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Completed implementation of a the new CombineLODsVisitor, ideal for use with

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the .flt loader.  Code is stuff currently in sgv, but will be moved out once
more testing has been done.
This commit is contained in:
Robert Osfield
2001-10-16 14:24:38 +00:00
parent a9564008f3
commit 0bce843960
1 changed files with 76 additions and 33 deletions
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109
src/Demos/sgv/sgv.cpp
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@@ -227,7 +227,10 @@ class CombineLODsVisitor : public osg::NodeVisitor
{
for(int i=0;i<lod.getNumParents();++i)
{
_groupList.insert(lod.getParent(i));
if (typeid(*lod.getParent(i))==typeid(osg::Group))
{
_groupList.insert(lod.getParent(i));
}
}
traverse(lod);
}
@@ -240,14 +243,10 @@ class CombineLODsVisitor : public osg::NodeVisitor
++itr)
{
osg::Group* group = *itr;
typedef std::multimap<float,osg::LOD*> RangeLODMap;
typedef std::set<osg::LOD*> LODSet;
typedef std::multimap<osg::Vec3,osg::LOD*> CenterLODMap;
typedef std::set<osg::Node*> NodeSet;
CenterLODMap centerLODMap;
NodeSet otherChildren;
LODSet lodChildren;
for(int i=0;i<group->getNumChildren();++i)
{
@@ -255,33 +254,76 @@ class CombineLODsVisitor : public osg::NodeVisitor
osg::LOD* lod = dynamic_cast<osg::LOD*>(child);
if (lod)
{
centerLODMap.insert(std::pair<osg::Vec3,osg::LOD*>(lod->getCenter(),lod));
}
else
{
otherChildren.insert(child);
if (lod->getNumRanges()-1==lod->getNumChildren())
{
lodChildren.insert(lod);
}
else
{
// wonky LOD, numRanges should = numChildren+1
}
}
}
cout << "Group "<<group<<endl;
for(CenterLODMap::iterator clod_itr=centerLODMap.begin();
clod_itr!=centerLODMap.end();
++clod_itr)
if (lodChildren.size()>=2)
{
cout << " center ("<<clod_itr->first<<")";
osg::LOD* lod = clod_itr->second;
for(int i=0;i<lod->getNumRanges();++i)
osg::BoundingBox bb;
LODSet::iterator lod_itr;
for(lod_itr=lodChildren.begin();
lod_itr!=lodChildren.end();
++lod_itr)
{
cout << ", "<< lod->getRange(i);
}
cout <<endl;
}
for(NodeSet::iterator oc_itr=otherChildren.begin();
oc_itr!=otherChildren.end();
++oc_itr)
{
cout << " other child "<<*oc_itr<<endl;
bb.expandBy((*lod_itr)->getCenter());
}
if (bb.radius()<1e-2)
{
typedef std::pair<float,float> RangePair;
typedef std::multimap<RangePair,osg::Node*> RangeMap;
RangeMap rangeMap;
float maxRange = 0.0f;
for(lod_itr=lodChildren.begin();
lod_itr!=lodChildren.end();
++lod_itr)
{
osg::LOD* lod = *lod_itr;
for(int i=0;i<lod->getNumRanges()-1;++i)
{
if (maxRange<lod->getRange(i+1)) maxRange = lod->getRange(i+1);
rangeMap.insert(RangeMap::value_type(RangePair(lod->getRange(i),lod->getRange(i+1)),lod->getChild(i)));
}
}
// create new LOD containing all other LOD's children.
osg::LOD* newLOD = new osg::LOD;
newLOD->setName("newLOD");
newLOD->setCenter(bb.center());
int i=0;
for(RangeMap::iterator c_itr=rangeMap.begin();
c_itr!=rangeMap.end();
++c_itr,++i)
{
newLOD->setRange(i,c_itr->first.first);
newLOD->addChild(c_itr->second);
}
newLOD->setRange(i,maxRange);
// add LOD into parent.
group->addChild(newLOD);
// remove all the old LOD's from group.
for(lod_itr=lodChildren.begin();
lod_itr!=lodChildren.end();
++lod_itr)
{
group->removeChild(*lod_itr);
}
}
}
}
_groupList.clear();
@@ -419,7 +461,11 @@ int main( int argc, char **argv )
rootnode->accept(osv);
osv.optimize();
#endif
/*
CombineLODsVisitor clv;
rootnode->accept(clv);
clv.combineLODs();
FlattenStaticTransformsVisitor fstv;
rootnode->accept(fstv);
fstv.removeTransforms();
@@ -428,10 +474,7 @@ int main( int argc, char **argv )
rootnode->accept(rrnv);
rrnv.removeRedundentNodes();
CombineLODsVisitor clv;
rootnode->accept(clv);
clv.combineLODs();
*/
// initialize the viewer.
osgGLUT::Viewer viewer;
viewer.addViewport( rootnode );