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Old 09-01-2013, 06:32 AM   #1
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Mental Ray problem

I created some ropes by drawing curves and extruding along them. So the ropes are NURBS surfaces. The problem I'm getting is that when rendering in MR the ropes are a bit offset compared to their actual positions inside maya.

A couple of shots to illustrate the problem::

As you can see inside maya the horizontal sections are aligned with the vertical ropes but in MR the horizontal sections are floating in mid-air.

Also for comparison, the same shot in Maya hardware renderer:

Any help is appreciated.

Last edited by Universalis : 09-01-2013 at 06:36 AM.
Old 09-01-2013, 09:30 PM   #2
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maybe convert to poly base meshes and subdivide them at rendertime?
Old 09-06-2013, 01:19 PM   #3
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Looking at it you wouldn't happen to be using mental ray displacement?
Old 09-07-2013, 06:58 AM   #4
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Thank you both for the help.

I figured it out. I noticed this problem appears only on the long ropes. You can see in the renders above the short ropes are rendering normally. I solved it by turning on advanced tesselation and use chord height for the ropes that have the problem. Then MR rendered them properly. But then I figured this would require more processing time for calculations during render time so I converted the problematic ropes to polys.
Old 09-07-2013, 06:58 AM   #5
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