Mike Williams wrote:
> Rather than using stone textures, have you considered using more regular
> patterns? It might be easier for people to recognise the transformations.

That's orthogonal (at best) to my purpose.  I want pigments that show 
certain symmetries and *only* those symmetries; ideally, then, they 
shouldn't have much regularity on a scale smaller than the `tile'.

-- 
Anton Sherwood, http://www.ogre.nu/

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