Couldn't tweak it any better so here it is. I rendered the "Arnold"
grime map from scene camera position using orthographic camera
and aligned in the scene to project from the camera position.

texture{
  image_pattern{sys "grime_map.bmp"}
  texture_map{
    [0.6 Grime]
    [1 Metal]
  }
}


The problem with using radiosity to simulate accessibility
is that small surface variations on high visibility area get
outweighted by big low visibility areas. Some kind of local
equalization/high-pass operation would make it work better.


_____________
Kari Kivisalo

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