
-
-	if (lod_mode == 0)
-	{
-		lod_mode = GLOD_TRIANGLE_BUDGET;
-
-		// The LoD should be in range from Lowest to High
-		if (which_lod > -1 && which_lod < NUM_LOD)
-		{
-			limit = mFMP->childGetValue("lod_triangle_limit_" + lod_name[which_lod]).asInteger();
-			//convert from "scene wide" to "non-instanced" triangle limit
-			limit = (S32) ( (F32) limit*triangle_ratio );
-		}
-	}
-	else
-	{
-		lod_mode = GLOD_ERROR_THRESHOLD;
-	}
-
-	bool object_dirty = false;
-
-	if (mGroup == 0)
-	{
-		object_dirty = true;
-		mGroup = cur_name++;
-		glodNewGroup(mGroup);
-	}
-
-	if (object_dirty)
-	{
-		for (LLModelLoader::model_list::iterator iter = mBaseModel.begin(); iter != mBaseModel.end(); ++iter)
-		{ //build GLOD objects for each model in base model list
-			LLModel* mdl = *iter;
-
-			if (mObject[mdl] != 0)
-			{
-				glodDeleteObject(mObject[mdl]);
-			}
-
-			mObject[mdl] = cur_name++;
-
-			glodNewObject(mObject[mdl], mGroup, GLOD_DISCRETE);
-			stop_gloderror();
-
-			if (iter == mBaseModel.begin() && !mdl->mSkinWeights.empty())
-			{ //regenerate vertex buffer for skinned models to prevent animation feedback during LOD generation
-				mVertexBuffer[5].clear();
-			}
-
-			if (mVertexBuffer[5].empty())
-			{
-				genBuffers(5, false);
-			}
-
-			U32 tri_count = 0;
-			for (U32 i = 0; i < mVertexBuffer[5][mdl].size(); ++i)
-			{
-				LLVertexBuffer* buff = mVertexBuffer[5][mdl][i];
-				buff->setBuffer(type_mask & buff->getTypeMask());
-				
-				U32 num_indices = mVertexBuffer[5][mdl][i]->getNumIndices();
-				if (num_indices > 2)
-				{
-					glodInsertElements(mObject[mdl], i, GL_TRIANGLES, num_indices, GL_UNSIGNED_SHORT, (U8*) mVertexBuffer[5][mdl][i]->getIndicesPointer(), 0, 0.f);
-				}
-				tri_count += num_indices/3;
-				stop_gloderror();
-			}
-
-			glodBuildObject(mObject[mdl]);
-			stop_gloderror();
-		}
-	}
-
-
-	S32 start = LLModel::LOD_HIGH;
-	S32 end = 0;
-
-	if (which_lod != -1)
-	{
-		start = end = which_lod;
-	}
-
-	mMaxTriangleLimit = base_triangle_count;
-
-	for (S32 lod = start; lod >= end; --lod)
-	{
-		if (which_lod == -1)
-		{
-			if (lod < start)
-			{
-				triangle_count /= decimation;
-			}
-		}
-		else
-		{
-			if (enforce_tri_limit)
-			{
-				triangle_count = limit;
-			}
-			else
-			{
-				for (S32 j=LLModel::LOD_HIGH; j>which_lod; --j)
-				{
-					triangle_count /= decimation;
-				}
-			}
-		}
-
-		mModel[lod].clear();
-		mModel[lod].resize(mBaseModel.size());
-		mVertexBuffer[lod].clear();
-
-		U32 actual_tris = 0;
-		U32 actual_verts = 0;
-		U32 submeshes = 0;
-
-		mRequestedTriangleCount[lod] = (S32) ( (F32) triangle_count / triangle_ratio );
-		mRequestedErrorThreshold[lod] = lod_error_threshold;
-
-		glodGroupParameteri(mGroup, GLOD_ADAPT_MODE, lod_mode);
-		stop_gloderror();
-
-		glodGroupParameteri(mGroup, GLOD_ERROR_MODE, GLOD_OBJECT_SPACE_ERROR);
-		stop_gloderror();
-
-		glodGroupParameterf(mGroup, GLOD_OBJECT_SPACE_ERROR_THRESHOLD, lod_error_threshold);
-		stop_gloderror();
-
-		if (lod_mode != GLOD_TRIANGLE_BUDGET)
-		{ 			
-			glodGroupParameteri(mGroup, GLOD_MAX_TRIANGLES, 0);
-		}
-		else
-		{
-			//SH-632: always add 1 to desired amount to avoid decimating below desired amount
-			glodGroupParameteri(mGroup, GLOD_MAX_TRIANGLES, triangle_count+1);
-		}
-			
-		stop_gloderror();
-		glodAdaptGroup(mGroup);
-		stop_gloderror();		
-
-		for (U32 mdl_idx = 0; mdl_idx < mBaseModel.size(); ++mdl_idx)
-		{
-			LLModel* base = mBaseModel[mdl_idx];
-
-			GLint patch_count = 0;
-			glodGetObjectParameteriv(mObject[base], GLOD_NUM_PATCHES, &patch_count);
-			stop_gloderror();
-
-			LLVolumeParams volume_params;
-			volume_params.setType(LL_PCODE_PROFILE_SQUARE, LL_PCODE_PATH_LINE);
-			mModel[lod][mdl_idx] = new LLModel(volume_params, 0.f);
-
-            std::string name = base->mLabel;
-
-            switch (lod)
-            {
-                case LLModel::LOD_IMPOSTOR: name += "_LOD0"; break;
-                case LLModel::LOD_LOW:      name += "_LOD1"; break;
-		        case LLModel::LOD_MEDIUM:   name += "_LOD2"; break;
-                case LLModel::LOD_PHYSICS:  name += "_PHYS"; break;
-                case LLModel::LOD_HIGH:                      break;
-            }
-
-            mModel[lod][mdl_idx]->mLabel = name;
-			mModel[lod][mdl_idx]->mSubmodelID = base->mSubmodelID;
-            
-			GLint* sizes = new GLint[patch_count*2];
-			glodGetObjectParameteriv(mObject[base], GLOD_PATCH_SIZES, sizes);
-			stop_gloderror();
-
-			GLint* names = new GLint[patch_count];
-			glodGetObjectParameteriv(mObject[base], GLOD_PATCH_NAMES, names);
-			stop_gloderror();
-
-			mModel[lod][mdl_idx]->setNumVolumeFaces(patch_count);
-
-			LLModel* target_model = mModel[lod][mdl_idx];
-
-			for (GLint i = 0; i < patch_count; ++i)
-			{
-				type_mask = mVertexBuffer[5][base][i]->getTypeMask();
-
-				LLPointer<LLVertexBuffer> buff = new LLVertexBuffer(type_mask, 0);
-
-				if (sizes[i*2+1] > 0 && sizes[i*2] > 0)
-				{
-					if (!buff->allocateBuffer(sizes[i * 2 + 1], sizes[i * 2], true))
-					{
-						// Todo: find a way to stop preview in this case instead of crashing
-						LL_ERRS() << "Failed buffer allocation during preview LOD generation."
-							<< " Vertices: " << sizes[i * 2 + 1]
-							<< " Indices: " << sizes[i * 2] << LL_ENDL;
-					}
-					buff->setBuffer(type_mask);
-					glodFillElements(mObject[base], names[i], GL_UNSIGNED_SHORT, (U8*) buff->getIndicesPointer());
-					stop_gloderror();
-				}
-				else
-				{
-					// This face was eliminated or we failed to allocate buffer,
-					// attempt to create a dummy triangle (one vertex, 3 indices, all 0)
-					buff->allocateBuffer(1, 3, true);
-					memset((U8*) buff->getMappedData(), 0, buff->getSize());
-					memset((U8*) buff->getIndicesPointer(), 0, buff->getIndicesSize());
-				}
-
-				buff->validateRange(0, buff->getNumVerts()-1, buff->getNumIndices(), 0);
-
-				LLStrider<LLVector3> pos;
-				LLStrider<LLVector3> norm;
-				LLStrider<LLVector2> tc;
-				LLStrider<U16> index;
-
-				buff->getVertexStrider(pos);
-				if (type_mask & LLVertexBuffer::MAP_NORMAL)
-				{
-					buff->getNormalStrider(norm);
-				}
-				if (type_mask & LLVertexBuffer::MAP_TEXCOORD0)
-				{
-					buff->getTexCoord0Strider(tc);
-				}
-
-				buff->getIndexStrider(index);
-
-				target_model->setVolumeFaceData(names[i], pos, norm, tc, index, buff->getNumVerts(), buff->getNumIndices());
-				actual_tris += buff->getNumIndices()/3;
-				actual_verts += buff->getNumVerts();
-				++submeshes;
-
-				if (!validate_face(target_model->getVolumeFace(names[i])))
-				{
-					LL_ERRS() << "Invalid face generated during LOD generation." << LL_ENDL;
-				}
-			}
-
-			//blind copy skin weights and just take closest skin weight to point on
-			//decimated mesh for now (auto-generating LODs with skin weights is still a bit
-			//of an open problem).
-			target_model->mPosition = base->mPosition;
-			target_model->mSkinWeights = base->mSkinWeights;
-			target_model->mSkinInfo = base->mSkinInfo;
-			//copy material list
-			target_model->mMaterialList = base->mMaterialList;
-
-			if (!validate_model(target_model))
-			{
-				LL_ERRS() << "Invalid model generated when creating LODs" << LL_ENDL;
-			}
-
-			delete [] sizes;
-			delete [] names;
-		}
-
-		//rebuild scene based on mBaseScene
-		mScene[lod].clear();
-		mScene[lod] = mBaseScene;
-
-		for (U32 i = 0; i < mBaseModel.size(); ++i)
-		{
-			LLModel* mdl = mBaseModel[i];
-			LLModel* target = mModel[lod][i];
-			if (target)
-			{
-				for (LLModelLoader::scene::iterator iter = mScene[lod].begin(); iter != mScene[lod].end(); ++iter)
-				{
-					for (U32 j = 0; j < iter->second.size(); ++j)
-					{
-						if (iter->second[j].mModel == mdl)
-						{
-							iter->second[j].mModel = target;
-						}
-					}
-				}
-			}
-		}
-	}
-
-	mResourceCost = calcResourceCost();
-
-	LLVertexBuffer::unbind();
-	LLGLSLShader::sNoFixedFunction = no_ff;
-	if (shader)
-	{
-		shader->bind();
-	}
-}
-
-void LLModelPreview::updateStatusMessages()
-{
-// bit mask values for physics errors. used to prevent overwrite of single line status
-// TODO: use this to provied multiline status
-	enum PhysicsError
-	{
-		NONE=0,
-		NOHAVOK=1,
-		DEGENERATE=2,
-		TOOMANYHULLS=4,
-		TOOMANYVERTSINHULL=8
-	};
-
-	assert_main_thread();
-
-	U32 has_physics_error{ PhysicsError::NONE }; // physics error bitmap
-	//triangle/vertex/submesh count for each mesh asset for each lod
-	std::vector<S32> tris[LLModel::NUM_LODS];
-	std::vector<S32> verts[LLModel::NUM_LODS];
-	std::vector<S32> submeshes[LLModel::NUM_LODS];
-
-	//total triangle/vertex/submesh count for each lod
-	S32 total_tris[LLModel::NUM_LODS];
-	S32 total_verts[LLModel::NUM_LODS];
-	S32 total_submeshes[LLModel::NUM_LODS];
-
-    for (U32 i = 0; i < LLModel::NUM_LODS-1; i++)
-    {
-        total_tris[i] = 0;
-	    total_verts[i] = 0;
-	    total_submeshes[i] = 0;
-    }
-
-    for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
-	{
-		LLModelInstance& instance = *iter;
-
-        LLModel* model_high_lod = instance.mLOD[LLModel::LOD_HIGH];
-        if (!model_high_lod)
-		{
-			setLoadState( LLModelLoader::ERROR_MATERIALS );
-			mFMP->childDisable( "calculate_btn" );
-			continue;
-		}
-
-        for (U32 i = 0; i < LLModel::NUM_LODS-1; i++)
-		{
-            LLModel* lod_model = instance.mLOD[i];
-            if (!lod_model)
-            {
-                setLoadState( LLModelLoader::ERROR_MATERIALS );
-                mFMP->childDisable( "calculate_btn" );
-            }
-            else
-			{
-					//for each model in the lod
-				S32 cur_tris = 0;
-				S32 cur_verts = 0;
-				S32 cur_submeshes = lod_model->getNumVolumeFaces();
-
-				for (S32 j = 0; j < cur_submeshes; ++j)
-				{ //for each submesh (face), add triangles and vertices to current total
-					const LLVolumeFace& face = lod_model->getVolumeFace(j);
-					cur_tris += face.mNumIndices/3;
-					cur_verts += face.mNumVertices;
-				}
-
-                std::string instance_name = instance.mLabel;
-
-                if (mImporterDebug)
-                {
-                    // Useful for debugging generalized complaints below about total submeshes which don't have enough
-                    // context to address exactly what needs to be fixed to move towards compliance with the rules.
-                    //
-                    std::ostringstream out;
-                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Verts: " << cur_verts;
-                    LL_INFOS() << out.str() << LL_ENDL;
-                    LLFloaterModelPreview::addStringToLog(out, false);
-
-                    out.str("");
-                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Tris:  " << cur_tris;
-                    LL_INFOS() << out.str() << LL_ENDL;
-                    LLFloaterModelPreview::addStringToLog(out, false);
-
-                    out.str("");
-                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Faces: " << cur_submeshes;
-                    LL_INFOS() << out.str() << LL_ENDL;
-                    LLFloaterModelPreview::addStringToLog(out, false);
-
-                    out.str("");
-                    LLModel::material_list::iterator mat_iter = lod_model->mMaterialList.begin();
-                    while (mat_iter != lod_model->mMaterialList.end())
-                    {
-                        out << "Instance " << lod_model->mLabel << " LOD " << i << " Material " << *(mat_iter);
-                        LL_INFOS() << out.str() << LL_ENDL;
-                        LLFloaterModelPreview::addStringToLog(out, false);
-                        out.str("");
-                        mat_iter++;
-                    }
-                }
-
-                //add this model to the lod total
-				total_tris[i] += cur_tris;
-				total_verts[i] += cur_verts;
-				total_submeshes[i] += cur_submeshes;
-
-				//store this model's counts to asset data
-				tris[i].push_back(cur_tris);
-				verts[i].push_back(cur_verts);
-				submeshes[i].push_back(cur_submeshes);
-			}
-		}
-    }
-
-	if (mMaxTriangleLimit == 0)
-	{
-		mMaxTriangleLimit = total_tris[LLModel::LOD_HIGH];
-	}
-
-	mHasDegenerate = false;
-	{//check for degenerate triangles in physics mesh
-		U32 lod = LLModel::LOD_PHYSICS;
-		const LLVector4a scale(0.5f);
-		for (U32 i = 0; i < mModel[lod].size() && !mHasDegenerate; ++i)
-		{ //for each model in the lod
-			if (mModel[lod][i] && mModel[lod][i]->mPhysics.mHull.empty())
-			{ //no decomp exists
-				S32 cur_submeshes = mModel[lod][i]->getNumVolumeFaces();
-				for (S32 j = 0; j < cur_submeshes && !mHasDegenerate; ++j)
-				{ //for each submesh (face), add triangles and vertices to current total
-					LLVolumeFace& face = mModel[lod][i]->getVolumeFace(j);
-					for (S32 k = 0; (k < face.mNumIndices) && !mHasDegenerate; )
-					{
-						U16 index_a = face.mIndices[k + 0];
-						U16 index_b = face.mIndices[k + 1];
-						U16 index_c = face.mIndices[k + 2];
-
-						if (index_c == 0 && index_b == 0 && index_a == 0) // test in reverse as 3rd index is less likely to be 0 in a normal case
-						{
-							LL_DEBUGS("MeshValidation") << "Empty placeholder triangle (3 identical index 0 verts) ignored" << LL_ENDL;
-						}
-						else
-						{
-							LLVector4a v1; v1.setMul(face.mPositions[index_a], scale);
-							LLVector4a v2; v2.setMul(face.mPositions[index_b], scale);
-							LLVector4a v3; v3.setMul(face.mPositions[index_c], scale);
-							if (ll_is_degenerate(v1, v2, v3))
-							{
-								mHasDegenerate = true;
-							}
-						}
-						k += 3;
-					}
-				}
-			}
-		}
-	}
-
-	// flag degenerates here rather than deferring to a MAV error later
-	mFMP->childSetVisible("physics_status_message_text", mHasDegenerate); //display or clear
-	auto degenerateIcon = mFMP->getChild<LLIconCtrl>("physics_status_message_icon");
-	degenerateIcon->setVisible(mHasDegenerate);
-	if (mHasDegenerate)
-	{
-		has_physics_error |= PhysicsError::DEGENERATE;
-		mFMP->childSetValue("physics_status_message_text", mFMP->getString("phys_status_degenerate_triangles"));
-		LLUIImagePtr img = LLUI::getUIImage("ModelImport_Status_Error");
-		degenerateIcon->setImage(img);
-	}
-
-	mFMP->childSetTextArg("submeshes_info", "[SUBMESHES]", llformat("%d", total_submeshes[LLModel::LOD_HIGH]));
-
-	std::string mesh_status_na = mFMP->getString("mesh_status_na");
-
-	S32 upload_status[LLModel::LOD_HIGH+1];
-
-	mModelNoErrors = true;
-
-	const U32 lod_high = LLModel::LOD_HIGH;
-	U32 high_submodel_count = mModel[lod_high].size() - countRootModels(mModel[lod_high]);
-
-	for (S32 lod = 0; lod <= lod_high; ++lod)
-	{
-		upload_status[lod] = 0;
-
-		std::string message = "mesh_status_good";
-
-		if (total_tris[lod] > 0)
-		{
-			mFMP->childSetValue(lod_triangles_name[lod], llformat("%d", total_tris[lod]));
-			mFMP->childSetValue(lod_vertices_name[lod], llformat("%d", total_verts[lod]));
-		}
-		else
-		{
-			if (lod == lod_high)
-			{
-				upload_status[lod] = 2;
-				message = "mesh_status_missing_lod";
-			}
-			else
-			{
-				for (S32 i = lod-1; i >= 0; --i)
-				{
-					if (total_tris[i] > 0)
-					{
-						upload_status[lod] = 2;
-						message = "mesh_status_missing_lod";
-					}
-				}
-			}
-
-			mFMP->childSetValue(lod_triangles_name[lod], mesh_status_na);
-			mFMP->childSetValue(lod_vertices_name[lod], mesh_status_na);
-		}
-
-		if (lod != lod_high)
-		{
-			if (total_submeshes[lod] && total_submeshes[lod] != total_submeshes[lod_high])
-			{ //number of submeshes is different
-				message = "mesh_status_submesh_mismatch";
-				upload_status[lod] = 2;
-			}
-			else if (mModel[lod].size() - countRootModels(mModel[lod]) != high_submodel_count)
-			{//number of submodels is different, not all faces are matched correctly.
-				message = "mesh_status_submesh_mismatch";
-				upload_status[lod] = 2;
-				// Note: Submodels in instance were loaded from higher LOD and as result face count
-				// returns same value and total_submeshes[lod] is identical to high_lod one.
-			}
-			else if (!tris[lod].empty() && tris[lod].size() != tris[lod_high].size())
-			{ //number of meshes is different
-				message = "mesh_status_mesh_mismatch";
-				upload_status[lod] = 2;
-			}
-			else if (!verts[lod].empty())
-			{
-				S32 sum_verts_higher_lod = 0;
-				S32 sum_verts_this_lod = 0;
-				for (U32 i = 0; i < verts[lod].size(); ++i)
-				{
-					sum_verts_higher_lod += ((i < verts[lod+1].size()) ? verts[lod+1][i] : 0);
-					sum_verts_this_lod += verts[lod][i];
-				}
-
-				if ((sum_verts_higher_lod > 0) &&
-					(sum_verts_this_lod > sum_verts_higher_lod))
-				{
-					//too many vertices in this lod
-					message = "mesh_status_too_many_vertices";
-					upload_status[lod] = 1;
-				}
-			}
-		}
-
-		LLIconCtrl* icon = mFMP->getChild<LLIconCtrl>(lod_icon_name[lod]);
-		LLUIImagePtr img = LLUI::getUIImage(lod_status_image[upload_status[lod]]);
-		icon->setVisible(true);
-		icon->setImage(img);
-
-		if (upload_status[lod] >= 2)
-		{
-			mModelNoErrors = false;
-		}
-
-		if (lod == mPreviewLOD)
-		{
-			mFMP->childSetValue("lod_status_message_text", mFMP->getString(message));
-			icon = mFMP->getChild<LLIconCtrl>("lod_status_message_icon");
-			icon->setImage(img);
-		}
-
-		updateLodControls(lod);
-	}
-
-
-	//warn if hulls have more than 256 points in them
-	BOOL physExceededVertexLimit = FALSE;
-	for (U32 i = 0; mModelNoErrors && i < mModel[LLModel::LOD_PHYSICS].size(); ++i)
-	{
-		LLModel* mdl = mModel[LLModel::LOD_PHYSICS][i];
-
-		if (mdl)
-		{
-			for (U32 j = 0; j < mdl->mPhysics.mHull.size(); ++j)
-			{
-				if (mdl->mPhysics.mHull[j].size() > 256)
-				{
-					physExceededVertexLimit = TRUE;
-					LL_INFOS() << "Physical model " << mdl->mLabel << " exceeds vertex per hull limitations." << LL_ENDL;
-					break;
-				}
-			}
-		}
-	}
-
-	if (physExceededVertexLimit)
-	{
-		has_physics_error |= PhysicsError::TOOMANYVERTSINHULL;
-	}
-
-	if (!(has_physics_error & PhysicsError::DEGENERATE)){ // only update this field (incluides clearing it) if it is not already in use.
-		mFMP->childSetVisible("physics_status_message_text", physExceededVertexLimit);
-		LLIconCtrl* physStatusIcon = mFMP->getChild<LLIconCtrl>("physics_status_message_icon");
-		physStatusIcon->setVisible(physExceededVertexLimit);
-		if (physExceededVertexLimit)
-		{
-			mFMP->childSetValue("physics_status_message_text", mFMP->getString("phys_status_vertex_limit_exceeded"));
-			LLUIImagePtr img = LLUI::getUIImage("ModelImport_Status_Warning");
-			physStatusIcon->setImage(img);
-		}
-	}
-
-	if (getLoadState() >= LLModelLoader::ERROR_PARSING)
-	{
-		mModelNoErrors = false;
-		LL_INFOS() << "Loader returned errors, model can't be uploaded" << LL_ENDL;
-	}
-
-	bool uploadingSkin		     = mFMP->childGetValue("upload_skin").asBoolean();
-	bool uploadingJointPositions = mFMP->childGetValue("upload_joints").asBoolean();
-
-	if ( uploadingSkin )
-	{
-		if ( uploadingJointPositions && !isRigValidForJointPositionUpload() )
-		{
-			mModelNoErrors = false;
-			LL_INFOS() << "Invalid rig, there might be issues with uploading Joint positions" << LL_ENDL;
-		}
-	}
-
-	if(mModelNoErrors && mModelLoader)
-	{
-		if(!mModelLoader->areTexturesReady() && mFMP->childGetValue("upload_textures").asBoolean())
-		{
-			// Some textures are still loading, prevent upload until they are done
-			mModelNoErrors = false;
-		}
-	}
-
-	if (!mModelNoErrors || mHasDegenerate)
-	{
-		mFMP->childDisable("ok_btn");
-		mFMP->childDisable("calculate_btn");
-	}
-	else
-	{
-		mFMP->childEnable("ok_btn");
-		mFMP->childEnable("calculate_btn");
-	}
-
-    if (mModelNoErrors && mLodsWithParsingError.empty())
-    {
-        mFMP->childEnable("calculate_btn");
-    }
-    else
-    {
-        mFMP->childDisable("calculate_btn");
-    }
-	
-	//add up physics triangles etc
-	S32 phys_tris = 0;
-	S32 phys_hulls = 0;
-	S32 phys_points = 0;
-
-	//get the triangle count for the whole scene
-	for (LLModelLoader::scene::iterator iter = mScene[LLModel::LOD_PHYSICS].begin(), endIter = mScene[LLModel::LOD_PHYSICS].end(); iter != endIter; ++iter)
-	{
-		for (LLModelLoader::model_instance_list::iterator instance = iter->second.begin(), end_instance = iter->second.end(); instance != end_instance; ++instance)
-		{
-			LLModel* model = instance->mModel;
-			if (model)
-			{
-				S32 cur_submeshes = model->getNumVolumeFaces();
-
-				LLModel::convex_hull_decomposition& decomp = model->mPhysics.mHull;
-
-				if (!decomp.empty())
-				{
-					phys_hulls += decomp.size();
-					for (U32 i = 0; i < decomp.size(); ++i)
-					{
-						phys_points += decomp[i].size();
-					}
-				}
-				else
-				{ //choose physics shape OR decomposition, can't use both
-					for (S32 j = 0; j < cur_submeshes; ++j)
-					{ //for each submesh (face), add triangles and vertices to current total
-						const LLVolumeFace& face = model->getVolumeFace(j);
-						phys_tris += face.mNumIndices/3;
-					}
-				}
-			}
-		}
-	}
-
-	if (phys_tris > 0)
-	{
-		mFMP->childSetTextArg("physics_triangles", "[TRIANGLES]", llformat("%d", phys_tris));
-	}
-	else
-	{
-		mFMP->childSetTextArg("physics_triangles", "[TRIANGLES]", mesh_status_na);
-	}
-
-	if (phys_hulls > 0)
-	{
-		mFMP->childSetTextArg("physics_hulls", "[HULLS]", llformat("%d", phys_hulls));
-		mFMP->childSetTextArg("physics_points", "[POINTS]", llformat("%d", phys_points));
-	}
-	else
-	{
-		mFMP->childSetTextArg("physics_hulls", "[HULLS]", mesh_status_na);
-		mFMP->childSetTextArg("physics_points", "[POINTS]", mesh_status_na);
-	}
-
-	LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
-	if (fmp)
-	{
-		if (phys_tris > 0 || phys_hulls > 0)
-		{
-			if (!fmp->isViewOptionEnabled("show_physics"))
-			{
-				fmp->enableViewOption("show_physics");
-				mViewOption["show_physics"] = true;
-				fmp->childSetValue("show_physics", true);
-			}
-		}
-		else
-		{
-			fmp->disableViewOption("show_physics");
-			mViewOption["show_physics"] = false;
-			fmp->childSetValue("show_physics", false);
-
-		}
-
-		//bool use_hull = fmp->childGetValue("physics_use_hull").asBoolean();
-
-		//fmp->childSetEnabled("physics_optimize", !use_hull);
-
-		bool enable = (phys_tris > 0 || phys_hulls > 0) && fmp->mCurRequest.empty();
-		//enable = enable && !use_hull && fmp->childGetValue("physics_optimize").asBoolean();
-
-		//enable/disable "analysis" UI
-		LLPanel* panel = fmp->getChild<LLPanel>("physics analysis");
-		LLView* child = panel->getFirstChild();
-		while (child)
-		{
-			child->setEnabled(enable);
-			child = panel->findNextSibling(child);
-		}
-
-		enable = phys_hulls > 0 && fmp->mCurRequest.empty();
-		//enable/disable "simplification" UI
-		panel = fmp->getChild<LLPanel>("physics simplification");
-		child = panel->getFirstChild();
-		while (child)
-		{
-			child->setEnabled(enable);
-			child = panel->findNextSibling(child);
-		}
-
-		if (fmp->mCurRequest.empty())
-		{
-			fmp->childSetVisible("Simplify", true);
-			fmp->childSetVisible("simplify_cancel", false);
-			fmp->childSetVisible("Decompose", true);
-			fmp->childSetVisible("decompose_cancel", false);
-
-			if (phys_hulls > 0)
-			{
-				fmp->childEnable("Simplify");
-			}
-		
-			if (phys_tris || phys_hulls > 0)
-			{
-				fmp->childEnable("Decompose");
-			}
-		}
-		else
-		{
-			fmp->childEnable("simplify_cancel");
-			fmp->childEnable("decompose_cancel");
-		}
-	}
-
-	
-	LLCtrlSelectionInterface* iface = fmp->childGetSelectionInterface("physics_lod_combo");
-	S32 which_mode = 0; 
-	S32 file_mode = 1;
-	if (iface)
-	{
-		which_mode = iface->getFirstSelectedIndex();
-		file_mode = iface->getItemCount() - 1;
-	}
-
-	if (which_mode == file_mode)
-	{
-		mFMP->childEnable("physics_file");
-		mFMP->childEnable("physics_browse");
-	}
-	else
-	{
-		mFMP->childDisable("physics_file");
-		mFMP->childDisable("physics_browse");
-	}
-
-	LLSpinCtrl* crease = mFMP->getChild<LLSpinCtrl>("crease_angle");
-	
-	if (mRequestedCreaseAngle[mPreviewLOD] == -1.f)
-	{
-		mFMP->childSetColor("crease_label", LLColor4::grey);
-		crease->forceSetValue(75.f);
-	}
-	else
-	{
-		mFMP->childSetColor("crease_label", LLColor4::white);
-		crease->forceSetValue(mRequestedCreaseAngle[mPreviewLOD]);
-	}
-
-	mModelUpdatedSignal(true);
-
-}
-
-void LLModelPreview::updateLodControls(S32 lod)
-{
-	if (lod < LLModel::LOD_IMPOSTOR || lod > LLModel::LOD_HIGH)
-	{
-		std::ostringstream out;
-		out << "Invalid level of detail: " << lod;
-		LL_WARNS() << out.str() << LL_ENDL;
-		LLFloaterModelPreview::addStringToLog(out, false);
-		assert(lod >= LLModel::LOD_IMPOSTOR && lod <= LLModel::LOD_HIGH);
-		return;
-	}
-
-	const char* lod_controls[] =
-	{
-		"lod_mode_",
-		"lod_triangle_limit_",
-		"lod_error_threshold_"
-	};
-	const U32 num_lod_controls = sizeof(lod_controls)/sizeof(char*);
-
-	const char* file_controls[] =
-	{
-		"lod_browse_",
-		"lod_file_",
-	};
-	const U32 num_file_controls = sizeof(file_controls)/sizeof(char*);
-
-	LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
-	if (!fmp) return;
-
-	LLComboBox* lod_combo = mFMP->findChild<LLComboBox>("lod_source_" + lod_name[lod]);
-	if (!lod_combo) return;
-
-	S32 lod_mode = lod_combo->getCurrentIndex();
-	if (lod_mode == LOD_FROM_FILE) // LoD from file
-	{
-		fmp->mLODMode[lod] = 0;
-		for (U32 i = 0; i < num_file_controls; ++i)
-		{
-			mFMP->childSetVisible(file_controls[i] + lod_name[lod], true);
-		}
-
-		for (U32 i = 0; i < num_lod_controls; ++i)
-		{
-			mFMP->childSetVisible(lod_controls[i] + lod_name[lod], false);
-		}
-	}
-	else if (lod_mode == USE_LOD_ABOVE) // use LoD above
-	{
-		fmp->mLODMode[lod] = 2;
-		for (U32 i = 0; i < num_file_controls; ++i)
-		{
-			mFMP->childSetVisible(file_controls[i] + lod_name[lod], false);
-		}
-
-		for (U32 i = 0; i < num_lod_controls; ++i)
-		{
-			mFMP->childSetVisible(lod_controls[i] + lod_name[lod], false);
-		}
-
-		if (lod < LLModel::LOD_HIGH)
-		{
-			mModel[lod] = mModel[lod + 1];
-			mScene[lod] = mScene[lod + 1];
-			mVertexBuffer[lod].clear();
-
-			// Also update lower LoD
-			if (lod > LLModel::LOD_IMPOSTOR)
-			{
-				updateLodControls(lod - 1);
-			}
-		}
-	}
-	else // auto generate, the default case for all LoDs except High
-	{
-		fmp->mLODMode[lod] = 1;
-
-		//don't actually regenerate lod when refreshing UI
-		mLODFrozen = true;
-
-		for (U32 i = 0; i < num_file_controls; ++i)
-		{
-			mFMP->getChildView(file_controls[i] + lod_name[lod])->setVisible(false);
-		}
-
-		for (U32 i = 0; i < num_lod_controls; ++i)
-		{
-			mFMP->getChildView(lod_controls[i] + lod_name[lod])->setVisible(true);
-		}
-
-
-		LLSpinCtrl* threshold = mFMP->getChild<LLSpinCtrl>("lod_error_threshold_" + lod_name[lod]);
-		LLSpinCtrl* limit = mFMP->getChild<LLSpinCtrl>("lod_triangle_limit_" + lod_name[lod]);
-
-		limit->setMaxValue(mMaxTriangleLimit);
-		limit->forceSetValue(mRequestedTriangleCount[lod]);
-
-		threshold->forceSetValue(mRequestedErrorThreshold[lod]);
-
-		mFMP->getChild<LLComboBox>("lod_mode_" + lod_name[lod])->selectNthItem(mRequestedLoDMode[lod]);
-
-		if (mRequestedLoDMode[lod] == 0)
-		{
-			limit->setVisible(true);
-			threshold->setVisible(false);
-
-			limit->setMaxValue(mMaxTriangleLimit);
-			limit->setIncrement(mMaxTriangleLimit/32);
-		}
-		else
-		{
-			limit->setVisible(false);
-			threshold->setVisible(true);
-		}
-
-		mLODFrozen = false;
-	}
-}
-
-void LLModelPreview::setPreviewTarget(F32 distance)
-{
-	mCameraDistance = distance;
-	mCameraZoom = 1.f;
-	mCameraPitch = 0.f;
-	mCameraYaw = 0.f;
-	mCameraOffset.clearVec();
-}
-
-void LLModelPreview::clearBuffers()
-{
-	for (U32 i = 0; i < 6; i++)
-	{
-		mVertexBuffer[i].clear();
-	}
-}
-
-void LLModelPreview::genBuffers(S32 lod, bool include_skin_weights)
-{
-	U32 tri_count = 0;
-	U32 vertex_count = 0;
-	U32 mesh_count = 0;
-
-	
-	LLModelLoader::model_list* model = NULL;
-
-	if (lod < 0 || lod > 4)
-	{
-		model = &mBaseModel;
-		lod = 5;
-	}
-	else
-	{
-		model = &(mModel[lod]);
-	}
-
-	if (!mVertexBuffer[lod].empty())
-	{
-		mVertexBuffer[lod].clear();
-	}
-
-	mVertexBuffer[lod].clear();
-
-	LLModelLoader::model_list::iterator base_iter = mBaseModel.begin();
-
-	for (LLModelLoader::model_list::iterator iter = model->begin(); iter != model->end(); ++iter)
-	{
-		LLModel* mdl = *iter;
-		if (!mdl)
-		{
-			continue;
-		}
-
-		LLModel* base_mdl = *base_iter;
-		base_iter++;
-
-		S32 num_faces = mdl->getNumVolumeFaces();
-		for (S32 i = 0; i < num_faces; ++i)
-		{
-			const LLVolumeFace &vf = mdl->getVolumeFace(i);
-			U32 num_vertices = vf.mNumVertices;
-			U32 num_indices = vf.mNumIndices;
-
-			if (!num_vertices || ! num_indices)
-			{
-				continue;
-			}
-
-			LLVertexBuffer* vb = NULL;
-
-			bool skinned = include_skin_weights && !mdl->mSkinWeights.empty();
-
-			U32 mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0 ;
-
-			if (skinned)
-			{
-				mask |= LLVertexBuffer::MAP_WEIGHT4;
-			}
-
-			vb = new LLVertexBuffer(mask, 0);
-
-			if (!vb->allocateBuffer(num_vertices, num_indices, TRUE))
-			{
-				// We are likely to crash due this failure, if this happens, find a way to gracefully stop preview
-									std::ostringstream out;
-									out << "Failed to allocate Vertex Buffer for model preview ";
-									out << num_vertices << " vertices and ";
-									out << num_indices << " indices";
-									LL_WARNS() << out.str() << LL_ENDL;
-									LLFloaterModelPreview::addStringToLog(out, true);
-			}
-
-			LLStrider<LLVector3> vertex_strider;
-			LLStrider<LLVector3> normal_strider;
-			LLStrider<LLVector2> tc_strider;
-			LLStrider<U16> index_strider;
-			LLStrider<LLVector4> weights_strider;
-
-			vb->getVertexStrider(vertex_strider);
-			vb->getIndexStrider(index_strider);
-
-			if (skinned)
-			{
-				vb->getWeight4Strider(weights_strider);
-			}
-
-			LLVector4a::memcpyNonAliased16((F32*) vertex_strider.get(), (F32*) vf.mPositions, num_vertices*4*sizeof(F32));
-			
-			if (vf.mTexCoords)
-			{
-				vb->getTexCoord0Strider(tc_strider);
-				S32 tex_size = (num_vertices*2*sizeof(F32)+0xF) & ~0xF;
-				LLVector4a::memcpyNonAliased16((F32*) tc_strider.get(), (F32*) vf.mTexCoords, tex_size);
-			}
-			
-			if (vf.mNormals)
-			{
-				vb->getNormalStrider(normal_strider);
-				LLVector4a::memcpyNonAliased16((F32*) normal_strider.get(), (F32*) vf.mNormals, num_vertices*4*sizeof(F32));
-			}
-
-			if (skinned)
-			{
-				for (U32 i = 0; i < num_vertices; i++)
-				{
-					//find closest weight to vf.mVertices[i].mPosition
-					LLVector3 pos(vf.mPositions[i].getF32ptr());
-
-					const LLModel::weight_list& weight_list = base_mdl->getJointInfluences(pos);
-                    llassert(weight_list.size()>0 && weight_list.size() <= 4); // LLModel::loadModel() should guarantee this
-
-					LLVector4 w(0,0,0,0);
-					
-					for (U32 i = 0; i < weight_list.size(); ++i)
-					{
-						F32 wght = llclamp(weight_list[i].mWeight, 0.001f, 0.999f);
-						F32 joint = (F32) weight_list[i].mJointIdx;
-						w.mV[i] = joint + wght;
-                        llassert(w.mV[i]-(S32)w.mV[i]>0.0f); // because weights are non-zero, and range of wt values
-                                                             //should not cause floating point precision issues.
-					}
-
-					*(weights_strider++) = w;
-				}
-			}
-
-			// build indices
-			for (U32 i = 0; i < num_indices; i++)
-			{
-				*(index_strider++) = vf.mIndices[i];
-			}
-
-			mVertexBuffer[lod][mdl].push_back(vb);
-
-			vertex_count += num_vertices;
-			tri_count += num_indices/3;
-			++mesh_count;
-
-		}
-	}
-}
-
-void LLModelPreview::update()
-{
-    if (mGenLOD)
-    {
-        bool subscribe_for_generation = mLodsQuery.empty();
-        mGenLOD = false;
-        mDirty = true;
-        mLodsQuery.clear();
-
-        for (S32 lod = LLModel::LOD_HIGH; lod >= 0; --lod)
-        {
-            // adding all lods into query for generation
-            mLodsQuery.push_back(lod);
-        }
-
-        if (subscribe_for_generation)
-        {
-            doOnIdleRepeating(lodQueryCallback);
-        }
-    }
-
-    if (mDirty && mLodsQuery.empty())
-	{
-		mDirty = false;
-		mResourceCost = calcResourceCost();
-		refresh();
-		updateStatusMessages();
-	}
-}
-
-//-----------------------------------------------------------------------------
-// createPreviewAvatar
-//-----------------------------------------------------------------------------
-void LLModelPreview::createPreviewAvatar( void )
-{
-	mPreviewAvatar = (LLVOAvatar*)gObjectList.createObjectViewer( LL_PCODE_LEGACY_AVATAR, gAgent.getRegion(), LLViewerObject::CO_FLAG_UI_AVATAR );
-	if ( mPreviewAvatar )
-	{
-		mPreviewAvatar->createDrawable( &gPipeline );
-		mPreviewAvatar->mSpecialRenderMode = 1;
-		mPreviewAvatar->startMotion( ANIM_AGENT_STAND );
-		mPreviewAvatar->hideSkirt();
-	}
-	else
-	{
-		LL_INFOS() << "Failed to create preview avatar for upload model window" << LL_ENDL;
-	}
-}
-
-//static
-U32 LLModelPreview::countRootModels(LLModelLoader::model_list models)
-{
-	U32 root_models = 0;
-	model_list::iterator model_iter = models.begin();
-	while (model_iter != models.end())
-	{
-		LLModel* mdl = *model_iter;
-		if (mdl && mdl->mSubmodelID == 0)
-		{
-			root_models++;
-		}
-		model_iter++;
-	}
-	return root_models;
-}
-
-void LLModelPreview::loadedCallback(
-	LLModelLoader::scene& scene,
-	LLModelLoader::model_list& model_list,
-	S32 lod,
-	void* opaque)
-{
-	LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
-	if (pPreview && !LLModelPreview::sIgnoreLoadedCallback)
-	{
-        // Load loader's warnings into floater's log tab
-        const LLSD out = pPreview->mModelLoader->logOut();
-        LLSD::array_const_iterator iter_out = out.beginArray();
-        LLSD::array_const_iterator end_out = out.endArray();
-        for (; iter_out != end_out; ++iter_out)
-        {
-            if (iter_out->has("Message"))
-            {
-                LLFloaterModelPreview::addStringToLog(iter_out->get("Message"), *iter_out, true, pPreview->mModelLoader->mLod);
-            }
-        }
-        pPreview->mModelLoader->clearLog();
-        pPreview->loadModelCallback(lod); // removes mModelLoader in some cases
-	}
-
-}
-
-void LLModelPreview::stateChangedCallback(U32 state,void* opaque)
-{
-	LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
-	if (pPreview)
-	{
-	 pPreview->setLoadState(state);
-	}
-}
-
-LLJoint* LLModelPreview::lookupJointByName(const std::string& str, void* opaque)
-{
-	LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
-	if (pPreview)
-	{
-		return pPreview->getPreviewAvatar()->getJoint(str);
-	}
-	return NULL;
-}
-
-U32 LLModelPreview::loadTextures(LLImportMaterial& material,void* opaque)
-{
-	(void)opaque;
-
-	if (material.mDiffuseMapFilename.size())
-	{
-		material.mOpaqueData = new LLPointer< LLViewerFetchedTexture >;
-		LLPointer< LLViewerFetchedTexture >& tex = (*reinterpret_cast< LLPointer< LLViewerFetchedTexture > * >(material.mOpaqueData));
-
-		tex = LLViewerTextureManager::getFetchedTextureFromUrl("file://" + material.mDiffuseMapFilename, FTT_LOCAL_FILE, TRUE, LLGLTexture::BOOST_PREVIEW);
-		tex->setLoadedCallback(LLModelPreview::textureLoadedCallback, 0, TRUE, FALSE, opaque, NULL, FALSE);
-		tex->forceToSaveRawImage(0, F32_MAX);
-		material.setDiffuseMap(tex->getID()); // record tex ID
-		return 1;
-	}
-
-	material.mOpaqueData = NULL;
-	return 0;	
-}
-
-void LLModelPreview::addEmptyFace( LLModel* pTarget )
-{
-	U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
-	
-	LLPointer<LLVertexBuffer> buff = new LLVertexBuffer(type_mask, 0);
-	
-	buff->allocateBuffer(1, 3, true);
-	memset( (U8*) buff->getMappedData(), 0, buff->getSize() );
-	memset( (U8*) buff->getIndicesPointer(), 0, buff->getIndicesSize() );
-		
-	buff->validateRange( 0, buff->getNumVerts()-1, buff->getNumIndices(), 0 );
-		
-	LLStrider<LLVector3> pos;
-	LLStrider<LLVector3> norm;
-	LLStrider<LLVector2> tc;
-	LLStrider<U16> index;
-		
-	buff->getVertexStrider(pos);
-		
-	if ( type_mask & LLVertexBuffer::MAP_NORMAL )
-	{
-		buff->getNormalStrider(norm);
-	}
-	if ( type_mask & LLVertexBuffer::MAP_TEXCOORD0 )
-	{
-		buff->getTexCoord0Strider(tc);
-	}
-		
-	buff->getIndexStrider(index);
-		
-	//resize face array
-	int faceCnt = pTarget->getNumVolumeFaces();
-	pTarget->setNumVolumeFaces( faceCnt+1 );	
-	pTarget->setVolumeFaceData( faceCnt+1, pos, norm, tc, index, buff->getNumVerts(), buff->getNumIndices() );
-	
-}
-
-//-----------------------------------------------------------------------------
-// render()
-//-----------------------------------------------------------------------------
-// Todo: we shouldn't be setting all those UI elements on render.
-// Note: Render happens each frame with skinned avatars
-BOOL LLModelPreview::render()
-{
-	assert_main_thread();
-
-	LLMutexLock lock(this);
-	mNeedsUpdate = FALSE;
-
-	bool use_shaders = LLGLSLShader::sNoFixedFunction;
-
-	bool edges = mViewOption["show_edges"];
-	bool joint_overrides = mViewOption["show_joint_overrides"];
-	bool joint_positions = mViewOption["show_joint_positions"];
-	bool skin_weight = mViewOption["show_skin_weight"];
-	bool textures = mViewOption["show_textures"];
-	bool physics = mViewOption["show_physics"];
-
-	// Extra configurability, to be exposed later as controls?
-	static LLCachedControl<LLColor4> canvas_col(gSavedSettings, "MeshPreviewCanvasColor");
-	static LLCachedControl<LLColor4> edge_col(gSavedSettings, "MeshPreviewEdgeColor");
-	static LLCachedControl<LLColor4> base_col(gSavedSettings, "MeshPreviewBaseColor");
-	static LLCachedControl<LLColor3> brightness(gSavedSettings, "MeshPreviewBrightnessColor");
-	static LLCachedControl<F32> edge_width(gSavedSettings, "MeshPreviewEdgeWidth");
-	static LLCachedControl<LLColor4> phys_edge_col(gSavedSettings, "MeshPreviewPhysicsEdgeColor");
-	static LLCachedControl<LLColor4> phys_fill_col(gSavedSettings, "MeshPreviewPhysicsFillColor");
-	static LLCachedControl<F32> phys_edge_width(gSavedSettings, "MeshPreviewPhysicsEdgeWidth");
-	static LLCachedControl<LLColor4> deg_edge_col(gSavedSettings, "MeshPreviewDegenerateEdgeColor");
-	static LLCachedControl<LLColor4> deg_fill_col(gSavedSettings, "MeshPreviewDegenerateFillColor");	
-	static LLCachedControl<F32> deg_edge_width(gSavedSettings, "MeshPreviewDegenerateEdgeWidth");
-	static LLCachedControl<F32> deg_point_size(gSavedSettings, "MeshPreviewDegeneratePointSize");
-
-	S32 width = getWidth();
-	S32 height = getHeight();
-
-	LLGLSUIDefault def; // GL_BLEND, GL_ALPHA_TEST, GL_CULL_FACE, depth test
-	LLGLDisable no_blend(GL_BLEND);
-	LLGLDepthTest depth(GL_FALSE); // SL-12781 disable z-buffer to render background color
-	LLGLDisable fog(GL_FOG);
-
-	{
-		if (use_shaders)
-		{
-			gUIProgram.bind();
-		}
-		//clear background to grey
-		gGL.matrixMode(LLRender::MM_PROJECTION);
-		gGL.pushMatrix();
-		gGL.loadIdentity();
-		gGL.ortho(0.0f, width, 0.0f, height, -1.0f, 1.0f);
-
-		gGL.matrixMode(LLRender::MM_MODELVIEW);
-		gGL.pushMatrix();
-		gGL.loadIdentity();
-
-		gGL.color4fv(static_cast<LLColor4>(canvas_col).mV);
-		gl_rect_2d_simple( width, height );
-
-		gGL.matrixMode(LLRender::MM_PROJECTION);
-		gGL.popMatrix();
-
-		gGL.matrixMode(LLRender::MM_MODELVIEW);
-		gGL.popMatrix();
-		if (use_shaders)
-		{
-			gUIProgram.unbind();
-		}
-	}
-
-	LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
-	
-	bool has_skin_weights = false;
-	bool upload_skin = mFMP->childGetValue("upload_skin").asBoolean();	
-	bool upload_joints = mFMP->childGetValue("upload_joints").asBoolean();
-
-	if ( upload_joints != mLastJointUpdate )
-	{
-		mLastJointUpdate = upload_joints;
-	}
-
-	for (LLModelLoader::scene::iterator iter = mScene[mPreviewLOD].begin(); iter != mScene[mPreviewLOD].end(); ++iter)
-	{
-		for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end(); ++model_iter)
-		{
-			LLModelInstance& instance = *model_iter;
-			LLModel* model = instance.mModel;
-			model->mPelvisOffset = mPelvisZOffset;
-			if (!model->mSkinWeights.empty())
-			{
-				has_skin_weights = true;
-			}
-		}
-	}
-
-	if (has_skin_weights && lodsReady())
-	{ //model has skin weights, enable view options for skin weights and joint positions
-        U32 flags = getLegacyRigFlags();
-        if (fmp)
-        {
-            if (flags == LEGACY_RIG_OK)
-            {
-                fmp->enableViewOption("show_skin_weight");
-                fmp->setViewOptionEnabled("show_joint_overrides", skin_weight);
-                fmp->setViewOptionEnabled("show_joint_positions", skin_weight);
-                mFMP->childEnable("upload_skin");
-                mFMP->childSetValue("show_skin_weight", skin_weight);
-            }
-            else if ((flags & LEGACY_RIG_FLAG_TOO_MANY_JOINTS) > 0)
-            {
-                mFMP->childSetVisible("skin_too_many_joints", true);
-            }
-            else if ((flags & LEGACY_RIG_FLAG_UNKNOWN_JOINT) > 0)
-            {
-                mFMP->childSetVisible("skin_unknown_joint", true);
-            }
-        }
-	}
-	else
-	{
-		mFMP->childDisable("upload_skin");
-		if (fmp)
-		{
-			mViewOption["show_skin_weight"] = false;
-			fmp->disableViewOption("show_skin_weight");
-			fmp->disableViewOption("show_joint_overrides");
-			fmp->disableViewOption("show_joint_positions");
-
-			skin_weight = false;
-			mFMP->childSetValue("show_skin_weight", false);
-			fmp->setViewOptionEnabled("show_skin_weight", skin_weight);
-		}
-	}
-
-	if (upload_skin && !has_skin_weights)
-	{ //can't upload skin weights if model has no skin weights
-		mFMP->childSetValue("upload_skin", false);
-		upload_skin = false;
-	}
-
-	if (!upload_skin && upload_joints)
-	{ //can't upload joints if not uploading skin weights
-		mFMP->childSetValue("upload_joints", false);
-		upload_joints = false;		
-	}	
-
-    if (upload_skin && upload_joints)
-    {
-        mFMP->childEnable("lock_scale_if_joint_position");
-        if (fmp)
-        {
-            fmp->updateAvatarTab();
-        }
-    }
-    else
-    {
-        mFMP->childDisable("lock_scale_if_joint_position");
-        mFMP->childSetValue("lock_scale_if_joint_position", false);
-        if (fmp)
-        {
-            fmp->clearAvatarTab();
-        }
-    }
-    
-	//Only enable joint offsets if it passed the earlier critiquing
-	if ( isRigValidForJointPositionUpload() )  
-	{
-		mFMP->childSetEnabled("upload_joints", upload_skin);
-	}
-
-	F32 explode = mFMP->childGetValue("physics_explode").asReal();
-
-	LLGLDepthTest gls_depth(GL_TRUE); // SL-12781 re-enable z-buffer for 3D model preview
-
-	LLRect preview_rect;
-
-	preview_rect = mFMP->getChildView("preview_panel")->getRect();
-
-	F32 aspect = (F32) preview_rect.getWidth()/preview_rect.getHeight();
-
-	LLViewerCamera::getInstance()->setAspect(aspect);
-
-	LLViewerCamera::getInstance()->setView(LLViewerCamera::getInstance()->getDefaultFOV() / mCameraZoom);
-
-	LLVector3 offset = mCameraOffset;
-	LLVector3 target_pos = mPreviewTarget+offset;
-
-	F32 z_near = 0.001f;
-	F32 z_far = mCameraDistance*10.0f+mPreviewScale.magVec()+mCameraOffset.magVec();
-
-	if (skin_weight)
-	{
-		target_pos = getPreviewAvatar()->getPositionAgent() + offset;
-		z_near = 0.01f;
-		z_far = 1024.f;
-
-		//render avatar previews every frame
-		refresh();
-	}
-
-	if (use_shaders)
-	{
-		gObjectPreviewProgram.bind();
-	}
-
-	gGL.loadIdentity();
-	gPipeline.enableLightsPreview();
-
-	LLQuaternion camera_rot = LLQuaternion(mCameraPitch, LLVector3::y_axis) *
-	LLQuaternion(mCameraYaw, LLVector3::z_axis);
-
-	LLQuaternion av_rot = camera_rot;
-	F32 camera_distance = skin_weight ? SKIN_WEIGHT_CAMERA_DISTANCE : mCameraDistance;
-	LLViewerCamera::getInstance()->setOriginAndLookAt(
-													  target_pos + ((LLVector3(camera_distance, 0.f, 0.f) + offset) * av_rot),		// camera
-													  LLVector3::z_axis,																	// up
-													  target_pos);											// point of interest
-
-
-	z_near = llclamp(z_far * 0.001f, 0.001f, 0.1f);
-
-	LLViewerCamera::getInstance()->setPerspective(FALSE, mOrigin.mX, mOrigin.mY, width, height, FALSE, z_near, z_far);
-
-	stop_glerror();
-
-	gGL.pushMatrix();
-	gGL.color4fv(edge_col().mV);
-
-	const U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
-
-	LLGLEnable normalize(GL_NORMALIZE);
-
-	if (!mBaseModel.empty() && mVertexBuffer[5].empty())
-	{
-		genBuffers(-1, skin_weight);
-		//genBuffers(3);
-		//genLODs();
-	}
-
-	if (!mModel[mPreviewLOD].empty())
-	{
-		mFMP->childEnable("reset_btn");
-
-		bool regen = mVertexBuffer[mPreviewLOD].empty();
-		if (!regen)
-		{
-			const std::vector<LLPointer<LLVertexBuffer> >& vb_vec = mVertexBuffer[mPreviewLOD].begin()->second;
-			if (!vb_vec.empty())
-			{
-				const LLVertexBuffer* buff = vb_vec[0];
-				regen = buff->hasDataType(LLVertexBuffer::TYPE_WEIGHT4) != skin_weight;
-			}
-			else
-			{
-				LL_INFOS() << "Vertex Buffer[" << mPreviewLOD << "]" << " is EMPTY!!!" << LL_ENDL;
-				regen = TRUE;
-			}
-		}
-
-		if (regen)
-		{
-			genBuffers(mPreviewLOD, skin_weight);
-		}
-
-		if (!skin_weight)
-		{
-			for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
-			{
-				LLModelInstance& instance = *iter;
-
-				LLModel* model = instance.mLOD[mPreviewLOD];
-
-					if (!model)
-					{
-						continue;
-					}
-
-					gGL.pushMatrix();
-					LLMatrix4 mat = instance.mTransform;
-
-					gGL.multMatrix((GLfloat*) mat.mMatrix);
-
-
-					U32 num_models = mVertexBuffer[mPreviewLOD][model].size();
-					for (U32 i = 0; i < num_models; ++i)
-					{
-						LLVertexBuffer* buffer = mVertexBuffer[mPreviewLOD][model][i];
-				
-						buffer->setBuffer(type_mask & buffer->getTypeMask());
-
-						if (textures)
-						{
-							int materialCnt = instance.mModel->mMaterialList.size();
-							if ( i < materialCnt )
-							{
-								const std::string& binding = instance.mModel->mMaterialList[i];						
-								const LLImportMaterial& material = instance.mMaterial[binding];
-
-								gGL.diffuseColor4fv(material.mDiffuseColor.mV);
-
-								// Find the tex for this material, bind it, and add it to our set
-								//
-								LLViewerFetchedTexture* tex = bindMaterialDiffuseTexture(material);
-								if (tex)
-								{
-									mTextureSet.insert(tex);
-								}
-							}
-						}
-						else
-						{
-							gGL.diffuseColor4fv(static_cast<LLColor4>(base_col).mV);
-						}
-
-						buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts()-1, buffer->getNumIndices(), 0);
-						gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
-						gGL.diffuseColor4fv(static_cast<LLColor4>(edge_col).mV);
-						if (edges)
-						{
-							glLineWidth(edge_width);
-							glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-							buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts()-1, buffer->getNumIndices(), 0);
-							glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-							glLineWidth(1.f);
-						}
-					}
-					gGL.popMatrix();
-				}
-
-			if (physics)
-			{
-				glClear(GL_DEPTH_BUFFER_BIT);
-				
-				for (U32 pass = 0; pass < 2; pass++)
-				{
-					if (pass == 0)
-					{ //depth only pass
-						gGL.setColorMask(false, false);
-					}
-					else
-					{
-						gGL.setColorMask(true, true);
-					}
-
-					//enable alpha blending on second pass but not first pass
-					LLGLState blend(GL_BLEND, pass);
-
-					gGL.blendFunc(LLRender::BF_SOURCE_ALPHA, LLRender::BF_ONE_MINUS_SOURCE_ALPHA);
-
-					for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
-					{
-						LLModelInstance& instance = *iter;
-
-						LLModel* model = instance.mLOD[LLModel::LOD_PHYSICS];
-
-						if (!model)
-						{
-							continue;
-						}
-
-						gGL.pushMatrix();
-						LLMatrix4 mat = instance.mTransform;
-
-						gGL.multMatrix((GLfloat*)mat.mMatrix);
-
-
-						bool render_mesh = true;
-						LLPhysicsDecomp* decomp = gMeshRepo.mDecompThread;
-						if (decomp)
-						{
-							LLMutexLock(decomp->mMutex);
-
-							LLModel::Decomposition& physics = model->mPhysics;
-
-							if (!physics.mHull.empty())
-							{
-								render_mesh = false;
-
-								if (physics.mMesh.empty())
-								{ //build vertex buffer for physics mesh
-									gMeshRepo.buildPhysicsMesh(physics);
-								}
-
-								if (!physics.mMesh.empty())
-								{ //render hull instead of mesh
-									for (U32 i = 0; i < physics.mMesh.size(); ++i)
-									{
-										if (explode > 0.f)
-										{
-											gGL.pushMatrix();
-
-											LLVector3 offset = model->mHullCenter[i] - model->mCenterOfHullCenters;
-											offset *= explode;
-
-											gGL.translatef(offset.mV[0], offset.mV[1], offset.mV[2]);
-										}
-
-										static std::vector<LLColor4U> hull_colors;
-
-										if (i + 1 >= hull_colors.size())
-										{
-											hull_colors.push_back(LLColor4U(rand() % 128 + 127, rand() % 128 + 127, rand() % 128 + 127, 128));
-										}
-
-										gGL.diffuseColor4ubv(hull_colors[i].mV);
-										LLVertexBuffer::drawArrays(LLRender::TRIANGLES, physics.mMesh[i].mPositions, physics.mMesh[i].mNormals);
-
-										if (explode > 0.f)
-										{
-											gGL.popMatrix();
-										}
-									}
-								}
-							}
-						}
-
-						if (render_mesh)
-						{
-							if (mVertexBuffer[LLModel::LOD_PHYSICS].empty())
-							{
-								genBuffers(LLModel::LOD_PHYSICS, false);
-							}
-
-							U32 num_models = mVertexBuffer[LLModel::LOD_PHYSICS][model].size();
-							if (pass > 0){
-								for (U32 i = 0; i < num_models; ++i)
-								{
-									LLVertexBuffer* buffer = mVertexBuffer[LLModel::LOD_PHYSICS][model][i];
-
-									gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
-									gGL.diffuseColor4fv(phys_fill_col().mV);
-
-									buffer->setBuffer(type_mask & buffer->getTypeMask());
-									buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
-
-									gGL.diffuseColor4fv(phys_edge_col().mV);
-									glLineWidth(phys_edge_width);
-									glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-									buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
-
-									glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-									glLineWidth(1.f);
-								}
-							}
-						}
-                        gGL.popMatrix();
-                    }
-
-					// only do this if mDegenerate was set in the preceding mesh checks [Check this if the ordering ever breaks]
-					if (pass > 0 && mHasDegenerate)
-					{
-						glLineWidth(deg_edge_width);
-						glPointSize(deg_point_size);
-                        gPipeline.enableLightsFullbright();
-						//show degenerate triangles
-						LLGLDepthTest depth(GL_TRUE, GL_TRUE, GL_ALWAYS);
-						LLGLDisable cull(GL_CULL_FACE);
-                        gGL.diffuseColor4f(1.f, 0.f, 0.f, 1.f);
-						const LLVector4a scale(0.5f);
-
-						for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
-						{
-							LLModelInstance& instance = *iter;
-
-							LLModel* model = instance.mLOD[LLModel::LOD_PHYSICS];
-
-							if (!model)
-							{
-								continue;
-							}
-
-							gGL.pushMatrix();
-							LLMatrix4 mat = instance.mTransform;
-
-							gGL.multMatrix((GLfloat*)mat.mMatrix);
-
-
-							LLPhysicsDecomp* decomp = gMeshRepo.mDecompThread;
-							if (decomp)
-							{
-								LLMutexLock(decomp->mMutex);
-
-								LLModel::Decomposition& physics = model->mPhysics;
-
-								if (physics.mHull.empty())
-								{
-									if (mVertexBuffer[LLModel::LOD_PHYSICS].empty())
-									{
-										genBuffers(LLModel::LOD_PHYSICS, false);
-									}
-
-									U32 num_models = mVertexBuffer[LLModel::LOD_PHYSICS][model].size();
-									for (U32 v = 0; v < num_models; ++v)
-									{
-										LLVertexBuffer* buffer = mVertexBuffer[LLModel::LOD_PHYSICS][model][v];
-										if(buffer->getNumVerts() < 3)continue;
-
-										buffer->setBuffer(type_mask & buffer->getTypeMask());
-
-										LLStrider<LLVector3> pos_strider;
-										buffer->getVertexStrider(pos_strider, 0);
-										LLVector4a* pos = (LLVector4a*)pos_strider.get();
-
-										LLStrider<U16> idx;
-										buffer->getIndexStrider(idx, 0);
-
-										LLVector4a v1, v2, v3;
-										for (U32 indices_offset = 0; indices_offset < buffer->getNumIndices(); indices_offset += 3)
-										{
-											v1.setMul(pos[*idx++], scale);
-											v2.setMul(pos[*idx++], scale);
-											v3.setMul(pos[*idx++], scale);
-
-											if (ll_is_degenerate(v1, v2, v3))
-											{
-												glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-												gGL.diffuseColor3fv(deg_edge_col().mV);
-												buffer->drawRange(LLRender::TRIANGLES, 0, 2, 3, indices_offset);
-												buffer->drawRange(LLRender::POINTS, 0, 2, 3, indices_offset);
-												glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-												gGL.diffuseColor3fv(deg_fill_col().mV);
-												buffer->drawRange(LLRender::TRIANGLES, 0, 2, 3, indices_offset);
-											}
-										}
-									}
-								}
-							}
-
-							gGL.popMatrix();
-						}
-						glLineWidth(1.f);
-						glPointSize(1.f);
-						gPipeline.enableLightsPreview();
-						gGL.setSceneBlendType(LLRender::BT_ALPHA);
-					}
-				}
-			}
-		}
-		else
-		{
-			target_pos = getPreviewAvatar()->getPositionAgent();
-            getPreviewAvatar()->clearAttachmentOverrides(); // removes pelvis fixup
-            LLUUID fake_mesh_id;
-            fake_mesh_id.generate();
-            getPreviewAvatar()->addPelvisFixup(mPelvisZOffset, fake_mesh_id);
-			bool pelvis_recalc = false;
-
-			LLViewerCamera::getInstance()->setOriginAndLookAt(
-															  target_pos + ((LLVector3(camera_distance, 0.f, 0.f) + offset) * av_rot),		// camera
-															  LLVector3::z_axis,																	// up
-															  target_pos);											// point of interest
-
-			for (LLModelLoader::scene::iterator iter = mScene[mPreviewLOD].begin(); iter != mScene[mPreviewLOD].end(); ++iter)
-			{
-				for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end(); ++model_iter)
-				{
-					LLModelInstance& instance = *model_iter;
-					LLModel* model = instance.mModel;
-
-					if (!model->mSkinWeights.empty())
-					{
-                        const LLMeshSkinInfo *skin = &model->mSkinInfo;
-                        LLSkinningUtil::initJointNums(&model->mSkinInfo, getPreviewAvatar());// inits skin->mJointNums if nessesary
-                        U32 count = LLSkinningUtil::getMeshJointCount(skin);
-
-                        if (joint_overrides && skin->mAlternateBindMatrix.size() > 0)
-                        {
-                            // mesh_id is used to determine which mesh gets to
-                            // set the joint offset, in the event of a conflict. Since
-                            // we don't know the mesh id yet, we can't guarantee that
-                            // joint offsets will be applied with the same priority as
-                            // in the uploaded model. If the file contains multiple
-                            // meshes with conflicting joint offsets, preview may be
-                            // incorrect.
-                            LLUUID fake_mesh_id;
-                            fake_mesh_id.generate();
-                            for (U32 j = 0; j < count; ++j)
-                            {
-                                LLJoint *joint = getPreviewAvatar()->getJoint(skin->mJointNums[j]);
-                                if (joint)
-                                {
-                                    const LLVector3& jointPos = skin->mAlternateBindMatrix[j].getTranslation();
-                                    if (joint->aboveJointPosThreshold(jointPos))
-                                    {
-                                        bool override_changed;
-                                        joint->addAttachmentPosOverride(jointPos, fake_mesh_id, "model", override_changed);
-
-                                        if (override_changed)
-                                        {
-                                            //If joint is a pelvis then handle old/new pelvis to foot values
-                                            if (joint->getName() == "mPelvis")// or skin->mJointNames[j]
-                                            {
-                                                pelvis_recalc = true;
-                                            }
-                                        }
-                                        if (skin->mLockScaleIfJointPosition)
-                                        {
-                                            // Note that unlike positions, there's no threshold check here,
-                                            // just a lock at the default value.
-                                            joint->addAttachmentScaleOverride(joint->getDefaultScale(), fake_mesh_id, "model");
-                                        }
-                                    }
-                                }
-                            }
-                        }
-
-						for (U32 i = 0, e = mVertexBuffer[mPreviewLOD][model].size(); i < e; ++i)
-						{
-							LLVertexBuffer* buffer = mVertexBuffer[mPreviewLOD][model][i];
-
-							const LLVolumeFace& face = model->getVolumeFace(i);
-
-							LLStrider<LLVector3> position;
-							buffer->getVertexStrider(position);
-
-							LLStrider<LLVector4> weight;
-							buffer->getWeight4Strider(weight);
-
-							//quick 'n dirty software vertex skinning
-
-							//build matrix palette
-
-							LLMatrix4a mat[LL_MAX_JOINTS_PER_MESH_OBJECT];
-                            LLSkinningUtil::initSkinningMatrixPalette((LLMatrix4*)mat, count,
-                                                                        skin, getPreviewAvatar());
-
-                            LLMatrix4a bind_shape_matrix;
-                            bind_shape_matrix.loadu(skin->mBindShapeMatrix);
-                            U32 max_joints = LLSkinningUtil::getMaxJointCount();
-							for (U32 j = 0; j < buffer->getNumVerts(); ++j)
-							{
-                                LLMatrix4a final_mat;
-                                F32 *wptr = weight[j].mV;
-                                LLSkinningUtil::getPerVertexSkinMatrix(wptr, mat, true, final_mat, max_joints);
-
-								//VECTORIZE THIS
-                                LLVector4a& v = face.mPositions[j];
-
-                                LLVector4a t;
-                                LLVector4a dst;
-                                bind_shape_matrix.affineTransform(v, t);
-                                final_mat.affineTransform(t, dst);
-
-								position[j][0] = dst[0];
-								position[j][1] = dst[1];
-								position[j][2] = dst[2];
-							}
-
-							llassert(model->mMaterialList.size() > i); 
-							const std::string& binding = instance.mModel->mMaterialList[i];
-							const LLImportMaterial& material = instance.mMaterial[binding];
-
-							buffer->setBuffer(type_mask & buffer->getTypeMask());
-							gGL.diffuseColor4fv(material.mDiffuseColor.mV);
-							gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
-
-							// Find the tex for this material, bind it, and add it to our set
-							//
-							LLViewerFetchedTexture* tex = bindMaterialDiffuseTexture(material);
-							if (tex)
-							{
-								mTextureSet.insert(tex);
-							}
-						
-							buffer->draw(LLRender::TRIANGLES, buffer->getNumIndices(), 0);
-
-							if (edges)
-							{
-								gGL.diffuseColor4fv(edge_col().mV);
-								glLineWidth(edge_width);
-								glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
-								buffer->draw(LLRender::TRIANGLES, buffer->getNumIndices(), 0);
-								glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-								glLineWidth(1.f);
-							}
-						}
-					}
-				}
-			}
-
-			if (joint_positions)
-			{
-				LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
-				if (shader)
-				{
-					gDebugProgram.bind();
-				}
-				getPreviewAvatar()->renderCollisionVolumes();
-                if (fmp->mTabContainer->getCurrentPanelIndex() == fmp->mAvatarTabIndex)
-                {
-                    getPreviewAvatar()->renderBones(fmp->mSelectedJointName);
-                }
-                else
-                {
-                    getPreviewAvatar()->renderBones();
-                }
-				if (shader)
-				{
-					shader->bind();
-				}
-			}
-
-            if (pelvis_recalc)
-            {
-                // size/scale recalculation
-                getPreviewAvatar()->postPelvisSetRecalc();
-            }
-		}
-	}
-
-	if (use_shaders)
-	{
-		gObjectPreviewProgram.unbind();
-	}
-
-	gGL.popMatrix();
-
-	return TRUE;
-}
-
-//-----------------------------------------------------------------------------
-// refresh()
-//-----------------------------------------------------------------------------
-void LLModelPreview::refresh()
-{
-	mNeedsUpdate = TRUE;
-}
-
-//-----------------------------------------------------------------------------
-// rotate()
-//-----------------------------------------------------------------------------
-void LLModelPreview::rotate(F32 yaw_radians, F32 pitch_radians)
-{
-	mCameraYaw = mCameraYaw + yaw_radians;
-
-	mCameraPitch = llclamp(mCameraPitch + pitch_radians, F_PI_BY_TWO * -0.8f, F_PI_BY_TWO * 0.8f);
-}
-
-//-----------------------------------------------------------------------------
-// zoom()
-//-----------------------------------------------------------------------------
-void LLModelPreview::zoom(F32 zoom_amt)
-{
-	F32 new_zoom = mCameraZoom+zoom_amt;
-	// TODO: stop clamping in render
-	static LLCachedControl<F32> zoom_limit(gSavedSettings, "MeshPreviewZoomLimit");
-	mCameraZoom	= llclamp(new_zoom, 1.f, zoom_limit());
-}
-
-void LLModelPreview::pan(F32 right, F32 up)
-{
-	bool skin_weight = mViewOption["show_skin_weight"];
-	F32 camera_distance = skin_weight ? SKIN_WEIGHT_CAMERA_DISTANCE : mCameraDistance;
-	mCameraOffset.mV[VY] = llclamp(mCameraOffset.mV[VY] + right * camera_distance / mCameraZoom, -1.f, 1.f);
-	mCameraOffset.mV[VZ] = llclamp(mCameraOffset.mV[VZ] + up * camera_distance / mCameraZoom, -1.f, 1.f);
-}
-
-void LLModelPreview::setPreviewLOD(S32 lod)
-{
-	lod = llclamp(lod, 0, (S32) LLModel::LOD_HIGH);
-
-	if (lod != mPreviewLOD)
-	{
-		mPreviewLOD = lod;
-
-		LLComboBox* combo_box = mFMP->getChild<LLComboBox>("preview_lod_combo");
-		combo_box->setCurrentByIndex((NUM_LOD-1)-mPreviewLOD); // combo box list of lods is in reverse order
-		mFMP->childSetValue("lod_file_" + lod_name[mPreviewLOD], mLODFile[mPreviewLOD]);
-
-		LLColor4 highlight_color = LLUIColorTable::instance().getColor("MeshImportTableHighlightColor");
-		LLColor4 normal_color = LLUIColorTable::instance().getColor("MeshImportTableNormalColor");
-
-		for (S32 i = 0; i <= LLModel::LOD_HIGH; ++i)
-		{
-			const LLColor4& color = (i == lod) ? highlight_color : normal_color;
-
-			mFMP->childSetColor(lod_status_name[i], color);
-			mFMP->childSetColor(lod_label_name[i], color);
-			mFMP->childSetColor(lod_triangles_name[i], color);
-			mFMP->childSetColor(lod_vertices_name[i], color);
-		}
-
-        LLFloaterModelPreview* fmp = (LLFloaterModelPreview*)mFMP;
-        if (fmp)
-        {
-            // make preview repopulate tab
-            fmp->clearAvatarTab();
-        }
-	}
-	refresh();
-	updateStatusMessages();
-}
-
 void LLFloaterModelPreview::onBrowseLOD(S32 lod)
 {
 	assert_main_thread();
@@ -4982,60 +1525,6 @@ void LLFloaterModelPreview::refresh()
 	sInstance->mModelPreview->mDirty = true;
 }
 
-//static
-void LLModelPreview::textureLoadedCallback(
-    BOOL success,
-    LLViewerFetchedTexture *src_vi,
-    LLImageRaw* src,
-    LLImageRaw* src_aux,
-    S32 discard_level,
-    BOOL final,
-    void* userdata )
-{
-	LLModelPreview* preview = (LLModelPreview*) userdata;
-	preview->refresh();
-
-	if(final && preview->mModelLoader)
-	{
-		if(preview->mModelLoader->mNumOfFetchingTextures > 0)
-		{
-			preview->mModelLoader->mNumOfFetchingTextures-- ;
-		}
-	}
-}
-
-// static
-bool LLModelPreview::lodQueryCallback()
-{
-    // not the best solution, but model preview belongs to floater
-    // so it is an easy way to check that preview still exists.
-    LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
-    if (fmp && fmp->mModelPreview)
-    {
-        LLModelPreview* preview = fmp->mModelPreview;
-        if (preview->mLodsQuery.size() > 0)
-        {
-            S32 lod = preview->mLodsQuery.back();
-            preview->mLodsQuery.pop_back();
-            preview->genLODs(lod);
-
-            // return false to continue cycle
-            return false;
-        }
-    }
-    // nothing to process
-    return true;
-}
-
-void LLModelPreview::onLODParamCommit(S32 lod, bool enforce_tri_limit)
-{
-	if (!mLODFrozen)
-	{
-		genLODs(lod, 3, enforce_tri_limit);
-		refresh();
-	}
-}
-
 LLFloaterModelPreview::DecompRequest::DecompRequest(const std::string& stage, LLModel* mdl)
 {
 	mStage = stage;
diff --git a/indra/newview/llfloatermodelpreview.h b/indra/newview/llfloatermodelpreview.h
index 6f78d534f3..ca52312756 100644
--- a/indra/newview/llfloatermodelpreview.h
+++ b/indra/newview/llfloatermodelpreview.h
@@ -28,37 +28,14 @@
 #define LL_LLFLOATERMODELPREVIEW_H
 
 #include "llfloaternamedesc.h"
-
-#include "lldynamictexture.h"
-#include "llquaternion.h"
-#include "llmeshrepository.h"
-#include "llmodel.h"
-#include "llthread.h"
-#include "llviewermenufile.h"
 #include "llfloatermodeluploadbase.h"
-
-#include "lldaeloader.h"
+#include "llmeshrepository.h"
 
 class LLComboBox;
 class LLJoint;
-class LLViewerJointMesh;
-class LLVOAvatar;
-class LLTextBox;
-class LLVertexBuffer;
+class LLMeshFilePicker;
 class LLModelPreview;
-class LLFloaterModelPreview;
-class DAE;
-class daeElement;
-class domProfile_COMMON;
-class domInstance_geometry;
-class domNode;
-class domTranslate;
-class domController;
-class domSkin;
-class domMesh;
-class LLMenuButton;
 class LLTabContainer;
-class LLToggleableMenu;
 class LLViewerTextEditor;
 
 
@@ -255,209 +232,4 @@ private:
 	joint_override_data_map_t mJointOverrides[LLModel::NUM_LODS];
 };
 
-class LLMeshFilePicker : public LLFilePickerThread
-{
-public:
-	LLMeshFilePicker(LLModelPreview* mp, S32 lod);
-	virtual void notify(const std::vector<std::string>& filenames);
-
-private:
-	LLModelPreview* mMP;
-	S32 mLOD;
-};
-
-
-class LLModelPreview : public LLViewerDynamicTexture, public LLMutex
-{
-    LOG_CLASS(LLModelPreview);
-    
-	typedef boost::signals2::signal<void (F32 x, F32 y, F32 z, F32 streaming_cost, F32 physics_cost)> details_signal_t;
-	typedef boost::signals2::signal<void (void)> model_loaded_signal_t;
-	typedef boost::signals2::signal<void (bool)> model_updated_signal_t;
-
-public:
-
-	typedef enum
-	{
-		LOD_FROM_FILE = 0,
-		GENERATE,
-		USE_LOD_ABOVE,
-	} eLoDMode;
-
-public:
-	LLModelPreview(S32 width, S32 height, LLFloater* fmp);
-	virtual ~LLModelPreview();
-
-	void resetPreviewTarget();
-	void setPreviewTarget(F32 distance);
-	void setTexture(U32 name) { mTextureName = name; }
-
-	void setPhysicsFromLOD(S32 lod);
-	BOOL render();
-	void update();
-	void genBuffers(S32 lod, bool skinned);
-	void clearBuffers();
-	void refresh();
-	void rotate(F32 yaw_radians, F32 pitch_radians);
-	void zoom(F32 zoom_amt);
-	void pan(F32 right, F32 up);
-	virtual BOOL needsRender() { return mNeedsUpdate; }
-	void setPreviewLOD(S32 lod);
-	void clearModel(S32 lod);
-    void getJointAliases(JointMap& joint_map);
-	void loadModel(std::string filename, S32 lod, bool force_disable_slm = false);
-	void loadModelCallback(S32 lod);
-    bool lodsReady() { return !mGenLOD && mLodsQuery.empty(); }
-    void queryLODs() { mGenLOD = true; };
-	void genLODs(S32 which_lod = -1, U32 decimation = 3, bool enforce_tri_limit = false);
-	void generateNormals();
-	void restoreNormals();
-	U32 calcResourceCost();
-	void rebuildUploadData();
-	void saveUploadData(bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position);
-	void saveUploadData(const std::string& filename, bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position);
-	void clearIncompatible(S32 lod);
-	void updateStatusMessages();
-	void updateLodControls(S32 lod);
-	void clearGLODGroup();
-	void onLODParamCommit(S32 lod, bool enforce_tri_limit);
-	void addEmptyFace( LLModel* pTarget );
-	
-	const bool getModelPivot( void ) const { return mHasPivot; }
-	void setHasPivot( bool val ) { mHasPivot = val; }
-	void setModelPivot( const LLVector3& pivot ) { mModelPivot = pivot; }
-
-	//Is a rig valid so that it can be used as a criteria for allowing for uploading of joint positions
-	//Accessors for joint position upload friendly rigs
-	const bool isRigValidForJointPositionUpload( void ) const { return mRigValidJointUpload; }
-	void setRigValidForJointPositionUpload( bool rigValid ) { mRigValidJointUpload = rigValid; }
-
-	//Accessors for the legacy rigs
-	const bool isLegacyRigValid( void ) const { return mLegacyRigFlags == 0; }
-	U32 getLegacyRigFlags() const { return mLegacyRigFlags; }
-	void setLegacyRigFlags( U32 rigFlags ) { mLegacyRigFlags = rigFlags; }
-
-	static void	textureLoadedCallback( BOOL success, LLViewerFetchedTexture *src_vi, LLImageRaw* src, LLImageRaw* src_aux, S32 discard_level, BOOL final, void* userdata );
-    static bool lodQueryCallback();
-	
-	boost::signals2::connection setDetailsCallback( const details_signal_t::slot_type& cb ){  return mDetailsSignal.connect(cb);  }
-	boost::signals2::connection setModelLoadedCallback( const model_loaded_signal_t::slot_type& cb ){  return mModelLoadedSignal.connect(cb);  }
-	boost::signals2::connection setModelUpdatedCallback( const model_updated_signal_t::slot_type& cb ){  return mModelUpdatedSignal.connect(cb);  }
-	
-	void setLoadState( U32 state ) { mLoadState = state; }
-	U32 getLoadState() { return mLoadState; }
-	
-	static bool 		sIgnoreLoadedCallback;
-    std::vector<S32> mLodsQuery;
-    std::vector<S32> mLodsWithParsingError;
-	bool mHasDegenerate;
-
-protected:
-
-	static void			loadedCallback(LLModelLoader::scene& scene,LLModelLoader::model_list& model_list, S32 lod, void* opaque);
-	static void			stateChangedCallback(U32 state, void* opaque);
-
-	static LLJoint*	lookupJointByName(const std::string&, void* opaque);
-	static U32			loadTextures(LLImportMaterial& material, void* opaque);
-
-private:
-	//Utility function for controller vertex compare
-	bool verifyCount( int expected, int result );
-	//Creates the dummy avatar for the preview window
-	void		createPreviewAvatar( void );
-	//Accessor for the dummy avatar
-	LLVOAvatar* getPreviewAvatar( void ) { return mPreviewAvatar; }
-	// Count amount of original models, excluding sub-models
-	static U32 countRootModels(LLModelLoader::model_list models);
-
- protected:
-	friend class LLModelLoader;
-	friend class LLFloaterModelPreview;
-	friend class LLFloaterModelPreview::DecompRequest;
-	friend class LLPhysicsDecomp;
-
-	LLFloater*  mFMP;
-
-	BOOL        mNeedsUpdate;
-	bool		mDirty;
-	bool		mGenLOD;
-	U32         mTextureName;
-	F32			mCameraDistance;
-	F32			mCameraYaw;
-	F32			mCameraPitch;
-	F32			mCameraZoom;
-	LLVector3	mCameraOffset;
-	LLVector3	mPreviewTarget;
-	LLVector3	mPreviewScale;
-	S32			mPreviewLOD;
-	S32			mPhysicsSearchLOD;
-	U32			mResourceCost;
-	std::string mLODFile[LLModel::NUM_LODS];
-	bool		mLoading;
-	U32			mLoadState;
-	bool		mResetJoints;
-	bool		mModelNoErrors;
-
-	std::map<std::string, bool> mViewOption;
-
-	//GLOD object parameters (must rebuild object if these change)
-	bool mLODFrozen;
-	F32 mBuildShareTolerance;
-	U32 mBuildQueueMode;
-	U32 mBuildOperator;
-	U32 mBuildBorderMode;
-	U32 mRequestedLoDMode[LLModel::NUM_LODS];
-	S32 mRequestedTriangleCount[LLModel::NUM_LODS];
-	F32 mRequestedErrorThreshold[LLModel::NUM_LODS];
-	U32 mRequestedBuildOperator[LLModel::NUM_LODS];
-	U32 mRequestedQueueMode[LLModel::NUM_LODS];
-	U32 mRequestedBorderMode[LLModel::NUM_LODS];
-	F32 mRequestedShareTolerance[LLModel::NUM_LODS];
-	F32 mRequestedCreaseAngle[LLModel::NUM_LODS];
-
-	LLModelLoader* mModelLoader;
-
-	LLModelLoader::scene mScene[LLModel::NUM_LODS];
-	LLModelLoader::scene mBaseScene;
-
-	LLModelLoader::model_list mModel[LLModel::NUM_LODS];
-	LLModelLoader::model_list mBaseModel;
-
-	typedef std::vector<LLVolumeFace>		v_LLVolumeFace_t;
-	typedef std::vector<v_LLVolumeFace_t>	vv_LLVolumeFace_t;
-	
-	vv_LLVolumeFace_t mModelFacesCopy[LLModel::NUM_LODS];
-	vv_LLVolumeFace_t mBaseModelFacesCopy;
-
-	U32 mGroup;
-	std::map<LLPointer<LLModel>, U32> mObject;
-	U32 mMaxTriangleLimit;
-	
-	LLMeshUploadThread::instance_list mUploadData;
-	std::set<LLViewerFetchedTexture * > mTextureSet;
-
-	//map of vertex buffers to models (one vertex buffer in vector per face in model
-	std::map<LLModel*, std::vector<LLPointer<LLVertexBuffer> > > mVertexBuffer[LLModel::NUM_LODS+1];
-
-	details_signal_t mDetailsSignal;
-	model_loaded_signal_t mModelLoadedSignal;
-	model_updated_signal_t mModelUpdatedSignal;
-	
-	LLVector3	mModelPivot;
-	bool		mHasPivot;
-	
-	float		mPelvisZOffset;
-	
-	bool		mRigValidJointUpload;
-	U32			mLegacyRigFlags;
-
-	bool		mLastJointUpdate;
-
-	JointNameSet		mJointsFromNode;
-	JointTransformMap	mJointTransformMap;
-
-	LLPointer<LLVOAvatar>	mPreviewAvatar;
-	LLCachedControl<bool>	mImporterDebug;
-};
-
 #endif  // LL_LLFLOATERMODELPREVIEW_H
diff --git a/indra/newview/llmodelpreview.cpp b/indra/newview/llmodelpreview.cpp
new file mode 100644
index 0000000000..96af3b37d9
--- /dev/null
+++ b/indra/newview/llmodelpreview.cpp
@@ -0,0 +1,3507 @@
+/**
+ * @file llmodelpreview.cpp
+ * @brief LLModelPreview class implementation
+ *
+ * $LicenseInfo:firstyear=2020&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2020, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "llviewerprecompiledheaders.h"
+
+#include "llmodelloader.h"
+#include "lldaeloader.h"
+#include "llfloatermodelpreview.h"
+
+#include "llmodelpreview.h"
+
+#include "llimagebmp.h"
+#include "llimagetga.h"
+#include "llimagejpeg.h"
+#include "llimagepng.h"
+
+#include "llagent.h"
+#include "llanimationstates.h"
+#include "llcallbacklist.h"
+#include "lldatapacker.h"
+#include "lldrawable.h"
+#include "llface.h"
+#include "lliconctrl.h"
+#include "llmatrix4a.h"
+#include "llmeshrepository.h"
+#include "llrender.h"
+#include "llsdutil_math.h"
+#include "llskinningutil.h"
+#include "llstring.h"
+#include "llsdserialize.h"
+#include "lltoolmgr.h"
+#include "llui.h"
+#include "llvector4a.h"
+#include "llviewercamera.h"
+#include "llviewercontrol.h"
+#include "llviewerobjectlist.h"
+#include "llviewernetwork.h"
+#include "llviewershadermgr.h"
+#include "llviewertexteditor.h"
+#include "llviewertexturelist.h"
+#include "llvoavatar.h"
+#include "pipeline.h"
+
+// ui controls (from floater)
+#include "llbutton.h"
+#include "llcombobox.h"
+#include "llspinctrl.h"
+#include "lltabcontainer.h"
+#include "lltextbox.h"
+
+#include "glod/glod.h"
+#include <boost/algorithm/string.hpp>
+
+bool LLModelPreview::sIgnoreLoadedCallback = false;
+
+const F32 SKIN_WEIGHT_CAMERA_DISTANCE = 16.f;
+
+BOOL stop_gloderror()
+{
+    GLuint error = glodGetError();
+
+    if (error != GLOD_NO_ERROR)
+    {
+        LL_WARNS() << "GLOD error detected, cannot generate LOD: " << std::hex << error << LL_ENDL;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+LLViewerFetchedTexture* bindMaterialDiffuseTexture(const LLImportMaterial& material)
+{
+    LLViewerFetchedTexture *texture = LLViewerTextureManager::getFetchedTexture(material.getDiffuseMap(), FTT_DEFAULT, TRUE, LLGLTexture::BOOST_PREVIEW);
+
+    if (texture)
+    {
+        if (texture->getDiscardLevel() > -1)
+        {
+            gGL.getTexUnit(0)->bind(texture, true);
+            return texture;
+        }
+    }
+
+    return NULL;
+}
+
+std::string stripSuffix(std::string name)
+{
+    if ((name.find("_LOD") != -1) || (name.find("_PHYS") != -1))
+    {
+        return name.substr(0, name.rfind('_'));
+    }
+    return name;
+}
+
+void FindModel(LLModelLoader::scene& scene, const std::string& name_to_match, LLModel*& baseModelOut, LLMatrix4& matOut)
+{
+    LLModelLoader::scene::iterator base_iter = scene.begin();
+    bool found = false;
+    while (!found && (base_iter != scene.end()))
+    {
+        matOut = base_iter->first;
+
+        LLModelLoader::model_instance_list::iterator base_instance_iter = base_iter->second.begin();
+        while (!found && (base_instance_iter != base_iter->second.end()))
+        {
+            LLModelInstance& base_instance = *base_instance_iter++;
+            LLModel* base_model = base_instance.mModel;
+
+            if (base_model && (base_model->mLabel == name_to_match))
+            {
+                baseModelOut = base_model;
+                return;
+            }
+        }
+        base_iter++;
+    }
+}
+
+//-----------------------------------------------------------------------------
+// LLModelPreview
+//-----------------------------------------------------------------------------
+
+LLModelPreview::LLModelPreview(S32 width, S32 height, LLFloater* fmp)
+    : LLViewerDynamicTexture(width, height, 3, ORDER_MIDDLE, FALSE), LLMutex()
+    , mLodsQuery()
+    , mLodsWithParsingError()
+    , mPelvisZOffset(0.0f)
+    , mLegacyRigFlags(U32_MAX)
+    , mRigValidJointUpload(false)
+    , mPhysicsSearchLOD(LLModel::LOD_PHYSICS)
+    , mResetJoints(false)
+    , mModelNoErrors(true)
+    , mLastJointUpdate(false)
+    , mHasDegenerate(false)
+    , mImporterDebug(LLCachedControl<bool>(gSavedSettings, "ImporterDebug", false))
+{
+    mNeedsUpdate = TRUE;
+    mCameraDistance = 0.f;
+    mCameraYaw = 0.f;
+    mCameraPitch = 0.f;
+    mCameraZoom = 1.f;
+    mTextureName = 0;
+    mPreviewLOD = 0;
+    mModelLoader = NULL;
+    mMaxTriangleLimit = 0;
+    mDirty = false;
+    mGenLOD = false;
+    mLoading = false;
+    mLoadState = LLModelLoader::STARTING;
+    mGroup = 0;
+    mLODFrozen = false;
+    mBuildShareTolerance = 0.f;
+    mBuildQueueMode = GLOD_QUEUE_GREEDY;
+    mBuildBorderMode = GLOD_BORDER_UNLOCK;
+    mBuildOperator = GLOD_OPERATOR_EDGE_COLLAPSE;
+
+    for (U32 i = 0; i < LLModel::NUM_LODS; ++i)
+    {
+        mRequestedTriangleCount[i] = 0;
+        mRequestedCreaseAngle[i] = -1.f;
+        mRequestedLoDMode[i] = 0;
+        mRequestedErrorThreshold[i] = 0.f;
+        mRequestedBuildOperator[i] = 0;
+        mRequestedQueueMode[i] = 0;
+        mRequestedBorderMode[i] = 0;
+        mRequestedShareTolerance[i] = 0.f;
+    }
+
+    mViewOption["show_textures"] = false;
+
+    mFMP = fmp;
+
+    mHasPivot = false;
+    mModelPivot = LLVector3(0.0f, 0.0f, 0.0f);
+
+    glodInit();
+
+    createPreviewAvatar();
+}
+
+LLModelPreview::~LLModelPreview()
+{
+    // glod apparently has internal mem alignment issues that are angering
+    // the heap-check code in windows, these should be hunted down in that
+    // TP code, if possible
+    //
+    // kernel32.dll!HeapFree()  + 0x14 bytes	
+    // msvcr100.dll!free(void * pBlock)  Line 51	C
+    // glod.dll!glodGetGroupParameteriv()  + 0x119 bytes	
+    // glod.dll!glodShutdown()  + 0x77 bytes	
+    //
+    //glodShutdown();
+    if (mModelLoader)
+    {
+        mModelLoader->shutdown();
+    }
+}
+
+U32 LLModelPreview::calcResourceCost()
+{
+    assert_main_thread();
+
+    rebuildUploadData();
+
+    //Upload skin is selected BUT check to see if the joints coming in from the asset were malformed.
+    if (mFMP && mFMP->childGetValue("upload_skin").asBoolean())
+    {
+        bool uploadingJointPositions = mFMP->childGetValue("upload_joints").asBoolean();
+        if (uploadingJointPositions && !isRigValidForJointPositionUpload())
+        {
+            mFMP->childDisable("ok_btn");
+        }
+    }
+
+    std::set<LLModel*> accounted;
+    U32 num_points = 0;
+    U32 num_hulls = 0;
+
+    F32 debug_scale = mFMP ? mFMP->childGetValue("import_scale").asReal() : 1.f;
+    mPelvisZOffset = mFMP ? mFMP->childGetValue("pelvis_offset").asReal() : 3.0f;
+
+    if (mFMP && mFMP->childGetValue("upload_joints").asBoolean())
+    {
+        // FIXME if preview avatar ever gets reused, this fake mesh ID stuff will fail.
+        // see also call to addAttachmentPosOverride.
+        LLUUID fake_mesh_id;
+        fake_mesh_id.generate();
+        getPreviewAvatar()->addPelvisFixup(mPelvisZOffset, fake_mesh_id);
+    }
+
+    F32 streaming_cost = 0.f;
+    F32 physics_cost = 0.f;
+    for (U32 i = 0; i < mUploadData.size(); ++i)
+    {
+        LLModelInstance& instance = mUploadData[i];
+
+        if (accounted.find(instance.mModel) == accounted.end())
+        {
+            accounted.insert(instance.mModel);
+
+            LLModel::Decomposition& decomp =
+                instance.mLOD[LLModel::LOD_PHYSICS] ?
+                instance.mLOD[LLModel::LOD_PHYSICS]->mPhysics :
+                instance.mModel->mPhysics;
+
+            //update instance skin info for each lods pelvisZoffset 
+            for (int j = 0; j<LLModel::NUM_LODS; ++j)
+            {
+                if (instance.mLOD[j])
+                {
+                    instance.mLOD[j]->mSkinInfo.mPelvisOffset = mPelvisZOffset;
+                }
+            }
+
+            std::stringstream ostr;
+            LLSD ret = LLModel::writeModel(ostr,
+                instance.mLOD[4],
+                instance.mLOD[3],
+                instance.mLOD[2],
+                instance.mLOD[1],
+                instance.mLOD[0],
+                decomp,
+                mFMP->childGetValue("upload_skin").asBoolean(),
+                mFMP->childGetValue("upload_joints").asBoolean(),
+                mFMP->childGetValue("lock_scale_if_joint_position").asBoolean(),
+                TRUE,
+                FALSE,
+                instance.mModel->mSubmodelID);
+
+            num_hulls += decomp.mHull.size();
+            for (U32 i = 0; i < decomp.mHull.size(); ++i)
+            {
+                num_points += decomp.mHull[i].size();
+            }
+
+            //calculate streaming cost
+            LLMatrix4 transformation = instance.mTransform;
+
+            LLVector3 position = LLVector3(0, 0, 0) * transformation;
+
+            LLVector3 x_transformed = LLVector3(1, 0, 0) * transformation - position;
+            LLVector3 y_transformed = LLVector3(0, 1, 0) * transformation - position;
+            LLVector3 z_transformed = LLVector3(0, 0, 1) * transformation - position;
+            F32 x_length = x_transformed.normalize();
+            F32 y_length = y_transformed.normalize();
+            F32 z_length = z_transformed.normalize();
+            LLVector3 scale = LLVector3(x_length, y_length, z_length);
+
+            F32 radius = scale.length()*0.5f*debug_scale;
+
+            LLMeshCostData costs;
+            if (gMeshRepo.getCostData(ret, costs))
+            {
+                streaming_cost += costs.getRadiusBasedStreamingCost(radius);
+            }
+        }
+    }
+
+    F32 scale = mFMP ? mFMP->childGetValue("import_scale").asReal()*2.f : 2.f;
+
+    mDetailsSignal(mPreviewScale[0] * scale, mPreviewScale[1] * scale, mPreviewScale[2] * scale, streaming_cost, physics_cost);
+
+    updateStatusMessages();
+
+    return (U32)streaming_cost;
+}
+
+void LLModelPreview::rebuildUploadData()
+{
+    assert_main_thread();
+
+    mUploadData.clear();
+    mTextureSet.clear();
+
+    //fill uploaddata instance vectors from scene data
+
+    std::string requested_name = mFMP->getChild<LLUICtrl>("description_form")->getValue().asString();
+
+    LLSpinCtrl* scale_spinner = mFMP->getChild<LLSpinCtrl>("import_scale");
+
+    F32 scale = scale_spinner->getValue().asReal();
+
+    LLMatrix4 scale_mat;
+    scale_mat.initScale(LLVector3(scale, scale, scale));
+
+    F32 max_scale = 0.f;
+
+    BOOL legacyMatching = gSavedSettings.getBOOL("ImporterLegacyMatching");
+
+    for (LLModelLoader::scene::iterator iter = mBaseScene.begin(); iter != mBaseScene.end(); ++iter)
+    { //for each transform in scene
+        LLMatrix4 mat = iter->first;
+
+        // compute position
+        LLVector3 position = LLVector3(0, 0, 0) * mat;
+
+        // compute scale
+        LLVector3 x_transformed = LLVector3(1, 0, 0) * mat - position;
+        LLVector3 y_transformed = LLVector3(0, 1, 0) * mat - position;
+        LLVector3 z_transformed = LLVector3(0, 0, 1) * mat - position;
+        F32 x_length = x_transformed.normalize();
+        F32 y_length = y_transformed.normalize();
+        F32 z_length = z_transformed.normalize();
+
+        max_scale = llmax(llmax(llmax(max_scale, x_length), y_length), z_length);
+
+        mat *= scale_mat;
+
+        for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end();)
+        { //for each instance with said transform applied 
+            LLModelInstance instance = *model_iter++;
+
+            LLModel* base_model = instance.mModel;
+
+            if (base_model && !requested_name.empty())
+            {
+                base_model->mRequestedLabel = requested_name;
+            }
+
+            for (int i = LLModel::NUM_LODS - 1; i >= LLModel::LOD_IMPOSTOR; i--)
+            {
+                LLModel* lod_model = NULL;
+                if (!legacyMatching)
+                {
+                    // Fill LOD slots by finding matching meshes by label with name extensions
+                    // in the appropriate scene for each LOD. This fixes all kinds of issues
+                    // where the indexed method below fails in spectacular fashion.
+                    // If you don't take the time to name your LOD and PHYS meshes
+                    // with the name of their corresponding mesh in the HIGH LOD,
+                    // then the indexed method will be attempted below.
+
+                    LLMatrix4 transform;
+
+                    std::string name_to_match = instance.mLabel;
+                    llassert(!name_to_match.empty());
+
+                    int extensionLOD;
+                    if (i != LLModel::LOD_PHYSICS || mModel[LLModel::LOD_PHYSICS].empty())
+                    {
+                        extensionLOD = i;
+                    }
+                    else
+                    {
+                        //Physics can be inherited from other LODs or loaded, so we need to adjust what extension we are searching for
+                        extensionLOD = mPhysicsSearchLOD;
+                    }
+
+                    std::string toAdd;
+                    switch (extensionLOD)
+                    {
+                    case LLModel::LOD_IMPOSTOR: toAdd = "_LOD0"; break;
+                    case LLModel::LOD_LOW:      toAdd = "_LOD1"; break;
+                    case LLModel::LOD_MEDIUM:   toAdd = "_LOD2"; break;
+                    case LLModel::LOD_PHYSICS:  toAdd = "_PHYS"; break;
+                    case LLModel::LOD_HIGH:                      break;
+                    }
+
+                    if (name_to_match.find(toAdd) == -1)
+                    {
+                        name_to_match += toAdd;
+                    }
+
+                    FindModel(mScene[i], name_to_match, lod_model, transform);
+
+                    if (!lod_model && i != LLModel::LOD_PHYSICS)
+                    {
+                        if (mImporterDebug)
+                        {
+                            std::ostringstream out;
+                            out << "Search of" << name_to_match;
+                            out << " in LOD" << i;
+                            out << " list failed. Searching for alternative among LOD lists.";
+                            LL_INFOS() << out.str() << LL_ENDL;
+                            LLFloaterModelPreview::addStringToLog(out, false);
+                        }
+
+                        int searchLOD = (i > LLModel::LOD_HIGH) ? LLModel::LOD_HIGH : i;
+                        while ((searchLOD <= LLModel::LOD_HIGH) && !lod_model)
+                        {
+                            std::string name_to_match = instance.mLabel;
+                            llassert(!name_to_match.empty());
+
+                            std::string toAdd;
+                            switch (searchLOD)
+                            {
+                            case LLModel::LOD_IMPOSTOR: toAdd = "_LOD0"; break;
+                            case LLModel::LOD_LOW:      toAdd = "_LOD1"; break;
+                            case LLModel::LOD_MEDIUM:   toAdd = "_LOD2"; break;
+                            case LLModel::LOD_PHYSICS:  toAdd = "_PHYS"; break;
+                            case LLModel::LOD_HIGH:                      break;
+                            }
+
+                            if (name_to_match.find(toAdd) == -1)
+                            {
+                                name_to_match += toAdd;
+                            }
+
+                            // See if we can find an appropriately named model in LOD 'searchLOD'
+                            //
+                            FindModel(mScene[searchLOD], name_to_match, lod_model, transform);
+                            searchLOD++;
+                        }
+                    }
+                }
+                else
+                {
+                    // Use old method of index-based association
+                    U32 idx = 0;
+                    for (idx = 0; idx < mBaseModel.size(); ++idx)
+                    {
+                        // find reference instance for this model
+                        if (mBaseModel[idx] == base_model)
+                        {
+                            if (mImporterDebug)
+                            {
+                                std::ostringstream out;
+                                out << "Attempting to use model index " << idx;
+                                out << " for LOD" << i;
+                                out << " of " << instance.mLabel;
+                                LL_INFOS() << out.str() << LL_ENDL;
+                                LLFloaterModelPreview::addStringToLog(out, false);
+                            }
+                            break;
+                        }
+                    }
+
+                    // If the model list for the current LOD includes that index...
+                    //
+                    if (mModel[i].size() > idx)
+                    {
+                        // Assign that index from the model list for our LOD as the LOD model for this instance
+                        //
+                        lod_model = mModel[i][idx];
+                        if (mImporterDebug)
+                        {
+                            std::ostringstream out;
+                            out << "Indexed match of model index " << idx << " at LOD " << i << " to model named " << lod_model->mLabel;
+                            LL_INFOS() << out.str() << LL_ENDL;
+                            LLFloaterModelPreview::addStringToLog(out, false);
+                        }
+                    }
+                    else if (mImporterDebug)
+                    {
+                        std::ostringstream out;
+                        out << "List of models does not include index " << idx;
+                        LL_INFOS() << out.str() << LL_ENDL;
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                    }
+                }
+
+                if (lod_model)
+                {
+                    if (mImporterDebug)
+                    {
+                        std::ostringstream out;
+                        if (i == LLModel::LOD_PHYSICS)
+                        {
+                            out << "Assigning collision for " << instance.mLabel << " to match " << lod_model->mLabel;
+                        }
+                        else
+                        {
+                            out << "Assigning LOD" << i << " for " << instance.mLabel << " to found match " << lod_model->mLabel;
+                        }
+                        LL_INFOS() << out.str() << LL_ENDL;
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                    }
+                    instance.mLOD[i] = lod_model;
+                }
+                else
+                {
+                    if (i < LLModel::LOD_HIGH && !lodsReady())
+                    {
+                        // assign a placeholder from previous LOD until lod generation is complete.
+                        // Note: we might need to assign it regardless of conditions like named search does, to prevent crashes.
+                        instance.mLOD[i] = instance.mLOD[i + 1];
+                    }
+                    if (mImporterDebug)
+                    {
+                        std::ostringstream out;
+                        out << "List of models does not include " << instance.mLabel;
+                        LL_INFOS() << out.str() << LL_ENDL;
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                    }
+                }
+            }
+
+            LLModel* high_lod_model = instance.mLOD[LLModel::LOD_HIGH];
+            if (!high_lod_model)
+            {
+                setLoadState(LLModelLoader::ERROR_MATERIALS);
+                mFMP->childDisable("calculate_btn");
+            }
+            else
+            {
+                for (U32 i = 0; i < LLModel::NUM_LODS - 1; i++)
+                {
+                    int refFaceCnt = 0;
+                    int modelFaceCnt = 0;
+                    llassert(instance.mLOD[i]);
+                    if (instance.mLOD[i] && !instance.mLOD[i]->matchMaterialOrder(high_lod_model, refFaceCnt, modelFaceCnt))
+                    {
+                        setLoadState(LLModelLoader::ERROR_MATERIALS);
+                        mFMP->childDisable("calculate_btn");
+                    }
+                }
+                LLFloaterModelPreview* fmp = (LLFloaterModelPreview*)mFMP;
+                bool upload_skinweights = fmp && fmp->childGetValue("upload_skin").asBoolean();
+                if (upload_skinweights && high_lod_model->mSkinInfo.mJointNames.size() > 0)
+                {
+                    LLQuaternion bind_rot = LLSkinningUtil::getUnscaledQuaternion(high_lod_model->mSkinInfo.mBindShapeMatrix);
+                    LLQuaternion identity;
+                    if (!bind_rot.isEqualEps(identity, 0.01))
+                    {
+                        std::ostringstream out;
+                        out << "non-identity bind shape rot. mat is ";
+                        out << high_lod_model->mSkinInfo.mBindShapeMatrix;
+                        out << " bind_rot ";
+                        out << bind_rot;
+                        LL_WARNS() << out.str() << LL_ENDL;
+
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                        setLoadState(LLModelLoader::WARNING_BIND_SHAPE_ORIENTATION);
+                    }
+                }
+            }
+            instance.mTransform = mat;
+            mUploadData.push_back(instance);
+        }
+    }
+
+    for (U32 lod = 0; lod < LLModel::NUM_LODS - 1; lod++)
+    {
+        // Search for models that are not included into upload data
+        // If we found any, that means something we loaded is not a sub-model.
+        for (U32 model_ind = 0; model_ind < mModel[lod].size(); ++model_ind)
+        {
+            bool found_model = false;
+            for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
+            {
+                LLModelInstance& instance = *iter;
+                if (instance.mLOD[lod] == mModel[lod][model_ind])
+                {
+                    found_model = true;
+                    break;
+                }
+            }
+            if (!found_model && mModel[lod][model_ind] && !mModel[lod][model_ind]->mSubmodelID)
+            {
+                if (mImporterDebug)
+                {
+                    std::ostringstream out;
+                    out << "Model " << mModel[lod][model_ind]->mLabel << " was not used - mismatching lod models.";
+                    LL_INFOS() << out.str() << LL_ENDL;
+                    LLFloaterModelPreview::addStringToLog(out, false);
+                }
+                setLoadState(LLModelLoader::ERROR_MATERIALS);
+                mFMP->childDisable("calculate_btn");
+            }
+        }
+    }
+
+    F32 max_import_scale = (DEFAULT_MAX_PRIM_SCALE - 0.1f) / max_scale;
+
+    F32 max_axis = llmax(mPreviewScale.mV[0], mPreviewScale.mV[1]);
+    max_axis = llmax(max_axis, mPreviewScale.mV[2]);
+    max_axis *= 2.f;
+
+    //clamp scale so that total imported model bounding box is smaller than 240m on a side
+    max_import_scale = llmin(max_import_scale, 240.f / max_axis);
+
+    scale_spinner->setMaxValue(max_import_scale);
+
+    if (max_import_scale < scale)
+    {
+        scale_spinner->setValue(max_import_scale);
+    }
+
+}
+
+void LLModelPreview::saveUploadData(bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position)
+{
+    if (!mLODFile[LLModel::LOD_HIGH].empty())
+    {
+        std::string filename = mLODFile[LLModel::LOD_HIGH];
+        std::string slm_filename;
+
+        if (LLModelLoader::getSLMFilename(filename, slm_filename))
+        {
+            saveUploadData(slm_filename, save_skinweights, save_joint_positions, lock_scale_if_joint_position);
+        }
+    }
+}
+
+void LLModelPreview::saveUploadData(const std::string& filename,
+    bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position)
+{
+
+    std::set<LLPointer<LLModel> > meshes;
+    std::map<LLModel*, std::string> mesh_binary;
+
+    LLModel::hull empty_hull;
+
+    LLSD data;
+
+    data["version"] = SLM_SUPPORTED_VERSION;
+    if (!mBaseModel.empty())
+    {
+        data["name"] = mBaseModel[0]->getName();
+    }
+
+    S32 mesh_id = 0;
+
+    //build list of unique models and initialize local id
+    for (U32 i = 0; i < mUploadData.size(); ++i)
+    {
+        LLModelInstance& instance = mUploadData[i];
+
+        if (meshes.find(instance.mModel) == meshes.end())
+        {
+            instance.mModel->mLocalID = mesh_id++;
+            meshes.insert(instance.mModel);
+
+            std::stringstream str;
+            LLModel::Decomposition& decomp =
+                instance.mLOD[LLModel::LOD_PHYSICS].notNull() ?
+                instance.mLOD[LLModel::LOD_PHYSICS]->mPhysics :
+                instance.mModel->mPhysics;
+
+            LLModel::writeModel(str,
+                instance.mLOD[LLModel::LOD_PHYSICS],
+                instance.mLOD[LLModel::LOD_HIGH],
+                instance.mLOD[LLModel::LOD_MEDIUM],
+                instance.mLOD[LLModel::LOD_LOW],
+                instance.mLOD[LLModel::LOD_IMPOSTOR],
+                decomp,
+                save_skinweights,
+                save_joint_positions,
+                lock_scale_if_joint_position,
+                FALSE, TRUE, instance.mModel->mSubmodelID);
+
+            data["mesh"][instance.mModel->mLocalID] = str.str();
+        }
+
+        data["instance"][i] = instance.asLLSD();
+    }
+
+    llofstream out(filename.c_str(), std::ios_base::out | std::ios_base::binary);
+    LLSDSerialize::toBinary(data, out);
+    out.flush();
+    out.close();
+}
+
+void LLModelPreview::clearModel(S32 lod)
+{
+    if (lod < 0 || lod > LLModel::LOD_PHYSICS)
+    {
+        return;
+    }
+
+    mVertexBuffer[lod].clear();
+    mModel[lod].clear();
+    mScene[lod].clear();
+}
+
+void LLModelPreview::getJointAliases(JointMap& joint_map)
+{
+    // Get all standard skeleton joints from the preview avatar.
+    LLVOAvatar *av = getPreviewAvatar();
+
+    //Joint names and aliases come from avatar_skeleton.xml
+
+    joint_map = av->getJointAliases();
+
+    std::vector<std::string> cv_names, attach_names;
+    av->getSortedJointNames(1, cv_names);
+    av->getSortedJointNames(2, attach_names);
+    for (std::vector<std::string>::iterator it = cv_names.begin(); it != cv_names.end(); ++it)
+    {
+        joint_map[*it] = *it;
+    }
+    for (std::vector<std::string>::iterator it = attach_names.begin(); it != attach_names.end(); ++it)
+    {
+        joint_map[*it] = *it;
+    }
+}
+
+void LLModelPreview::loadModel(std::string filename, S32 lod, bool force_disable_slm)
+{
+    assert_main_thread();
+
+    LLMutexLock lock(this);
+
+    if (lod < LLModel::LOD_IMPOSTOR || lod > LLModel::NUM_LODS - 1)
+    {
+        std::ostringstream out;
+        out << "Invalid level of detail: ";
+        out << lod;
+        LL_WARNS() << out.str() << LL_ENDL;
+        LLFloaterModelPreview::addStringToLog(out, true);
+        assert(lod >= LLModel::LOD_IMPOSTOR && lod < LLModel::NUM_LODS);
+        return;
+    }
+
+    // This triggers if you bring up the file picker and then hit CANCEL.
+    // Just use the previous model (if any) and ignore that you brought up
+    // the file picker.
+
+    if (filename.empty())
+    {
+        if (mBaseModel.empty())
+        {
+            // this is the initial file picking. Close the whole floater
+            // if we don't have a base model to show for high LOD.
+            mFMP->closeFloater(false);
+        }
+        mLoading = false;
+        return;
+    }
+
+    if (mModelLoader)
+    {
+        LL_WARNS() << "Incompleted model load operation pending." << LL_ENDL;
+        return;
+    }
+
+    mLODFile[lod] = filename;
+
+    if (lod == LLModel::LOD_HIGH)
+    {
+        clearGLODGroup();
+    }
+
+    std::map<std::string, std::string> joint_alias_map;
+    getJointAliases(joint_alias_map);
+
+    mModelLoader = new LLDAELoader(
+        filename,
+        lod,
+        &LLModelPreview::loadedCallback,
+        &LLModelPreview::lookupJointByName,
+        &LLModelPreview::loadTextures,
+        &LLModelPreview::stateChangedCallback,
+        this,
+        mJointTransformMap,
+        mJointsFromNode,
+        joint_alias_map,
+        LLSkinningUtil::getMaxJointCount(),
+        gSavedSettings.getU32("ImporterModelLimit"),
+        gSavedSettings.getBOOL("ImporterPreprocessDAE"));
+
+    if (force_disable_slm)
+    {
+        mModelLoader->mTrySLM = false;
+    }
+    else
+    {
+        // For MAINT-6647, we have set force_disable_slm to true,
+        // which means this code path will never be taken. Trying to
+        // re-use SLM files has never worked properly; in particular,
+        // it tends to force the UI into strange checkbox options
+        // which cannot be altered.
+
+        //only try to load from slm if viewer is configured to do so and this is the 
+        //initial model load (not an LoD or physics shape)
+        mModelLoader->mTrySLM = gSavedSettings.getBOOL("MeshImportUseSLM") && mUploadData.empty();
+    }
+    mModelLoader->start();
+
+    mFMP->childSetTextArg("status", "[STATUS]", mFMP->getString("status_reading_file"));
+
+    setPreviewLOD(lod);
+
+    if (getLoadState() >= LLModelLoader::ERROR_PARSING)
+    {
+        mFMP->childDisable("ok_btn");
+        mFMP->childDisable("calculate_btn");
+    }
+
+    if (lod == mPreviewLOD)
+    {
+        mFMP->childSetValue("lod_file_" + lod_name[lod], mLODFile[lod]);
+    }
+    else if (lod == LLModel::LOD_PHYSICS)
+    {
+        mFMP->childSetValue("physics_file", mLODFile[lod]);
+    }
+
+    mFMP->openFloater();
+}
+
+void LLModelPreview::setPhysicsFromLOD(S32 lod)
+{
+    assert_main_thread();
+
+    if (lod >= 0 && lod <= 3)
+    {
+        mPhysicsSearchLOD = lod;
+        mModel[LLModel::LOD_PHYSICS] = mModel[lod];
+        mScene[LLModel::LOD_PHYSICS] = mScene[lod];
+        mLODFile[LLModel::LOD_PHYSICS].clear();
+        mFMP->childSetValue("physics_file", mLODFile[LLModel::LOD_PHYSICS]);
+        mVertexBuffer[LLModel::LOD_PHYSICS].clear();
+        rebuildUploadData();
+        refresh();
+        updateStatusMessages();
+    }
+}
+
+void LLModelPreview::clearIncompatible(S32 lod)
+{
+    //Don't discard models if specified model is the physic rep
+    if (lod == LLModel::LOD_PHYSICS)
+    {
+        return;
+    }
+
+    // at this point we don't care about sub-models,
+    // different amount of sub-models means face count mismatch, not incompatibility
+    U32 lod_size = countRootModels(mModel[lod]);
+    for (U32 i = 0; i <= LLModel::LOD_HIGH; i++)
+    { //clear out any entries that aren't compatible with this model
+        if (i != lod)
+        {
+            if (countRootModels(mModel[i]) != lod_size)
+            {
+                mModel[i].clear();
+                mScene[i].clear();
+                mVertexBuffer[i].clear();
+
+                if (i == LLModel::LOD_HIGH)
+                {
+                    mBaseModel = mModel[lod];
+                    clearGLODGroup();
+                    mBaseScene = mScene[lod];
+                    mVertexBuffer[5].clear();
+                }
+            }
+        }
+    }
+}
+
+void LLModelPreview::clearGLODGroup()
+{
+    if (mGroup)
+    {
+        for (std::map<LLPointer<LLModel>, U32>::iterator iter = mObject.begin(); iter != mObject.end(); ++iter)
+        {
+            glodDeleteObject(iter->second);
+            stop_gloderror();
+        }
+        mObject.clear();
+
+        glodDeleteGroup(mGroup);
+        stop_gloderror();
+        mGroup = 0;
+    }
+}
+
+void LLModelPreview::loadModelCallback(S32 loaded_lod)
+{
+    assert_main_thread();
+
+    LLMutexLock lock(this);
+    if (!mModelLoader)
+    {
+        mLoading = false;
+        return;
+    }
+    if (getLoadState() >= LLModelLoader::ERROR_PARSING)
+    {
+        mLoading = false;
+        mModelLoader = NULL;
+        mLodsWithParsingError.push_back(loaded_lod);
+        return;
+    }
+
+    mLodsWithParsingError.erase(std::remove(mLodsWithParsingError.begin(), mLodsWithParsingError.end(), loaded_lod), mLodsWithParsingError.end());
+    if (mLodsWithParsingError.empty())
+    {
+        mFMP->childEnable("calculate_btn");
+    }
+
+    // Copy determinations about rig so UI will reflect them
+    //
+    setRigValidForJointPositionUpload(mModelLoader->isRigValidForJointPositionUpload());
+    setLegacyRigFlags(mModelLoader->getLegacyRigFlags());
+
+    mModelLoader->loadTextures();
+
+    if (loaded_lod == -1)
+    { //populate all LoDs from model loader scene
+        mBaseModel.clear();
+        mBaseScene.clear();
+
+        bool skin_weights = false;
+        bool joint_overrides = false;
+        bool lock_scale_if_joint_position = false;
+
+        for (S32 lod = 0; lod < LLModel::NUM_LODS; ++lod)
+        { //for each LoD
+
+            //clear scene and model info
+            mScene[lod].clear();
+            mModel[lod].clear();
+            mVertexBuffer[lod].clear();
+
+            if (mModelLoader->mScene.begin()->second[0].mLOD[lod].notNull())
+            { //if this LoD exists in the loaded scene
+
+                //copy scene to current LoD
+                mScene[lod] = mModelLoader->mScene;
+
+                //touch up copied scene to look like current LoD
+                for (LLModelLoader::scene::iterator iter = mScene[lod].begin(); iter != mScene[lod].end(); ++iter)
+                {
+                    LLModelLoader::model_instance_list& list = iter->second;
+
+                    for (LLModelLoader::model_instance_list::iterator list_iter = list.begin(); list_iter != list.end(); ++list_iter)
+                    {
+                        //override displayed model with current LoD
+                        list_iter->mModel = list_iter->mLOD[lod];
+
+                        if (!list_iter->mModel)
+                        {
+                            continue;
+                        }
+
+                        //add current model to current LoD's model list (LLModel::mLocalID makes a good vector index)
+                        S32 idx = list_iter->mModel->mLocalID;
+
+                        if (mModel[lod].size() <= idx)
+                        { //stretch model list to fit model at given index
+                            mModel[lod].resize(idx + 1);
+                        }
+
+                        mModel[lod][idx] = list_iter->mModel;
+                        if (!list_iter->mModel->mSkinWeights.empty())
+                        {
+                            skin_weights = true;
+
+                            if (!list_iter->mModel->mSkinInfo.mAlternateBindMatrix.empty())
+                            {
+                                joint_overrides = true;
+                            }
+                            if (list_iter->mModel->mSkinInfo.mLockScaleIfJointPosition)
+                            {
+                                lock_scale_if_joint_position = true;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if (mFMP)
+        {
+            LLFloaterModelPreview* fmp = (LLFloaterModelPreview*)mFMP;
+
+            if (skin_weights)
+            { //enable uploading/previewing of skin weights if present in .slm file
+                fmp->enableViewOption("show_skin_weight");
+                mViewOption["show_skin_weight"] = true;
+                fmp->childSetValue("upload_skin", true);
+            }
+
+            if (joint_overrides)
+            {
+                fmp->enableViewOption("show_joint_overrides");
+                mViewOption["show_joint_overrides"] = true;
+                fmp->enableViewOption("show_joint_positions");
+                mViewOption["show_joint_positions"] = true;
+                fmp->childSetValue("upload_joints", true);
+            }
+            else
+            {
+                fmp->clearAvatarTab();
+            }
+
+            if (lock_scale_if_joint_position)
+            {
+                fmp->enableViewOption("lock_scale_if_joint_position");
+                mViewOption["lock_scale_if_joint_position"] = true;
+                fmp->childSetValue("lock_scale_if_joint_position", true);
+            }
+        }
+
+        //copy high lod to base scene for LoD generation
+        mBaseScene = mScene[LLModel::LOD_HIGH];
+        mBaseModel = mModel[LLModel::LOD_HIGH];
+
+        mDirty = true;
+        resetPreviewTarget();
+    }
+    else
+    { //only replace given LoD
+        mModel[loaded_lod] = mModelLoader->mModelList;
+        mScene[loaded_lod] = mModelLoader->mScene;
+        mVertexBuffer[loaded_lod].clear();
+
+        setPreviewLOD(loaded_lod);
+
+        if (loaded_lod == LLModel::LOD_HIGH)
+        { //save a copy of the highest LOD for automatic LOD manipulation
+            if (mBaseModel.empty())
+            { //first time we've loaded a model, auto-gen LoD
+                mGenLOD = true;
+            }
+
+            mBaseModel = mModel[loaded_lod];
+            clearGLODGroup();
+
+            mBaseScene = mScene[loaded_lod];
+            mVertexBuffer[5].clear();
+        }
+        else
+        {
+            BOOL legacyMatching = gSavedSettings.getBOOL("ImporterLegacyMatching");
+            if (!legacyMatching)
+            {
+                if (!mBaseModel.empty())
+                {
+                    BOOL name_based = FALSE;
+                    BOOL has_submodels = FALSE;
+                    for (U32 idx = 0; idx < mBaseModel.size(); ++idx)
+                    {
+                        if (mBaseModel[idx]->mSubmodelID)
+                        { // don't do index-based renaming when the base model has submodels
+                            has_submodels = TRUE;
+                            if (mImporterDebug)
+                            {
+                                std::ostringstream out;
+                                out << "High LOD has submodels";
+                                LL_INFOS() << out.str() << LL_ENDL;
+                                LLFloaterModelPreview::addStringToLog(out, false);
+                            }
+                            break;
+                        }
+                    }
+
+                    for (U32 idx = 0; idx < mModel[loaded_lod].size(); ++idx)
+                    {
+                        std::string loaded_name = stripSuffix(mModel[loaded_lod][idx]->mLabel);
+
+                        LLModel* found_model = NULL;
+                        LLMatrix4 transform;
+                        FindModel(mBaseScene, loaded_name, found_model, transform);
+                        if (found_model)
+                        { // don't rename correctly named models (even if they are placed in a wrong order)
+                            name_based = TRUE;
+                        }
+
+                        if (mModel[loaded_lod][idx]->mSubmodelID)
+                        { // don't rename the models when loaded LOD model has submodels
+                            has_submodels = TRUE;
+                        }
+                    }
+
+                    if (mImporterDebug)
+                    {
+                        std::ostringstream out;
+                        out << "Loaded LOD " << loaded_lod << ": correct names" << (name_based ? "" : "NOT ") << "found; submodels " << (has_submodels ? "" : "NOT ") << "found";
+                        LL_INFOS() << out.str() << LL_ENDL;
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                    }
+
+                    if (!name_based && !has_submodels)
+                    { // replace the name of the model loaded for any non-HIGH LOD to match the others (MAINT-5601)
+                        // this actually works like "ImporterLegacyMatching" for this particular LOD
+                        for (U32 idx = 0; idx < mModel[loaded_lod].size() && idx < mBaseModel.size(); ++idx)
+                        {
+                            std::string name = mBaseModel[idx]->mLabel;
+                            std::string loaded_name = stripSuffix(mModel[loaded_lod][idx]->mLabel);
+
+                            if (loaded_name != name)
+                            {
+                                switch (loaded_lod)
+                                {
+                                case LLModel::LOD_IMPOSTOR: name += "_LOD0"; break;
+                                case LLModel::LOD_LOW:      name += "_LOD1"; break;
+                                case LLModel::LOD_MEDIUM:   name += "_LOD2"; break;
+                                case LLModel::LOD_PHYSICS:  name += "_PHYS"; break;
+                                case LLModel::LOD_HIGH:                      break;
+                                }
+
+                                if (mImporterDebug)
+                                {
+                                    std::ostringstream out;
+                                    out << "Loded model name " << mModel[loaded_lod][idx]->mLabel;
+                                    out << " for LOD " << loaded_lod;
+                                    out << " doesn't match the base model. Renaming to " << name;
+                                    LL_WARNS() << out.str() << LL_ENDL;
+                                    LLFloaterModelPreview::addStringToLog(out, false);
+                                }
+
+                                mModel[loaded_lod][idx]->mLabel = name;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        clearIncompatible(loaded_lod);
+
+        mDirty = true;
+
+        if (loaded_lod == LLModel::LOD_HIGH)
+        {
+            resetPreviewTarget();
+        }
+    }
+
+    mLoading = false;
+    if (mFMP)
+    {
+        if (!mBaseModel.empty())
+        {
+            const std::string& model_name = mBaseModel[0]->getName();
+            LLLineEditor* description_form = mFMP->getChild<LLLineEditor>("description_form");
+            if (description_form->getText().empty())
+            {
+                description_form->setText(model_name);
+            }
+            // Add info to log that loading is complete (purpose: separator between loading and other logs)
+            LLSD args;
+            args["MODEL_NAME"] = model_name; // Teoretically shouldn't be empty, but might be better idea to add filename here
+            LLFloaterModelPreview::addStringToLog("ModelLoaded", args, false, loaded_lod);
+        }
+    }
+    refresh();
+
+    mModelLoadedSignal();
+
+    mModelLoader = NULL;
+}
+
+void LLModelPreview::resetPreviewTarget()
+{
+    if (mModelLoader)
+    {
+        mPreviewTarget = (mModelLoader->mExtents[0] + mModelLoader->mExtents[1]) * 0.5f;
+        mPreviewScale = (mModelLoader->mExtents[1] - mModelLoader->mExtents[0]) * 0.5f;
+    }
+
+    setPreviewTarget(mPreviewScale.magVec()*10.f);
+}
+
+void LLModelPreview::generateNormals()
+{
+    assert_main_thread();
+
+    S32 which_lod = mPreviewLOD;
+
+    if (which_lod > 4 || which_lod < 0 ||
+        mModel[which_lod].empty())
+    {
+        return;
+    }
+
+    F32 angle_cutoff = mFMP->childGetValue("crease_angle").asReal();
+
+    mRequestedCreaseAngle[which_lod] = angle_cutoff;
+
+    angle_cutoff *= DEG_TO_RAD;
+
+    if (which_lod == 3 && !mBaseModel.empty())
+    {
+        if (mBaseModelFacesCopy.empty())
+        {
+            mBaseModelFacesCopy.reserve(mBaseModel.size());
+            for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it)
+            {
+                v_LLVolumeFace_t faces;
+                (*it)->copyFacesTo(faces);
+                mBaseModelFacesCopy.push_back(faces);
+            }
+        }
+
+        for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it)
+        {
+            (*it)->generateNormals(angle_cutoff);
+        }
+
+        mVertexBuffer[5].clear();
+    }
+
+    bool perform_copy = mModelFacesCopy[which_lod].empty();
+    if (perform_copy) {
+        mModelFacesCopy[which_lod].reserve(mModel[which_lod].size());
+    }
+
+    for (LLModelLoader::model_list::iterator it = mModel[which_lod].begin(), itE = mModel[which_lod].end(); it != itE; ++it)
+    {
+        if (perform_copy)
+        {
+            v_LLVolumeFace_t faces;
+            (*it)->copyFacesTo(faces);
+            mModelFacesCopy[which_lod].push_back(faces);
+        }
+
+        (*it)->generateNormals(angle_cutoff);
+    }
+
+    mVertexBuffer[which_lod].clear();
+    refresh();
+    updateStatusMessages();
+}
+
+void LLModelPreview::restoreNormals()
+{
+    S32 which_lod = mPreviewLOD;
+
+    if (which_lod > 4 || which_lod < 0 ||
+        mModel[which_lod].empty())
+    {
+        return;
+    }
+
+    if (!mBaseModelFacesCopy.empty())
+    {
+        llassert(mBaseModelFacesCopy.size() == mBaseModel.size());
+
+        vv_LLVolumeFace_t::const_iterator itF = mBaseModelFacesCopy.begin();
+        for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it, ++itF)
+        {
+            (*it)->copyFacesFrom((*itF));
+        }
+
+        mBaseModelFacesCopy.clear();
+    }
+
+    if (!mModelFacesCopy[which_lod].empty())
+    {
+        vv_LLVolumeFace_t::const_iterator itF = mModelFacesCopy[which_lod].begin();
+        for (LLModelLoader::model_list::iterator it = mModel[which_lod].begin(), itE = mModel[which_lod].end(); it != itE; ++it, ++itF)
+        {
+            (*it)->copyFacesFrom((*itF));
+        }
+
+        mModelFacesCopy[which_lod].clear();
+    }
+
+    mVertexBuffer[which_lod].clear();
+    refresh();
+    updateStatusMessages();
+}
+
+void LLModelPreview::genLODs(S32 which_lod, U32 decimation, bool enforce_tri_limit)
+{
+    // Allow LoD from -1 to LLModel::LOD_PHYSICS
+    if (which_lod < -1 || which_lod > LLModel::NUM_LODS - 1)
+    {
+        std::ostringstream out;
+        out << "Invalid level of detail: " << which_lod;
+        LL_WARNS() << out.str() << LL_ENDL;
+        LLFloaterModelPreview::addStringToLog(out, false);
+        assert(which_lod >= -1 && which_lod < LLModel::NUM_LODS);
+        return;
+    }
+
+    if (mBaseModel.empty())
+    {
+        return;
+    }
+
+    LLVertexBuffer::unbind();
+
+    bool no_ff = LLGLSLShader::sNoFixedFunction;
+    LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
+    LLGLSLShader::sNoFixedFunction = false;
+
+    if (shader)
+    {
+        shader->unbind();
+    }
+
+    stop_gloderror();
+    static U32 cur_name = 1;
+
+    S32 limit = -1;
+
+    U32 triangle_count = 0;
+
+    U32 instanced_triangle_count = 0;
+
+    //get the triangle count for the whole scene
+    for (LLModelLoader::scene::iterator iter = mBaseScene.begin(), endIter = mBaseScene.end(); iter != endIter; ++iter)
+    {
+        for (LLModelLoader::model_instance_list::iterator instance = iter->second.begin(), end_instance = iter->second.end(); instance != end_instance; ++instance)
+        {
+            LLModel* mdl = instance->mModel;
+            if (mdl)
+            {
+                instanced_triangle_count += mdl->getNumTriangles();
+            }
+        }
+    }
+
+    //get the triangle count for the non-instanced set of models
+    for (U32 i = 0; i < mBaseModel.size(); ++i)
+    {
+        triangle_count += mBaseModel[i]->getNumTriangles();
+    }
+
+    //get ratio of uninstanced triangles to instanced triangles
+    F32 triangle_ratio = (F32)triangle_count / (F32)instanced_triangle_count;
+
+    U32 base_triangle_count = triangle_count;
+
+    U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
+
+    U32 lod_mode = 0;
+
+    F32 lod_error_threshold = 0;
+
+    // The LoD should be in range from Lowest to High
+    if (which_lod > -1 && which_lod < NUM_LOD)
+    {
+        LLCtrlSelectionInterface* iface = mFMP->childGetSelectionInterface("lod_mode_" + lod_name[which_lod]);
+        if (iface)
+        {
+            lod_mode = iface->getFirstSelectedIndex();
+        }
+
+        lod_error_threshold = mFMP->childGetValue("lod_error_threshold_" + lod_name[which_lod]).asReal();
+    }
+
+    if (which_lod != -1)
+    {
+        mRequestedLoDMode[which_lod] = lod_mode;
+    }
+
+    if (lod_mode == 0)
+    {
+        lod_mode = GLOD_TRIANGLE_BUDGET;
+
+        // The LoD should be in range from Lowest to High
+        if (which_lod > -1 && which_lod < NUM_LOD)
+        {
+            limit = mFMP->childGetValue("lod_triangle_limit_" + lod_name[which_lod]).asInteger();
+            //convert from "scene wide" to "non-instanced" triangle limit
+            limit = (S32)((F32)limit*triangle_ratio);
+        }
+    }
+    else
+    {
+        lod_mode = GLOD_ERROR_THRESHOLD;
+    }
+
+    bool object_dirty = false;
+
+    if (mGroup == 0)
+    {
+        object_dirty = true;
+        mGroup = cur_name++;
+        glodNewGroup(mGroup);
+    }
+
+    if (object_dirty)
+    {
+        for (LLModelLoader::model_list::iterator iter = mBaseModel.begin(); iter != mBaseModel.end(); ++iter)
+        { //build GLOD objects for each model in base model list
+            LLModel* mdl = *iter;
+
+            if (mObject[mdl] != 0)
+            {
+                glodDeleteObject(mObject[mdl]);
+            }
+
+            mObject[mdl] = cur_name++;
+
+            glodNewObject(mObject[mdl], mGroup, GLOD_DISCRETE);
+            stop_gloderror();
+
+            if (iter == mBaseModel.begin() && !mdl->mSkinWeights.empty())
+            { //regenerate vertex buffer for skinned models to prevent animation feedback during LOD generation
+                mVertexBuffer[5].clear();
+            }
+
+            if (mVertexBuffer[5].empty())
+            {
+                genBuffers(5, false);
+            }
+
+            U32 tri_count = 0;
+            for (U32 i = 0; i < mVertexBuffer[5][mdl].size(); ++i)
+            {
+                LLVertexBuffer* buff = mVertexBuffer[5][mdl][i];
+                buff->setBuffer(type_mask & buff->getTypeMask());
+
+                U32 num_indices = mVertexBuffer[5][mdl][i]->getNumIndices();
+                if (num_indices > 2)
+                {
+                    glodInsertElements(mObject[mdl], i, GL_TRIANGLES, num_indices, GL_UNSIGNED_SHORT, (U8*)mVertexBuffer[5][mdl][i]->getIndicesPointer(), 0, 0.f);
+                }
+                tri_count += num_indices / 3;
+                stop_gloderror();
+            }
+
+            glodBuildObject(mObject[mdl]);
+            stop_gloderror();
+        }
+    }
+
+
+    S32 start = LLModel::LOD_HIGH;
+    S32 end = 0;
+
+    if (which_lod != -1)
+    {
+        start = end = which_lod;
+    }
+
+    mMaxTriangleLimit = base_triangle_count;
+
+    for (S32 lod = start; lod >= end; --lod)
+    {
+        if (which_lod == -1)
+        {
+            if (lod < start)
+            {
+                triangle_count /= decimation;
+            }
+        }
+        else
+        {
+            if (enforce_tri_limit)
+            {
+                triangle_count = limit;
+            }
+            else
+            {
+                for (S32 j = LLModel::LOD_HIGH; j>which_lod; --j)
+                {
+                    triangle_count /= decimation;
+                }
+            }
+        }
+
+        mModel[lod].clear();
+        mModel[lod].resize(mBaseModel.size());
+        mVertexBuffer[lod].clear();
+
+        U32 actual_tris = 0;
+        U32 actual_verts = 0;
+        U32 submeshes = 0;
+
+        mRequestedTriangleCount[lod] = (S32)((F32)triangle_count / triangle_ratio);
+        mRequestedErrorThreshold[lod] = lod_error_threshold;
+
+        glodGroupParameteri(mGroup, GLOD_ADAPT_MODE, lod_mode);
+        stop_gloderror();
+
+        glodGroupParameteri(mGroup, GLOD_ERROR_MODE, GLOD_OBJECT_SPACE_ERROR);
+        stop_gloderror();
+
+        glodGroupParameterf(mGroup, GLOD_OBJECT_SPACE_ERROR_THRESHOLD, lod_error_threshold);
+        stop_gloderror();
+
+        if (lod_mode != GLOD_TRIANGLE_BUDGET)
+        {
+            glodGroupParameteri(mGroup, GLOD_MAX_TRIANGLES, 0);
+        }
+        else
+        {
+            //SH-632: always add 1 to desired amount to avoid decimating below desired amount
+            glodGroupParameteri(mGroup, GLOD_MAX_TRIANGLES, triangle_count + 1);
+        }
+
+        stop_gloderror();
+        glodAdaptGroup(mGroup);
+        stop_gloderror();
+
+        for (U32 mdl_idx = 0; mdl_idx < mBaseModel.size(); ++mdl_idx)
+        {
+            LLModel* base = mBaseModel[mdl_idx];
+
+            GLint patch_count = 0;
+            glodGetObjectParameteriv(mObject[base], GLOD_NUM_PATCHES, &patch_count);
+            stop_gloderror();
+
+            LLVolumeParams volume_params;
+            volume_params.setType(LL_PCODE_PROFILE_SQUARE, LL_PCODE_PATH_LINE);
+            mModel[lod][mdl_idx] = new LLModel(volume_params, 0.f);
+
+            std::string name = base->mLabel;
+
+            switch (lod)
+            {
+            case LLModel::LOD_IMPOSTOR: name += "_LOD0"; break;
+            case LLModel::LOD_LOW:      name += "_LOD1"; break;
+            case LLModel::LOD_MEDIUM:   name += "_LOD2"; break;
+            case LLModel::LOD_PHYSICS:  name += "_PHYS"; break;
+            case LLModel::LOD_HIGH:                      break;
+            }
+
+            mModel[lod][mdl_idx]->mLabel = name;
+            mModel[lod][mdl_idx]->mSubmodelID = base->mSubmodelID;
+
+            GLint* sizes = new GLint[patch_count * 2];
+            glodGetObjectParameteriv(mObject[base], GLOD_PATCH_SIZES, sizes);
+            stop_gloderror();
+
+            GLint* names = new GLint[patch_count];
+            glodGetObjectParameteriv(mObject[base], GLOD_PATCH_NAMES, names);
+            stop_gloderror();
+
+            mModel[lod][mdl_idx]->setNumVolumeFaces(patch_count);
+
+            LLModel* target_model = mModel[lod][mdl_idx];
+
+            for (GLint i = 0; i < patch_count; ++i)
+            {
+                type_mask = mVertexBuffer[5][base][i]->getTypeMask();
+
+                LLPointer<LLVertexBuffer> buff = new LLVertexBuffer(type_mask, 0);
+
+                if (sizes[i * 2 + 1] > 0 && sizes[i * 2] > 0)
+                {
+                    if (!buff->allocateBuffer(sizes[i * 2 + 1], sizes[i * 2], true))
+                    {
+                        // Todo: find a way to stop preview in this case instead of crashing
+                        LL_ERRS() << "Failed buffer allocation during preview LOD generation."
+                            << " Vertices: " << sizes[i * 2 + 1]
+                            << " Indices: " << sizes[i * 2] << LL_ENDL;
+                    }
+                    buff->setBuffer(type_mask);
+                    glodFillElements(mObject[base], names[i], GL_UNSIGNED_SHORT, (U8*)buff->getIndicesPointer());
+                    stop_gloderror();
+                }
+                else
+                {
+                    // This face was eliminated or we failed to allocate buffer,
+                    // attempt to create a dummy triangle (one vertex, 3 indices, all 0)
+                    buff->allocateBuffer(1, 3, true);
+                    memset((U8*)buff->getMappedData(), 0, buff->getSize());
+                    memset((U8*)buff->getIndicesPointer(), 0, buff->getIndicesSize());
+                }
+
+                buff->validateRange(0, buff->getNumVerts() - 1, buff->getNumIndices(), 0);
+
+                LLStrider<LLVector3> pos;
+                LLStrider<LLVector3> norm;
+                LLStrider<LLVector2> tc;
+                LLStrider<U16> index;
+
+                buff->getVertexStrider(pos);
+                if (type_mask & LLVertexBuffer::MAP_NORMAL)
+                {
+                    buff->getNormalStrider(norm);
+                }
+                if (type_mask & LLVertexBuffer::MAP_TEXCOORD0)
+                {
+                    buff->getTexCoord0Strider(tc);
+                }
+
+                buff->getIndexStrider(index);
+
+                target_model->setVolumeFaceData(names[i], pos, norm, tc, index, buff->getNumVerts(), buff->getNumIndices());
+                actual_tris += buff->getNumIndices() / 3;
+                actual_verts += buff->getNumVerts();
+                ++submeshes;
+
+                if (!validate_face(target_model->getVolumeFace(names[i])))
+                {
+                    LL_ERRS() << "Invalid face generated during LOD generation." << LL_ENDL;
+                }
+            }
+
+            //blind copy skin weights and just take closest skin weight to point on
+            //decimated mesh for now (auto-generating LODs with skin weights is still a bit
+            //of an open problem).
+            target_model->mPosition = base->mPosition;
+            target_model->mSkinWeights = base->mSkinWeights;
+            target_model->mSkinInfo = base->mSkinInfo;
+            //copy material list
+            target_model->mMaterialList = base->mMaterialList;
+
+            if (!validate_model(target_model))
+            {
+                LL_ERRS() << "Invalid model generated when creating LODs" << LL_ENDL;
+            }
+
+            delete[] sizes;
+            delete[] names;
+        }
+
+        //rebuild scene based on mBaseScene
+        mScene[lod].clear();
+        mScene[lod] = mBaseScene;
+
+        for (U32 i = 0; i < mBaseModel.size(); ++i)
+        {
+            LLModel* mdl = mBaseModel[i];
+            LLModel* target = mModel[lod][i];
+            if (target)
+            {
+                for (LLModelLoader::scene::iterator iter = mScene[lod].begin(); iter != mScene[lod].end(); ++iter)
+                {
+                    for (U32 j = 0; j < iter->second.size(); ++j)
+                    {
+                        if (iter->second[j].mModel == mdl)
+                        {
+                            iter->second[j].mModel = target;
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    mResourceCost = calcResourceCost();
+
+    LLVertexBuffer::unbind();
+    LLGLSLShader::sNoFixedFunction = no_ff;
+    if (shader)
+    {
+        shader->bind();
+    }
+}
+
+void LLModelPreview::updateStatusMessages()
+{
+    // bit mask values for physics errors. used to prevent overwrite of single line status
+    // TODO: use this to provied multiline status
+    enum PhysicsError
+    {
+        NONE = 0,
+        NOHAVOK = 1,
+        DEGENERATE = 2,
+        TOOMANYHULLS = 4,
+        TOOMANYVERTSINHULL = 8
+    };
+
+    assert_main_thread();
+
+    U32 has_physics_error{ PhysicsError::NONE }; // physics error bitmap
+    //triangle/vertex/submesh count for each mesh asset for each lod
+    std::vector<S32> tris[LLModel::NUM_LODS];
+    std::vector<S32> verts[LLModel::NUM_LODS];
+    std::vector<S32> submeshes[LLModel::NUM_LODS];
+
+    //total triangle/vertex/submesh count for each lod
+    S32 total_tris[LLModel::NUM_LODS];
+    S32 total_verts[LLModel::NUM_LODS];
+    S32 total_submeshes[LLModel::NUM_LODS];
+
+    for (U32 i = 0; i < LLModel::NUM_LODS - 1; i++)
+    {
+        total_tris[i] = 0;
+        total_verts[i] = 0;
+        total_submeshes[i] = 0;
+    }
+
+    for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
+    {
+        LLModelInstance& instance = *iter;
+
+        LLModel* model_high_lod = instance.mLOD[LLModel::LOD_HIGH];
+        if (!model_high_lod)
+        {
+            setLoadState(LLModelLoader::ERROR_MATERIALS);
+            mFMP->childDisable("calculate_btn");
+            continue;
+        }
+
+        for (U32 i = 0; i < LLModel::NUM_LODS - 1; i++)
+        {
+            LLModel* lod_model = instance.mLOD[i];
+            if (!lod_model)
+            {
+                setLoadState(LLModelLoader::ERROR_MATERIALS);
+                mFMP->childDisable("calculate_btn");
+            }
+            else
+            {
+                //for each model in the lod
+                S32 cur_tris = 0;
+                S32 cur_verts = 0;
+                S32 cur_submeshes = lod_model->getNumVolumeFaces();
+
+                for (S32 j = 0; j < cur_submeshes; ++j)
+                { //for each submesh (face), add triangles and vertices to current total
+                    const LLVolumeFace& face = lod_model->getVolumeFace(j);
+                    cur_tris += face.mNumIndices / 3;
+                    cur_verts += face.mNumVertices;
+                }
+
+                std::string instance_name = instance.mLabel;
+
+                if (mImporterDebug)
+                {
+                    // Useful for debugging generalized complaints below about total submeshes which don't have enough
+                    // context to address exactly what needs to be fixed to move towards compliance with the rules.
+                    //
+                    std::ostringstream out;
+                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Verts: " << cur_verts;
+                    LL_INFOS() << out.str() << LL_ENDL;
+                    LLFloaterModelPreview::addStringToLog(out, false);
+
+                    out.str("");
+                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Tris:  " << cur_tris;
+                    LL_INFOS() << out.str() << LL_ENDL;
+                    LLFloaterModelPreview::addStringToLog(out, false);
+
+                    out.str("");
+                    out << "Instance " << lod_model->mLabel << " LOD " << i << " Faces: " << cur_submeshes;
+                    LL_INFOS() << out.str() << LL_ENDL;
+                    LLFloaterModelPreview::addStringToLog(out, false);
+
+                    out.str("");
+                    LLModel::material_list::iterator mat_iter = lod_model->mMaterialList.begin();
+                    while (mat_iter != lod_model->mMaterialList.end())
+                    {
+                        out << "Instance " << lod_model->mLabel << " LOD " << i << " Material " << *(mat_iter);
+                        LL_INFOS() << out.str() << LL_ENDL;
+                        LLFloaterModelPreview::addStringToLog(out, false);
+                        out.str("");
+                        mat_iter++;
+                    }
+                }
+
+                //add this model to the lod total
+                total_tris[i] += cur_tris;
+                total_verts[i] += cur_verts;
+                total_submeshes[i] += cur_submeshes;
+
+                //store this model's counts to asset data
+                tris[i].push_back(cur_tris);
+                verts[i].push_back(cur_verts);
+                submeshes[i].push_back(cur_submeshes);
+            }
+        }
+    }
+
+    if (mMaxTriangleLimit == 0)
+    {
+        mMaxTriangleLimit = total_tris[LLModel::LOD_HIGH];
+    }
+
+    mHasDegenerate = false;
+    {//check for degenerate triangles in physics mesh
+        U32 lod = LLModel::LOD_PHYSICS;
+        const LLVector4a scale(0.5f);
+        for (U32 i = 0; i < mModel[lod].size() && !mHasDegenerate; ++i)
+        { //for each model in the lod
+            if (mModel[lod][i] && mModel[lod][i]->mPhysics.mHull.empty())
+            { //no decomp exists
+                S32 cur_submeshes = mModel[lod][i]->getNumVolumeFaces();
+                for (S32 j = 0; j < cur_submeshes && !mHasDegenerate; ++j)
+                { //for each submesh (face), add triangles and vertices to current total
+                    LLVolumeFace& face = mModel[lod][i]->getVolumeFace(j);
+                    for (S32 k = 0; (k < face.mNumIndices) && !mHasDegenerate;)
+                    {
+                        U16 index_a = face.mIndices[k + 0];
+                        U16 index_b = face.mIndices[k + 1];
+                        U16 index_c = face.mIndices[k + 2];
+
+                        if (index_c == 0 && index_b == 0 && index_a == 0) // test in reverse as 3rd index is less likely to be 0 in a normal case
+                        {
+                            LL_DEBUGS("MeshValidation") << "Empty placeholder triangle (3 identical index 0 verts) ignored" << LL_ENDL;
+                        }
+                        else
+                        {
+                            LLVector4a v1; v1.setMul(face.mPositions[index_a], scale);
+                            LLVector4a v2; v2.setMul(face.mPositions[index_b], scale);
+                            LLVector4a v3; v3.setMul(face.mPositions[index_c], scale);
+                            if (ll_is_degenerate(v1, v2, v3))
+                            {
+                                mHasDegenerate = true;
+                            }
+                        }
+                        k += 3;
+                    }
+                }
+            }
+        }
+    }
+
+    // flag degenerates here rather than deferring to a MAV error later
+    mFMP->childSetVisible("physics_status_message_text", mHasDegenerate); //display or clear
+    auto degenerateIcon = mFMP->getChild<LLIconCtrl>("physics_status_message_icon");
+    degenerateIcon->setVisible(mHasDegenerate);
+    if (mHasDegenerate)
+    {
+        has_physics_error |= PhysicsError::DEGENERATE;
+        mFMP->childSetValue("physics_status_message_text", mFMP->getString("phys_status_degenerate_triangles"));
+        LLUIImagePtr img = LLUI::getUIImage("ModelImport_Status_Error");
+        degenerateIcon->setImage(img);
+    }
+
+    mFMP->childSetTextArg("submeshes_info", "[SUBMESHES]", llformat("%d", total_submeshes[LLModel::LOD_HIGH]));
+
+    std::string mesh_status_na = mFMP->getString("mesh_status_na");
+
+    S32 upload_status[LLModel::LOD_HIGH + 1];
+
+    mModelNoErrors = true;
+
+    const U32 lod_high = LLModel::LOD_HIGH;
+    U32 high_submodel_count = mModel[lod_high].size() - countRootModels(mModel[lod_high]);
+
+    for (S32 lod = 0; lod <= lod_high; ++lod)
+    {
+        upload_status[lod] = 0;
+
+        std::string message = "mesh_status_good";
+
+        if (total_tris[lod] > 0)
+        {
+            mFMP->childSetValue(lod_triangles_name[lod], llformat("%d", total_tris[lod]));
+            mFMP->childSetValue(lod_vertices_name[lod], llformat("%d", total_verts[lod]));
+        }
+        else
+        {
+            if (lod == lod_high)
+            {
+                upload_status[lod] = 2;
+                message = "mesh_status_missing_lod";
+            }
+            else
+            {
+                for (S32 i = lod - 1; i >= 0; --i)
+                {
+                    if (total_tris[i] > 0)
+                    {
+                        upload_status[lod] = 2;
+                        message = "mesh_status_missing_lod";
+                    }
+                }
+            }
+
+            mFMP->childSetValue(lod_triangles_name[lod], mesh_status_na);
+            mFMP->childSetValue(lod_vertices_name[lod], mesh_status_na);
+        }
+
+        if (lod != lod_high)
+        {
+            if (total_submeshes[lod] && total_submeshes[lod] != total_submeshes[lod_high])
+            { //number of submeshes is different
+                message = "mesh_status_submesh_mismatch";
+                upload_status[lod] = 2;
+            }
+            else if (mModel[lod].size() - countRootModels(mModel[lod]) != high_submodel_count)
+            {//number of submodels is different, not all faces are matched correctly.
+                message = "mesh_status_submesh_mismatch";
+                upload_status[lod] = 2;
+                // Note: Submodels in instance were loaded from higher LOD and as result face count
+                // returns same value and total_submeshes[lod] is identical to high_lod one.
+            }
+            else if (!tris[lod].empty() && tris[lod].size() != tris[lod_high].size())
+            { //number of meshes is different
+                message = "mesh_status_mesh_mismatch";
+                upload_status[lod] = 2;
+            }
+            else if (!verts[lod].empty())
+            {
+                S32 sum_verts_higher_lod = 0;
+                S32 sum_verts_this_lod = 0;
+                for (U32 i = 0; i < verts[lod].size(); ++i)
+                {
+                    sum_verts_higher_lod += ((i < verts[lod + 1].size()) ? verts[lod + 1][i] : 0);
+                    sum_verts_this_lod += verts[lod][i];
+                }
+
+                if ((sum_verts_higher_lod > 0) &&
+                    (sum_verts_this_lod > sum_verts_higher_lod))
+                {
+                    //too many vertices in this lod
+                    message = "mesh_status_too_many_vertices";
+                    upload_status[lod] = 1;
+                }
+            }
+        }
+
+        LLIconCtrl* icon = mFMP->getChild<LLIconCtrl>(lod_icon_name[lod]);
+        LLUIImagePtr img = LLUI::getUIImage(lod_status_image[upload_status[lod]]);
+        icon->setVisible(true);
+        icon->setImage(img);
+
+        if (upload_status[lod] >= 2)
+        {
+            mModelNoErrors = false;
+        }
+
+        if (lod == mPreviewLOD)
+        {
+            mFMP->childSetValue("lod_status_message_text", mFMP->getString(message));
+            icon = mFMP->getChild<LLIconCtrl>("lod_status_message_icon");
+            icon->setImage(img);
+        }
+
+        updateLodControls(lod);
+    }
+
+
+    //warn if hulls have more than 256 points in them
+    BOOL physExceededVertexLimit = FALSE;
+    for (U32 i = 0; mModelNoErrors && i < mModel[LLModel::LOD_PHYSICS].size(); ++i)
+    {
+        LLModel* mdl = mModel[LLModel::LOD_PHYSICS][i];
+
+        if (mdl)
+        {
+            for (U32 j = 0; j < mdl->mPhysics.mHull.size(); ++j)
+            {
+                if (mdl->mPhysics.mHull[j].size() > 256)
+                {
+                    physExceededVertexLimit = TRUE;
+                    LL_INFOS() << "Physical model " << mdl->mLabel << " exceeds vertex per hull limitations." << LL_ENDL;
+                    break;
+                }
+            }
+        }
+    }
+
+    if (physExceededVertexLimit)
+    {
+        has_physics_error |= PhysicsError::TOOMANYVERTSINHULL;
+    }
+
+    if (!(has_physics_error & PhysicsError::DEGENERATE)){ // only update this field (incluides clearing it) if it is not already in use.
+        mFMP->childSetVisible("physics_status_message_text", physExceededVertexLimit);
+        LLIconCtrl* physStatusIcon = mFMP->getChild<LLIconCtrl>("physics_status_message_icon");
+        physStatusIcon->setVisible(physExceededVertexLimit);
+        if (physExceededVertexLimit)
+        {
+            mFMP->childSetValue("physics_status_message_text", mFMP->getString("phys_status_vertex_limit_exceeded"));
+            LLUIImagePtr img = LLUI::getUIImage("ModelImport_Status_Warning");
+            physStatusIcon->setImage(img);
+        }
+    }
+
+    if (getLoadState() >= LLModelLoader::ERROR_PARSING)
+    {
+        mModelNoErrors = false;
+        LL_INFOS() << "Loader returned errors, model can't be uploaded" << LL_ENDL;
+    }
+
+    bool uploadingSkin = mFMP->childGetValue("upload_skin").asBoolean();
+    bool uploadingJointPositions = mFMP->childGetValue("upload_joints").asBoolean();
+
+    if (uploadingSkin)
+    {
+        if (uploadingJointPositions && !isRigValidForJointPositionUpload())
+        {
+            mModelNoErrors = false;
+            LL_INFOS() << "Invalid rig, there might be issues with uploading Joint positions" << LL_ENDL;
+        }
+    }
+
+    if (mModelNoErrors && mModelLoader)
+    {
+        if (!mModelLoader->areTexturesReady() && mFMP->childGetValue("upload_textures").asBoolean())
+        {
+            // Some textures are still loading, prevent upload until they are done
+            mModelNoErrors = false;
+        }
+    }
+
+    if (!mModelNoErrors || mHasDegenerate)
+    {
+        mFMP->childDisable("ok_btn");
+        mFMP->childDisable("calculate_btn");
+    }
+    else
+    {
+        mFMP->childEnable("ok_btn");
+        mFMP->childEnable("calculate_btn");
+    }
+
+    if (mModelNoErrors && mLodsWithParsingError.empty())
+    {
+        mFMP->childEnable("calculate_btn");
+    }
+    else
+    {
+        mFMP->childDisable("calculate_btn");
+    }
+
+    //add up physics triangles etc
+    S32 phys_tris = 0;
+    S32 phys_hulls = 0;
+    S32 phys_points = 0;
+
+    //get the triangle count for the whole scene
+    for (LLModelLoader::scene::iterator iter = mScene[LLModel::LOD_PHYSICS].begin(), endIter = mScene[LLModel::LOD_PHYSICS].end(); iter != endIter; ++iter)
+    {
+        for (LLModelLoader::model_instance_list::iterator instance = iter->second.begin(), end_instance = iter->second.end(); instance != end_instance; ++instance)
+        {
+            LLModel* model = instance->mModel;
+            if (model)
+            {
+                S32 cur_submeshes = model->getNumVolumeFaces();
+
+                LLModel::convex_hull_decomposition& decomp = model->mPhysics.mHull;
+
+                if (!decomp.empty())
+                {
+                    phys_hulls += decomp.size();
+                    for (U32 i = 0; i < decomp.size(); ++i)
+                    {
+                        phys_points += decomp[i].size();
+                    }
+                }
+                else
+                { //choose physics shape OR decomposition, can't use both
+                    for (S32 j = 0; j < cur_submeshes; ++j)
+                    { //for each submesh (face), add triangles and vertices to current total
+                        const LLVolumeFace& face = model->getVolumeFace(j);
+                        phys_tris += face.mNumIndices / 3;
+                    }
+                }
+            }
+        }
+    }
+
+    if (phys_tris > 0)
+    {
+        mFMP->childSetTextArg("physics_triangles", "[TRIANGLES]", llformat("%d", phys_tris));
+    }
+    else
+    {
+        mFMP->childSetTextArg("physics_triangles", "[TRIANGLES]", mesh_status_na);
+    }
+
+    if (phys_hulls > 0)
+    {
+        mFMP->childSetTextArg("physics_hulls", "[HULLS]", llformat("%d", phys_hulls));
+        mFMP->childSetTextArg("physics_points", "[POINTS]", llformat("%d", phys_points));
+    }
+    else
+    {
+        mFMP->childSetTextArg("physics_hulls", "[HULLS]", mesh_status_na);
+        mFMP->childSetTextArg("physics_points", "[POINTS]", mesh_status_na);
+    }
+
+    LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
+    if (fmp)
+    {
+        if (phys_tris > 0 || phys_hulls > 0)
+        {
+            if (!fmp->isViewOptionEnabled("show_physics"))
+            {
+                fmp->enableViewOption("show_physics");
+                mViewOption["show_physics"] = true;
+                fmp->childSetValue("show_physics", true);
+            }
+        }
+        else
+        {
+            fmp->disableViewOption("show_physics");
+            mViewOption["show_physics"] = false;
+            fmp->childSetValue("show_physics", false);
+
+        }
+
+        //bool use_hull = fmp->childGetValue("physics_use_hull").asBoolean();
+
+        //fmp->childSetEnabled("physics_optimize", !use_hull);
+
+        bool enable = (phys_tris > 0 || phys_hulls > 0) && fmp->mCurRequest.empty();
+        //enable = enable && !use_hull && fmp->childGetValue("physics_optimize").asBoolean();
+
+        //enable/disable "analysis" UI
+        LLPanel* panel = fmp->getChild<LLPanel>("physics analysis");
+        LLView* child = panel->getFirstChild();
+        while (child)
+        {
+            child->setEnabled(enable);
+            child = panel->findNextSibling(child);
+        }
+
+        enable = phys_hulls > 0 && fmp->mCurRequest.empty();
+        //enable/disable "simplification" UI
+        panel = fmp->getChild<LLPanel>("physics simplification");
+        child = panel->getFirstChild();
+        while (child)
+        {
+            child->setEnabled(enable);
+            child = panel->findNextSibling(child);
+        }
+
+        if (fmp->mCurRequest.empty())
+        {
+            fmp->childSetVisible("Simplify", true);
+            fmp->childSetVisible("simplify_cancel", false);
+            fmp->childSetVisible("Decompose", true);
+            fmp->childSetVisible("decompose_cancel", false);
+
+            if (phys_hulls > 0)
+            {
+                fmp->childEnable("Simplify");
+            }
+
+            if (phys_tris || phys_hulls > 0)
+            {
+                fmp->childEnable("Decompose");
+            }
+        }
+        else
+        {
+            fmp->childEnable("simplify_cancel");
+            fmp->childEnable("decompose_cancel");
+        }
+    }
+
+
+    LLCtrlSelectionInterface* iface = fmp->childGetSelectionInterface("physics_lod_combo");
+    S32 which_mode = 0;
+    S32 file_mode = 1;
+    if (iface)
+    {
+        which_mode = iface->getFirstSelectedIndex();
+        file_mode = iface->getItemCount() - 1;
+    }
+
+    if (which_mode == file_mode)
+    {
+        mFMP->childEnable("physics_file");
+        mFMP->childEnable("physics_browse");
+    }
+    else
+    {
+        mFMP->childDisable("physics_file");
+        mFMP->childDisable("physics_browse");
+    }
+
+    LLSpinCtrl* crease = mFMP->getChild<LLSpinCtrl>("crease_angle");
+
+    if (mRequestedCreaseAngle[mPreviewLOD] == -1.f)
+    {
+        mFMP->childSetColor("crease_label", LLColor4::grey);
+        crease->forceSetValue(75.f);
+    }
+    else
+    {
+        mFMP->childSetColor("crease_label", LLColor4::white);
+        crease->forceSetValue(mRequestedCreaseAngle[mPreviewLOD]);
+    }
+
+    mModelUpdatedSignal(true);
+
+}
+
+void LLModelPreview::updateLodControls(S32 lod)
+{
+    if (lod < LLModel::LOD_IMPOSTOR || lod > LLModel::LOD_HIGH)
+    {
+        std::ostringstream out;
+        out << "Invalid level of detail: " << lod;
+        LL_WARNS() << out.str() << LL_ENDL;
+        LLFloaterModelPreview::addStringToLog(out, false);
+        assert(lod >= LLModel::LOD_IMPOSTOR && lod <= LLModel::LOD_HIGH);
+        return;
+    }
+
+    const char* lod_controls[] =
+    {
+        "lod_mode_",
+        "lod_triangle_limit_",
+        "lod_error_threshold_"
+    };
+    const U32 num_lod_controls = sizeof(lod_controls) / sizeof(char*);
+
+    const char* file_controls[] =
+    {
+        "lod_browse_",
+        "lod_file_",
+    };
+    const U32 num_file_controls = sizeof(file_controls) / sizeof(char*);
+
+    LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
+    if (!fmp) return;
+
+    LLComboBox* lod_combo = mFMP->findChild<LLComboBox>("lod_source_" + lod_name[lod]);
+    if (!lod_combo) return;
+
+    S32 lod_mode = lod_combo->getCurrentIndex();
+    if (lod_mode == LOD_FROM_FILE) // LoD from file
+    {
+        fmp->mLODMode[lod] = 0;
+        for (U32 i = 0; i < num_file_controls; ++i)
+        {
+            mFMP->childSetVisible(file_controls[i] + lod_name[lod], true);
+        }
+
+        for (U32 i = 0; i < num_lod_controls; ++i)
+        {
+            mFMP->childSetVisible(lod_controls[i] + lod_name[lod], false);
+        }
+    }
+    else if (lod_mode == USE_LOD_ABOVE) // use LoD above
+    {
+        fmp->mLODMode[lod] = 2;
+        for (U32 i = 0; i < num_file_controls; ++i)
+        {
+            mFMP->childSetVisible(file_controls[i] + lod_name[lod], false);
+        }
+
+        for (U32 i = 0; i < num_lod_controls; ++i)
+        {
+            mFMP->childSetVisible(lod_controls[i] + lod_name[lod], false);
+        }
+
+        if (lod < LLModel::LOD_HIGH)
+        {
+            mModel[lod] = mModel[lod + 1];
+            mScene[lod] = mScene[lod + 1];
+            mVertexBuffer[lod].clear();
+
+            // Also update lower LoD
+            if (lod > LLModel::LOD_IMPOSTOR)
+            {
+                updateLodControls(lod - 1);
+            }
+        }
+    }
+    else // auto generate, the default case for all LoDs except High
+    {
+        fmp->mLODMode[lod] = 1;
+
+        //don't actually regenerate lod when refreshing UI
+        mLODFrozen = true;
+
+        for (U32 i = 0; i < num_file_controls; ++i)
+        {
+            mFMP->getChildView(file_controls[i] + lod_name[lod])->setVisible(false);
+        }
+
+        for (U32 i = 0; i < num_lod_controls; ++i)
+        {
+            mFMP->getChildView(lod_controls[i] + lod_name[lod])->setVisible(true);
+        }
+
+
+        LLSpinCtrl* threshold = mFMP->getChild<LLSpinCtrl>("lod_error_threshold_" + lod_name[lod]);
+        LLSpinCtrl* limit = mFMP->getChild<LLSpinCtrl>("lod_triangle_limit_" + lod_name[lod]);
+
+        limit->setMaxValue(mMaxTriangleLimit);
+        limit->forceSetValue(mRequestedTriangleCount[lod]);
+
+        threshold->forceSetValue(mRequestedErrorThreshold[lod]);
+
+        mFMP->getChild<LLComboBox>("lod_mode_" + lod_name[lod])->selectNthItem(mRequestedLoDMode[lod]);
+
+        if (mRequestedLoDMode[lod] == 0)
+        {
+            limit->setVisible(true);
+            threshold->setVisible(false);
+
+            limit->setMaxValue(mMaxTriangleLimit);
+            limit->setIncrement(mMaxTriangleLimit / 32);
+        }
+        else
+        {
+            limit->setVisible(false);
+            threshold->setVisible(true);
+        }
+
+        mLODFrozen = false;
+    }
+}
+
+void LLModelPreview::setPreviewTarget(F32 distance)
+{
+    mCameraDistance = distance;
+    mCameraZoom = 1.f;
+    mCameraPitch = 0.f;
+    mCameraYaw = 0.f;
+    mCameraOffset.clearVec();
+}
+
+void LLModelPreview::clearBuffers()
+{
+    for (U32 i = 0; i < 6; i++)
+    {
+        mVertexBuffer[i].clear();
+    }
+}
+
+void LLModelPreview::genBuffers(S32 lod, bool include_skin_weights)
+{
+    U32 tri_count = 0;
+    U32 vertex_count = 0;
+    U32 mesh_count = 0;
+
+
+    LLModelLoader::model_list* model = NULL;
+
+    if (lod < 0 || lod > 4)
+    {
+        model = &mBaseModel;
+        lod = 5;
+    }
+    else
+    {
+        model = &(mModel[lod]);
+    }
+
+    if (!mVertexBuffer[lod].empty())
+    {
+        mVertexBuffer[lod].clear();
+    }
+
+    mVertexBuffer[lod].clear();
+
+    LLModelLoader::model_list::iterator base_iter = mBaseModel.begin();
+
+    for (LLModelLoader::model_list::iterator iter = model->begin(); iter != model->end(); ++iter)
+    {
+        LLModel* mdl = *iter;
+        if (!mdl)
+        {
+            continue;
+        }
+
+        LLModel* base_mdl = *base_iter;
+        base_iter++;
+
+        S32 num_faces = mdl->getNumVolumeFaces();
+        for (S32 i = 0; i < num_faces; ++i)
+        {
+            const LLVolumeFace &vf = mdl->getVolumeFace(i);
+            U32 num_vertices = vf.mNumVertices;
+            U32 num_indices = vf.mNumIndices;
+
+            if (!num_vertices || !num_indices)
+            {
+                continue;
+            }
+
+            LLVertexBuffer* vb = NULL;
+
+            bool skinned = include_skin_weights && !mdl->mSkinWeights.empty();
+
+            U32 mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
+
+            if (skinned)
+            {
+                mask |= LLVertexBuffer::MAP_WEIGHT4;
+            }
+
+            vb = new LLVertexBuffer(mask, 0);
+
+            if (!vb->allocateBuffer(num_vertices, num_indices, TRUE))
+            {
+                // We are likely to crash due this failure, if this happens, find a way to gracefully stop preview
+                std::ostringstream out;
+                out << "Failed to allocate Vertex Buffer for model preview ";
+                out << num_vertices << " vertices and ";
+                out << num_indices << " indices";
+                LL_WARNS() << out.str() << LL_ENDL;
+                LLFloaterModelPreview::addStringToLog(out, true);
+            }
+
+            LLStrider<LLVector3> vertex_strider;
+            LLStrider<LLVector3> normal_strider;
+            LLStrider<LLVector2> tc_strider;
+            LLStrider<U16> index_strider;
+            LLStrider<LLVector4> weights_strider;
+
+            vb->getVertexStrider(vertex_strider);
+            vb->getIndexStrider(index_strider);
+
+            if (skinned)
+            {
+                vb->getWeight4Strider(weights_strider);
+            }
+
+            LLVector4a::memcpyNonAliased16((F32*)vertex_strider.get(), (F32*)vf.mPositions, num_vertices * 4 * sizeof(F32));
+
+            if (vf.mTexCoords)
+            {
+                vb->getTexCoord0Strider(tc_strider);
+                S32 tex_size = (num_vertices * 2 * sizeof(F32) + 0xF) & ~0xF;
+                LLVector4a::memcpyNonAliased16((F32*)tc_strider.get(), (F32*)vf.mTexCoords, tex_size);
+            }
+
+            if (vf.mNormals)
+            {
+                vb->getNormalStrider(normal_strider);
+                LLVector4a::memcpyNonAliased16((F32*)normal_strider.get(), (F32*)vf.mNormals, num_vertices * 4 * sizeof(F32));
+            }
+
+            if (skinned)
+            {
+                for (U32 i = 0; i < num_vertices; i++)
+                {
+                    //find closest weight to vf.mVertices[i].mPosition
+                    LLVector3 pos(vf.mPositions[i].getF32ptr());
+
+                    const LLModel::weight_list& weight_list = base_mdl->getJointInfluences(pos);
+                    llassert(weight_list.size()>0 && weight_list.size() <= 4); // LLModel::loadModel() should guarantee this
+
+                    LLVector4 w(0, 0, 0, 0);
+
+                    for (U32 i = 0; i < weight_list.size(); ++i)
+                    {
+                        F32 wght = llclamp(weight_list[i].mWeight, 0.001f, 0.999f);
+                        F32 joint = (F32)weight_list[i].mJointIdx;
+                        w.mV[i] = joint + wght;
+                        llassert(w.mV[i] - (S32)w.mV[i]>0.0f); // because weights are non-zero, and range of wt values
+                        //should not cause floating point precision issues.
+                    }
+
+                    *(weights_strider++) = w;
+                }
+            }
+
+            // build indices
+            for (U32 i = 0; i < num_indices; i++)
+            {
+                *(index_strider++) = vf.mIndices[i];
+            }
+
+            mVertexBuffer[lod][mdl].push_back(vb);
+
+            vertex_count += num_vertices;
+            tri_count += num_indices / 3;
+            ++mesh_count;
+
+        }
+    }
+}
+
+void LLModelPreview::update()
+{
+    if (mGenLOD)
+    {
+        bool subscribe_for_generation = mLodsQuery.empty();
+        mGenLOD = false;
+        mDirty = true;
+        mLodsQuery.clear();
+
+        for (S32 lod = LLModel::LOD_HIGH; lod >= 0; --lod)
+        {
+            // adding all lods into query for generation
+            mLodsQuery.push_back(lod);
+        }
+
+        if (subscribe_for_generation)
+        {
+            doOnIdleRepeating(lodQueryCallback);
+        }
+    }
+
+    if (mDirty && mLodsQuery.empty())
+    {
+        mDirty = false;
+        mResourceCost = calcResourceCost();
+        refresh();
+        updateStatusMessages();
+    }
+}
+
+//-----------------------------------------------------------------------------
+// createPreviewAvatar
+//-----------------------------------------------------------------------------
+void LLModelPreview::createPreviewAvatar(void)
+{
+    mPreviewAvatar = (LLVOAvatar*)gObjectList.createObjectViewer(LL_PCODE_LEGACY_AVATAR, gAgent.getRegion(), LLViewerObject::CO_FLAG_UI_AVATAR);
+    if (mPreviewAvatar)
+    {
+        mPreviewAvatar->createDrawable(&gPipeline);
+        mPreviewAvatar->mSpecialRenderMode = 1;
+        mPreviewAvatar->startMotion(ANIM_AGENT_STAND);
+        mPreviewAvatar->hideSkirt();
+    }
+    else
+    {
+        LL_INFOS() << "Failed to create preview avatar for upload model window" << LL_ENDL;
+    }
+}
+
+//static
+U32 LLModelPreview::countRootModels(LLModelLoader::model_list models)
+{
+    U32 root_models = 0;
+    model_list::iterator model_iter = models.begin();
+    while (model_iter != models.end())
+    {
+        LLModel* mdl = *model_iter;
+        if (mdl && mdl->mSubmodelID == 0)
+        {
+            root_models++;
+        }
+        model_iter++;
+    }
+    return root_models;
+}
+
+void LLModelPreview::loadedCallback(
+    LLModelLoader::scene& scene,
+    LLModelLoader::model_list& model_list,
+    S32 lod,
+    void* opaque)
+{
+    LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
+    if (pPreview && !LLModelPreview::sIgnoreLoadedCallback)
+    {
+        // Load loader's warnings into floater's log tab
+        const LLSD out = pPreview->mModelLoader->logOut();
+        LLSD::array_const_iterator iter_out = out.beginArray();
+        LLSD::array_const_iterator end_out = out.endArray();
+        for (; iter_out != end_out; ++iter_out)
+        {
+            if (iter_out->has("Message"))
+            {
+                LLFloaterModelPreview::addStringToLog(iter_out->get("Message"), *iter_out, true, pPreview->mModelLoader->mLod);
+            }
+        }
+        pPreview->mModelLoader->clearLog();
+        pPreview->loadModelCallback(lod); // removes mModelLoader in some cases
+    }
+
+}
+
+void LLModelPreview::stateChangedCallback(U32 state, void* opaque)
+{
+    LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
+    if (pPreview)
+    {
+        pPreview->setLoadState(state);
+    }
+}
+
+LLJoint* LLModelPreview::lookupJointByName(const std::string& str, void* opaque)
+{
+    LLModelPreview* pPreview = static_cast< LLModelPreview* >(opaque);
+    if (pPreview)
+    {
+        return pPreview->getPreviewAvatar()->getJoint(str);
+    }
+    return NULL;
+}
+
+U32 LLModelPreview::loadTextures(LLImportMaterial& material, void* opaque)
+{
+    (void)opaque;
+
+    if (material.mDiffuseMapFilename.size())
+    {
+        material.mOpaqueData = new LLPointer< LLViewerFetchedTexture >;
+        LLPointer< LLViewerFetchedTexture >& tex = (*reinterpret_cast< LLPointer< LLViewerFetchedTexture > * >(material.mOpaqueData));
+
+        tex = LLViewerTextureManager::getFetchedTextureFromUrl("file://" + material.mDiffuseMapFilename, FTT_LOCAL_FILE, TRUE, LLGLTexture::BOOST_PREVIEW);
+        tex->setLoadedCallback(LLModelPreview::textureLoadedCallback, 0, TRUE, FALSE, opaque, NULL, FALSE);
+        tex->forceToSaveRawImage(0, F32_MAX);
+        material.setDiffuseMap(tex->getID()); // record tex ID
+        return 1;
+    }
+
+    material.mOpaqueData = NULL;
+    return 0;
+}
+
+void LLModelPreview::addEmptyFace(LLModel* pTarget)
+{
+    U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
+
+    LLPointer<LLVertexBuffer> buff = new LLVertexBuffer(type_mask, 0);
+
+    buff->allocateBuffer(1, 3, true);
+    memset((U8*)buff->getMappedData(), 0, buff->getSize());
+    memset((U8*)buff->getIndicesPointer(), 0, buff->getIndicesSize());
+
+    buff->validateRange(0, buff->getNumVerts() - 1, buff->getNumIndices(), 0);
+
+    LLStrider<LLVector3> pos;
+    LLStrider<LLVector3> norm;
+    LLStrider<LLVector2> tc;
+    LLStrider<U16> index;
+
+    buff->getVertexStrider(pos);
+
+    if (type_mask & LLVertexBuffer::MAP_NORMAL)
+    {
+        buff->getNormalStrider(norm);
+    }
+    if (type_mask & LLVertexBuffer::MAP_TEXCOORD0)
+    {
+        buff->getTexCoord0Strider(tc);
+    }
+
+    buff->getIndexStrider(index);
+
+    //resize face array
+    int faceCnt = pTarget->getNumVolumeFaces();
+    pTarget->setNumVolumeFaces(faceCnt + 1);
+    pTarget->setVolumeFaceData(faceCnt + 1, pos, norm, tc, index, buff->getNumVerts(), buff->getNumIndices());
+
+}
+
+//-----------------------------------------------------------------------------
+// render()
+//-----------------------------------------------------------------------------
+// Todo: we shouldn't be setting all those UI elements on render.
+// Note: Render happens each frame with skinned avatars
+BOOL LLModelPreview::render()
+{
+    assert_main_thread();
+
+    LLMutexLock lock(this);
+    mNeedsUpdate = FALSE;
+
+    bool use_shaders = LLGLSLShader::sNoFixedFunction;
+
+    bool edges = mViewOption["show_edges"];
+    bool joint_overrides = mViewOption["show_joint_overrides"];
+    bool joint_positions = mViewOption["show_joint_positions"];
+    bool skin_weight = mViewOption["show_skin_weight"];
+    bool textures = mViewOption["show_textures"];
+    bool physics = mViewOption["show_physics"];
+
+    // Extra configurability, to be exposed later as controls?
+    static LLCachedControl<LLColor4> canvas_col(gSavedSettings, "MeshPreviewCanvasColor");
+    static LLCachedControl<LLColor4> edge_col(gSavedSettings, "MeshPreviewEdgeColor");
+    static LLCachedControl<LLColor4> base_col(gSavedSettings, "MeshPreviewBaseColor");
+    static LLCachedControl<LLColor3> brightness(gSavedSettings, "MeshPreviewBrightnessColor");
+    static LLCachedControl<F32> edge_width(gSavedSettings, "MeshPreviewEdgeWidth");
+    static LLCachedControl<LLColor4> phys_edge_col(gSavedSettings, "MeshPreviewPhysicsEdgeColor");
+    static LLCachedControl<LLColor4> phys_fill_col(gSavedSettings, "MeshPreviewPhysicsFillColor");
+    static LLCachedControl<F32> phys_edge_width(gSavedSettings, "MeshPreviewPhysicsEdgeWidth");
+    static LLCachedControl<LLColor4> deg_edge_col(gSavedSettings, "MeshPreviewDegenerateEdgeColor");
+    static LLCachedControl<LLColor4> deg_fill_col(gSavedSettings, "MeshPreviewDegenerateFillColor");
+    static LLCachedControl<F32> deg_edge_width(gSavedSettings, "MeshPreviewDegenerateEdgeWidth");
+    static LLCachedControl<F32> deg_point_size(gSavedSettings, "MeshPreviewDegeneratePointSize");
+
+    S32 width = getWidth();
+    S32 height = getHeight();
+
+    LLGLSUIDefault def; // GL_BLEND, GL_ALPHA_TEST, GL_CULL_FACE, depth test
+    LLGLDisable no_blend(GL_BLEND);
+    LLGLDepthTest depth(GL_FALSE); // SL-12781 disable z-buffer to render background color
+    LLGLDisable fog(GL_FOG);
+
+    {
+        if (use_shaders)
+        {
+            gUIProgram.bind();
+        }
+        //clear background to grey
+        gGL.matrixMode(LLRender::MM_PROJECTION);
+        gGL.pushMatrix();
+        gGL.loadIdentity();
+        gGL.ortho(0.0f, width, 0.0f, height, -1.0f, 1.0f);
+
+        gGL.matrixMode(LLRender::MM_MODELVIEW);
+        gGL.pushMatrix();
+        gGL.loadIdentity();
+
+        gGL.color4fv(static_cast<LLColor4>(canvas_col).mV);
+        gl_rect_2d_simple(width, height);
+
+        gGL.matrixMode(LLRender::MM_PROJECTION);
+        gGL.popMatrix();
+
+        gGL.matrixMode(LLRender::MM_MODELVIEW);
+        gGL.popMatrix();
+        if (use_shaders)
+        {
+            gUIProgram.unbind();
+        }
+    }
+
+    LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
+
+    bool has_skin_weights = false;
+    bool upload_skin = mFMP->childGetValue("upload_skin").asBoolean();
+    bool upload_joints = mFMP->childGetValue("upload_joints").asBoolean();
+
+    if (upload_joints != mLastJointUpdate)
+    {
+        mLastJointUpdate = upload_joints;
+    }
+
+    for (LLModelLoader::scene::iterator iter = mScene[mPreviewLOD].begin(); iter != mScene[mPreviewLOD].end(); ++iter)
+    {
+        for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end(); ++model_iter)
+        {
+            LLModelInstance& instance = *model_iter;
+            LLModel* model = instance.mModel;
+            model->mPelvisOffset = mPelvisZOffset;
+            if (!model->mSkinWeights.empty())
+            {
+                has_skin_weights = true;
+            }
+        }
+    }
+
+    if (has_skin_weights && lodsReady())
+    { //model has skin weights, enable view options for skin weights and joint positions
+        U32 flags = getLegacyRigFlags();
+        if (fmp)
+        {
+            if (flags == LEGACY_RIG_OK)
+            {
+                fmp->enableViewOption("show_skin_weight");
+                fmp->setViewOptionEnabled("show_joint_overrides", skin_weight);
+                fmp->setViewOptionEnabled("show_joint_positions", skin_weight);
+                mFMP->childEnable("upload_skin");
+                mFMP->childSetValue("show_skin_weight", skin_weight);
+            }
+            else if ((flags & LEGACY_RIG_FLAG_TOO_MANY_JOINTS) > 0)
+            {
+                mFMP->childSetVisible("skin_too_many_joints", true);
+            }
+            else if ((flags & LEGACY_RIG_FLAG_UNKNOWN_JOINT) > 0)
+            {
+                mFMP->childSetVisible("skin_unknown_joint", true);
+            }
+        }
+    }
+    else
+    {
+        mFMP->childDisable("upload_skin");
+        if (fmp)
+        {
+            mViewOption["show_skin_weight"] = false;
+            fmp->disableViewOption("show_skin_weight");
+            fmp->disableViewOption("show_joint_overrides");
+            fmp->disableViewOption("show_joint_positions");
+
+            skin_weight = false;
+            mFMP->childSetValue("show_skin_weight", false);
+            fmp->setViewOptionEnabled("show_skin_weight", skin_weight);
+        }
+    }
+
+    if (upload_skin && !has_skin_weights)
+    { //can't upload skin weights if model has no skin weights
+        mFMP->childSetValue("upload_skin", false);
+        upload_skin = false;
+    }
+
+    if (!upload_skin && upload_joints)
+    { //can't upload joints if not uploading skin weights
+        mFMP->childSetValue("upload_joints", false);
+        upload_joints = false;
+    }
+
+    if (upload_skin && upload_joints)
+    {
+        mFMP->childEnable("lock_scale_if_joint_position");
+        if (fmp)
+        {
+            fmp->updateAvatarTab();
+        }
+    }
+    else
+    {
+        mFMP->childDisable("lock_scale_if_joint_position");
+        mFMP->childSetValue("lock_scale_if_joint_position", false);
+        if (fmp)
+        {
+            fmp->clearAvatarTab();
+        }
+    }
+
+    //Only enable joint offsets if it passed the earlier critiquing
+    if (isRigValidForJointPositionUpload())
+    {
+        mFMP->childSetEnabled("upload_joints", upload_skin);
+    }
+
+    F32 explode = mFMP->childGetValue("physics_explode").asReal();
+
+    LLGLDepthTest gls_depth(GL_TRUE); // SL-12781 re-enable z-buffer for 3D model preview
+
+    LLRect preview_rect;
+
+    preview_rect = mFMP->getChildView("preview_panel")->getRect();
+
+    F32 aspect = (F32)preview_rect.getWidth() / preview_rect.getHeight();
+
+    LLViewerCamera::getInstance()->setAspect(aspect);
+
+    LLViewerCamera::getInstance()->setView(LLViewerCamera::getInstance()->getDefaultFOV() / mCameraZoom);
+
+    LLVector3 offset = mCameraOffset;
+    LLVector3 target_pos = mPreviewTarget + offset;
+
+    F32 z_near = 0.001f;
+    F32 z_far = mCameraDistance*10.0f + mPreviewScale.magVec() + mCameraOffset.magVec();
+
+    if (skin_weight)
+    {
+        target_pos = getPreviewAvatar()->getPositionAgent() + offset;
+        z_near = 0.01f;
+        z_far = 1024.f;
+
+        //render avatar previews every frame
+        refresh();
+    }
+
+    if (use_shaders)
+    {
+        gObjectPreviewProgram.bind();
+    }
+
+    gGL.loadIdentity();
+    gPipeline.enableLightsPreview();
+
+    LLQuaternion camera_rot = LLQuaternion(mCameraPitch, LLVector3::y_axis) *
+        LLQuaternion(mCameraYaw, LLVector3::z_axis);
+
+    LLQuaternion av_rot = camera_rot;
+    F32 camera_distance = skin_weight ? SKIN_WEIGHT_CAMERA_DISTANCE : mCameraDistance;
+    LLViewerCamera::getInstance()->setOriginAndLookAt(
+        target_pos + ((LLVector3(camera_distance, 0.f, 0.f) + offset) * av_rot),		// camera
+        LLVector3::z_axis,																	// up
+        target_pos);											// point of interest
+
+
+    z_near = llclamp(z_far * 0.001f, 0.001f, 0.1f);
+
+    LLViewerCamera::getInstance()->setPerspective(FALSE, mOrigin.mX, mOrigin.mY, width, height, FALSE, z_near, z_far);
+
+    stop_glerror();
+
+    gGL.pushMatrix();
+    gGL.color4fv(edge_col().mV);
+
+    const U32 type_mask = LLVertexBuffer::MAP_VERTEX | LLVertexBuffer::MAP_NORMAL | LLVertexBuffer::MAP_TEXCOORD0;
+
+    LLGLEnable normalize(GL_NORMALIZE);
+
+    if (!mBaseModel.empty() && mVertexBuffer[5].empty())
+    {
+        genBuffers(-1, skin_weight);
+        //genBuffers(3);
+        //genLODs();
+    }
+
+    if (!mModel[mPreviewLOD].empty())
+    {
+        mFMP->childEnable("reset_btn");
+
+        bool regen = mVertexBuffer[mPreviewLOD].empty();
+        if (!regen)
+        {
+            const std::vector<LLPointer<LLVertexBuffer> >& vb_vec = mVertexBuffer[mPreviewLOD].begin()->second;
+            if (!vb_vec.empty())
+            {
+                const LLVertexBuffer* buff = vb_vec[0];
+                regen = buff->hasDataType(LLVertexBuffer::TYPE_WEIGHT4) != skin_weight;
+            }
+            else
+            {
+                LL_INFOS() << "Vertex Buffer[" << mPreviewLOD << "]" << " is EMPTY!!!" << LL_ENDL;
+                regen = TRUE;
+            }
+        }
+
+        if (regen)
+        {
+            genBuffers(mPreviewLOD, skin_weight);
+        }
+
+        if (!skin_weight)
+        {
+            for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
+            {
+                LLModelInstance& instance = *iter;
+
+                LLModel* model = instance.mLOD[mPreviewLOD];
+
+                if (!model)
+                {
+                    continue;
+                }
+
+                gGL.pushMatrix();
+                LLMatrix4 mat = instance.mTransform;
+
+                gGL.multMatrix((GLfloat*)mat.mMatrix);
+
+
+                U32 num_models = mVertexBuffer[mPreviewLOD][model].size();
+                for (U32 i = 0; i < num_models; ++i)
+                {
+                    LLVertexBuffer* buffer = mVertexBuffer[mPreviewLOD][model][i];
+
+                    buffer->setBuffer(type_mask & buffer->getTypeMask());
+
+                    if (textures)
+                    {
+                        int materialCnt = instance.mModel->mMaterialList.size();
+                        if (i < materialCnt)
+                        {
+                            const std::string& binding = instance.mModel->mMaterialList[i];
+                            const LLImportMaterial& material = instance.mMaterial[binding];
+
+                            gGL.diffuseColor4fv(material.mDiffuseColor.mV);
+
+                            // Find the tex for this material, bind it, and add it to our set
+                            //
+                            LLViewerFetchedTexture* tex = bindMaterialDiffuseTexture(material);
+                            if (tex)
+                            {
+                                mTextureSet.insert(tex);
+                            }
+                        }
+                    }
+                    else
+                    {
+                        gGL.diffuseColor4fv(static_cast<LLColor4>(base_col).mV);
+                    }
+
+                    buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
+                    gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+                    gGL.diffuseColor4fv(static_cast<LLColor4>(edge_col).mV);
+                    if (edges)
+                    {
+                        glLineWidth(edge_width);
+                        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+                        buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
+                        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+                        glLineWidth(1.f);
+                    }
+                }
+                gGL.popMatrix();
+            }
+
+            if (physics)
+            {
+                glClear(GL_DEPTH_BUFFER_BIT);
+
+                for (U32 pass = 0; pass < 2; pass++)
+                {
+                    if (pass == 0)
+                    { //depth only pass
+                        gGL.setColorMask(false, false);
+                    }
+                    else
+                    {
+                        gGL.setColorMask(true, true);
+                    }
+
+                    //enable alpha blending on second pass but not first pass
+                    LLGLState blend(GL_BLEND, pass);
+
+                    gGL.blendFunc(LLRender::BF_SOURCE_ALPHA, LLRender::BF_ONE_MINUS_SOURCE_ALPHA);
+
+                    for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
+                    {
+                        LLModelInstance& instance = *iter;
+
+                        LLModel* model = instance.mLOD[LLModel::LOD_PHYSICS];
+
+                        if (!model)
+                        {
+                            continue;
+                        }
+
+                        gGL.pushMatrix();
+                        LLMatrix4 mat = instance.mTransform;
+
+                        gGL.multMatrix((GLfloat*)mat.mMatrix);
+
+
+                        bool render_mesh = true;
+                        LLPhysicsDecomp* decomp = gMeshRepo.mDecompThread;
+                        if (decomp)
+                        {
+                            LLMutexLock(decomp->mMutex);
+
+                            LLModel::Decomposition& physics = model->mPhysics;
+
+                            if (!physics.mHull.empty())
+                            {
+                                render_mesh = false;
+
+                                if (physics.mMesh.empty())
+                                { //build vertex buffer for physics mesh
+                                    gMeshRepo.buildPhysicsMesh(physics);
+                                }
+
+                                if (!physics.mMesh.empty())
+                                { //render hull instead of mesh
+                                    for (U32 i = 0; i < physics.mMesh.size(); ++i)
+                                    {
+                                        if (explode > 0.f)
+                                        {
+                                            gGL.pushMatrix();
+
+                                            LLVector3 offset = model->mHullCenter[i] - model->mCenterOfHullCenters;
+                                            offset *= explode;
+
+                                            gGL.translatef(offset.mV[0], offset.mV[1], offset.mV[2]);
+                                        }
+
+                                        static std::vector<LLColor4U> hull_colors;
+
+                                        if (i + 1 >= hull_colors.size())
+                                        {
+                                            hull_colors.push_back(LLColor4U(rand() % 128 + 127, rand() % 128 + 127, rand() % 128 + 127, 128));
+                                        }
+
+                                        gGL.diffuseColor4ubv(hull_colors[i].mV);
+                                        LLVertexBuffer::drawArrays(LLRender::TRIANGLES, physics.mMesh[i].mPositions, physics.mMesh[i].mNormals);
+
+                                        if (explode > 0.f)
+                                        {
+                                            gGL.popMatrix();
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        if (render_mesh)
+                        {
+                            if (mVertexBuffer[LLModel::LOD_PHYSICS].empty())
+                            {
+                                genBuffers(LLModel::LOD_PHYSICS, false);
+                            }
+
+                            U32 num_models = mVertexBuffer[LLModel::LOD_PHYSICS][model].size();
+                            if (pass > 0){
+                                for (U32 i = 0; i < num_models; ++i)
+                                {
+                                    LLVertexBuffer* buffer = mVertexBuffer[LLModel::LOD_PHYSICS][model][i];
+
+                                    gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+                                    gGL.diffuseColor4fv(phys_fill_col().mV);
+
+                                    buffer->setBuffer(type_mask & buffer->getTypeMask());
+                                    buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
+
+                                    gGL.diffuseColor4fv(phys_edge_col().mV);
+                                    glLineWidth(phys_edge_width);
+                                    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+                                    buffer->drawRange(LLRender::TRIANGLES, 0, buffer->getNumVerts() - 1, buffer->getNumIndices(), 0);
+
+                                    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+                                    glLineWidth(1.f);
+                                }
+                            }
+                        }
+                        gGL.popMatrix();
+                    }
+
+                    // only do this if mDegenerate was set in the preceding mesh checks [Check this if the ordering ever breaks]
+                    if (pass > 0 && mHasDegenerate)
+                    {
+                        glLineWidth(deg_edge_width);
+                        glPointSize(deg_point_size);
+                        gPipeline.enableLightsFullbright();
+                        //show degenerate triangles
+                        LLGLDepthTest depth(GL_TRUE, GL_TRUE, GL_ALWAYS);
+                        LLGLDisable cull(GL_CULL_FACE);
+                        gGL.diffuseColor4f(1.f, 0.f, 0.f, 1.f);
+                        const LLVector4a scale(0.5f);
+
+                        for (LLMeshUploadThread::instance_list::iterator iter = mUploadData.begin(); iter != mUploadData.end(); ++iter)
+                        {
+                            LLModelInstance& instance = *iter;
+
+                            LLModel* model = instance.mLOD[LLModel::LOD_PHYSICS];
+
+                            if (!model)
+                            {
+                                continue;
+                            }
+
+                            gGL.pushMatrix();
+                            LLMatrix4 mat = instance.mTransform;
+
+                            gGL.multMatrix((GLfloat*)mat.mMatrix);
+
+
+                            LLPhysicsDecomp* decomp = gMeshRepo.mDecompThread;
+                            if (decomp)
+                            {
+                                LLMutexLock(decomp->mMutex);
+
+                                LLModel::Decomposition& physics = model->mPhysics;
+
+                                if (physics.mHull.empty())
+                                {
+                                    if (mVertexBuffer[LLModel::LOD_PHYSICS].empty())
+                                    {
+                                        genBuffers(LLModel::LOD_PHYSICS, false);
+                                    }
+
+                                    U32 num_models = mVertexBuffer[LLModel::LOD_PHYSICS][model].size();
+                                    for (U32 v = 0; v < num_models; ++v)
+                                    {
+                                        LLVertexBuffer* buffer = mVertexBuffer[LLModel::LOD_PHYSICS][model][v];
+                                        if (buffer->getNumVerts() < 3)continue;
+
+                                        buffer->setBuffer(type_mask & buffer->getTypeMask());
+
+                                        LLStrider<LLVector3> pos_strider;
+                                        buffer->getVertexStrider(pos_strider, 0);
+                                        LLVector4a* pos = (LLVector4a*)pos_strider.get();
+
+                                        LLStrider<U16> idx;
+                                        buffer->getIndexStrider(idx, 0);
+
+                                        LLVector4a v1, v2, v3;
+                                        for (U32 indices_offset = 0; indices_offset < buffer->getNumIndices(); indices_offset += 3)
+                                        {
+                                            v1.setMul(pos[*idx++], scale);
+                                            v2.setMul(pos[*idx++], scale);
+                                            v3.setMul(pos[*idx++], scale);
+
+                                            if (ll_is_degenerate(v1, v2, v3))
+                                            {
+                                                glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+                                                gGL.diffuseColor3fv(deg_edge_col().mV);
+                                                buffer->drawRange(LLRender::TRIANGLES, 0, 2, 3, indices_offset);
+                                                buffer->drawRange(LLRender::POINTS, 0, 2, 3, indices_offset);
+                                                glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+                                                gGL.diffuseColor3fv(deg_fill_col().mV);
+                                                buffer->drawRange(LLRender::TRIANGLES, 0, 2, 3, indices_offset);
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+
+                            gGL.popMatrix();
+                        }
+                        glLineWidth(1.f);
+                        glPointSize(1.f);
+                        gPipeline.enableLightsPreview();
+                        gGL.setSceneBlendType(LLRender::BT_ALPHA);
+                    }
+                }
+            }
+        }
+        else
+        {
+            target_pos = getPreviewAvatar()->getPositionAgent();
+            getPreviewAvatar()->clearAttachmentOverrides(); // removes pelvis fixup
+            LLUUID fake_mesh_id;
+            fake_mesh_id.generate();
+            getPreviewAvatar()->addPelvisFixup(mPelvisZOffset, fake_mesh_id);
+            bool pelvis_recalc = false;
+
+            LLViewerCamera::getInstance()->setOriginAndLookAt(
+                target_pos + ((LLVector3(camera_distance, 0.f, 0.f) + offset) * av_rot),		// camera
+                LLVector3::z_axis,																	// up
+                target_pos);											// point of interest
+
+            for (LLModelLoader::scene::iterator iter = mScene[mPreviewLOD].begin(); iter != mScene[mPreviewLOD].end(); ++iter)
+            {
+                for (LLModelLoader::model_instance_list::iterator model_iter = iter->second.begin(); model_iter != iter->second.end(); ++model_iter)
+                {
+                    LLModelInstance& instance = *model_iter;
+                    LLModel* model = instance.mModel;
+
+                    if (!model->mSkinWeights.empty())
+                    {
+                        const LLMeshSkinInfo *skin = &model->mSkinInfo;
+                        LLSkinningUtil::initJointNums(&model->mSkinInfo, getPreviewAvatar());// inits skin->mJointNums if nessesary
+                        U32 count = LLSkinningUtil::getMeshJointCount(skin);
+
+                        if (joint_overrides && skin->mAlternateBindMatrix.size() > 0)
+                        {
+                            // mesh_id is used to determine which mesh gets to
+                            // set the joint offset, in the event of a conflict. Since
+                            // we don't know the mesh id yet, we can't guarantee that
+                            // joint offsets will be applied with the same priority as
+                            // in the uploaded model. If the file contains multiple
+                            // meshes with conflicting joint offsets, preview may be
+                            // incorrect.
+                            LLUUID fake_mesh_id;
+                            fake_mesh_id.generate();
+                            for (U32 j = 0; j < count; ++j)
+                            {
+                                LLJoint *joint = getPreviewAvatar()->getJoint(skin->mJointNums[j]);
+                                if (joint)
+                                {
+                                    const LLVector3& jointPos = skin->mAlternateBindMatrix[j].getTranslation();
+                                    if (joint->aboveJointPosThreshold(jointPos))
+                                    {
+                                        bool override_changed;
+                                        joint->addAttachmentPosOverride(jointPos, fake_mesh_id, "model", override_changed);
+
+                                        if (override_changed)
+                                        {
+                                            //If joint is a pelvis then handle old/new pelvis to foot values
+                                            if (joint->getName() == "mPelvis")// or skin->mJointNames[j]
+                                            {
+                                                pelvis_recalc = true;
+                                            }
+                                        }
+                                        if (skin->mLockScaleIfJointPosition)
+                                        {
+                                            // Note that unlike positions, there's no threshold check here,
+                                            // just a lock at the default value.
+                                            joint->addAttachmentScaleOverride(joint->getDefaultScale(), fake_mesh_id, "model");
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        for (U32 i = 0, e = mVertexBuffer[mPreviewLOD][model].size(); i < e; ++i)
+                        {
+                            LLVertexBuffer* buffer = mVertexBuffer[mPreviewLOD][model][i];
+
+                            const LLVolumeFace& face = model->getVolumeFace(i);
+
+                            LLStrider<LLVector3> position;
+                            buffer->getVertexStrider(position);
+
+                            LLStrider<LLVector4> weight;
+                            buffer->getWeight4Strider(weight);
+
+                            //quick 'n dirty software vertex skinning
+
+                            //build matrix palette
+
+                            LLMatrix4a mat[LL_MAX_JOINTS_PER_MESH_OBJECT];
+                            LLSkinningUtil::initSkinningMatrixPalette((LLMatrix4*)mat, count,
+                                skin, getPreviewAvatar());
+
+                            LLMatrix4a bind_shape_matrix;
+                            bind_shape_matrix.loadu(skin->mBindShapeMatrix);
+                            U32 max_joints = LLSkinningUtil::getMaxJointCount();
+                            for (U32 j = 0; j < buffer->getNumVerts(); ++j)
+                            {
+                                LLMatrix4a final_mat;
+                                F32 *wptr = weight[j].mV;
+                                LLSkinningUtil::getPerVertexSkinMatrix(wptr, mat, true, final_mat, max_joints);
+
+                                //VECTORIZE THIS
+                                LLVector4a& v = face.mPositions[j];
+
+                                LLVector4a t;
+                                LLVector4a dst;
+                                bind_shape_matrix.affineTransform(v, t);
+                                final_mat.affineTransform(t, dst);
+
+                                position[j][0] = dst[0];
+                                position[j][1] = dst[1];
+                                position[j][2] = dst[2];
+                            }
+
+                            llassert(model->mMaterialList.size() > i);
+                            const std::string& binding = instance.mModel->mMaterialList[i];
+                            const LLImportMaterial& material = instance.mMaterial[binding];
+
+                            buffer->setBuffer(type_mask & buffer->getTypeMask());
+                            gGL.diffuseColor4fv(material.mDiffuseColor.mV);
+                            gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+
+                            // Find the tex for this material, bind it, and add it to our set
+                            //
+                            LLViewerFetchedTexture* tex = bindMaterialDiffuseTexture(material);
+                            if (tex)
+                            {
+                                mTextureSet.insert(tex);
+                            }
+
+                            buffer->draw(LLRender::TRIANGLES, buffer->getNumIndices(), 0);
+
+                            if (edges)
+                            {
+                                gGL.diffuseColor4fv(edge_col().mV);
+                                glLineWidth(edge_width);
+                                glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+                                buffer->draw(LLRender::TRIANGLES, buffer->getNumIndices(), 0);
+                                glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+                                glLineWidth(1.f);
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (joint_positions)
+            {
+                LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
+                if (shader)
+                {
+                    gDebugProgram.bind();
+                }
+                getPreviewAvatar()->renderCollisionVolumes();
+                if (fmp->mTabContainer->getCurrentPanelIndex() == fmp->mAvatarTabIndex)
+                {
+                    getPreviewAvatar()->renderBones(fmp->mSelectedJointName);
+                }
+                else
+                {
+                    getPreviewAvatar()->renderBones();
+                }
+                if (shader)
+                {
+                    shader->bind();
+                }
+            }
+
+            if (pelvis_recalc)
+            {
+                // size/scale recalculation
+                getPreviewAvatar()->postPelvisSetRecalc();
+            }
+        }
+    }
+
+    if (use_shaders)
+    {
+        gObjectPreviewProgram.unbind();
+    }
+
+    gGL.popMatrix();
+
+    return TRUE;
+}
+
+//-----------------------------------------------------------------------------
+// refresh()
+//-----------------------------------------------------------------------------
+void LLModelPreview::refresh()
+{
+    mNeedsUpdate = TRUE;
+}
+
+//-----------------------------------------------------------------------------
+// rotate()
+//-----------------------------------------------------------------------------
+void LLModelPreview::rotate(F32 yaw_radians, F32 pitch_radians)
+{
+    mCameraYaw = mCameraYaw + yaw_radians;
+
+    mCameraPitch = llclamp(mCameraPitch + pitch_radians, F_PI_BY_TWO * -0.8f, F_PI_BY_TWO * 0.8f);
+}
+
+//-----------------------------------------------------------------------------
+// zoom()
+//-----------------------------------------------------------------------------
+void LLModelPreview::zoom(F32 zoom_amt)
+{
+    F32 new_zoom = mCameraZoom + zoom_amt;
+    // TODO: stop clamping in render
+    static LLCachedControl<F32> zoom_limit(gSavedSettings, "MeshPreviewZoomLimit");
+    mCameraZoom = llclamp(new_zoom, 1.f, zoom_limit());
+}
+
+void LLModelPreview::pan(F32 right, F32 up)
+{
+    bool skin_weight = mViewOption["show_skin_weight"];
+    F32 camera_distance = skin_weight ? SKIN_WEIGHT_CAMERA_DISTANCE : mCameraDistance;
+    mCameraOffset.mV[VY] = llclamp(mCameraOffset.mV[VY] + right * camera_distance / mCameraZoom, -1.f, 1.f);
+    mCameraOffset.mV[VZ] = llclamp(mCameraOffset.mV[VZ] + up * camera_distance / mCameraZoom, -1.f, 1.f);
+}
+
+void LLModelPreview::setPreviewLOD(S32 lod)
+{
+    lod = llclamp(lod, 0, (S32)LLModel::LOD_HIGH);
+
+    if (lod != mPreviewLOD)
+    {
+        mPreviewLOD = lod;
+
+        LLComboBox* combo_box = mFMP->getChild<LLComboBox>("preview_lod_combo");
+        combo_box->setCurrentByIndex((NUM_LOD - 1) - mPreviewLOD); // combo box list of lods is in reverse order
+        mFMP->childSetValue("lod_file_" + lod_name[mPreviewLOD], mLODFile[mPreviewLOD]);
+
+        LLColor4 highlight_color = LLUIColorTable::instance().getColor("MeshImportTableHighlightColor");
+        LLColor4 normal_color = LLUIColorTable::instance().getColor("MeshImportTableNormalColor");
+
+        for (S32 i = 0; i <= LLModel::LOD_HIGH; ++i)
+        {
+            const LLColor4& color = (i == lod) ? highlight_color : normal_color;
+
+            mFMP->childSetColor(lod_status_name[i], color);
+            mFMP->childSetColor(lod_label_name[i], color);
+            mFMP->childSetColor(lod_triangles_name[i], color);
+            mFMP->childSetColor(lod_vertices_name[i], color);
+        }
+
+        LLFloaterModelPreview* fmp = (LLFloaterModelPreview*)mFMP;
+        if (fmp)
+        {
+            // make preview repopulate tab
+            fmp->clearAvatarTab();
+        }
+    }
+    refresh();
+    updateStatusMessages();
+}
+
+//static
+void LLModelPreview::textureLoadedCallback(
+    BOOL success,
+    LLViewerFetchedTexture *src_vi,
+    LLImageRaw* src,
+    LLImageRaw* src_aux,
+    S32 discard_level,
+    BOOL final,
+    void* userdata)
+{
+    LLModelPreview* preview = (LLModelPreview*)userdata;
+    preview->refresh();
+
+    if (final && preview->mModelLoader)
+    {
+        if (preview->mModelLoader->mNumOfFetchingTextures > 0)
+        {
+            preview->mModelLoader->mNumOfFetchingTextures--;
+        }
+    }
+}
+
+// static
+bool LLModelPreview::lodQueryCallback()
+{
+    // not the best solution, but model preview belongs to floater
+    // so it is an easy way to check that preview still exists.
+    LLFloaterModelPreview* fmp = LLFloaterModelPreview::sInstance;
+    if (fmp && fmp->mModelPreview)
+    {
+        LLModelPreview* preview = fmp->mModelPreview;
+        if (preview->mLodsQuery.size() > 0)
+        {
+            S32 lod = preview->mLodsQuery.back();
+            preview->mLodsQuery.pop_back();
+            preview->genLODs(lod);
+
+            // return false to continue cycle
+            return false;
+        }
+    }
+    // nothing to process
+    return true;
+}
+
+void LLModelPreview::onLODParamCommit(S32 lod, bool enforce_tri_limit)
+{
+    if (!mLODFrozen)
+    {
+        genLODs(lod, 3, enforce_tri_limit);
+        refresh();
+    }
+}
+
diff --git a/indra/newview/llmodelpreview.h b/indra/newview/llmodelpreview.h
new file mode 100644
index 0000000000..7a7b8615f9
--- /dev/null
+++ b/indra/newview/llmodelpreview.h
@@ -0,0 +1,308 @@
+/**
+ * @file llmodelpreview.h
+ * @brief LLModelPreview class definition, class
+ * responsible for model preview inside LLFloaterModelPreview
+ *
+ * $LicenseInfo:firstyear=2020&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2020, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLMODELPREVIEW_H
+#define LL_LLMODELPREVIEW_H
+
+#include "lldynamictexture.h"
+#include "llfloatermodelpreview.h"
+#include "llmeshrepository.h"
+#include "llmodel.h"
+
+class LLJoint;
+class LLVOAvatar;
+class LLTextBox;
+class LLVertexBuffer;
+class DAE;
+class daeElement;
+class domProfile_COMMON;
+class domInstance_geometry;
+class domNode;
+class domTranslate;
+class domController;
+class domSkin;
+class domMesh;
+
+// const strings needed by classes that use model preivew
+static const std::string lod_name[NUM_LOD + 1] =
+{
+    "lowest",
+    "low",
+    "medium",
+    "high",
+    "I went off the end of the lod_name array.  Me so smart."
+};
+
+static const std::string lod_triangles_name[NUM_LOD + 1] =
+{
+    "lowest_triangles",
+    "low_triangles",
+    "medium_triangles",
+    "high_triangles",
+    "I went off the end of the lod_triangles_name array.  Me so smart."
+};
+
+static const std::string lod_vertices_name[NUM_LOD + 1] =
+{
+    "lowest_vertices",
+    "low_vertices",
+    "medium_vertices",
+    "high_vertices",
+    "I went off the end of the lod_vertices_name array.  Me so smart."
+};
+
+static const std::string lod_status_name[NUM_LOD + 1] =
+{
+    "lowest_status",
+    "low_status",
+    "medium_status",
+    "high_status",
+    "I went off the end of the lod_status_name array.  Me so smart."
+};
+
+static const std::string lod_icon_name[NUM_LOD + 1] =
+{
+    "status_icon_lowest",
+    "status_icon_low",
+    "status_icon_medium",
+    "status_icon_high",
+    "I went off the end of the lod_status_name array.  Me so smart."
+};
+
+static const std::string lod_status_image[NUM_LOD + 1] =
+{
+    "ModelImport_Status_Good",
+    "ModelImport_Status_Warning",
+    "ModelImport_Status_Error",
+    "I went off the end of the lod_status_image array.  Me so smart."
+};
+
+static const std::string lod_label_name[NUM_LOD + 1] =
+{
+    "lowest_label",
+    "low_label",
+    "medium_label",
+    "high_label",
+    "I went off the end of the lod_label_name array.  Me so smart."
+};
+
+class LLModelPreview : public LLViewerDynamicTexture, public LLMutex
+{
+    LOG_CLASS(LLModelPreview);
+
+    typedef boost::signals2::signal<void(F32 x, F32 y, F32 z, F32 streaming_cost, F32 physics_cost)> details_signal_t;
+    typedef boost::signals2::signal<void(void)> model_loaded_signal_t;
+    typedef boost::signals2::signal<void(bool)> model_updated_signal_t;
+
+public:
+
+    typedef enum
+    {
+        LOD_FROM_FILE = 0,
+        GENERATE,
+        USE_LOD_ABOVE,
+    } eLoDMode;
+
+public:
+    // Todo: model preview shouldn't need floater dependency, it
+    // should just expose data to floater, not control flaoter like it does
+    LLModelPreview(S32 width, S32 height, LLFloater* fmp);
+    virtual ~LLModelPreview();
+
+    void resetPreviewTarget();
+    void setPreviewTarget(F32 distance);
+    void setTexture(U32 name) { mTextureName = name; }
+
+    void setPhysicsFromLOD(S32 lod);
+    BOOL render();
+    void update();
+    void genBuffers(S32 lod, bool skinned);
+    void clearBuffers();
+    void refresh();
+    void rotate(F32 yaw_radians, F32 pitch_radians);
+    void zoom(F32 zoom_amt);
+    void pan(F32 right, F32 up);
+    virtual BOOL needsRender() { return mNeedsUpdate; }
+    void setPreviewLOD(S32 lod);
+    void clearModel(S32 lod);
+    void getJointAliases(JointMap& joint_map);
+    void loadModel(std::string filename, S32 lod, bool force_disable_slm = false);
+    void loadModelCallback(S32 lod);
+    bool lodsReady() { return !mGenLOD && mLodsQuery.empty(); }
+    void queryLODs() { mGenLOD = true; };
+    void genLODs(S32 which_lod = -1, U32 decimation = 3, bool enforce_tri_limit = false);
+    void generateNormals();
+    void restoreNormals();
+    U32 calcResourceCost();
+    void rebuildUploadData();
+    void saveUploadData(bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position);
+    void saveUploadData(const std::string& filename, bool save_skinweights, bool save_joint_positions, bool lock_scale_if_joint_position);
+    void clearIncompatible(S32 lod);
+    void updateStatusMessages();
+    void updateLodControls(S32 lod);
+    void clearGLODGroup();
+    void onLODParamCommit(S32 lod, bool enforce_tri_limit);
+    void addEmptyFace(LLModel* pTarget);
+
+    const bool getModelPivot(void) const { return mHasPivot; }
+    void setHasPivot(bool val) { mHasPivot = val; }
+    void setModelPivot(const LLVector3& pivot) { mModelPivot = pivot; }
+
+    //Is a rig valid so that it can be used as a criteria for allowing for uploading of joint positions
+    //Accessors for joint position upload friendly rigs
+    const bool isRigValidForJointPositionUpload(void) const { return mRigValidJointUpload; }
+    void setRigValidForJointPositionUpload(bool rigValid) { mRigValidJointUpload = rigValid; }
+
+    //Accessors for the legacy rigs
+    const bool isLegacyRigValid(void) const { return mLegacyRigFlags == 0; }
+    U32 getLegacyRigFlags() const { return mLegacyRigFlags; }
+    void setLegacyRigFlags(U32 rigFlags) { mLegacyRigFlags = rigFlags; }
+
+    static void	textureLoadedCallback(BOOL success, LLViewerFetchedTexture *src_vi, LLImageRaw* src, LLImageRaw* src_aux, S32 discard_level, BOOL final, void* userdata);
+    static bool lodQueryCallback();
+
+    boost::signals2::connection setDetailsCallback(const details_signal_t::slot_type& cb){ return mDetailsSignal.connect(cb); }
+    boost::signals2::connection setModelLoadedCallback(const model_loaded_signal_t::slot_type& cb){ return mModelLoadedSignal.connect(cb); }
+    boost::signals2::connection setModelUpdatedCallback(const model_updated_signal_t::slot_type& cb){ return mModelUpdatedSignal.connect(cb); }
+
+    void setLoadState(U32 state) { mLoadState = state; }
+    U32 getLoadState() { return mLoadState; }
+
+    static bool 		sIgnoreLoadedCallback;
+    std::vector<S32> mLodsQuery;
+    std::vector<S32> mLodsWithParsingError;
+    bool mHasDegenerate;
+
+protected:
+
+    static void			loadedCallback(LLModelLoader::scene& scene, LLModelLoader::model_list& model_list, S32 lod, void* opaque);
+    static void			stateChangedCallback(U32 state, void* opaque);
+
+    static LLJoint*	lookupJointByName(const std::string&, void* opaque);
+    static U32			loadTextures(LLImportMaterial& material, void* opaque);
+
+private:
+    //Utility function for controller vertex compare
+    bool verifyCount(int expected, int result);
+    //Creates the dummy avatar for the preview window
+    void		createPreviewAvatar(void);
+    //Accessor for the dummy avatar
+    LLVOAvatar* getPreviewAvatar(void) { return mPreviewAvatar; }
+    // Count amount of original models, excluding sub-models
+    static U32 countRootModels(LLModelLoader::model_list models);
+
+protected:
+    friend class LLModelLoader;
+    friend class LLFloaterModelPreview;
+    friend class LLFloaterModelPreview::DecompRequest;
+    friend class LLPhysicsDecomp;
+
+    LLFloater*  mFMP;
+
+    BOOL        mNeedsUpdate;
+    bool		mDirty;
+    bool		mGenLOD;
+    U32         mTextureName;
+    F32			mCameraDistance;
+    F32			mCameraYaw;
+    F32			mCameraPitch;
+    F32			mCameraZoom;
+    LLVector3	mCameraOffset;
+    LLVector3	mPreviewTarget;
+    LLVector3	mPreviewScale;
+    S32			mPreviewLOD;
+    S32			mPhysicsSearchLOD;
+    U32			mResourceCost;
+    std::string mLODFile[LLModel::NUM_LODS];
+    bool		mLoading;
+    U32			mLoadState;
+    bool		mResetJoints;
+    bool		mModelNoErrors;
+
+    std::map<std::string, bool> mViewOption;
+
+    //GLOD object parameters (must rebuild object if these change)
+    bool mLODFrozen;
+    F32 mBuildShareTolerance;
+    U32 mBuildQueueMode;
+    U32 mBuildOperator;
+    U32 mBuildBorderMode;
+    U32 mRequestedLoDMode[LLModel::NUM_LODS];
+    S32 mRequestedTriangleCount[LLModel::NUM_LODS];
+    F32 mRequestedErrorThreshold[LLModel::NUM_LODS];
+    U32 mRequestedBuildOperator[LLModel::NUM_LODS];
+    U32 mRequestedQueueMode[LLModel::NUM_LODS];
+    U32 mRequestedBorderMode[LLModel::NUM_LODS];
+    F32 mRequestedShareTolerance[LLModel::NUM_LODS];
+    F32 mRequestedCreaseAngle[LLModel::NUM_LODS];
+
+    LLModelLoader* mModelLoader;
+
+    LLModelLoader::scene mScene[LLModel::NUM_LODS];
+    LLModelLoader::scene mBaseScene;
+
+    LLModelLoader::model_list mModel[LLModel::NUM_LODS];
+    LLModelLoader::model_list mBaseModel;
+
+    typedef std::vector<LLVolumeFace>		v_LLVolumeFace_t;
+    typedef std::vector<v_LLVolumeFace_t>	vv_LLVolumeFace_t;
+
+    vv_LLVolumeFace_t mModelFacesCopy[LLModel::NUM_LODS];
+    vv_LLVolumeFace_t mBaseModelFacesCopy;
+
+    U32 mGroup;
+    std::map<LLPointer<LLModel>, U32> mObject;
+    U32 mMaxTriangleLimit;
+
+    LLMeshUploadThread::instance_list mUploadData;
+    std::set<LLViewerFetchedTexture * > mTextureSet;
+
+    //map of vertex buffers to models (one vertex buffer in vector per face in model
+    std::map<LLModel*, std::vector<LLPointer<LLVertexBuffer> > > mVertexBuffer[LLModel::NUM_LODS + 1];
+
+    details_signal_t mDetailsSignal;
+    model_loaded_signal_t mModelLoadedSignal;
+    model_updated_signal_t mModelUpdatedSignal;
+
+    LLVector3	mModelPivot;
+    bool		mHasPivot;
+
+    float		mPelvisZOffset;
+
+    bool		mRigValidJointUpload;
+    U32			mLegacyRigFlags;
+
+    bool		mLastJointUpdate;
+
+    JointNameSet		mJointsFromNode;
+    JointTransformMap	mJointTransformMap;
+
+    LLPointer<LLVOAvatar>	mPreviewAvatar;
+    LLCachedControl<bool>	mImporterDebug;
+};
+
+#endif  // LL_LLMODELPREVIEW_H