NOTE: stucci didn't return 'intensity' since blender 1.0, something that
alsways caused headaches all over (all other textures do per definition).
But, allowing stucci to return 'intensity' would break old files.
To make it work for preview, I had to solve this once. Done with a version
patch, so old files (including current 2.41!) won't read with color channel
active for Stucci textures.
(Preview.blend I saved as a 2.42 file btw!)
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