I would like to able to assign different finishes to different areas of
a texture using a map image; call it a 'finish_map'. Having often seen
3d artists use specular or shininess maps with other programs,
I expected I would be able to in pov as well, perhaps by clever use of
material_map to map entire textures onto the object, with different
finishes for each. This doesn't produce the desired result: material_map
is designed to use indexed color images, with one texture assigned to
each color in the index. What I really want is to be able to use a black
and white image, with lighter pixels indicating that more shininess
should be applied there. What can I do?

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