Yeah, I also agree that centering image_maps would be logical, but it has never
annoyed me, so I haven't complained. Getting height_hields to look right is a
pain anyway, so the translate -.5 thingy kinda doesn't matter. Still, you have a
point.

The other problem is much more important. I don't think it's very difficult (to
somebody much wiser than me ;)). You shouldn't need any parametric mapping in
many cases (like applying an image to only one side of a polygon or cylinder).
This is how I imagine it: if the outside surface is hit by the sample ray,
calculate the map color; if the inside is hit, don't calculate. This should be a
sufficient solution in most cases (like the bottle label example).

Margus

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