public void AddGeometry(rthsMeshInstanceData mesh, rthsHitMask rmask, rthsHitMask cmask)
{
rthsRendererAddGeometry(self, mesh, rmask, cmask);
}
[DllImport("rths")] static extern void rthsRendererAddGeometry(IntPtr self, rthsMeshInstanceData mesh, rthsHitMask rmask, rthsHitMask cmask);