I had been thinking about my recent experiments with crevice grime and decide to
see how it does with outside edges.

This is my first thought at it:  I simply used a larger angle (>90deg) and
inversed my control depth function.   With this method you absolutely need a
surface offset for it to work.

Refence:
Image Height:200
Control depth: 1.0
Control angle: 100
Surface offset: 0.1

-tgq

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