In POVRay, if using a spotlight, the shadows are perfectly defined. We 
all know in real life this doesn't happen, due to the diffraction of 
light as it passes an interface between two media. Of course, POVRay 
deals with the particular nature of light, not the wave nature, so how 
do we get it to blur shadows according t distance from casting object 
without resorting to area lights?

Cheers,
James Jackson.

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