[osg-users] Questions about vertex and index arrays for geometry

Andreas Goebel a-goebel at gmx.de
Sat Oct 27 03:18:05 PDT 2007


> 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.
This worked as I expected, no problem here.
> 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?
There is still a problem: How do I tell osg::Geometry that one of the 
arrays size has chaged? It does work, of course, if I do a
again, but if I want it to stay the same vertexArray, is there a way to 
tell the geometry that its size has changed?

In other words: I would need a function like "setVertexArraySizeDirty" .


> Regards,
> Andreas
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