Stephen wrote:

> Congratulations Mike, but excuse my ignorance. What is the difference between
> normal maps and bump maps?

A normal map stores the (relative) surface normal vectors in the RGB 
channels of the image, whereas a bump map (which POV-Ray uses) stores 
the perceived height of the surface as a gray value.

Normal maps are actually more flexible in how they can alter the surface 
normal of an image than bump maps. But, obviously these don't work in 
POV-Ray yet.

-- 
~Mike

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