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I just forgot to mention: this would allow one, for instance, to create an RGB-space rainbow color gradient, analogous to the HSB one (color.lineargradient.Rainbow), but usable in surface plots. The surface style currently does not support the HSB color space because "colorspace string not available for hsb colors".
This issue has been addressed by the PyX 0.12 release. There is a rgbgradient and cmykgradient to convert a given gradient into another color space. Unfortunately such conversion is the only option available, as neither PostScript nor PDF support the HSB colorspace for bitmap and mesh output.
Regarding the cyclic variable, there is no built-in support at the moment, but it can easily be accomplished by derivation of the style like done in www/png/example.py available in the repository.
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