501 lines
15 KiB
C++
501 lines
15 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 <osgDB/ReadFile>
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#define _GLIBCXX_DEBUG
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#include <osg/ArgumentParser>
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#include <osg/ApplicationUsage>
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#include <osg/Timer>
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#include <osg/CoordinateSystemNode>
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#include <osg/Notify>
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#include <osg/io_utils>
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#include <osg/Geometry>
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#include <osgUtil/IntersectionVisitor>
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#include <osgUtil/LineSegmentIntersector>
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#include <osgSim/LineOfSight>
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#include <osgSim/HeightAboveTerrain>
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#include <osgSim/ElevationSlice>
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#include <iostream>
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namespace osg
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{
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class KDNode
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{
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public:
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KDNode():
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_leftChild(0),
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_rightChild(0) {}
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KDNode(const KDNode& rhs):
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_leftChild(rhs._leftChild),
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_rightChild(rhs._rightChild) {}
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KDNode& operator = (const KDNode& rhs)
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{
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_leftChild = rhs._leftChild;
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_rightChild = rhs._rightChild;
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return *this;
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}
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typedef short value_type;
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value_type _leftChild;
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value_type _rightChild;
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};
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class KDLeaf : public osg::Referenced
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{
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public:
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KDLeaf() {}
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typedef unsigned int index_type;
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typedef std::vector< index_type > Indices;
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Indices _vertexIndices;
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protected:
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virtual ~KDLeaf() {}
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};
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class KDTree : public osg::Shape
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{
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public:
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KDTree() {}
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KDTree(const KDTree& rhs, const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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Shape(rhs,copyop) {}
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META_Shape(osg, KDTree)
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typedef std::vector< unsigned int > AxisStack;
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typedef std::vector< KDNode > KDNodeList;
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typedef std::vector< osg::ref_ptr<KDLeaf> > KDLeafList;
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/// note, leafNum is negative to distinguish from nodeNum
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int addLeaf(KDLeaf* leaf) { int num = _kdLeaves.size(); _kdLeaves.push_back(leaf); return -(num+1); }
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int replaceLeaf(int leafNum, KDLeaf* leaf)
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{
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int num = -leafNum-1;
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if (num>_kdLeaves.size()-1)
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{
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osg::notify(osg::NOTICE)<<"Warning: replaceChild("<<leafNum<<", leaf), num = "<<num<<" _kdLeaves.size()="<<_kdLeaves.size()<<std::endl;
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return leafNum;
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}
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_kdLeaves[num] = leaf; return leafNum;
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}
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/// note, leafNum is negative to distinguish from nodeNum
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KDLeaf* getLeaf(int leafNum)
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{
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int num = -leafNum-1;
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if (num<0 || num>_kdLeaves.size()-1)
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{
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osg::notify(osg::NOTICE)<<"Warning: getLeaf("<<leafNum<<", num = "<<num<<") _kdLeaves.size()="<<_kdLeaves.size()<<std::endl;
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return 0;
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}
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return _kdLeaves[num].get();
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}
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int addNode(const KDNode& node)
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{
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int num = _kdNodes.size();
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_kdNodes.push_back(node);
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return num;
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}
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/// note, nodeNum is positive to distinguish from leftNum
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KDNode& getNode(int nodeNum)
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{
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if (nodeNum<0 || nodeNum>_kdNodes.size()-1)
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{
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osg::notify(osg::NOTICE)<<"Warning: getNode("<<nodeNum<<") _kdNodes.size()="<<_kdNodes.size()<<std::endl;
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}
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return _kdNodes[nodeNum];
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}
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osg::observer_ptr<osg::Geometry> _geometry;
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osg::BoundingBox _bb;
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AxisStack _axisStack;
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KDNodeList _kdNodes;
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KDLeafList _kdLeaves;
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};
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class KDTreeTraverser
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{
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public:
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std::ostream& output(unsigned int level)
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{
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for(unsigned int i=0; i<level; ++i)
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{
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osg::notify(osg::NOTICE)<<" ";
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}
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return osg::notify(osg::NOTICE);
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}
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void traverse(KDLeaf& leaf, unsigned int level)
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{
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output(level)<<"leaf("<<level<<") { ";
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for(unsigned int i=0; i<leaf._vertexIndices.size(); ++i)
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{
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if (i==0) osg::notify(osg::NOTICE)<<leaf._vertexIndices[i];
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else osg::notify(osg::NOTICE)<<", "<<leaf._vertexIndices[i];
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}
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osg::notify(osg::NOTICE)<<"}"<<std::endl;;
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}
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void traverse(KDTree& tree, KDNode::value_type nodeIndex, unsigned int level)
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{
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output(level)<<"traverse("<<nodeIndex<<", "<< level<<") { "<<std::endl;
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if (nodeIndex>=0)
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{
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KDNode& node = tree._kdNodes[nodeIndex];
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if (node._leftChild) traverse(tree,node._leftChild,level+1);
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else output(level+1)<<"empty left child()"<<std::endl;
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if (node._rightChild) traverse(tree,node._rightChild,level+1);
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else output(level+1)<<"empty right child()"<<std::endl;
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}
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else
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{
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KDNode::value_type leafIndex = -nodeIndex-1;
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KDLeaf& leaf = *(tree._kdLeaves[leafIndex]);
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traverse(leaf, level);
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}
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output(level)<<"}"<<std::endl;;
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}
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void traverse(KDTree& tree)
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{
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osg::notify(osg::NOTICE)<<"traverse(tree)"<<std::endl;
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if (!tree._kdNodes.empty())
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{
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traverse(tree,0,0);
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}
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else if (!tree._kdLeaves.empty())
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{
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traverse(*tree._kdLeaves.front(), 0);
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}
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}
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};
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class KDTreeBuilder : public osg::NodeVisitor
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{
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public:
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KDTreeBuilder():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
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_maxNumLevels(24),
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_targetNumVerticesPerLeaf(8),
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_numVerticesProcessed(0)
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{
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}
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void apply(osg::Geode& geode)
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{
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for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
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{
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osg::Geometry* geom = geode.getDrawable(i)->asGeometry();
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if (geom)
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{
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geom->setShape(createKDTree(geom));
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}
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}
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}
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KDTree* createKDTree(osg::Geometry* geometry);
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void computeDivisions(KDTree& kdTree);
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int divide(KDTree& kdTree, osg::BoundingBox& bb, int nodeIndex, unsigned int level);
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unsigned int _maxNumLevels;
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unsigned int _targetNumVerticesPerLeaf;
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unsigned int _numVerticesProcessed;
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};
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KDTree* KDTreeBuilder::createKDTree(osg::Geometry* geometry)
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{
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#if 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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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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unsigned int estimatedSize = (unsigned int)(float(vertices->size())/float(_targetNumVerticesPerLeaf)*1.5);
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#if 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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// create initial leaf list
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KDLeaf* leaf = new KDLeaf;
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leaf->_vertexIndices.reserve(vertices->size());
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for(unsigned int i=0; i<vertices->size(); ++i)
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{
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leaf->_vertexIndices.push_back(i);
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}
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osg::BoundingBox bb = kdTree->_bb;
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int leafNum = kdTree->addLeaf(leaf);
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int nodeNum = divide(*kdTree, bb, leafNum, 0);
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#if VERBOSE_OUTPUT
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osg::notify(osg::NOTICE)<<"Root nodeNum="<<nodeNum<<std::endl;
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#endif
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#if 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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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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#if 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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#if 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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#if 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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#if 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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#if 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)->_vertexIndices.size()<=_targetNumVerticesPerLeaf) 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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osg::ref_ptr<KDLeaf> leaf = kdTree.getLeaf(nodeIndex);
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// create new node, and add two leaves to it.
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osg::ref_ptr<KDLeaf> leftLeaf = new KDLeaf;
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osg::ref_ptr<KDLeaf> rightLeaf = new KDLeaf;
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osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(kdTree._geometry->getVertexArray());
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//osg::notify(osg::NOTICE)<<" divide leaf->_vertexIndices.size()="<<leaf->_vertexIndices.size()<<std::endl;
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unsigned int estimatedSize = leaf->_vertexIndices.size();
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leftLeaf->_vertexIndices.reserve(estimatedSize);
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rightLeaf->_vertexIndices.reserve(estimatedSize);
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for(unsigned int i=0; i<leaf->_vertexIndices.size(); ++i)
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{
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unsigned int vi = leaf->_vertexIndices[i];
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osg::Vec3& v = (*vertices)[vi];
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if (v[axis] <= mid) leftLeaf->_vertexIndices.push_back(vi);
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else rightLeaf->_vertexIndices.push_back(vi);
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}
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if (leftLeaf->_vertexIndices.empty())
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{
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//osg::notify(osg::NOTICE)<<"LeftLeaf empty"<<std::endl;
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kdTree.getNode(nodeNum)._leftChild = 0;
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kdTree.getNode(nodeNum)._rightChild = kdTree.replaceLeaf(nodeIndex, rightLeaf.get());
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}
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else if (rightLeaf->_vertexIndices.empty())
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{
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//osg::notify(osg::NOTICE)<<"RightLeaf empty"<<std::endl;
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kdTree.getNode(nodeNum)._leftChild = kdTree.replaceLeaf(nodeIndex, leftLeaf.get());
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kdTree.getNode(nodeNum)._rightChild = 0;
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}
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else
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{
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kdTree.getNode(nodeNum)._leftChild = kdTree.replaceLeaf(nodeIndex, leftLeaf.get());
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kdTree.getNode(nodeNum)._rightChild = kdTree.addLeaf(rightLeaf.get());
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}
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}
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int originalLeftChildIndex = kdTree.getNode(nodeNum)._leftChild;
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int originalRightChildIndex = kdTree.getNode(nodeNum)._rightChild;
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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)._leftChild<<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)._rightChild<<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)._leftChild = leftChildIndex;
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kdTree.getNode(nodeNum)._rightChild = rightChildIndex;
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return nodeNum;
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}
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}
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}
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int main(int argc, char **argv)
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
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if (!scene)
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{
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std::cout<<"No model loaded, please specify a valid model on the command line."<<std::endl;
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return 0;
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}
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osg::Timer_t start = osg::Timer::instance()->tick();
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osg::KDTreeBuilder builder;
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scene->accept(builder);
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osg::Timer_t end = osg::Timer::instance()->tick();
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double time = osg::Timer::instance()->delta_s(start,end);
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osg::notify(osg::NOTICE)<<"Time to build "<<time*1000.0<<"ms "<<builder._numVerticesProcessed<<std::endl;
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osg::notify(osg::NOTICE)<<"build speed "<<(double(builder._numVerticesProcessed)/time)/1000000.0<<"M vertices per second"<<std::endl;
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return 0;
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}
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