Hi,

The recent ambient occlusion thread(s) got me thinking about a way to 
use a radiosity-derived dirtmap pigment which would not affect (final) 
render times too much. The idea is to pre-render the object with a white 
background and radiosity, and use that image as a mask for the final 
image. But I want the image data available as a pigment for the target 
object. screen.inc won't accomplish this, AKAIK, plus I like to use a 
fisheye lens for all my scenes (I always hide the black circle border).

My most successful attempt used a translated and scaled image with 
warp{spherical} applied. Point_At_Trans aligned the pigment to the 
target object. The pigment was then translated to the camera's position, 
but was applied to the target object. From there I could add different 
pigments/textures to the white and black areas, thus creating the effect 
of rust in corners, as an example.

The problem is that the edges of the image pigment don't match up to the 
edges of the render window. I got pretty darn close by experimenting 
with different values, but the image's edge curve is always different.

Has anyone run into a similar problem? Any solutions? Can anyone think 
of something that *might* work? I would like to keep using my fisheye 
lens camera, but I'm afraid a real solution to my problem would only 
work with the standard type.

Thanks in advance~

~Sam

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