Robert McGregor's recent comments on using AO for grime layers tweaked me
thinking about how to achieve an object pattern that could do this.  I was
thinking along the lines that we have slope and aoi patterns for example that
depend upon the object surface itself, would it be possible to have a pattern
that basically for any given surface point, shoots a trace ray or the like,
normal out from the surface and returns the value or a function based on
distance to self-intersection, likely an inverse function ranging from no
intersection=0 (1/inf=0) to immediate=1 (0/1=0).

Does this sound like something doable without unacceptable increase in render
overhead?

-tgq

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