francoisdv

Hay all Im getting problems when rendering motion blur in mantra pbr. When I have motion blur turned on and the object or camera moves I get a strange flashing effect on the geometry. On closer inspection it renders with a strange faceting only on sertain frames and the affect looks like the image below. (its most visable in the indirec diffuse channel) The only fix I have found for it is turning backface removal on. It seems to be some sort of dicing issue that occures when motion blurring because if I play with the dicing settings the artifact changes but never goes away. Has anyone encounterd this before? what am I doing wrong? Even though its fixed with the backfece cull on I would like to understand what would cause this problem. Ive been having it on allot of diffrent objects, all alembic objects exported from maya. Thanks for you time. Francois de Villiers