Vray render elements and compositing

[Alex121]

Hi,

I can't seem to find anywhere tutorials on how to composite render elements from Maya vray without GI. I rendered an image and would like to have control over separate elements.
I know how to put together with GI, but nothing regarding without GI.

Thanks!

[R2J2]

It should be fine to follow the same procedure while ignoring GI, are you not getting the same result as the beauty render?

[Alex121]

Nope, not really working. I'm not getting the same image, it's more clear and a bit brighter. I also can't seem to control shadows separately.

[yolov]

We had a topic where compositing was discussed. Not sure if it would help your case, but if you haven't seen it yet, it might just have something useful. Here it is http://forums.chaosgroup.com/showthr...hlight=perfect

[Alex121]

I took a look at the post, but unfortunately no help.
Before I started using physical camera and properly exporting EXR I was compositing the layers in a certain way that worked. (See attached screen)
Now it's not working, left image if what I see in VRAY and right is the comp. Maybe it has to do with the gamma being different on different elements?

[Svetlozar Draganov]

Yes there is some difference but it doesn't look like a gamma-issue.
Are you sure that all of the materials in the scene are Vray-materials ?
Would it be possible to send us outputted Render Elements along with the Maya-scene ?

[Dariusz Makowski (Dadal)]

I cant remember exact blending modes. I think if you want to use ADD you need 32 bits. If 8 then screen. In 8 bit u wont get 100% match.

[Alex121]

I figured it out, It was totally the 32bit-8bit issue. Thanks!!

[MrDream]

Hi,
Pay attention on pre-multiplied and unpre-multiplied Images..... I think you were having alpha problems in there....
PS:use Nuke for compositing much much better that after effect