Mike Williams <nos### [at] econymdemoncouk> wrote:
[..very useful info..]
>
> Then, in the final render, use
>
>    pigment {image_map {gif "shadow2.gif" once
>        transmit all 0.3   // dark bits partially transparent
>        transmit 230,1     // bright bits become 100% transparent
>      }
>
> [replace "230" by whatever palette number you found]
>
> this sets all the colours other than white to be partially transparent,
> and the white bits to be invisible.
>

Great, this seems to be just what I was looking for!

Oh, and the site says "With the official version of POVRay, you can only
cast shadows onto backgrounds that are visible" - does this imply, there's
an inofficial version which lets me do this in another way?

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