Hi, I'm facing the same problem, and I can't pre-compute vertex attributes on CPU because my vertex are moved by the shader him-self (displacement mapping).
I've tried to use double matrices, but these leads to a lot of compatibility problem. Since the precision problem is in the "temporary computation" and not in the final result (result values are small and fit well in a 32 bits float) I precompute (on CPU) lot of values in a 2048 (or 4096) pixels wide Texture1D. In the shader I have only to read in this look-up-table. There are some limitations (linear sampling, max input value in look up table...) but for my problem, it works very well. Cheers, Aurelien ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57581#57581 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
