Thanks - I had combined two different problems into one question so it wasn't clear.
The first problem was - I have a subset of vertices that I want to flag in some way. One obvious way of doing this was to make a POINTS primitiveset drawable of them. But I don't want them to be drawn as points - I was wondering if there was a way of having all the functions of a drawable (memory, loading, saving) but no drawing. Perhaps by defining my own GL_MODE or by setting some parameter that stops them being rendered. The second problem was having a single vertexarray shared by multiple drawables. If I needed to get the range of vertices used by drawable 'A' the only option was to walk each drawable finding the high/lowest indices of say a triangle mesh. It occured that this had the same solution - if I just stored a drawarray for each component (cheap since it just has a start and end index) then I can quickly find which vertices are which component. But again I don't want to actually draw these. I thought perhaps OSG might internally store the ranges of vertexes for each drawable for it's own reasons and that's what getNumIndices() did. The quick fix solution is probably to use a vertexattribarray rather than try and subvert OSG's drawables. Long term the new osg2 format makes it much easier to add custom types. Thanks for your time Martin ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=26630#26630 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
