diff --git a/src/Bullet3Common/shared/b3Int2.h b/src/Bullet3Common/shared/b3Int2.h
index 6b73e2eaa..ec886de18 100644
--- a/src/Bullet3Common/shared/b3Int2.h
+++ b/src/Bullet3Common/shared/b3Int2.h
@@ -46,5 +46,11 @@ struct b3Int2
 	};
 };
 
+inline b3Int2 b3MakeInt2(int x, int y)
+{
+	b3Int2 v;
+	v.s[0] = x; v.s[1] = y;
+	return v;
+}
 
 #endif
\ No newline at end of file
diff --git a/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp b/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
index ef66cf34b..b2a756734 100644
--- a/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
+++ b/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
@@ -19,6 +19,7 @@ subject to the following restrictions:
 ///And contact clipping based on work from Simon Hobbs
 
 //#define B3_DEBUG_SAT_FACE
+
 //#define CHECK_ON_HOST
 
 #ifdef CHECK_ON_HOST
@@ -1368,6 +1369,23 @@ void computeContactPlaneConvex(int pairIndex,
 
 
 
+B3_FORCE_INLINE b3Vector3	MyUnQuantize(const unsigned short* vecIn, const b3Vector3& quantization, const b3Vector3& bvhAabbMin)
+	{
+			b3Vector3	vecOut;
+			vecOut.setValue(
+			(b3Scalar)(vecIn[0]) / (quantization.getX()),
+			(b3Scalar)(vecIn[1]) / (quantization.getY()),
+			(b3Scalar)(vecIn[2]) / (quantization.getZ()));
+			vecOut += bvhAabbMin;
+			return vecOut;
+	}
+
+void traverseTreeTree()
+{
+
+}
+
+
 // work-in-progress
 __kernel void   findCompoundPairsKernel( 
 	int pairIndex,
@@ -1384,7 +1402,10 @@ __kernel void   findCompoundPairsKernel(
 	__global const b3GpuChildShape* gpuChildShapes,
 	__global b3Int4* gpuCompoundPairsOut,
 	__global  int* numCompoundPairsOut,
-	int maxNumCompoundPairsCapacity
+	int maxNumCompoundPairsCapacity,
+	b3AlignedObjectArray<b3QuantizedBvhNode>&	treeNodesCPU,
+	b3AlignedObjectArray<b3BvhSubtreeInfo>&	subTreesCPU,
+	b3AlignedObjectArray<b3BvhInfo>&	bvhInfoCPU
 	)
 {
 
@@ -1403,6 +1424,186 @@ __kernel void   findCompoundPairsKernel(
 			return;
 		}
 
+		if ((collidables[collidableIndexA].m_shapeType==SHAPE_COMPOUND_OF_CONVEX_HULLS) &&(collidables[collidableIndexB].m_shapeType==SHAPE_COMPOUND_OF_CONVEX_HULLS))
+		{
+			int bvhA = collidables[collidableIndexA].m_compoundBvhIndex;
+			int bvhB = collidables[collidableIndexB].m_compoundBvhIndex;
+			int numSubTreesA = bvhInfoCPU[bvhA].m_numSubTrees;
+			int subTreesOffsetA = bvhInfoCPU[bvhA].m_subTreeOffset;
+			int subTreesOffsetB = bvhInfoCPU[bvhB].m_subTreeOffset;
+
+
+			int numSubTreesB = bvhInfoCPU[bvhB].m_numSubTrees;
+			
+			float4 posA = rigidBodies[bodyIndexA].m_pos;
+			b3Quat ornA = rigidBodies[bodyIndexA].m_quat;
+
+			b3Transform transA;
+			transA.setIdentity();
+			transA.setOrigin(posA);
+			transA.setRotation(ornA);
+
+			b3Quat ornB = rigidBodies[bodyIndexB].m_quat;
+			float4 posB = rigidBodies[bodyIndexB].m_pos;
+
+			b3Transform transB;
+			transB.setIdentity();
+			transB.setOrigin(posB);
+			transB.setRotation(ornB);
+
+
+
+			for (int p=0;p<numSubTreesA;p++)
+			{
+				b3BvhSubtreeInfo subtreeA = subTreesCPU[subTreesOffsetA+p];
+				//bvhInfoCPU[bvhA].m_quantization
+				b3Vector3 treeAminLocal = MyUnQuantize(subtreeA.m_quantizedAabbMin,bvhInfoCPU[bvhA].m_quantization,bvhInfoCPU[bvhA].m_aabbMin);
+				b3Vector3 treeAmaxLocal = MyUnQuantize(subtreeA.m_quantizedAabbMax,bvhInfoCPU[bvhA].m_quantization,bvhInfoCPU[bvhA].m_aabbMin);
+
+				b3Vector3 aabbAMinOut,aabbAMaxOut;
+				float margin=0.f;
+				b3TransformAabb(treeAminLocal,treeAmaxLocal, margin,transA,aabbAMinOut,aabbAMaxOut);
+
+				for (int q=0;q<numSubTreesB;q++)
+				{
+					b3BvhSubtreeInfo subtreeB = subTreesCPU[subTreesOffsetB+q];
+
+					b3Vector3 treeBminLocal = MyUnQuantize(subtreeB.m_quantizedAabbMin,bvhInfoCPU[bvhB].m_quantization,bvhInfoCPU[bvhB].m_aabbMin);
+					b3Vector3 treeBmaxLocal = MyUnQuantize(subtreeB.m_quantizedAabbMax,bvhInfoCPU[bvhB].m_quantization,bvhInfoCPU[bvhB].m_aabbMin);
+
+					b3Vector3 aabbBMinOut,aabbBMaxOut;
+					float margin=0.f;
+					b3TransformAabb(treeBminLocal,treeBmaxLocal, margin,transB,aabbBMinOut,aabbBMaxOut);
+
+					bool aabbOverlap = b3TestAabbAgainstAabb2(aabbAMinOut,aabbAMaxOut,aabbBMinOut,aabbBMaxOut);
+					if (aabbOverlap)
+					{
+						
+						int startNodeIndexA = subtreeA.m_rootNodeIndex;
+						int endNodeIndexA = subtreeA.m_rootNodeIndex+subtreeA.m_subtreeSize;
+
+						int startNodeIndexB = subtreeB.m_rootNodeIndex;
+						int endNodeIndexB = subtreeB.m_rootNodeIndex+subtreeB.m_subtreeSize;
+
+						b3AlignedObjectArray<b3Int2> nodeStack;
+						b3Int2 node0;
+						node0.x = startNodeIndexA;
+						node0.y = startNodeIndexB;
+
+						int maxStackDepth = 1024;
+						nodeStack.resize(maxStackDepth);
+						int depth=0;
+						nodeStack[depth++]=node0;
+
+						do
+						{
+							b3Int2 node = nodeStack[--depth];
+
+							b3Vector3 aMinLocal = MyUnQuantize(treeNodesCPU[node.x].m_quantizedAabbMin,bvhInfoCPU[bvhA].m_quantization,bvhInfoCPU[bvhA].m_aabbMin);
+							b3Vector3 aMaxLocal = MyUnQuantize(treeNodesCPU[node.x].m_quantizedAabbMax,bvhInfoCPU[bvhA].m_quantization,bvhInfoCPU[bvhA].m_aabbMin);
+
+							b3Vector3 bMinLocal = MyUnQuantize(treeNodesCPU[node.y].m_quantizedAabbMin,bvhInfoCPU[bvhB].m_quantization,bvhInfoCPU[bvhB].m_aabbMin);
+							b3Vector3 bMaxLocal = MyUnQuantize(treeNodesCPU[node.y].m_quantizedAabbMax,bvhInfoCPU[bvhB].m_quantization,bvhInfoCPU[bvhB].m_aabbMin);
+
+							float margin=0.f;
+							b3Vector3 aabbAMinOut,aabbAMaxOut;
+							b3TransformAabb(aMinLocal,aMaxLocal, margin,transA,aabbAMinOut,aabbAMaxOut);
+
+							b3Vector3 aabbBMinOut,aabbBMaxOut;
+							b3TransformAabb(bMinLocal,bMaxLocal, margin,transB,aabbBMinOut,aabbBMaxOut);
+
+							bool nodeOverlap = b3TestAabbAgainstAabb2(aabbAMinOut,aabbAMaxOut,aabbBMinOut,aabbBMaxOut);
+							if (nodeOverlap)
+							{
+								bool isLeafA = treeNodesCPU[node.x].isLeafNode();
+								bool isLeafB = treeNodesCPU[node.y].isLeafNode();
+								bool isInternalA = !isLeafA;
+								bool isInternalB = !isLeafB;
+
+								//fail, even though it might hit two leaf nodes
+								if (depth+4>maxStackDepth && !(isLeafA && isLeafB))
+								{
+									b3Error("Error: traversal exceeded maxStackDepth\n");
+									continue;
+								}
+
+								if(isInternalA)
+								{
+									int nodeAleftChild = node.x+1;
+									bool isNodeALeftChildLeaf = treeNodesCPU[node.x+1].isLeafNode();
+									int nodeArightChild = isNodeALeftChildLeaf? node.x+2 : node.x + treeNodesCPU[node.x+1].getEscapeIndex();
+
+									if(isInternalB)
+									{					
+										int nodeBleftChild = node.y+1;
+										bool isNodeBLeftChildLeaf = treeNodesCPU[node.y+1].isLeafNode();
+										int nodeBrightChild = isNodeBLeftChildLeaf? node.y+2 : node.y + treeNodesCPU[node.y+1].getEscapeIndex();
+
+										nodeStack[depth++] = b3MakeInt2(nodeAleftChild, nodeBleftChild);
+										nodeStack[depth++] = b3MakeInt2(nodeArightChild, nodeBleftChild);
+										nodeStack[depth++] = b3MakeInt2(nodeAleftChild, nodeBrightChild);
+										nodeStack[depth++] = b3MakeInt2(nodeArightChild, nodeBrightChild);
+									}
+									else
+									{
+										nodeStack[depth++] = b3MakeInt2(nodeAleftChild,node.y);
+										nodeStack[depth++] = b3MakeInt2(nodeArightChild,node.y);
+									}
+								}
+								else
+								{
+									if(isInternalB)
+									{
+										int nodeBleftChild = node.y+1;
+										bool isNodeBLeftChildLeaf = treeNodesCPU[node.y+1].isLeafNode();
+										int nodeBrightChild = isNodeBLeftChildLeaf? node.y+2 : node.y + treeNodesCPU[node.y+1].getEscapeIndex();
+										nodeStack[depth++] = b3MakeInt2(node.x,nodeBleftChild);
+										nodeStack[depth++] = b3MakeInt2(node.x,nodeBrightChild);
+									}
+									else
+									{
+										int compoundPairIdx = b3AtomicInc(numCompoundPairsOut);
+										if (compoundPairIdx<maxNumCompoundPairsCapacity)
+										{
+											int childShapeIndexA = treeNodesCPU[node.x].getTriangleIndex();
+											int childShapeIndexB = treeNodesCPU[node.y].getTriangleIndex();
+											gpuCompoundPairsOut[compoundPairIdx]  = b3MakeInt4(bodyIndexA,bodyIndexB,childShapeIndexA,childShapeIndexB);
+										}
+									}
+								}
+							}
+						} while (depth);
+					}
+
+					/*
+					for (i=0;i<this->m_SubtreeHeaders.size();i++)
+					{
+						const b3BvhSubtreeInfo& subtree = m_SubtreeHeaders[i];
+
+						//PCK: unsigned instead of bool
+						unsigned overlap = b3TestQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,subtree.m_quantizedAabbMin,subtree.m_quantizedAabbMax);
+						if (overlap != 0)
+						{
+							walkStacklessQuantizedTree(nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax,
+								subtree.m_rootNodeIndex,
+								subtree.m_rootNodeIndex+subtree.m_subtreeSize);
+						}
+					}
+					*/
+					
+					/*bvhInfoCPU[bvhA].m_numNodes;
+					bvhInfoCPU[bvhA].m_nodeOffset
+
+					b3AlignedObjectArray<b3Int2> nodeStack;
+					b3Int2 n;n.x = 
+					nodeStack.push_back(
+					*/
+
+				}
+			}
+			return;
+		}
+
 		if ((collidables[collidableIndexA].m_shapeType==SHAPE_COMPOUND_OF_CONVEX_HULLS) ||(collidables[collidableIndexB].m_shapeType==SHAPE_COMPOUND_OF_CONVEX_HULLS))
 		{
 
@@ -1847,7 +2048,11 @@ void computeContactCompoundCompound(int pairIndex,
 																
 																b3Contact4* globalContactsOut,
 																int& nGlobalContactsOut,
-																int maxContactCapacity)
+																int maxContactCapacity,
+																b3AlignedObjectArray<b3QuantizedBvhNode>&	treeNodesCPU,
+																b3AlignedObjectArray<b3BvhSubtreeInfo>&	subTreesCPU,
+																b3AlignedObjectArray<b3BvhInfo>&	bvhInfoCPU
+																)
 {
 
 	int shapeTypeB = collidables[collidableIndexB].m_shapeType;
@@ -1858,7 +2063,6 @@ void computeContactCompoundCompound(int pairIndex,
 	int maxNumCompoundPairsCapacity = 1024;
 	cpuCompoundPairsOut.resize(maxNumCompoundPairsCapacity);
 
-
 	// work-in-progress
 	findCompoundPairsKernel( 
 							pairIndex,
@@ -1873,7 +2077,11 @@ void computeContactCompoundCompound(int pairIndex,
 							cpuChildShapes,
 							&cpuCompoundPairsOut[0],
 							&numCompoundPairsOut,
-							maxNumCompoundPairsCapacity	);
+							maxNumCompoundPairsCapacity	,
+							treeNodesCPU,
+							subTreesCPU,
+							bvhInfoCPU
+							);
 
 	b3AlignedObjectArray<b3Float4> cpuCompoundSepNormalsOut;
 	b3AlignedObjectArray<int> cpuHasCompoundSepNormalsOut;
@@ -2543,7 +2751,7 @@ void GpuSatCollision::computeConvexConvexContactsGPUSAT( b3OpenCLArray<b3Int4>*
             b3OpenCLArray<b3Vector3>& worldNormalsAGPU,
             b3OpenCLArray<b3Vector3>& worldVertsA1GPU,
             b3OpenCLArray<b3Vector3>& worldVertsB2GPU,    
-			b3AlignedObjectArray<class b3OptimizedBvh*>& bvhData,
+			b3AlignedObjectArray<class b3OptimizedBvh*>& bvhDataUnused,
 			b3OpenCLArray<b3QuantizedBvhNode>*	treeNodesGPU,
 			b3OpenCLArray<b3BvhSubtreeInfo>*	subTreesGPU,
 			b3OpenCLArray<b3BvhInfo>*	bvhInfo,
@@ -2560,6 +2768,17 @@ void GpuSatCollision::computeConvexConvexContactsGPUSAT( b3OpenCLArray<b3Int4>*
 
 
 #ifdef CHECK_ON_HOST
+
+
+	b3AlignedObjectArray<b3QuantizedBvhNode>	treeNodesCPU;
+	treeNodesGPU->copyToHost(treeNodesCPU);
+
+	b3AlignedObjectArray<b3BvhSubtreeInfo>	subTreesCPU;
+	subTreesGPU->copyToHost(subTreesCPU);
+
+	b3AlignedObjectArray<b3BvhInfo>	bvhInfoCPU;
+	bvhInfo->copyToHost(bvhInfoCPU);
+
 	b3AlignedObjectArray<b3Aabb> hostAabbsWorldSpace;
 	clAabbsWorldSpace.copyToHost(hostAabbsWorldSpace);
 
@@ -2655,7 +2874,8 @@ void GpuSatCollision::computeConvexConvexContactsGPUSAT( b3OpenCLArray<b3Int4>*
 			hostCollidables[collidableIndexB].m_shapeType == SHAPE_COMPOUND_OF_CONVEX_HULLS)
 		{
 			computeContactCompoundCompound(i,bodyIndexB,bodyIndexA,collidableIndexB,collidableIndexA,&hostBodyBuf[0],
-			&hostCollidables[0],&hostConvexData[0],&cpuChildShapes[0], hostAabbsWorldSpace,hostAabbsLocalSpace,hostVertices,hostUniqueEdges,hostIndices,hostFaces,&hostContacts[0],nContacts,maxContactCapacity);
+			&hostCollidables[0],&hostConvexData[0],&cpuChildShapes[0], hostAabbsWorldSpace,hostAabbsLocalSpace,hostVertices,hostUniqueEdges,hostIndices,hostFaces,&hostContacts[0],
+			nContacts,maxContactCapacity,treeNodesCPU,subTreesCPU,bvhInfoCPU);	
 //			printf("convex-plane\n");
 			
 		}
diff --git a/src/Bullet3OpenCL/RigidBody/b3GpuNarrowPhase.cpp b/src/Bullet3OpenCL/RigidBody/b3GpuNarrowPhase.cpp
index faa468086..17855fbd8 100644
--- a/src/Bullet3OpenCL/RigidBody/b3GpuNarrowPhase.cpp
+++ b/src/Bullet3OpenCL/RigidBody/b3GpuNarrowPhase.cpp
@@ -13,6 +13,8 @@
 #include "Bullet3OpenCL/NarrowphaseCollision/b3BvhInfo.h"
 
 #include "b3GpuNarrowPhaseInternalData.h"
+#include "Bullet3OpenCL/NarrowphaseCollision/b3QuantizedBvh.h"
+
 
 
 
@@ -417,8 +419,9 @@ int		b3GpuNarrowPhase::registerCompoundShape(b3AlignedObjectArray<b3GpuChildShap
 
 	b3Collidable& col = getCollidableCpu(collidableIndex);
 	col.m_shapeType = SHAPE_COMPOUND_OF_CONVEX_HULLS;
-	
 	col.m_shapeIndex = m_data->m_cpuChildShapes.size();
+	col.m_compoundBvhIndex = m_data->m_bvhInfoCPU.size();
+
 	{
 		b3Assert(col.m_shapeIndex+childShapes->size()<m_data->m_config.m_maxCompoundChildShapes);
 		for (int i=0;i<childShapes->size();i++)
@@ -432,10 +435,13 @@ int		b3GpuNarrowPhase::registerCompoundShape(b3AlignedObjectArray<b3GpuChildShap
 	col.m_numChildShapes = childShapes->size();
 	
 	
-	b3SapAabb aabbWS;
+	b3SapAabb aabbLocalSpace;
 	b3Vector3 myAabbMin(1e30f,1e30f,1e30f);
 	b3Vector3 myAabbMax(-1e30f,-1e30f,-1e30f);
 	
+	b3AlignedObjectArray<b3Aabb> childLocalAabbs;
+	childLocalAabbs.resize(childShapes->size());
+
 	//compute local AABB of the compound of all children
 	for (int i=0;i<childShapes->size();i++)
 	{
@@ -460,19 +466,109 @@ int		b3GpuNarrowPhase::registerCompoundShape(b3AlignedObjectArray<b3GpuChildShap
 		b3TransformAabb(childLocalAabbMin,childLocalAabbMax,margin,childTr,aMin,aMax);
 		myAabbMin.setMin(aMin);
 		myAabbMax.setMax(aMax);		
+		childLocalAabbs[i].m_min[0] = aMin[0];
+		childLocalAabbs[i].m_min[1] = aMin[1];
+		childLocalAabbs[i].m_min[2] = aMin[2];
+		childLocalAabbs[i].m_min[3] = 0;
+		childLocalAabbs[i].m_max[0] = aMax[0];
+		childLocalAabbs[i].m_max[1] = aMax[1];
+		childLocalAabbs[i].m_max[2] = aMax[2];
+		childLocalAabbs[i].m_max[3] = 0;
 	}
 	
-	aabbWS.m_min[0] = myAabbMin[0];//s_convexHeightField->m_aabb.m_min.x;
-	aabbWS.m_min[1]= myAabbMin[1];//s_convexHeightField->m_aabb.m_min.y;
-	aabbWS.m_min[2]= myAabbMin[2];//s_convexHeightField->m_aabb.m_min.z;
-	aabbWS.m_minIndices[3] = 0;
+	aabbLocalSpace.m_min[0] = myAabbMin[0];//s_convexHeightField->m_aabb.m_min.x;
+	aabbLocalSpace.m_min[1]= myAabbMin[1];//s_convexHeightField->m_aabb.m_min.y;
+	aabbLocalSpace.m_min[2]= myAabbMin[2];//s_convexHeightField->m_aabb.m_min.z;
+	aabbLocalSpace.m_minIndices[3] = 0;
 	
-	aabbWS.m_max[0] = myAabbMax[0];//s_convexHeightField->m_aabb.m_max.x;
-	aabbWS.m_max[1]= myAabbMax[1];//s_convexHeightField->m_aabb.m_max.y;
-	aabbWS.m_max[2]= myAabbMax[2];//s_convexHeightField->m_aabb.m_max.z;
-	aabbWS.m_signedMaxIndices[3] = 0;
+	aabbLocalSpace.m_max[0] = myAabbMax[0];//s_convexHeightField->m_aabb.m_max.x;
+	aabbLocalSpace.m_max[1]= myAabbMax[1];//s_convexHeightField->m_aabb.m_max.y;
+	aabbLocalSpace.m_max[2]= myAabbMax[2];//s_convexHeightField->m_aabb.m_max.z;
+	aabbLocalSpace.m_signedMaxIndices[3] = 0;
 	
-	m_data->m_localShapeAABBCPU->push_back(aabbWS);
+	m_data->m_localShapeAABBCPU->push_back(aabbLocalSpace);
+
+
+	b3QuantizedBvh* bvh = new b3QuantizedBvh;
+	bvh->setQuantizationValues(myAabbMin,myAabbMax);
+	QuantizedNodeArray&	nodes = bvh->getLeafNodeArray();
+	int numNodes = childShapes->size();
+
+	for (int i=0;i<numNodes;i++)
+	{
+		b3QuantizedBvhNode node;
+		b3Vector3 aabbMin,aabbMax;
+		aabbMin = (b3Vector3&) childLocalAabbs[i].m_min;
+		aabbMax = (b3Vector3&) childLocalAabbs[i].m_max;
+
+		bvh->quantize(&node.m_quantizedAabbMin[0],aabbMin,0);
+		bvh->quantize(&node.m_quantizedAabbMax[0],aabbMax,1);
+		int partId = 0;
+		node.m_escapeIndexOrTriangleIndex = (partId<<(31-MAX_NUM_PARTS_IN_BITS)) | i;
+		nodes.push_back(node);
+	}
+	bvh->buildInternal();
+
+	int numSubTrees = bvh->getSubtreeInfoArray().size();
+
+	//void	setQuantizationValues(const b3Vector3& bvhAabbMin,const b3Vector3& bvhAabbMax,b3Scalar quantizationMargin=b3Scalar(1.0));
+	//QuantizedNodeArray&	getLeafNodeArray() {			return	m_quantizedLeafNodes;	}
+	///buildInternal is expert use only: assumes that setQuantizationValues and LeafNodeArray are initialized
+	//void	buildInternal();
+
+	b3BvhInfo bvhInfo;
+	
+	bvhInfo.m_aabbMin = bvh->m_bvhAabbMin;
+	bvhInfo.m_aabbMax = bvh->m_bvhAabbMax;
+	bvhInfo.m_quantization = bvh->m_bvhQuantization;
+	bvhInfo.m_numNodes = numNodes;
+	bvhInfo.m_numSubTrees = numSubTrees;
+	bvhInfo.m_nodeOffset = m_data->m_treeNodesCPU.size();
+	bvhInfo.m_subTreeOffset = m_data->m_subTreesCPU.size();
+
+	int numNewNodes = 		bvh->getQuantizedNodeArray().size();
+
+	for (int i=0;i<numNewNodes-1;i++)
+	{
+
+		if (bvh->getQuantizedNodeArray()[i].isLeafNode())
+		{
+			int orgIndex = bvh->getQuantizedNodeArray()[i].getTriangleIndex();
+
+			b3Vector3 nodeMinVec = bvh->unQuantize(bvh->getQuantizedNodeArray()[i].m_quantizedAabbMin);
+			b3Vector3 nodeMaxVec = bvh->unQuantize(bvh->getQuantizedNodeArray()[i].m_quantizedAabbMax);
+		
+			for (int c=0;c<3;c++)
+			{
+				if (childLocalAabbs[orgIndex].m_min[c] < nodeMinVec[c])
+				{
+					printf("min org (%f) and new (%f) ? at i:%d,c:%d\n",childLocalAabbs[i].m_min[c],nodeMinVec[c],i,c);
+				}
+				if (childLocalAabbs[orgIndex].m_max[c] > nodeMaxVec[c])
+				{
+					printf("max org (%f) and new (%f) ? at i:%d,c:%d\n",childLocalAabbs[i].m_max[c],nodeMaxVec[c],i,c);
+				}
+
+			}
+		}
+
+	}
+
+	m_data->m_bvhInfoCPU.push_back(bvhInfo);
+
+	int numNewSubtrees = bvh->getSubtreeInfoArray().size();
+	m_data->m_subTreesCPU.reserve(m_data->m_subTreesCPU.size()+numNewSubtrees);
+	for (int i=0;i<numNewSubtrees;i++)
+	{
+		m_data->m_subTreesCPU.push_back(bvh->getSubtreeInfoArray()[i]);
+	}
+	int numNewTreeNodes = bvh->getQuantizedNodeArray().size();
+
+	for (int i=0;i<numNewTreeNodes;i++)
+	{
+		m_data->m_treeNodesCPU.push_back(bvh->getQuantizedNodeArray()[i]);
+	}
+
 //	m_data->m_localShapeAABBGPU->push_back(aabbWS);
 	clFinish(m_queue);
 	return collidableIndex;
diff --git a/src/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipeline.cpp b/src/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipeline.cpp
index cf64ca43a..814493410 100644
--- a/src/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipeline.cpp
+++ b/src/Bullet3OpenCL/RigidBody/b3GpuRigidBodyPipeline.cpp
@@ -33,7 +33,7 @@ subject to the following restrictions:
 #define B3_RIGIDBODY_INTEGRATE_PATH "src/Bullet3OpenCL/RigidBody/kernels/integrateKernel.cl"
 #define B3_RIGIDBODY_UPDATEAABB_PATH "src/Bullet3OpenCL/RigidBody/kernels/updateAabbsKernel.cl"
 
-bool useDbvt = false;//true;
+bool useDbvt = true;//false;//true;
 bool useBullet2CpuSolver = true;
 bool dumpContactStats = false;