Hello, I have some questions about how to set up, change dynamically and resize vertex and index arrays for geometrys.
So far I have constructed my geometries along the lines of the osgGeometry-Example. Whenever the vertices had changed I had assigned a new vertex array, and this way everything works. But: My profiler tells me that I spend much time constructing new osg::vec3 and pushing them back to std::vectors all the time. While I think I could easily just change the vertices within the vertex-array the problem is not as simple as that, as not only the positions but the number of vertices change. So my question: Is there a documentation about how to use the index-arrays? If not, could please someone explain how to use them? I would like to - let the vertex-array stay the same size all the time - control which vertices are used with an index array If I have four vertices, is it as easy as pushing back numbers 0, 1, 2, 1, 2, 3 to the index-array and I get two triangles sharing vertices 1 and 2? And does the geometry use the index-array automatically if there is one? Because at the moment I don´t have an index-array and the geometry just uses all the vertices. And if so, how can I change the size of the index array? Do I have to resize the std::vector containing the indices, or is there a way of telling osg::geometry about how many indices should be used? Regards, Andreas _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
