FGFS-4.1/OpenSceneGraph
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Added handling of short (<=4 points) polygons as tri fans and the rest

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as polygons which are tesselated, to improve load and build time, yet
still resselating the large polygons that need it.
This commit is contained in:
Robert Osfield 2004-08-27 08:03:26 +00:00
parent b50f0db0a9
commit 5d8d05970e
1 changed files with 31 additions and 6 deletions
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37
src/osgPlugins/obj/ReaderWriterOBJ.cpp
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@ -268,10 +268,16 @@ osg::Geometry* ReaderWriterOBJ::convertElementListToGeometry(obj::Model& model,
}
// #define USE_DRAWARRAYLENGTHS
if (numPolygonElements>0)
{
unsigned int startPos = vertices->size();
osg::DrawArrayLengths* drawArrayLengths = new osg::DrawArrayLengths(GL_POLYGON,startPos);
#ifdef USE_DRAWARRAYLENGTHS
osg::DrawArrayLengths* drawArrayLengths = new osg::DrawArrayLengths(GL_POLYGON,startPos);
geometry->addPrimitiveSet(drawArrayLengths);
#endif
for(itr=elementList.begin();
itr!=elementList.end();
@ -280,7 +286,24 @@ osg::Geometry* ReaderWriterOBJ::convertElementListToGeometry(obj::Model& model,
obj::Element& element = *(*itr);
if (element.dataType==obj::Element::POLYGON)
{
drawArrayLengths->push_back(element.vertexIndices.size());
#ifdef USE_DRAWARRAYLENGTHS
drawArrayLengths->push_back(element.vertexIndices.size());
#else
if (element.vertexIndices.size()>4)
{
osg::DrawArrays* drawArrays = new osg::DrawArrays(GL_POLYGON,startPos,element.vertexIndices.size());
startPos += element.vertexIndices.size();
geometry->addPrimitiveSet(drawArrays);
}
else
{
osg::DrawArrays* drawArrays = new osg::DrawArrays(GL_TRIANGLE_FAN,startPos,element.vertexIndices.size());
startPos += element.vertexIndices.size();
geometry->addPrimitiveSet(drawArrays);
}
#endif
if (model.needReverse(element))
{
@ -341,7 +364,6 @@ osg::Geometry* ReaderWriterOBJ::convertElementListToGeometry(obj::Model& model,
}
}
geometry->addPrimitiveSet(drawArrayLengths);
}
@ -375,13 +397,16 @@ osg::Node* ReaderWriterOBJ::convertModelToSceneGraph(obj::Model& model)
osg::StateSet* stateset = materialToSetSetMap[es.materialName].get();
geometry->setStateSet(stateset);
// tesseleate any large polygons
osgUtil::Tesselator tesselator;
tesselator.retesselatePolygons(*geometry);
// osgUtil::Tesselator tesselator;
// tesselator.retesselatePolygons(*geometry);
// tri strip polygons to improve graphics peformance
osgUtil::TriStripVisitor tsv;
tsv.stripify(*geometry);
// if no normals present add them.
if (!geometry->getNormalArray() || geometry->getNormalArray()->getNumElements()==0)
{
osgUtil::SmoothingVisitor tsv;