Couples weird things

[Gecko]

Hello,
After completing 2 short movies , using Vray 2.20.01 on windows XP pro and Maya 2009 , i came accross a couple weird things behaviour:

First one :
Checking The Check sample visibility seems to bring up some black splotches/artefacts:


1st image with check sample visibility OFF , 2nd with ON
This is the only parameter that changed beetween the two frames.

Second one:
When creating a Character pass , i tried to put all the set (classroom) in a VrayObjectProperties , activated Matteshadow but then it seems the set doesn't cast shadows anymore.




Maybe i am doing/expecting something wrong ?

[vlado]

1st image with check sample visibility OFF , 2nd with ON This is the only parameter that changed beetween the two frames.

The check sample visibility is somewhat picky about the scene scale; in your case, what is the size of the scene?

When creating a Character pass , i tried to put all the set (classroom) in a VrayObjectProperties , activated Matteshadow but then it seems the set doesn't cast shadows anymore.

There is an option called "No GI on other mattes" in the V-Ray object properties, which you can try toggling.

Best regards,
Vlado