I'm fighting textures for my planet, with a fairly small amount of
success. The problem is that because I can't manually paint any object
(because the entire terrain is more-or-less procedural), I have to
somehow extract enough information from the model to texture it
interestingly. I'm finding it all looks very samey.

One tool that would be incredibly useful is slope patterns. That way I
can have the kind of vegetation change depending on the slope, with bare
rock on the steepest.

Unfortunately, slope's direction vector appears to be a constant. And
planets are round, which means gravity keeps changing...

Is there a way around this?

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