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Added support for using pixel size control of LOD levels.

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This commit is contained in:
Robert Osfield
2004-06-30 19:07:05 +00:00
parent b22de2eba0
commit a8ee967f14
3 changed files with 156 additions and 3 deletions
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29
src/osg/LOD.cpp
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@@ -11,6 +11,7 @@
* OpenSceneGraph Public License for more details.
*/
#include <osg/LOD>
#include <osg/CullStack>
#include <algorithm>
@@ -39,13 +40,35 @@ void LOD::traverse(NodeVisitor& nv)
break;
case(NodeVisitor::TRAVERSE_ACTIVE_CHILDREN):
{
float distance = nv.getDistanceToEyePoint(getCenter(),true);
float required_range = 0;
if (_rangeMode==DISTANCE_FROM_EYE_POINT)
{
required_range = nv.getDistanceToEyePoint(getCenter(),true);
}
else
{
osg::CullStack* cullStack = dynamic_cast<osg::CullStack*>(&nv);
if (cullStack)
{
required_range = cullStack->pixelSize(getBound());
}
else
{
// fallback to selecting the highest res tile by
// finding out the max range
for(unsigned int i=0;i<_rangeList.size();++i)
{
required_range = osg::minimum(required_range,_rangeList[i].first);
}
}
}
unsigned int numChildren = _children.size();
if (_rangeList.size()<numChildren) numChildren=_rangeList.size();
for(unsigned int i=0;i<numChildren;++i)
{
if (_rangeList[i].first<=distance && distance<_rangeList[i].second)
if (_rangeList[i].first<=required_range && required_range<_rangeList[i].second)
{
_children[i]->accept(nv);
}