• Maxon Cinema 4D

  Is there a way to exclude part of a mesh from ambient occlusion ?

  Posted by Monika Zidaell on March 8, 2012 at 8:09 am

  Hi,
  I made a character in c4d, everything looked ok until i rotated some parts of the body and render it. The mesh on some parts of the model looks like its triangulated, thou its not ( and its visible). I noticed it is related with the ambient occlusion filter, when its on it shows this problem. Is there a way to sort it out?
  Thanks

  Adam Trachtenberg replied 14 years, 4 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Adam Trachtenberg

  March 8, 2012 at 3:36 pm

  You’ve got a couple possibilities:

  1. Use the AO shader in your materials’ diffuse channel instead of using the post effect. Then you can apply it wherever you want;

  2. Use the post effect, but give the problem geometry a compositing tag and uncheck the “seen by rays” box. That will prevent the AO effect from seeing the geometry, but may be a problem if the object has to be seen through refraction, or if you want the effect applied to parts of the mesh but not others.
• 

  Monika Zidaell

  March 9, 2012 at 10:55 am

  Hello,

  Thanks, it works. I managed to apply AO to each material except the one that was causing the problem, however i have another issue. I have a hair object and since i cant use the AO in the post effects i have to find a way to make it work other way. I tried to find some answers online but without success :(.

  Is there a way to apply AO to a hair material?
• 

  Adam Trachtenberg

  March 9, 2012 at 4:24 pm

  I don’t think it’s possible unless you set the hair object to generate geometry (Hair Object>Generate>Type:). In that case you can place a regular material on the hair object. The down side is that lose the shading options from the hair material.

  In any case, I don’t think the AO post effect does anything with hair unless you generate geometry, too.

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