Yea, this is exactly what I am doing right now.
Had been using and actually loving glow till now but I now caught on
that most of the scenes I used glow in
were all CG seq and not composited glowing seq.
Thanks for the confirming tip though.
Eriya
-----Original Message-----
From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf
Of David Shirk
Sent: Wednesday, January 10, 2007 10:49 AM
To: XSI(at)Softimage.COM
Subject: Re: Glow Q
Hello Eriya - If I recall, the internal glow shader does not output an
alpha that will give you a proper composite. It's a little bit of a
workaround, but you should get your desired result if you render your
glow seperately from your objects, then composite the glow using a
screen or additive transfer (ignoring its alpha channel)
Good luck
-Dave
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.
> Eriya
>
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| David Shirk | technical animator | industrial light + magic | x3555 |
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