310 lines
10 KiB
C++
310 lines
10 KiB
C++
/* OpenSceneGraph example, osgintersection.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "variabledivision.h"
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namespace variabledivision
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{
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struct TriangleIndicesCollector
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{
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TriangleIndicesCollector():
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_kdTree(0)
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{
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}
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inline void operator () (unsigned int p1, unsigned int p2, unsigned int p3)
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{
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unsigned int i = _kdTree->_triangles.size();
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_kdTree->_triangles.push_back(Triangle(p1,p2,p3));
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osg::BoundingBox bb;
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bb.expandBy((*(_kdTree->_vertices))[p1]);
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bb.expandBy((*(_kdTree->_vertices))[p2]);
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bb.expandBy((*(_kdTree->_vertices))[p3]);
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_kdTree->_boundingBoxes.push_back(bb);
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_kdTree->_centers.push_back(bb.center());
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_kdTree->_primitiveIndices.push_back(i);
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}
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KDTree* _kdTree;
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};
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KDTree* KDTreeBuilder::createKDTree(osg::Geometry* geometry)
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{
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"osg::KDTreeBuilder::createKDTree()"<<std::endl;
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#endif
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osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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if (!vertices) return 0;
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if (vertices->size() <= _targetNumTrianglesPerLeaf) return 0;
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osg::ref_ptr<KDTree> kdTree = new KDTree;
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kdTree->_geometry = geometry;
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kdTree->_bb = kdTree->_geometry->getBound();
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kdTree->_vertices = vertices;
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unsigned int estimatedSize = (unsigned int)(2.0*float(vertices->size())/float(_targetNumTrianglesPerLeaf));
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"kdTree->_kdNodes.reserve()="<<estimatedSize<<std::endl<<std::endl;
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#endif
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kdTree->_kdNodes.reserve(estimatedSize);
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kdTree->_kdLeaves.reserve(estimatedSize);
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computeDivisions(*kdTree);
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_numVerticesProcessed += vertices->size();
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unsigned int estimatedNumTriangles = vertices->size()*2;
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kdTree->_primitiveIndices.reserve(estimatedNumTriangles);
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kdTree->_boundingBoxes.reserve(estimatedNumTriangles);
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kdTree->_triangles.reserve(estimatedNumTriangles);
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kdTree->_centers.reserve(estimatedNumTriangles);
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osg::TriangleIndexFunctor<TriangleIndicesCollector> collectTriangleIndices;
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collectTriangleIndices._kdTree = kdTree.get();
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geometry->accept(collectTriangleIndices);
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kdTree->_primitiveIndices.reserve(vertices->size());
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KDLeaf leaf(0, kdTree->_primitiveIndices.size());
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int leafNum = kdTree->addLeaf(leaf);
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osg::BoundingBox bb = kdTree->_bb;
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int nodeNum = divide(*kdTree, bb, leafNum, 0);
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"Root nodeNum="<<nodeNum<<std::endl;
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#endif
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#ifdef VERBOSE_OUTPUT
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KDTreeTraverser traverser;
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traverser.traverse(*kdTree);
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osg::notify(osg::NOTICE)<<"Final kdTree->_kdNodes.size()="<<kdTree->_kdNodes.size()<<std::endl;
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osg::notify(osg::NOTICE)<<"Final kdTree->_kdLeaves.size()="<<kdTree->_kdLeaves.size()<<std::endl;
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osg::notify(osg::NOTICE)<<"osg::KDTreeBuilder::createKDTree() completed"<<std::endl<<std::endl;
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#endif
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// osg::notify(osg::NOTICE)<<"kdTree->_kdNodes.size()="<<kdTree->_kdNodes.size()<<" estimated size = "<<estimatedSize<<std::endl;
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// osg::notify(osg::NOTICE)<<"kdTree->_kdLeaves.size()="<<kdTree->_kdLeaves.size()<<" estimated size = "<<estimatedSize<<std::endl<<std::endl;
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return kdTree.release();
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}
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void KDTreeBuilder::computeDivisions(KDTree& kdTree)
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{
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osg::Vec3 dimensions(kdTree._bb.xMax()-kdTree._bb.xMin(),
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kdTree._bb.yMax()-kdTree._bb.yMin(),
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kdTree._bb.zMax()-kdTree._bb.zMin());
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"computeDivisions("<<_maxNumLevels<<") "<<dimensions<< " { "<<std::endl;
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#endif
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kdTree._axisStack.reserve(_maxNumLevels);
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int level = 0;
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for(unsigned int level=0; level<_maxNumLevels; ++level)
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{
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int axis = 0;
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if (dimensions[0]>=dimensions[1])
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{
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if (dimensions[0]>=dimensions[2]) axis = 0;
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else axis = 2;
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}
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else if (dimensions[1]>=dimensions[2]) axis = 1;
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else axis = 2;
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kdTree._axisStack.push_back(axis);
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dimensions[axis] /= 2.0f;
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<" "<<level<<", "<<dimensions<<", "<<axis<<std::endl;
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#endif
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}
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"}"<<std::endl;
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#endif
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}
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int KDTreeBuilder::divide(KDTree& kdTree, osg::BoundingBox& bb, int nodeIndex, unsigned int level)
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{
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if (kdTree._axisStack.size()<=level) return nodeIndex;
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int axis = kdTree._axisStack[level];
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#ifdef VERBOSE_OUTPUT
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//osg::notify(osg::NOTICE)<<"divide("<<nodeIndex<<", "<<level<< "), axis="<<axis<<std::endl;
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#endif
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if (nodeIndex>=0)
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{
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#ifdef VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<" divide node"<<std::endl;
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#endif
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KDNode& node = kdTree.getNode(nodeIndex);
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return nodeIndex;
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}
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else
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{
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if (kdTree.getLeaf(nodeIndex).second<=_targetNumTrianglesPerLeaf) return nodeIndex;
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//osg::notify(osg::NOTICE)<<" divide leaf"<<std::endl;
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int nodeNum = kdTree.addNode(KDNode());
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float original_min = bb._min[axis];
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float original_max = bb._max[axis];
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float mid = (original_min+original_max)*0.5f;
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{
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KDLeaf& leaf = kdTree.getLeaf(nodeIndex);
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//osg::Vec3Array* vertices = kdTree._vertices.get();
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KDTree::CenterList& centers = kdTree._centers;
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int end = leaf.first+leaf.second-1;
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int left = leaf.first;
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int right = leaf.first+leaf.second-1;
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while(left<right)
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{
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while(left<right && (centers[kdTree._primitiveIndices[left]][axis]<=mid)) { ++left; }
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while(left<right && (centers[kdTree._primitiveIndices[right]][axis]>mid)) { --right; }
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while(left<right && (centers[kdTree._primitiveIndices[right]][axis]>mid)) { --right; }
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if (left<right)
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{
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std::swap(kdTree._primitiveIndices[left], kdTree._primitiveIndices[right]);
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++left;
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--right;
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}
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}
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if (left==right)
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{
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if (centers[kdTree._primitiveIndices[left]][axis]<=mid) ++left;
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else --right;
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}
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KDLeaf leftLeaf(leaf.first, (right-leaf.first)+1);
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KDLeaf rightLeaf(left, (end-left)+1);
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#if 0
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osg::notify(osg::NOTICE)<<"In leaf.first ="<<leaf.first <<" leaf.second ="<<leaf.second<<std::endl;
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osg::notify(osg::NOTICE)<<" leftLeaf.first ="<<leftLeaf.first <<" leftLeaf.second ="<<leftLeaf.second<<std::endl;
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osg::notify(osg::NOTICE)<<" rightLeaf.first="<<rightLeaf.first<<" rightLeaf.second="<<rightLeaf.second<<std::endl;
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osg::notify(osg::NOTICE)<<" left="<<left<<" right="<<right<<std::endl;
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if (leaf.second != (leftLeaf.second +rightLeaf.second))
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{
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osg::notify(osg::NOTICE)<<"*** Error in size, leaf.second="<<leaf.second
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<<", leftLeaf.second="<<leftLeaf.second
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<<", rightLeaf.second="<<rightLeaf.second<<std::endl;
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}
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else
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{
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osg::notify(osg::NOTICE)<<"Size OK, leaf.second="<<leaf.second
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<<", leftLeaf.second="<<leftLeaf.second
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<<", rightLeaf.second="<<rightLeaf.second<<std::endl;
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}
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#endif
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if (leftLeaf.second<=0)
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{
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//osg::notify(osg::NOTICE)<<"LeftLeaf empty"<<std::endl;
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kdTree.getNode(nodeNum).first = 0;
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kdTree.getNode(nodeNum).second = kdTree.replaceLeaf(nodeIndex, rightLeaf);
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}
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else if (rightLeaf.second<=0)
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{
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//osg::notify(osg::NOTICE)<<"RightLeaf empty"<<std::endl;
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kdTree.getNode(nodeNum).first = kdTree.replaceLeaf(nodeIndex, leftLeaf);
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kdTree.getNode(nodeNum).second = 0;
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}
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else
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{
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kdTree.getNode(nodeNum).first = kdTree.replaceLeaf(nodeIndex, leftLeaf);
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kdTree.getNode(nodeNum).second = kdTree.addLeaf(rightLeaf);
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}
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}
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int originalLeftChildIndex = kdTree.getNode(nodeNum).first;
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int originalRightChildIndex = kdTree.getNode(nodeNum).second;
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float restore = bb._max[axis];
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bb._max[axis] = mid;
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//osg::notify(osg::NOTICE)<<" divide leftLeaf "<<kdTree.getNode(nodeNum).first<<std::endl;
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int leftChildIndex = divide(kdTree, bb, originalLeftChildIndex, level+1);
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bb._max[axis] = restore;
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restore = bb._min[axis];
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bb._min[axis] = mid;
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//osg::notify(osg::NOTICE)<<" divide rightLeaf "<<kdTree.getNode(nodeNum).second<<std::endl;
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int rightChildIndex = divide(kdTree, bb, originalRightChildIndex, level+1);
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bb._min[axis] = restore;
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kdTree.getNode(nodeNum).first = leftChildIndex;
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kdTree.getNode(nodeNum).second = rightChildIndex;
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return nodeNum;
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}
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}
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}
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