CGTalk - rendering artifacts

charliedz

04-30-2009, 09:07 PM

i have a very basic nurbs model created in alias studio.

i imported it into maya for lighting and rendering. i get these weird artifacts and have no idea why after rendering.

http://www.geocities.com/dzjunction/render_issue.jpg

not sure if its am import issue, a maya issue, or a hardware issue. (i'm running maya 2009 on macbook pro os x, nvidia 8600gt). i've rendered other files fine, so not sure if its because this came from alias?

can anyone check the file on their system to see if they get the same thing? that would help debug for sure.

maya_file_link (http://fileupload.filetac.com/file/3492915c8b58b779070c9c03bde3aeae5930338d)

i did notice that i had to tell maya to import it as a "studioimport" rather than bestguess otherwise it turned my surfaces into what looked like really complex polygons.

also, just trying to view the model within maya shows even more artifacts like seen below.

id really appreciate any confirmation with this. :(

thanks

http://www.geocities.com/dzjunction/Picture1.png

05-01-2009, 08:48 AM

looks like a tesselation issue, if you go to the shape node of the nurbs objects you can increase the u and v subdivisions in the advanced tesselation tab. Also switch off secondary tesselation.

Harin

charliedz

05-01-2009, 09:01 AM

thanks harin,

increasing the uv subdiv didn't do anything for me. however if i upped the CRV Precision shaded, then it resolved it.... so not sure there.

also, the other way to resolve it was by selecting "display render tessellations" + "smooth edge"...

im not sure which is better or if there are any consequences for one or the other. let me know if you know the difference.

thanks!