Alain <aze### [at] qwertyorg> wrote:
> Fact is that any emissive media IS totaly transparent by design. It adds 
> to whatever is behind, wighout filtering anything out.

  That's also the reason why emissive media is invisible against a white
background. Emissive media only adds to the passing rays, and adding something
to white results in white (after color clamping).

-- 
                                                          - Warp

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