source: code/branches/physics/src/bullet/BulletCollision/BroadphaseCollision/btQuantizedBvh.cpp @ 1993

/*
Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/

#include "btQuantizedBvh.h"

#include "LinearMath/btAabbUtil2.h"
#include "LinearMath/btIDebugDraw.h"


btQuantizedBvh::btQuantizedBvh() : m_useQuantization(false), 
                                        //m_traversalMode(TRAVERSAL_STACKLESS_CACHE_FRIENDLY)
                                        m_traversalMode(TRAVERSAL_STACKLESS)
                                        //m_traversalMode(TRAVERSAL_RECURSIVE)
                                        ,m_subtreeHeaderCount(0) //PCK: add this line
{ 

}





void btQuantizedBvh::buildInternal()
{
        ///assumes that caller filled in the m_quantizedLeafNodes
        m_useQuantization = true;
        int numLeafNodes = 0;
        
        if (m_useQuantization)
        {
                //now we have an array of leafnodes in m_leafNodes
                numLeafNodes = m_quantizedLeafNodes.size();

                m_quantizedContiguousNodes.resize(2*numLeafNodes);

        }

        m_curNodeIndex = 0;

        buildTree(0,numLeafNodes);

        ///if the entire tree is small then subtree size, we need to create a header info for the tree
        if(m_useQuantization && !m_SubtreeHeaders.size())
        {
                btBvhSubtreeInfo& subtree = m_SubtreeHeaders.expand();
                subtree.setAabbFromQuantizeNode(m_quantizedContiguousNodes[0]);
                subtree.m_rootNodeIndex = 0;
                subtree.m_subtreeSize = m_quantizedContiguousNodes[0].isLeafNode() ? 1 : m_quantizedContiguousNodes[0].getEscapeIndex();
        }

        //PCK: update the copy of the size
        m_subtreeHeaderCount = m_SubtreeHeaders.size();

        //PCK: clear m_quantizedLeafNodes and m_leafNodes, they are temporary
        m_quantizedLeafNodes.clear();
        m_leafNodes.clear();
}



///just for debugging, to visualize the individual patches/subtrees
#ifdef DEBUG_PATCH_COLORS
btVector3 color[4]=
{
        btVector3(255,0,0),
        btVector3(0,255,0),
        btVector3(0,0,255),
        btVector3(0,255,255)
};
#endif //DEBUG_PATCH_COLORS



void    btQuantizedBvh::setQuantizationValues(const btVector3& bvhAabbMin,const btVector3& bvhAabbMax,btScalar quantizationMargin)
{
        //enlarge the AABB to avoid division by zero when initializing the quantization values
        btVector3 clampValue(quantizationMargin,quantizationMargin,quantizationMargin);
        m_bvhAabbMin = bvhAabbMin - clampValue;
        m_bvhAabbMax = bvhAabbMax + clampValue;
        btVector3 aabbSize = m_bvhAabbMax - m_bvhAabbMin;
        m_bvhQuantization = btVector3(btScalar(65533.0),btScalar(65533.0),btScalar(65533.0)) / aabbSize;
        m_useQuantization = true;
}




btQuantizedBvh::~btQuantizedBvh()
{
}

#ifdef DEBUG_TREE_BUILDING
int gStackDepth = 0;
int gMaxStackDepth = 0;
#endif //DEBUG_TREE_BUILDING

void    btQuantizedBvh::buildTree       (int startIndex,int endIndex)
{
#ifdef DEBUG_TREE_BUILDING
        gStackDepth++;
        if (gStackDepth > gMaxStackDepth)
                gMaxStackDepth = gStackDepth;
#endif //DEBUG_TREE_BUILDING


        int splitAxis, splitIndex, i;
        int numIndices =endIndex-startIndex;
        int curIndex = m_curNodeIndex;

        assert(numIndices>0);

        if (numIndices==1)
        {
#ifdef DEBUG_TREE_BUILDING
                gStackDepth--;
#endif //DEBUG_TREE_BUILDING
                
                assignInternalNodeFromLeafNode(m_curNodeIndex,startIndex);

                m_curNodeIndex++;
                return; 
        }
        //calculate Best Splitting Axis and where to split it. Sort the incoming 'leafNodes' array within range 'startIndex/endIndex'.
        
        splitAxis = calcSplittingAxis(startIndex,endIndex);

        splitIndex = sortAndCalcSplittingIndex(startIndex,endIndex,splitAxis);

        int internalNodeIndex = m_curNodeIndex;
        
        setInternalNodeAabbMax(m_curNodeIndex,m_bvhAabbMin);
        setInternalNodeAabbMin(m_curNodeIndex,m_bvhAabbMax);
        
        for (i=startIndex;i<endIndex;i++)
        {
                mergeInternalNodeAabb(m_curNodeIndex,getAabbMin(i),getAabbMax(i));
        }

        m_curNodeIndex++;
        

        //internalNode->m_escapeIndex;
        
        int leftChildNodexIndex = m_curNodeIndex;

        //build left child tree
        buildTree(startIndex,splitIndex);

        int rightChildNodexIndex = m_curNodeIndex;
        //build right child tree
        buildTree(splitIndex,endIndex);

#ifdef DEBUG_TREE_BUILDING
        gStackDepth--;
#endif //DEBUG_TREE_BUILDING

        int escapeIndex = m_curNodeIndex - curIndex;

        if (m_useQuantization)
        {
                //escapeIndex is the number of nodes of this subtree
                const int sizeQuantizedNode =sizeof(btQuantizedBvhNode);
                const int treeSizeInBytes = escapeIndex * sizeQuantizedNode;
                if (treeSizeInBytes > MAX_SUBTREE_SIZE_IN_BYTES)
                {
                        updateSubtreeHeaders(leftChildNodexIndex,rightChildNodexIndex);
                }
        }

        setInternalNodeEscapeIndex(internalNodeIndex,escapeIndex);

}

void    btQuantizedBvh::updateSubtreeHeaders(int leftChildNodexIndex,int rightChildNodexIndex)
{
        btAssert(m_useQuantization);

        btQuantizedBvhNode& leftChildNode = m_quantizedContiguousNodes[leftChildNodexIndex];
        int leftSubTreeSize = leftChildNode.isLeafNode() ? 1 : leftChildNode.getEscapeIndex();
        int leftSubTreeSizeInBytes =  leftSubTreeSize * static_cast<int>(sizeof(btQuantizedBvhNode));
        
        btQuantizedBvhNode& rightChildNode = m_quantizedContiguousNodes[rightChildNodexIndex];
        int rightSubTreeSize = rightChildNode.isLeafNode() ? 1 : rightChildNode.getEscapeIndex();
        int rightSubTreeSizeInBytes =  rightSubTreeSize *  static_cast<int>(sizeof(btQuantizedBvhNode));

        if(leftSubTreeSizeInBytes <= MAX_SUBTREE_SIZE_IN_BYTES)
        {
                btBvhSubtreeInfo& subtree = m_SubtreeHeaders.expand();
                subtree.setAabbFromQuantizeNode(leftChildNode);
                subtree.m_rootNodeIndex = leftChildNodexIndex;
                subtree.m_subtreeSize = leftSubTreeSize;
        }

        if(rightSubTreeSizeInBytes <= MAX_SUBTREE_SIZE_IN_BYTES)
        {
                btBvhSubtreeInfo& subtree = m_SubtreeHeaders.expand();
                subtree.setAabbFromQuantizeNode(rightChildNode);
                subtree.m_rootNodeIndex = rightChildNodexIndex;
                subtree.m_subtreeSize = rightSubTreeSize;
        }

        //PCK: update the copy of the size
        m_subtreeHeaderCount = m_SubtreeHeaders.size();
}


int     btQuantizedBvh::sortAndCalcSplittingIndex(int startIndex,int endIndex,int splitAxis)
{
        int i;
        int splitIndex =startIndex;
        int numIndices = endIndex - startIndex;
        btScalar splitValue;

        btVector3 means(btScalar(0.),btScalar(0.),btScalar(0.));
        for (i=startIndex;i<endIndex;i++)
        {
                btVector3 center = btScalar(0.5)*(getAabbMax(i)+getAabbMin(i));
                means+=center;
        }
        means *= (btScalar(1.)/(btScalar)numIndices);
        
        splitValue = means[splitAxis];
        
        //sort leafNodes so all values larger then splitValue comes first, and smaller values start from 'splitIndex'.
        for (i=startIndex;i<endIndex;i++)
        {
                btVector3 center = btScalar(0.5)*(getAabbMax(i)+getAabbMin(i));
                if (center[splitAxis] > splitValue)
                {
                        //swap
                        swapLeafNodes(i,splitIndex);
                        splitIndex++;
                }
        }

        //if the splitIndex causes unbalanced trees, fix this by using the center in between startIndex and endIndex
        //otherwise the tree-building might fail due to stack-overflows in certain cases.
        //unbalanced1 is unsafe: it can cause stack overflows
        //bool unbalanced1 = ((splitIndex==startIndex) || (splitIndex == (endIndex-1)));

        //unbalanced2 should work too: always use center (perfect balanced trees)       
        //bool unbalanced2 = true;

        //this should be safe too:
        int rangeBalancedIndices = numIndices/3;
        bool unbalanced = ((splitIndex<=(startIndex+rangeBalancedIndices)) || (splitIndex >=(endIndex-1-rangeBalancedIndices)));
        
        if (unbalanced)
        {
                splitIndex = startIndex+ (numIndices>>1);
        }

        bool unbal = (splitIndex==startIndex) || (splitIndex == (endIndex));
        (void)unbal;
        btAssert(!unbal);

        return splitIndex;
}


int     btQuantizedBvh::calcSplittingAxis(int startIndex,int endIndex)
{
        int i;

        btVector3 means(btScalar(0.),btScalar(0.),btScalar(0.));
        btVector3 variance(btScalar(0.),btScalar(0.),btScalar(0.));
        int numIndices = endIndex-startIndex;

        for (i=startIndex;i<endIndex;i++)
        {
                btVector3 center = btScalar(0.5)*(getAabbMax(i)+getAabbMin(i));
                means+=center;
        }
        means *= (btScalar(1.)/(btScalar)numIndices);
                
        for (i=startIndex;i<endIndex;i++)
        {
                btVector3 center = btScalar(0.5)*(getAabbMax(i)+getAabbMin(i));
                btVector3 diff2 = center-means;
                diff2 = diff2 * diff2;
                variance += diff2;
        }
        variance *= (btScalar(1.)/      ((btScalar)numIndices-1)        );
        
        return variance.maxAxis();
}



void    btQuantizedBvh::reportAabbOverlappingNodex(btNodeOverlapCallback* nodeCallback,const btVector3& aabbMin,const btVector3& aabbMax) const
{
        //either choose recursive traversal (walkTree) or stackless (walkStacklessTree)

        if (m_useQuantization)
        {
                ///quantize query AABB
                unsigned short int quantizedQueryAabbMin[3];
                unsigned short int quantizedQueryAabbMax[3];
                quantizeWithClamp(quantizedQueryAabbMin,aabbMin,0);
                quantizeWithClamp(quantizedQueryAabbMax,aabbMax,1);

                switch (m_traversalMode)
                {
                case TRAVERSAL_STACKLESS:
                                walkStacklessQuantizedTree(nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax,0,m_curNodeIndex);
                        break;
                case TRAVERSAL_STACKLESS_CACHE_FRIENDLY:
                                walkStacklessQuantizedTreeCacheFriendly(nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax);
                        break;
                case TRAVERSAL_RECURSIVE:
                        {
                                const btQuantizedBvhNode* rootNode = &m_quantizedContiguousNodes[0];
                                walkRecursiveQuantizedTreeAgainstQueryAabb(rootNode,nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax);
                        }
                        break;
                default:
                        //unsupported
                        btAssert(0);
                }
        } else
        {
                walkStacklessTree(nodeCallback,aabbMin,aabbMax);
        }
}


int maxIterations = 0;

void    btQuantizedBvh::walkStacklessTree(btNodeOverlapCallback* nodeCallback,const btVector3& aabbMin,const btVector3& aabbMax) const
{
        btAssert(!m_useQuantization);

        const btOptimizedBvhNode* rootNode = &m_contiguousNodes[0];
        int escapeIndex, curIndex = 0;
        int walkIterations = 0;
        bool isLeafNode;
        //PCK: unsigned instead of bool
        unsigned aabbOverlap;

        while (curIndex < m_curNodeIndex)
        {
                //catch bugs in tree data
                assert (walkIterations < m_curNodeIndex);

                walkIterations++;
                aabbOverlap = TestAabbAgainstAabb2(aabbMin,aabbMax,rootNode->m_aabbMinOrg,rootNode->m_aabbMaxOrg);
                isLeafNode = rootNode->m_escapeIndex == -1;
                
                //PCK: unsigned instead of bool
                if (isLeafNode && (aabbOverlap != 0))
                {
                        nodeCallback->processNode(rootNode->m_subPart,rootNode->m_triangleIndex);
                } 
                
                //PCK: unsigned instead of bool
                if ((aabbOverlap != 0) || isLeafNode)
                {
                        rootNode++;
                        curIndex++;
                } else
                {
                        escapeIndex = rootNode->m_escapeIndex;
                        rootNode += escapeIndex;
                        curIndex += escapeIndex;
                }
        }
        if (maxIterations < walkIterations)
                maxIterations = walkIterations;

}

/*
///this was the original recursive traversal, before we optimized towards stackless traversal
void    btQuantizedBvh::walkTree(btOptimizedBvhNode* rootNode,btNodeOverlapCallback* nodeCallback,const btVector3& aabbMin,const btVector3& aabbMax) const
{
        bool isLeafNode, aabbOverlap = TestAabbAgainstAabb2(aabbMin,aabbMax,rootNode->m_aabbMin,rootNode->m_aabbMax);
        if (aabbOverlap)
        {
                isLeafNode = (!rootNode->m_leftChild && !rootNode->m_rightChild);
                if (isLeafNode)
                {
                        nodeCallback->processNode(rootNode);
                } else
                {
                        walkTree(rootNode->m_leftChild,nodeCallback,aabbMin,aabbMax);
                        walkTree(rootNode->m_rightChild,nodeCallback,aabbMin,aabbMax);
                }
        }

}
*/

void btQuantizedBvh::walkRecursiveQuantizedTreeAgainstQueryAabb(const btQuantizedBvhNode* currentNode,btNodeOverlapCallback* nodeCallback,unsigned short int* quantizedQueryAabbMin,unsigned short int* quantizedQueryAabbMax) const
{
        btAssert(m_useQuantization);
        
        bool isLeafNode;
        //PCK: unsigned instead of bool
        unsigned aabbOverlap;

        //PCK: unsigned instead of bool
        aabbOverlap = testQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,currentNode->m_quantizedAabbMin,currentNode->m_quantizedAabbMax);
        isLeafNode = currentNode->isLeafNode();
                
        //PCK: unsigned instead of bool
        if (aabbOverlap != 0)
        {
                if (isLeafNode)
                {
                        nodeCallback->processNode(currentNode->getPartId(),currentNode->getTriangleIndex());
                } else
                {
                        //process left and right children
                        const btQuantizedBvhNode* leftChildNode = currentNode+1;
                        walkRecursiveQuantizedTreeAgainstQueryAabb(leftChildNode,nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax);

                        const btQuantizedBvhNode* rightChildNode = leftChildNode->isLeafNode() ? leftChildNode+1:leftChildNode+leftChildNode->getEscapeIndex();
                        walkRecursiveQuantizedTreeAgainstQueryAabb(rightChildNode,nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax);
                }
        }               
}





void    btQuantizedBvh::walkStacklessQuantizedTreeAgainstRay(btNodeOverlapCallback* nodeCallback, const btVector3& raySource, const btVector3& rayTarget, const btVector3& aabbMin, const btVector3& aabbMax, int startNodeIndex,int endNodeIndex) const
{
        btAssert(m_useQuantization);
        
        int curIndex = startNodeIndex;
        int walkIterations = 0;
        int subTreeSize = endNodeIndex - startNodeIndex;
        (void)subTreeSize;

        const btQuantizedBvhNode* rootNode = &m_quantizedContiguousNodes[startNodeIndex];
        int escapeIndex;
        
        bool isLeafNode;
        //PCK: unsigned instead of bool
        unsigned boxBoxOverlap = 0;
        unsigned rayBoxOverlap = 0;

        btScalar lambda_max = 1.0;
#define RAYAABB2
#ifdef RAYAABB2
        btVector3 rayFrom = raySource;
        btVector3 rayDirection = (rayTarget-raySource);
        rayDirection.normalize ();
        lambda_max = rayDirection.dot(rayTarget-raySource);
        ///what about division by zero? --> just set rayDirection[i] to 1.0
        rayDirection[0] = rayDirection[0] == btScalar(0.0) ? btScalar(1e30) : btScalar(1.0) / rayDirection[0];
        rayDirection[1] = rayDirection[1] == btScalar(0.0) ? btScalar(1e30) : btScalar(1.0) / rayDirection[1];
        rayDirection[2] = rayDirection[2] == btScalar(0.0) ? btScalar(1e30) : btScalar(1.0) / rayDirection[2];
        unsigned int sign[3] = { rayDirection[0] < 0.0, rayDirection[1] < 0.0, rayDirection[2] < 0.0};
#endif

        /* Quick pruning by quantized box */
        btVector3 rayAabbMin = raySource;
        btVector3 rayAabbMax = raySource;
        rayAabbMin.setMin(rayTarget);
        rayAabbMax.setMax(rayTarget);

        /* Add box cast extents to bounding box */
        rayAabbMin += aabbMin;
        rayAabbMax += aabbMax;

        unsigned short int quantizedQueryAabbMin[3];
        unsigned short int quantizedQueryAabbMax[3];
        quantizeWithClamp(quantizedQueryAabbMin,rayAabbMin,0);
        quantizeWithClamp(quantizedQueryAabbMax,rayAabbMax,1);

        while (curIndex < endNodeIndex)
        {

//#define VISUALLY_ANALYZE_BVH 1
#ifdef VISUALLY_ANALYZE_BVH
                //some code snippet to debugDraw aabb, to visually analyze bvh structure
                static int drawPatch = 0;
                //need some global access to a debugDrawer
                extern btIDebugDraw* debugDrawerPtr;
                if (curIndex==drawPatch)
                {
                        btVector3 aabbMin,aabbMax;
                        aabbMin = unQuantize(rootNode->m_quantizedAabbMin);
                        aabbMax = unQuantize(rootNode->m_quantizedAabbMax);
                        btVector3       color(1,0,0);
                        debugDrawerPtr->drawAabb(aabbMin,aabbMax,color);
                }
#endif//VISUALLY_ANALYZE_BVH

                //catch bugs in tree data
                assert (walkIterations < subTreeSize);

                walkIterations++;
                //PCK: unsigned instead of bool
                // only interested if this is closer than any previous hit
                btScalar param = 1.0;
                rayBoxOverlap = 0;
                boxBoxOverlap = testQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,rootNode->m_quantizedAabbMin,rootNode->m_quantizedAabbMax);
                isLeafNode = rootNode->isLeafNode();
                if (boxBoxOverlap)
                {
                        btVector3 bounds[2];
                        bounds[0] = unQuantize(rootNode->m_quantizedAabbMin);
                        bounds[1] = unQuantize(rootNode->m_quantizedAabbMax);
                        /* Add box cast extents */
                        bounds[0] += aabbMin;
                        bounds[1] += aabbMax;
                        btVector3 normal;
#if 0
                        bool ra2 = btRayAabb2 (raySource, rayDirection, sign, bounds, param, 0.0, lambda_max);
                        bool ra = btRayAabb (raySource, rayTarget, bounds[0], bounds[1], param, normal);
                        if (ra2 != ra)
                        {
                                printf("functions don't match\n");
                        }
#endif
#ifdef RAYAABB2
                        ///careful with this check: need to check division by zero (above) and fix the unQuantize method
                        ///thanks Joerg/hiker for the reproduction case!
                        ///http://www.bulletphysics.com/Bullet/phpBB3/viewtopic.php?f=9&t=1858

                        rayBoxOverlap = btRayAabb2 (raySource, rayDirection, sign, bounds, param, 0.0f, lambda_max);
#else
                        rayBoxOverlap = true;//btRayAabb(raySource, rayTarget, bounds[0], bounds[1], param, normal);
#endif
                }
                
                if (isLeafNode && rayBoxOverlap)
                {
                        nodeCallback->processNode(rootNode->getPartId(),rootNode->getTriangleIndex());
                }
                
                //PCK: unsigned instead of bool
                if ((rayBoxOverlap != 0) || isLeafNode)
                {
                        rootNode++;
                        curIndex++;
                } else
                {
                        escapeIndex = rootNode->getEscapeIndex();
                        rootNode += escapeIndex;
                        curIndex += escapeIndex;
                }
        }
        if (maxIterations < walkIterations)
                maxIterations = walkIterations;

}

void    btQuantizedBvh::walkStacklessQuantizedTree(btNodeOverlapCallback* nodeCallback,unsigned short int* quantizedQueryAabbMin,unsigned short int* quantizedQueryAabbMax,int startNodeIndex,int endNodeIndex) const
{
        btAssert(m_useQuantization);
        
        int curIndex = startNodeIndex;
        int walkIterations = 0;
        int subTreeSize = endNodeIndex - startNodeIndex;
        (void)subTreeSize;

        const btQuantizedBvhNode* rootNode = &m_quantizedContiguousNodes[startNodeIndex];
        int escapeIndex;
        
        bool isLeafNode;
        //PCK: unsigned instead of bool
        unsigned aabbOverlap;

        while (curIndex < endNodeIndex)
        {

//#define VISUALLY_ANALYZE_BVH 1
#ifdef VISUALLY_ANALYZE_BVH
                //some code snippet to debugDraw aabb, to visually analyze bvh structure
                static int drawPatch = 0;
                //need some global access to a debugDrawer
                extern btIDebugDraw* debugDrawerPtr;
                if (curIndex==drawPatch)
                {
                        btVector3 aabbMin,aabbMax;
                        aabbMin = unQuantize(rootNode->m_quantizedAabbMin);
                        aabbMax = unQuantize(rootNode->m_quantizedAabbMax);
                        btVector3       color(1,0,0);
                        debugDrawerPtr->drawAabb(aabbMin,aabbMax,color);
                }
#endif//VISUALLY_ANALYZE_BVH

                //catch bugs in tree data
                assert (walkIterations < subTreeSize);

                walkIterations++;
                //PCK: unsigned instead of bool
                aabbOverlap = testQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,rootNode->m_quantizedAabbMin,rootNode->m_quantizedAabbMax);
                isLeafNode = rootNode->isLeafNode();
                
                if (isLeafNode && aabbOverlap)
                {
                        nodeCallback->processNode(rootNode->getPartId(),rootNode->getTriangleIndex());
                } 
                
                //PCK: unsigned instead of bool
                if ((aabbOverlap != 0) || isLeafNode)
                {
                        rootNode++;
                        curIndex++;
                } else
                {
                        escapeIndex = rootNode->getEscapeIndex();
                        rootNode += escapeIndex;
                        curIndex += escapeIndex;
                }
        }
        if (maxIterations < walkIterations)
                maxIterations = walkIterations;

}

//This traversal can be called from Playstation 3 SPU
void    btQuantizedBvh::walkStacklessQuantizedTreeCacheFriendly(btNodeOverlapCallback* nodeCallback,unsigned short int* quantizedQueryAabbMin,unsigned short int* quantizedQueryAabbMax) const
{
        btAssert(m_useQuantization);

        int i;


        for (i=0;i<this->m_SubtreeHeaders.size();i++)
        {
                const btBvhSubtreeInfo& subtree = m_SubtreeHeaders[i];

                //PCK: unsigned instead of bool
                unsigned overlap = testQuantizedAabbAgainstQuantizedAabb(quantizedQueryAabbMin,quantizedQueryAabbMax,subtree.m_quantizedAabbMin,subtree.m_quantizedAabbMax);
                if (overlap != 0)
                {
                        walkStacklessQuantizedTree(nodeCallback,quantizedQueryAabbMin,quantizedQueryAabbMax,
                                subtree.m_rootNodeIndex,
                                subtree.m_rootNodeIndex+subtree.m_subtreeSize);
                }
        }
}


void    btQuantizedBvh::reportRayOverlappingNodex (btNodeOverlapCallback* nodeCallback, const btVector3& raySource, const btVector3& rayTarget) const
{
        bool fast_path = m_useQuantization && m_traversalMode == TRAVERSAL_STACKLESS;
        if (fast_path)
        {
                walkStacklessQuantizedTreeAgainstRay(nodeCallback, raySource, rayTarget, btVector3(0, 0, 0), btVector3(0, 0, 0), 0, m_curNodeIndex);
        } else {
                /* Otherwise fallback to AABB overlap test */
                btVector3 aabbMin = raySource;
                btVector3 aabbMax = raySource;
                aabbMin.setMin(rayTarget);
                aabbMax.setMax(rayTarget);
                reportAabbOverlappingNodex(nodeCallback,aabbMin,aabbMax);
        }
}


void    btQuantizedBvh::reportBoxCastOverlappingNodex(btNodeOverlapCallback* nodeCallback, const btVector3& raySource, const btVector3& rayTarget, const btVector3& aabbMin,const btVector3& aabbMax) const
{
        bool fast_path = m_useQuantization && m_traversalMode == TRAVERSAL_STACKLESS;
        if (fast_path)
        {
                walkStacklessQuantizedTreeAgainstRay(nodeCallback, raySource, rayTarget, aabbMin, aabbMax, 0, m_curNodeIndex);
        } else {
                /* Slow path:
                   Construct the bounding box for the entire box cast and send that down the tree */
                btVector3 qaabbMin = raySource;
                btVector3 qaabbMax = raySource;
                qaabbMin.setMin(rayTarget);
                qaabbMax.setMax(rayTarget);
                qaabbMin += aabbMin;
                qaabbMax += aabbMax;
                reportAabbOverlappingNodex(nodeCallback,qaabbMin,qaabbMax);
        }
}


void    btQuantizedBvh::swapLeafNodes(int i,int splitIndex)
{
        if (m_useQuantization)
        {
                        btQuantizedBvhNode tmp = m_quantizedLeafNodes[i];
                        m_quantizedLeafNodes[i] = m_quantizedLeafNodes[splitIndex];
                        m_quantizedLeafNodes[splitIndex] = tmp;
        } else
        {
                        btOptimizedBvhNode tmp = m_leafNodes[i];
                        m_leafNodes[i] = m_leafNodes[splitIndex];
                        m_leafNodes[splitIndex] = tmp;
        }
}

void    btQuantizedBvh::assignInternalNodeFromLeafNode(int internalNode,int leafNodeIndex)
{
        if (m_useQuantization)
        {
                m_quantizedContiguousNodes[internalNode] = m_quantizedLeafNodes[leafNodeIndex];
        } else
        {
                m_contiguousNodes[internalNode] = m_leafNodes[leafNodeIndex];
        }
}

//PCK: include
#include <new>

//PCK: consts
static const unsigned BVH_ALIGNMENT = 16;
static const unsigned BVH_ALIGNMENT_MASK = BVH_ALIGNMENT-1;

static const unsigned BVH_ALIGNMENT_BLOCKS = 2;



unsigned int btQuantizedBvh::getAlignmentSerializationPadding()
{
        // I changed this to 0 since the extra padding is not needed or used.
        return 0;//BVH_ALIGNMENT_BLOCKS * BVH_ALIGNMENT;
}

unsigned btQuantizedBvh::calculateSerializeBufferSize()
{
        unsigned baseSize = sizeof(btQuantizedBvh) + getAlignmentSerializationPadding();
        baseSize += sizeof(btBvhSubtreeInfo) * m_subtreeHeaderCount;
        if (m_useQuantization)
        {
                return baseSize + m_curNodeIndex * sizeof(btQuantizedBvhNode);
        }
        return baseSize + m_curNodeIndex * sizeof(btOptimizedBvhNode);
}

bool btQuantizedBvh::serialize(void *o_alignedDataBuffer, unsigned /*i_dataBufferSize */, bool i_swapEndian)
{
        assert(m_subtreeHeaderCount == m_SubtreeHeaders.size());
        m_subtreeHeaderCount = m_SubtreeHeaders.size();

/*      if (i_dataBufferSize < calculateSerializeBufferSize() || o_alignedDataBuffer == NULL || (((unsigned)o_alignedDataBuffer & BVH_ALIGNMENT_MASK) != 0))
        {
                ///check alignedment for buffer?
                btAssert(0);
                return false;
        }
*/

        btQuantizedBvh *targetBvh = (btQuantizedBvh *)o_alignedDataBuffer;

        // construct the class so the virtual function table, etc will be set up
        // Also, m_leafNodes and m_quantizedLeafNodes will be initialized to default values by the constructor
        new (targetBvh) btQuantizedBvh;

        if (i_swapEndian)
        {
                targetBvh->m_curNodeIndex = static_cast<int>(btSwapEndian(m_curNodeIndex));


                btSwapVector3Endian(m_bvhAabbMin,targetBvh->m_bvhAabbMin);
                btSwapVector3Endian(m_bvhAabbMax,targetBvh->m_bvhAabbMax);
                btSwapVector3Endian(m_bvhQuantization,targetBvh->m_bvhQuantization);

                targetBvh->m_traversalMode = (btTraversalMode)btSwapEndian(m_traversalMode);
                targetBvh->m_subtreeHeaderCount = static_cast<int>(btSwapEndian(m_subtreeHeaderCount));
        }
        else
        {
                targetBvh->m_curNodeIndex = m_curNodeIndex;
                targetBvh->m_bvhAabbMin = m_bvhAabbMin;
                targetBvh->m_bvhAabbMax = m_bvhAabbMax;
                targetBvh->m_bvhQuantization = m_bvhQuantization;
                targetBvh->m_traversalMode = m_traversalMode;
                targetBvh->m_subtreeHeaderCount = m_subtreeHeaderCount;
        }

        targetBvh->m_useQuantization = m_useQuantization;

        unsigned char *nodeData = (unsigned char *)targetBvh;
        nodeData += sizeof(btQuantizedBvh);
        
        unsigned sizeToAdd = 0;//(BVH_ALIGNMENT-((unsigned)nodeData & BVH_ALIGNMENT_MASK))&BVH_ALIGNMENT_MASK;
        nodeData += sizeToAdd;
        
        int nodeCount = m_curNodeIndex;

        if (m_useQuantization)
        {
                targetBvh->m_quantizedContiguousNodes.initializeFromBuffer(nodeData, nodeCount, nodeCount);

                if (i_swapEndian)
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0]);
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1]);
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2]);

                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0]);
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1]);
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2] = btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2]);

                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex = static_cast<int>(btSwapEndian(m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex));
                        }
                }
                else
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
        
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0];
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1];
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2];

                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0];
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1];
                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2] = m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2];

                                targetBvh->m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex = m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex;


                        }
                }
                nodeData += sizeof(btQuantizedBvhNode) * nodeCount;

                // this clears the pointer in the member variable it doesn't really do anything to the data
                // it does call the destructor on the contained objects, but they are all classes with no destructor defined
                // so the memory (which is not freed) is left alone
                targetBvh->m_quantizedContiguousNodes.initializeFromBuffer(NULL, 0, 0);
        }
        else
        {
                targetBvh->m_contiguousNodes.initializeFromBuffer(nodeData, nodeCount, nodeCount);

                if (i_swapEndian)
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
                                btSwapVector3Endian(m_contiguousNodes[nodeIndex].m_aabbMinOrg, targetBvh->m_contiguousNodes[nodeIndex].m_aabbMinOrg);
                                btSwapVector3Endian(m_contiguousNodes[nodeIndex].m_aabbMaxOrg, targetBvh->m_contiguousNodes[nodeIndex].m_aabbMaxOrg);

                                targetBvh->m_contiguousNodes[nodeIndex].m_escapeIndex = static_cast<int>(btSwapEndian(m_contiguousNodes[nodeIndex].m_escapeIndex));
                                targetBvh->m_contiguousNodes[nodeIndex].m_subPart = static_cast<int>(btSwapEndian(m_contiguousNodes[nodeIndex].m_subPart));
                                targetBvh->m_contiguousNodes[nodeIndex].m_triangleIndex = static_cast<int>(btSwapEndian(m_contiguousNodes[nodeIndex].m_triangleIndex));
                        }
                }
                else
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
                                targetBvh->m_contiguousNodes[nodeIndex].m_aabbMinOrg = m_contiguousNodes[nodeIndex].m_aabbMinOrg;
                                targetBvh->m_contiguousNodes[nodeIndex].m_aabbMaxOrg = m_contiguousNodes[nodeIndex].m_aabbMaxOrg;

                                targetBvh->m_contiguousNodes[nodeIndex].m_escapeIndex = m_contiguousNodes[nodeIndex].m_escapeIndex;
                                targetBvh->m_contiguousNodes[nodeIndex].m_subPart = m_contiguousNodes[nodeIndex].m_subPart;
                                targetBvh->m_contiguousNodes[nodeIndex].m_triangleIndex = m_contiguousNodes[nodeIndex].m_triangleIndex;
                        }
                }
                nodeData += sizeof(btOptimizedBvhNode) * nodeCount;

                // this clears the pointer in the member variable it doesn't really do anything to the data
                // it does call the destructor on the contained objects, but they are all classes with no destructor defined
                // so the memory (which is not freed) is left alone
                targetBvh->m_contiguousNodes.initializeFromBuffer(NULL, 0, 0);
        }

        sizeToAdd = 0;//(BVH_ALIGNMENT-((unsigned)nodeData & BVH_ALIGNMENT_MASK))&BVH_ALIGNMENT_MASK;
        nodeData += sizeToAdd;

        // Now serialize the subtree headers
        targetBvh->m_SubtreeHeaders.initializeFromBuffer(nodeData, m_subtreeHeaderCount, m_subtreeHeaderCount);
        if (i_swapEndian)
        {
                for (int i = 0; i < m_subtreeHeaderCount; i++)
                {
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[0] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMin[0]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[1] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMin[1]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[2] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMin[2]);

                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[0] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMax[0]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[1] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMax[1]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[2] = btSwapEndian(m_SubtreeHeaders[i].m_quantizedAabbMax[2]);

                        targetBvh->m_SubtreeHeaders[i].m_rootNodeIndex = static_cast<int>(btSwapEndian(m_SubtreeHeaders[i].m_rootNodeIndex));
                        targetBvh->m_SubtreeHeaders[i].m_subtreeSize = static_cast<int>(btSwapEndian(m_SubtreeHeaders[i].m_subtreeSize));
                }
        }
        else
        {
                for (int i = 0; i < m_subtreeHeaderCount; i++)
                {
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[0] = (m_SubtreeHeaders[i].m_quantizedAabbMin[0]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[1] = (m_SubtreeHeaders[i].m_quantizedAabbMin[1]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMin[2] = (m_SubtreeHeaders[i].m_quantizedAabbMin[2]);

                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[0] = (m_SubtreeHeaders[i].m_quantizedAabbMax[0]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[1] = (m_SubtreeHeaders[i].m_quantizedAabbMax[1]);
                        targetBvh->m_SubtreeHeaders[i].m_quantizedAabbMax[2] = (m_SubtreeHeaders[i].m_quantizedAabbMax[2]);

                        targetBvh->m_SubtreeHeaders[i].m_rootNodeIndex = (m_SubtreeHeaders[i].m_rootNodeIndex);
                        targetBvh->m_SubtreeHeaders[i].m_subtreeSize = (m_SubtreeHeaders[i].m_subtreeSize);

                        // need to clear padding in destination buffer
                        targetBvh->m_SubtreeHeaders[i].m_padding[0] = 0;
                        targetBvh->m_SubtreeHeaders[i].m_padding[1] = 0;
                        targetBvh->m_SubtreeHeaders[i].m_padding[2] = 0;
                }
        }
        nodeData += sizeof(btBvhSubtreeInfo) * m_subtreeHeaderCount;

        // this clears the pointer in the member variable it doesn't really do anything to the data
        // it does call the destructor on the contained objects, but they are all classes with no destructor defined
        // so the memory (which is not freed) is left alone
        targetBvh->m_SubtreeHeaders.initializeFromBuffer(NULL, 0, 0);

        // this wipes the virtual function table pointer at the start of the buffer for the class
        *((void**)o_alignedDataBuffer) = NULL;

        return true;
}

btQuantizedBvh *btQuantizedBvh::deSerializeInPlace(void *i_alignedDataBuffer, unsigned int i_dataBufferSize, bool i_swapEndian)
{

        if (i_alignedDataBuffer == NULL)// || (((unsigned)i_alignedDataBuffer & BVH_ALIGNMENT_MASK) != 0))
        {
                return NULL;
        }
        btQuantizedBvh *bvh = (btQuantizedBvh *)i_alignedDataBuffer;

        if (i_swapEndian)
        {
                bvh->m_curNodeIndex = static_cast<int>(btSwapEndian(bvh->m_curNodeIndex));

                btUnSwapVector3Endian(bvh->m_bvhAabbMin);
                btUnSwapVector3Endian(bvh->m_bvhAabbMax);
                btUnSwapVector3Endian(bvh->m_bvhQuantization);

                bvh->m_traversalMode = (btTraversalMode)btSwapEndian(bvh->m_traversalMode);
                bvh->m_subtreeHeaderCount = static_cast<int>(btSwapEndian(bvh->m_subtreeHeaderCount));
        }

        unsigned int calculatedBufSize = bvh->calculateSerializeBufferSize();
        btAssert(calculatedBufSize <= i_dataBufferSize);

        if (calculatedBufSize > i_dataBufferSize)
        {
                return NULL;
        }

        unsigned char *nodeData = (unsigned char *)bvh;
        nodeData += sizeof(btQuantizedBvh);
        
        unsigned sizeToAdd = 0;//(BVH_ALIGNMENT-((unsigned)nodeData & BVH_ALIGNMENT_MASK))&BVH_ALIGNMENT_MASK;
        nodeData += sizeToAdd;
        
        int nodeCount = bvh->m_curNodeIndex;

        // Must call placement new to fill in virtual function table, etc, but we don't want to overwrite most data, so call a special version of the constructor
        // Also, m_leafNodes and m_quantizedLeafNodes will be initialized to default values by the constructor
        new (bvh) btQuantizedBvh(*bvh, false);

        if (bvh->m_useQuantization)
        {
                bvh->m_quantizedContiguousNodes.initializeFromBuffer(nodeData, nodeCount, nodeCount);

                if (i_swapEndian)
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[0]);
                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[1]);
                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMin[2]);

                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[0]);
                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[1]);
                                bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2] = btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_quantizedAabbMax[2]);

                                bvh->m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex = static_cast<int>(btSwapEndian(bvh->m_quantizedContiguousNodes[nodeIndex].m_escapeIndexOrTriangleIndex));
                        }
                }
                nodeData += sizeof(btQuantizedBvhNode) * nodeCount;
        }
        else
        {
                bvh->m_contiguousNodes.initializeFromBuffer(nodeData, nodeCount, nodeCount);

                if (i_swapEndian)
                {
                        for (int nodeIndex = 0; nodeIndex < nodeCount; nodeIndex++)
                        {
                                btUnSwapVector3Endian(bvh->m_contiguousNodes[nodeIndex].m_aabbMinOrg);
                                btUnSwapVector3Endian(bvh->m_contiguousNodes[nodeIndex].m_aabbMaxOrg);
                                
                                bvh->m_contiguousNodes[nodeIndex].m_escapeIndex = static_cast<int>(btSwapEndian(bvh->m_contiguousNodes[nodeIndex].m_escapeIndex));
                                bvh->m_contiguousNodes[nodeIndex].m_subPart = static_cast<int>(btSwapEndian(bvh->m_contiguousNodes[nodeIndex].m_subPart));
                                bvh->m_contiguousNodes[nodeIndex].m_triangleIndex = static_cast<int>(btSwapEndian(bvh->m_contiguousNodes[nodeIndex].m_triangleIndex));
                        }
                }
                nodeData += sizeof(btOptimizedBvhNode) * nodeCount;
        }

        sizeToAdd = 0;//(BVH_ALIGNMENT-((unsigned)nodeData & BVH_ALIGNMENT_MASK))&BVH_ALIGNMENT_MASK;
        nodeData += sizeToAdd;

        // Now serialize the subtree headers
        bvh->m_SubtreeHeaders.initializeFromBuffer(nodeData, bvh->m_subtreeHeaderCount, bvh->m_subtreeHeaderCount);
        if (i_swapEndian)
        {
                for (int i = 0; i < bvh->m_subtreeHeaderCount; i++)
                {
                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[0] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[0]);
                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[1] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[1]);
                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[2] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMin[2]);

                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[0] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[0]);
                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[1] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[1]);
                        bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[2] = btSwapEndian(bvh->m_SubtreeHeaders[i].m_quantizedAabbMax[2]);

                        bvh->m_SubtreeHeaders[i].m_rootNodeIndex = static_cast<int>(btSwapEndian(bvh->m_SubtreeHeaders[i].m_rootNodeIndex));
                        bvh->m_SubtreeHeaders[i].m_subtreeSize = static_cast<int>(btSwapEndian(bvh->m_SubtreeHeaders[i].m_subtreeSize));
                }
        }

        return bvh;
}

// Constructor that prevents btVector3's default constructor from being called
btQuantizedBvh::btQuantizedBvh(btQuantizedBvh &self, bool /* ownsMemory */) :
m_bvhAabbMin(self.m_bvhAabbMin),
m_bvhAabbMax(self.m_bvhAabbMax),
m_bvhQuantization(self.m_bvhQuantization)
{


}