matte object problem with ceiling in room

[themaxxer]

hello there

please help me with a strange issue... is it me or is there something broken in v-ray? (newest version)

If I want to mask a chair in a room and set the room via matte objects in the v-ray properties, the chair is rendered brighter if there is a ceiling in the room... if I turn off the ceiling, the chair renders correctly.

with ceiling


without ceiling




any ideas how to solve this problem?

thanks and happy working!
themaxxer

[themaxxer]

here's another example, same problem...

no ceiling


with ceiling

[vladimir_krastev]

Hi, thanks for posting.

You have to uncheck the "no GI on other mattes" checker.


Test it out and let us know how it goes.

[themaxxer]

thanks for reply. yes I have read this before, but then the alpha channel is broken...

[vladimir_krastev]

Hi,

the alpha channel is broken

Probably you are not applying all the checkers. I made an example scene for you (attached). Could you check it out and let us know if it will work for you?