An alternative to these solutions is to modify the pov-ray source to do
this. The distance a ray has travelled is returned already by the
ray-tracing function, so its a very simple modification to set the pixel
output to this. This might be a easier solution if you need a very accurate
depthmap or need to customise the map further. Unless you've looked at the
Pov-ray source before, though, Tim's method is less hassle.

-Chris

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