Sorry to revive this thread from the dead but I'm trying to achieve a similar effect but I can't get your example, Rob, to work. The gridshapes are rendered to the texture (if I connect a pwindow and bang the texture I see them) but not the videoplane? Does the render object have to be told to stop rendering to cap_tex and back to the regular render context? How would I do this? I have looked through the reference and online help and to_texture seems to be undocumented.