Location:
The Render Manager > (select a pass)
Set the current pass and choose Render > Render > Pass Options or Pass > Edit > Edit Current Pass from the Render toolbar.
Tab: Output
Options: Pass Motion Blur [Properties Reference]
To render the motion blur of objects in a scene, you must activate the motion blur settings for each render pass that requires blurring.
Set the Pass Renderer to mental ray (this is the default).
Enable Motion Blur for the pass.
The scene's motion blur settings are used automatically for the pass. If you want to override them for a specific pass, select Override Scene Render Options and modify the motion blur settings as described in Scene Motion Blur Settings.
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