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To enable native rendering of the Hair and Fur modifier, in the Environment and Effects dialog under the Effects tab, select the mr prim option for the Hairs parameter in the Hair and Fur rollout:
In order to render the hair geometry with three-dimensional motion blur, set the motion blur mode for the hair source to Object in the Object Properties window:
Note: The duration and position of the motion blur interval for the Hair and Fur effect are controlled from the Hair and Fur render effect, rather than from the respective V-Ray settings.
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