Strange triangles

[FredrikS]

Hello,

Attached are two pictures of a mostly reflective chrome ball also with a displacement map, reflecting a vray dome light.
Almost every frame in the sequence get the artifact with the dark triangular pattern. This pattern changes wildly for each frame.

I also got this error with a different render where the object had No displacement map at all.


Does anyone recognize and can tell me what it is and how to get rid of it?


cheers
fred

[Morbid Angel]

a wild guess but it may be your scene scale or camera clipping planes? Also have you tried turning up raybias?

[vlado]

Have you checked for overlapping geometry?

Best regards,
Vlado

[FredrikS]

Thanks for your suggestions.

I slightly upped the 'Secondary ray bias' and that seems to change things in the right direction.


But now I have the problem that the render comes out completely differently whan I render to maya's render window and when I do a maya 'Batch' render. Using the same maya scene file.

Take a look at the attached pics.
(Ignore the slight colour difference, thats just different viewers.)



Has anyone else bumped into this phenomenon?


cheers
fred

[Zdravko]

Can you send us the scene to: support@chaosgroup.com
or attached to this thread?