premultiplication and renderpasses [img]

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Search this Thread Display Modes
  08 August 2009
premultiplication and renderpasses [img]

Okay, I've had trouble in the past with premultiplication. I though it was great as I had full RGB and clean alpha. I had some problems with SSS and premultiplication during the year, posted here, and got warnings from Djx/masterzap if I remember, but did not listen.

Here's my problem (the spots in all my passes);

(simple mia+fg on 2009)

Is it generally a bad idea to use premultiplication then, and why is it there?

Why do these spots appear ? (I've fiddled with clipping/buffer properties to no avail)

Thank you for your input.

maya@reddit r/maya

Last edited by berniebernie : 08 August 2009 at 05:02 PM.
  08 August 2009
Although this doesnt look great here, how does it look once you've multiplied your alpha in comp?

If you do a mult div in comp with the pre-multed image, does it look like your rendered version?

Last edited by ndeboar : 08 August 2009 at 04:57 PM.
  08 August 2009
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 07:10 PM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.