Mental Ray problem

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  09 September 2013
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 September 2013 at 06:36 AM.
  09 September 2013
maybe convert to poly base meshes and subdivide them at rendertime?
  09 September 2013
Looking at it you wouldn't happen to be using mental ray displacement?
  09 September 2013
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.
  09 September 2013
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