> > So, I guess punch-through transparency
> > (http://www.btinternet.com/~mike.pye/transparency4.jpg) for image-maps
is
> > not supported then? It's a pretty common technique in real-time
rendering to
> > reduce polygon count, and for simplifying the modelling process.
>
>   Are you sure that if you use phong highlights in a scanline-rendering
> engine (eg. OpenGL) it will not do the same thing as POV-Ray?

This is standard practice when modelling for games. Certainly Direct3D
supports it and correctly renders it (in my experience). It is an incredibly
effective technique (as long as you don't look too closely :-) ) For example
the holes punched through the side of the wheel supports in this image
(http://www.amabilis.com/gallery/Alex%20Grigny%20de%20Castro%20-%20Sojourner
%20-%20Large.jpg) would not be renderable with POVRay. They would look like
they have a shiny glass surface over them.

Richard

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