Brad <bra### [at] gmailcom> wrote:
> Okay, 'smoke' not tornado. Maybe this is fundamentally different, but is what
> gave me the idea that absorptive media could be used effectively in front of a
> white background.

Note that absorbing media does not take light into accoung in any way.
(The media will cast shadows, but the media itself will not be affected
by light.)

OTOH, if all you want is a cone of visible media, you can do that with
absorbing media.

-- 
                                                          - Warp

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