Render Artifacts using Mental Ray - Inflate and Pinch

[Jgary]

Attempting my first model using Zbrush with rendering in Mental Ray/Maya. I painted most of the displacements using the inflate and pinch brushes then exported using adaptive mode. The rendering in Maya is showing some artifacts that I have been unable to get rid of (see images). I’ve tried many different settings (Smooth UV, different resolution maps, GUV versus my manually laid out UV’s, etc.) but the only thing that has worked is saving out an .obj from level 2, using that model as the base in Maya and generating displacements from level 2 up. If possible I would like to use my level 1 geo since it’s quite a bit lower rez. Is it a bad idea to use the inflate and pinch brushes for most of the displacement work as I have done?

Thanks for help,
Jason Gary

Attachments

[aurick]

When you’ve used brushes like Inflate and Pinch you’ll need to use Tool>Displacement>Adaptive mode rather than DPSubPix to create the displacement map. You won’t always get perfect results, but this mode was created specifically to help compensate for those editing methods.

[Jgary]

The Maya/Mental Ray rendered result I have posted is using displacement maps exported using adaptive mode. Am I pushing the base mesh too far with the pinch and inflate tools and that’s why I’m getting these artifacts? This first object is just a test to get me used to the process, but I would like to figure this out so I don’t repeat these errors.

Thanks

[joyster]

maaan, i think i have the same problem! i have used the inflate on lips and on some parts of the body. Back in maya when i use mental ray for rendering i get alot of artifacts when i have converted my mesh to subd, but when i render the mesh in smooth polygons, it looks alittle bit better though. And one more thing, when i create displacement maps i use MD2 and how shall i export it in there, there is no adaptive mode in there…or? Why is this strange artifact happen when rendering in subd but not in smoothpoly? are you supposed to render in subd in Maya? I have seen alot of tutorials and they all render in subd, never in smooth polygon mode…? What is the difference?

Attachments

[joyster]

hm if you look at the zbrush maya intergration from digital tutors, they render out in polygon mode, they dont convert the mesh into subd…but all the other tutorials i have seen they convert into subd. What is the difference in quality? Why do some users prefer rendering out in polygon and some in subd, what is the best way. ? i get artifacts when i convert to subd, but not if i use the polygon.