3 files changed, 18 insertions, 6 deletions

diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 305aaf2a3a..14e96a06cc 100755
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -765,6 +765,17 @@
       <key>Value</key>
       <real>0.0311</real>
     </map>
+    <key>BackShpereCullingRadius</key>
+    <map>
+      <key>Comment</key>
+      <string>Radius of back sphere in meters, objects behind camera but within this radius are loaded for rendering</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>F32</string>
+      <key>Value</key>
+      <real>20.0</real>
+    </map>
     <key>BottomPanelNew</key>
     <map>
       <key>Comment</key>
diff --git a/indra/newview/llvocache.cpp b/indra/newview/llvocache.cpp
index 20e69cbea9..ada412be8c 100755
--- a/indra/newview/llvocache.cpp
+++ b/indra/newview/llvocache.cpp
@@ -640,11 +640,11 @@ private:
 class LLVOCacheOctreeBackCull : public LLViewerOctreeCull
 {
 public:
-	LLVOCacheOctreeBackCull(LLCamera* camera, const LLVector3& shift, LLViewerRegion* regionp) 
+	LLVOCacheOctreeBackCull(LLCamera* camera, const LLVector3& shift, LLViewerRegion* regionp, F32 back_sphere_radius) 
 		: LLViewerOctreeCull(camera), mRegionp(regionp)
 	{
 		mLocalShift = shift;
-		mSphereRadius = 20.f; //20m
+		mSphereRadius = back_sphere_radius;
 	}
 
 	virtual S32 frustumCheck(const LLviewerOctreeGroup* group)
@@ -678,7 +678,7 @@ private:
 	LLVector3        mLocalShift; //shift vector from agent space to local region space.
 };
 
-void LLVOCachePartition::selectBackObjects(LLCamera &camera)
+void LLVOCachePartition::selectBackObjects(LLCamera &camera, F32 back_sphere_radius)
 {
 	if(LLViewerCamera::sCurCameraID != LLViewerCamera::CAMERA_WORLD)
 	{
@@ -699,7 +699,7 @@ void LLVOCachePartition::selectBackObjects(LLCamera &camera)
 	//localize the camera
 	LLVector3 region_agent = mRegionp->getOriginAgent();
 	
-	LLVOCacheOctreeBackCull culler(&camera, region_agent, mRegionp);
+	LLVOCacheOctreeBackCull culler(&camera, region_agent, mRegionp, back_sphere_radius);
 	culler.traverse(mOctree);
 
 	mBackSlectionEnabled--;
@@ -714,6 +714,7 @@ void LLVOCachePartition::selectBackObjects(LLCamera &camera)
 S32 LLVOCachePartition::cull(LLCamera &camera, bool do_occlusion)
 {
 	static LLCachedControl<bool> use_object_cache_occlusion(gSavedSettings,"UseObjectCacheOcclusion");
+	static LLCachedControl<F32> back_sphere_radius(gSavedSettings,"BackShpereCullingRadius");
 	
 	if(!LLViewerRegion::sVOCacheCullingEnabled)
 	{
@@ -745,7 +746,7 @@ S32 LLVOCachePartition::cull(LLCamera &camera, bool do_occlusion)
 		}
 		if(LLViewerOctreeEntryData::getCurrentFrame() % seed != mIdleHash)
 		{
-			selectBackObjects(camera);//process back objects selection
+			selectBackObjects(camera, back_sphere_radius);//process back objects selection
 			return 0; //nothing changed, reduce frequency of culling
 		}
 	}
diff --git a/indra/newview/llvocache.h b/indra/newview/llvocache.h
index 16ed05dc94..b58bb3d499 100755
--- a/indra/newview/llvocache.h
+++ b/indra/newview/llvocache.h
@@ -186,7 +186,7 @@ public:
 	void removeOccluder(LLVOCacheGroup* group);
 
 private:
-	void selectBackObjects(LLCamera &camera); //select objects behind camera.
+	void selectBackObjects(LLCamera &camera, F32 back_sphere_radius); //select objects behind camera.
 
 public:
 	static BOOL sNeedsOcclusionCheck;