Hi Preet,
I recently submitted a modification to Tesselator that allows to do that.
You have to modify the underlying gluTesselator Callbacks to use
GLU_TESS_EDGE_FLAG
Here is an example.
void CALLBACK noStripCallback(GLboolean userData)
{
}
#include <osg/GLU>
class CustomTessellator : public osgUtil::Tessellator
{
public:
virtual void beginTessellation()
{
reset();
if (!_tobj) _tobj = osg::gluNewTess();
osg::gluTessCallback(_tobj, GLU_TESS_VERTEX_DATA,
(osg::GLU_TESS_CALLBACK) osgUtil::Tessellator::vertexCallback);
osg::gluTessCallback(_tobj, GLU_TESS_BEGIN_DATA,
(osg::GLU_TESS_CALLBACK) osgUtil::Tessellator::beginCallback);
osg::gluTessCallback(_tobj, GLU_TESS_END_DATA,
(osg::GLU_TESS_CALLBACK) osgUtil::Tessellator::endCallback);
osg::gluTessCallback(_tobj,
GLU_TESS_COMBINE_DATA,(osg::GLU_TESS_CALLBACK)
osgUtil::Tessellator::combineCallback);
osg::gluTessCallback(_tobj, GLU_TESS_ERROR_DATA,
(osg::GLU_TESS_CALLBACK) osgUtil::Tessellator::errorCallback);
//Here is the New TESS Callback :
//Force to only creates triangles
osg::gluTessCallback(_tobj, GLU_TESS_EDGE_FLAG,
(osg::GLU_TESS_CALLBACK) noStripCallback);
if (tessNormal.length()>0.0) osg::gluTessNormal(_tobj, tessNormal.x(),
tessNormal.y(), tessNormal.z());
osg::gluTessBeginPolygon(_tobj,this);
}
};
Luc
De :
Preet <[email protected]>
A :
OpenSceneGraph Users <[email protected]>
Date:
22/07/2012 07:14
Objet :
[osg-users] Example using osgUtil::Tessellator to only get back
GL_TRIANGLE primitives?
Envoyé par :
[email protected]
Is there anyway to use osgUtil::Tessellator to only get back
GL_TRIANGLE primitives? With the available examples, the tessellator
adds/changes the primitive sets of the osg::Geometry passed to it into
multiple triangle fans, triangle strips, and triangles. I want my
geometry to just consist of GL_TRIANGLE draw calls.
Also, there's another method of using the tessellator where it looks
like you manually define contours / add vertices, etc, but I can't
figure out how to use it. Could anyone provide a small example, or
maybe point out what I'm doing wrong:
osgUtil::Tessellator myTess;
myTess.setTessellationNormal(offsetVec);
myTess.beginTessellation();
myTess.beginContour();
for(int i=0; i < areaVx->size(); i++) {
osg::Vec3 * someVertexPtr = &someVertex;
myTess.addVertex(someVertexPtr);
}
myTess.endContour();
myTess.endTessellation();
std::cout << "Num Contours " << myTess.getContours().size(); //
gives me a zero
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