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compositing elements that have transparency
show user profile  zeefusion
I have a transparent object that I wish to composite together however when I use affect all channels for the transparent material the resulting comp is over bright. If I choose not to affect channels the resulting comp is the correct brightness. Is it not possible to composite elements that have affect all channels enabled on a transparent material? Using 32-bit EXR files rendered using Vray.

It may be because when I linear dodge (add) an element that has transparency it is forcing it to become too bright? Any help on this would be great.
read 425 times
1/6/2012 11:04:16 PM (last edit: 1/6/2012 11:04:16 PM)
show user profile  zeefusion
read 402 times
1/9/2012 9:45:39 AM (last edit: 1/9/2012 9:45:39 AM)
show user profile  Bolteon
dont comp in ps.

-Marko Mandaric

read 396 times
1/9/2012 9:57:46 AM (last edit: 1/9/2012 9:57:46 AM)
show user profile  advance-software
there are multiple methods of blending.

if you use add(itive) ofc it's going to become brighter. that's what adding does.

use transparent/translucent blending instead.

linear dodge is just a complicated way of saying additive blend.

read 395 times
1/9/2012 10:01:42 AM (last edit: 1/9/2012 10:13:45 AM)
show user profile  zeefusion
In Vray:

Affect all channels: all channels and render elements will be affected by the transperency of the material.

So If I layer these up in Photoshop, the result is much brighter than it should be. I think this is because The reflection layer and the GI layer shows internal reflections and internal GI of the glass box?
read 386 times
1/9/2012 10:09:46 AM (last edit: 1/9/2012 10:12:36 AM)
show user profile  Bolteon
post up images... almost certain this is because of ps.

-Marko Mandaric

read 374 times
1/9/2012 10:25:19 AM (last edit: 1/9/2012 10:25:19 AM)
show user profile  zeefusion
PSD is here

Two versions one with affect all channels and one without. I can see why it is happening because as AS has said you are adding to the brightness, but how would you get around it not happening but still keep the affect all channels?
read 370 times
1/9/2012 10:39:02 AM (last edit: 1/9/2012 10:39:22 AM)
show user profile  Bolteon
if your going to use "affect all channels"

then you don't use your refraction as part of the layering... it's techincally built into your other passes.

turn it off in the comp_b pass and you have a close match to it being on in comp_a (the difference being is in ps being a pos for compositing... did i mention that already??? :-) )


-Marko Mandaric

read 346 times
1/9/2012 11:55:34 AM (last edit: 1/9/2012 11:55:34 AM)
show user profile  zeefusion
Sweet :) Thanks for the help
read 343 times
1/9/2012 11:59:14 AM (last edit: 1/9/2012 11:59:14 AM)
show user profile  Bolteon
your welcome...

once more for good measure: stop being a pansy and comping with ps, be a real man and get good at nuke.

-Marko Mandaric

read 337 times
1/9/2012 12:03:03 PM (last edit: 1/9/2012 12:03:03 PM)
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