Wasn't it Warp who wrote:
>  I have thought about this same thing myself as well: How to create
>a semi-transparent shadow of an object, which is projected onto the surface
>of an invisible object (eg. a plane)?
>  There doesn't seem to be any viable and easy solution currently.

It's not all that difficult to do with the official version of POV. 
It just needs two passes.

<http://www.econym.demon.co.uk/shadowtut>

-- 
Mike Williams
Gentleman of Leisure

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