A full scene sample test rendering of my crevice grime experimentations with
textures, focal blur and lighting (lightdome of course...).  The grime texture
is layered over the base texture with transparency.  I always have difficulty
getting a smooth fading transtion with transparency.

Object height: 200
Normal angle: 85
Control depth: 10
Surface offset: +0.1
Resolution: 600 (based on bounding box diagonal of ~314)

-tgq

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