Troubleshoot final gather causes flicker

 
 
 

If you are rendering a scene with final gather and the lighting flickers, follow these steps:

  1. Enable the Optimize for Animations option under the Final Gathering Tracing section, Final Gathering Tracing subsection in the Indirect Lighting tab of the Render Settings: mental ray tabs. The Optimize for Animations option sets the final gather mode to multiframe.

    See Render Settings: mental ray tabs for more information.

  2. Set the Render Mode to render final gather maps using this command:
    setAttr mentalrayGlobals.renderMode 3;
    
  3. Set the scene to render a representative subset of frames or a coarse version of the animation.
  4. Set Rebuild to Freeze under the Final Gathering Map section of the Indirect Lighting tab of the Render Settings: mental ray tabs.
  5. Set Render Mode to full render using this command:
    setAttr mentalrayGlobals.renderMode 0;
    
  6. Fully render the scene.
    Note

    While this workflow avoids flicker, some parts of the scene may still suffer in quality if an insufficient number of final gather points is found.

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