Hiya,
I have a bunch of shapes that can be kind of complex that I want to
draw in osg, and I only have their border points available. I can draw
them fine if I use the tessellator util. What I'd like to know is what
underlying primitives are sent to OpenGL when I do tessellation. For
example, here's some code:
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
geom->setVertexArray(vertices.get());
geom->addPrimitiveSet(new osg::DrawArrays(GL_POLYGON,0,numOuterPolyPoints));
geom->addPrimitiveSet(new osg::DrawArrays(GL_POLYGON,numOuterPolyPoints,
numInnerPolyPoints));
osgUtil::Tessellator geomTess;
geomTess.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
geomTess.retessellatePolygons(*geom);
osg::ref_ptr<osg::Geode> nodeGeom = new osg::Geode;
nodeArea->addDrawable(geom);
myRootNode->addChild(nodeGeom);
I've read that GL_POLYGON is slow, unavailable with OpenGL ES and even
deprecated after 3.x. Does the Tessellator change the initial
primitive type? Should I be doing the above code differently to
maximize compatibility and/or performance (ie use a triangle
primitive)? If so, how?
Regards,
Preet
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