63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#include <osg/LOD>
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#include <algorithm>
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using namespace osg;
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LOD::LOD(const LOD& lod,const CopyOp& copyop):
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Group(lod,copyop),
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_rangeList(lod._rangeList),
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_rangeList2(lod._rangeList2),
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_center(lod._center)
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{
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}
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void LOD::traverse(NodeVisitor& nv)
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{
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switch(nv.getTraversalMode())
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{
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case(NodeVisitor::TRAVERSE_ALL_CHILDREN):
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std::for_each(_children.begin(),_children.end(),NodeAcceptOp(nv));
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break;
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case(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN):
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if (_children.size()!=0) _children.front()->accept(nv);
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break;
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default:
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break;
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}
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}
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void LOD::setRange(const unsigned int index, const float range)
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{
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if (index<_rangeList.size()) _rangeList[index] = range;
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else while (index>=_rangeList.size()) _rangeList.push_back(range);
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if (index<_rangeList2.size()) _rangeList2[index] = range*range;
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else while (index>=_rangeList2.size()) _rangeList2.push_back(range*range);
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}
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const int LOD::evaluateLODChild(const Vec3& eye_local, const float bias) const
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{
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// For cache coherency, use _rangeList2 exclusively
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if (_rangeList2.empty()) return -1;
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// Test distance-squared against the stored array of squared ranges
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float LODRange = (eye_local-_center).length2()*bias;
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if (LODRange<_rangeList2[0]) return -1;
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unsigned int end_marker = _rangeList2.size()-1;
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if (end_marker>_children.size()) end_marker=_children.size();
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for(unsigned int i=0;i<end_marker;++i)
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{
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if (LODRange<_rangeList2[i+1])
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{
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return i;
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}
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}
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return -1;
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}
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