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
a
Adrian Wyer
Fluid Pictures
33 Glasshouse Street
London
W1B 5DG
T: +44 (0) 207 434 5133
www.fluid-pictures.com
----- Original Message -----
From: "takita" <takita(at)earthlink.net>
To: <XSI(at)Softimage.COM>
Sent: Tuesday, June 26, 2007 4:49 PM
Subject: Re: Alphas, mattes, adds and overs
Are you rendering unmultiplied (e.g. what AE folks call "straight") out of
CG?
What might work (dodgy sometimes) is to render premultiplied and run it
through the unmult op in FXtree or AE's unumult plugin (lame, I know...).
But sometimes this helps make the edge consistent at least.
-T
--
A.K.I.T.A.: Artificial Killing and Immediate Troubleshooting Android
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