3 files changed, 30 insertions, 17 deletions

diff --git a/indra/newview/llviewerregion.cpp b/indra/newview/llviewerregion.cpp
index afc00764b8..06f9af8751 100755
--- a/indra/newview/llviewerregion.cpp
+++ b/indra/newview/llviewerregion.cpp
@@ -1131,6 +1131,8 @@ void LLViewerRegion::updateVisibleEntries(F32 max_time)
 	//
 	//object projected area threshold
 	F32 projection_threshold = LLVOCacheEntry::getSquaredPixelThreshold(mImpl->mVOCachePartition->isFrontCull());
+	F32 dist_threshold = mImpl->mVOCachePartition->isFrontCull() ? gAgentCamera.mDrawDistance : LLVOCacheEntry::sRearFarRadius;
+	
 	std::set< LLPointer<LLViewerOctreeGroup> >::iterator group_iter = mImpl->mVisibleGroups.begin();
 	for(; group_iter != mImpl->mVisibleGroups.end(); ++group_iter)
 	{
@@ -1153,7 +1155,7 @@ void LLViewerRegion::updateVisibleEntries(F32 max_time)
 					continue;
 				}
 
-				vo_entry->calcSceneContribution(local_origin, needs_update, last_update);
+				vo_entry->calcSceneContribution(local_origin, needs_update, last_update, dist_threshold);
 				if(vo_entry->getSceneContribution() > projection_threshold)
 				{
 					mImpl->mWaitingList.insert(vo_entry);			
@@ -1389,10 +1391,9 @@ void LLViewerRegion::killInvisibleObjects(F32 max_time)
 
 	LLTimer update_timer;
 	LLVector4a camera_origin;
-	camera_origin.load3(LLViewerCamera::getInstance()->getOrigin().mV);
-	F32 squared_back_threshold = LLVOCacheEntry::sRearFarRadius;
-	squared_back_threshold *= squared_back_threshold;
-
+	camera_origin.load3(LLViewerCamera::getInstance()->getOrigin().mV);	
+	F32 back_threshold = LLVOCacheEntry::sRearFarRadius;
+	
 	bool unstable = sNewObjectCreationThrottle < 0;
 	size_t max_update = unstable ? mImpl->mActiveSet.size() : 64; 
 	if(!mInvisibilityCheckHistory && isViewerCameraStatic())
@@ -1411,8 +1412,12 @@ void LLViewerRegion::killInvisibleObjects(F32 max_time)
 		{
 			iter = mImpl->mActiveSet.begin();
 		}
+		if((*iter)->getParentID() > 0)
+		{
+			continue; //skip child objects, they are removed with their parent.
+		}
 
-		if(!(*iter)->isAnyVisible(camera_origin, squared_back_threshold) && (unstable || (*iter)->mLastCameraUpdated < sLastCameraUpdated))
+		if(!(*iter)->isAnyVisible(camera_origin, back_threshold) && (unstable || (*iter)->mLastCameraUpdated < sLastCameraUpdated))
 		{
 			killObject((*iter), delete_list);
 		}
diff --git a/indra/newview/llvocache.cpp b/indra/newview/llvocache.cpp
index 3bacf5c319..789321e523 100755
--- a/indra/newview/llvocache.cpp
+++ b/indra/newview/llvocache.cpp
@@ -391,7 +391,7 @@ F32 LLVOCacheEntry::getSquaredPixelThreshold(bool is_front)
 	return projection_threshold;
 }
 
-bool LLVOCacheEntry::isAnyVisible(const LLVector4a& camera_origin, F32 squared_dist_threshold)
+bool LLVOCacheEntry::isAnyVisible(const LLVector4a& camera_origin, F32 dist_threshold)
 {
 	LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)getGroup();
 	if(!group)
@@ -412,19 +412,17 @@ bool LLVOCacheEntry::isAnyVisible(const LLVector4a& camera_origin, F32 squared_d
 	if(!vis && !mParentID)
 	{
 		LLVector4a lookAt;
+
 		lookAt.setSub(getPositionGroup(), camera_origin);
-		F32 squared_dist = lookAt.dot3(lookAt).getF32();
-		F32 rad = getBinRadius();
-		rad *= rad;
-		
-		//rough estimation
-		vis = (squared_dist - rad < squared_dist_threshold);
+		dist_threshold += getBinRadius();		
+
+		vis = (lookAt.dot3(lookAt).getF32() < dist_threshold * dist_threshold);
 	}
 
 	return vis;
 }
 
-void LLVOCacheEntry::calcSceneContribution(const LLVector4a& camera_origin, bool needs_update, U32 last_update)
+void LLVOCacheEntry::calcSceneContribution(const LLVector4a& camera_origin, bool needs_update, U32 last_update, F32 dist_threshold)
 {
 	if(!needs_update && getVisible() >= last_update)
 	{
@@ -444,7 +442,17 @@ void LLVOCacheEntry::calcSceneContribution(const LLVector4a& camera_origin, bool
 	else
 	{
 		F32 rad = getBinRadius();
-		mSceneContrib = rad * rad / squared_dist;
+		dist_threshold += rad;
+		dist_threshold *= dist_threshold;
+
+		if(squared_dist < dist_threshold)
+		{
+			mSceneContrib = rad * rad / squared_dist;		
+		}
+		else
+		{
+			mSceneContrib = 0.f; //out of draw distance, not to load
+		}
 	}
 
 	setVisible();
diff --git a/indra/newview/llvocache.h b/indra/newview/llvocache.h
index 9d851288b4..500f102d2c 100755
--- a/indra/newview/llvocache.h
+++ b/indra/newview/llvocache.h
@@ -85,14 +85,14 @@ public:
 	bool hasState(U32 state)   {return mState & state;}
 	U32  getState() const      {return mState;}
 	
-	bool isAnyVisible(const LLVector4a& camera_origin, F32 squared_dist_threshold);
+	bool isAnyVisible(const LLVector4a& camera_origin, F32 dist_threshold);
 
 	U32 getLocalID() const			{ return mLocalID; }
 	U32 getCRC() const				{ return mCRC; }
 	S32 getHitCount() const			{ return mHitCount; }
 	S32 getCRCChangeCount() const	{ return mCRCChangeCount; }
 	
-	void calcSceneContribution(const LLVector4a& camera_origin, bool needs_update, U32 last_update);
+	void calcSceneContribution(const LLVector4a& camera_origin, bool needs_update, U32 last_update, F32 dist_threshold);
 	void setSceneContribution(F32 scene_contrib) {mSceneContrib = scene_contrib;}
 	F32 getSceneContribution() const             { return mSceneContrib;}