Wasn't it Hombre who wrote:
>Hello !
>
>I'm currently trying to generate a POV image with transparent background to
>paste it on a real life photo. I would like to render the shadow in alpha
>channel on an invisible table (which have the 'no-image' flag on), but
>nothing appears at all... Is there a way to do this ?

You can't do it in one pass. See my web page for info on how to do it in
two passes.

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

-- 
Mike Williams
Gentleman of Leisure

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