5 files changed, 92 insertions, 6 deletions

diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp
index ee2d57a562..8d6b3b926c 100755
--- a/indra/llmath/llvolume.cpp
+++ b/indra/llmath/llvolume.cpp
@@ -2685,6 +2685,17 @@ void LLVolume::setMeshAssetLoaded(BOOL loaded)
 	mIsMeshAssetLoaded = loaded;
 }
 
+void LLVolume::copyFacesTo(std::vector<LLVolumeFace> &faces) const 
+{
+	faces = mVolumeFaces;
+}
+
+void LLVolume::copyFacesFrom(const std::vector<LLVolumeFace> &faces)
+{
+	mVolumeFaces = std::move(faces);
+	mSculptLevel = 0;
+}
+
 void LLVolume::copyVolumeFaces(const LLVolume* volume)
 {
 	mVolumeFaces = volume->mVolumeFaces;
diff --git a/indra/llmath/llvolume.h b/indra/llmath/llvolume.h
index 2f38ae7203..c8476f6897 100755
--- a/indra/llmath/llvolume.h
+++ b/indra/llmath/llvolume.h
@@ -993,6 +993,7 @@ public:
 	void resizePath(S32 length);
 	const LLAlignedArray<LLVector4a,64>&	getMesh() const				{ return mMesh; }
 	const LLVector4a& getMeshPt(const U32 i) const			{ return mMesh[i]; }
+	
 
 	void setDirty() { mPathp->setDirty(); mProfilep->setDirty(); }
 
@@ -1045,6 +1046,8 @@ public:
 	
 	void sculpt(U16 sculpt_width, U16 sculpt_height, S8 sculpt_components, const U8* sculpt_data, S32 sculpt_level);
 	void copyVolumeFaces(const LLVolume* volume);
+	void copyFacesTo(std::vector<LLVolumeFace> &faces) const;
+	void copyFacesFrom(const std::vector<LLVolumeFace> &faces);
 	void cacheOptimize();
 
 private:
diff --git a/indra/llprimitive/llmodel.cpp b/indra/llprimitive/llmodel.cpp
index 1f96d1557d..e0294cfd6a 100755
--- a/indra/llprimitive/llmodel.cpp
+++ b/indra/llprimitive/llmodel.cpp
@@ -2012,7 +2012,7 @@ bool LLModel::loadModel(std::istream& is)
 		}
 	}
 
-	std::string nm[] = 
+	static const std::string nm[] = 
 	{
 		"lowest_lod",
 		"low_lod",
diff --git a/indra/newview/llfloatermodelpreview.cpp b/indra/newview/llfloatermodelpreview.cpp
index 73bf7f3e23..f0c580c8ee 100755
--- a/indra/newview/llfloatermodelpreview.cpp
+++ b/indra/newview/llfloatermodelpreview.cpp
@@ -738,6 +738,11 @@ void LLFloaterModelPreview::toggleGenarateNormals()
 {
 	bool enabled = childGetValue("gen_normals").asBoolean();
 	childSetEnabled("crease_angle", enabled);
+	if(enabled) {
+		mModelPreview->generateNormals();
+	} else {
+		mModelPreview->restoreNormals();
+	}
 }
 
 //static
@@ -3836,7 +3841,6 @@ void LLModelPreview::generateNormals()
 
 	S32 which_lod = mPreviewLOD;
 
-
 	if (which_lod > 4 || which_lod < 0 ||
 		mModel[which_lod].empty())
 	{
@@ -3851,18 +3855,79 @@ void LLModelPreview::generateNormals()
 
 	if (which_lod == 3 && !mBaseModel.empty())
 	{
-		for (LLModelLoader::model_list::iterator iter = mBaseModel.begin(); iter != mBaseModel.end(); ++iter)
+		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(std::move(faces));
+			}
+		}
+
+		for (LLModelLoader::model_list::iterator it = mBaseModel.begin(), itE = mBaseModel.end(); it != itE; ++it)
 		{
-			(*iter)->generateNormals(angle_cutoff);
+			(*it)->generateNormals(angle_cutoff);
 		}
 
 		mVertexBuffer[5].clear();
 	}
 
-	for (LLModelLoader::model_list::iterator iter = mModel[which_lod].begin(); iter != mModel[which_lod].end(); ++iter)
+	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)
 	{
-		(*iter)->generateNormals(angle_cutoff);
+		if(perform_copy)
+		{
+			v_LLVolumeFace_t faces;
+			(*it)->copyFacesTo(faces);
+			mModelFacesCopy[which_lod].push_back(std::move(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();
diff --git a/indra/newview/llfloatermodelpreview.h b/indra/newview/llfloatermodelpreview.h
index 6c0c60b87f..618748bd4e 100755
--- a/indra/newview/llfloatermodelpreview.h
+++ b/indra/newview/llfloatermodelpreview.h
@@ -343,6 +343,7 @@ public:
 	void loadModelCallback(S32 lod);
 	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_poisitions);
@@ -447,6 +448,12 @@ private:
 	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;