Wasn't it Benjamin Winter who wrote:
>hi,
>I'm searching for a trick to make the shadow of an object visible on an
>undergroung. but the underground is not visible. so, maybe with no_image
>or with rgbt 1 or something like that. the problem is, that if there in
>no object visible, there is no shadow. but I want to have a shadow
>without underground, is that possible? (excuse my bad english)

Is this what you want?

The POV Alpha Shadow Tutorial
<http://www.econym.demon.co.uk/shadowtut>

-- 
Mike Williams
Gentleman of Leisure

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