On Tue, 26 Jun 2007, adrian wrote:
we're rendering premultiplied, and the result is fine, as alan says, if we
composit using node based ADD, then your background gets dropped
in later down the tree
however, lots of people still comp in afterfx (cos it's better damnit, don't
argue!)
the issue then is when you ADD on layer over another, any layers UNDERNEATH
are also added to, and you get gohstly glowing 3d over
your backgrounds..... not cool!
i have put a scn file here, if anyone wants repro;
http://www.fluid-pictures.com/public/matte_conundrum.scn
You could just multiply the background by the inverse of the alpha before
you do your add. Is that what you want?
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging | -------------------------------------
St. Louis, MO | Show Reel http://LAFFEY.tv/?e06078
USA | -------------------------------------
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