The compositing is done in Avid Nitris.
Tho't Avid and Softimage goes pretty friendly but the glow seems to be
Softimage environment only kinda thing.
Thanks,
Eriya
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
Of Joe Laffey
Sent: Wednesday, January 10, 2007 11:02 AM
To: XSI(at)Softimage.COM
Subject: Re: Glow Q
On Wed, 10 Jan 2007, Eriya Ito wrote:
> Hi all,
> Quick question about glow.
>
> I have this object with a 'beautiful' glow on.
> I render only the object out with the glow and was thinking of
> compositing it later with BG video footage.
> But when I do that, the glow somehow ends up dark or black rays.
> Something in me tells that it's a alpha premultiply problem.
> Does anybody know any kind of workaround?
> I am tempted to render out the video footage with the glow on but the
> director wants them separate.
>
> I remember having same kind of problem with fire particles.
> Any suggestions appreciated, thanks.
How are you currently compositing the passes? Using XSI, or some other
app? You will need to be sure you are doing an additive composite if the
sources are premultiplied, or doing a subtractive composite if they are
not.
Another thing you might try for glows is to composite them in using
Screen or Add mode. All of these things are done a little differently
depending on the compositing app. (These are probably more compositing
Q's for compositing lists/forums, but since XSI has a built-in
compositor...)
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging | -------------------------------------
St. Louis, MO | Show Reel http://LAFFEY.tv/?e04095
USA | -------------------------------------
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