Depending on the position offset of the motion blur in the global renderer settings (that specifies the shutter time interval of the whole scene), the instant value will be different. There you can set a value for the shutter_start and shutter_end attributes. To do this, select the camera and go to the Arnold section of the Attribute Editor. The reason being is that we don't want motion blur in the render but we still want the motion velocity information in our motion vector AOV. Prior to rendering the separated pool ball layer, you must se t an instantaneous shutter for the camera.We will render the pool ball (with Motion Vector AOV) separately and composite them together in a post processing program like Nuke.
Before we render the Motion Vector AOV, we must first separate the pool ball from the background.
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