I have a small problem:

I'd like to make a texture based on a bitmap (greyscale) and declare one
texture for the black areas, another texture for the white areas, and have
some average on the grey pixels (i e pretty much like a regular texture_map
but based on a bitmap in stead of POV's patterns). It seems that
material_map doesn't let me do this unless I specify a single texture for
each pixel value (which can be done using a macro and average, but that
isn't a very nice solution). Is there another way?

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