Motion Blur

User Motion

Instead of relying on Softimage to calculate motion vectors for blur, you can specify custom user motion vectors. You can use any vectors you want — in fact, you can blur an object even if it's not actually animated. User motion vectors can be useful in a variety of situations, especially with fast rotational movement or curved paths.

There are two ways to apply user motion vectors:

  • By applying User Motion cluster properties. With this technique, you must set the property values somehow, for example, by using a script, custom operator, or ICE.
  • Using ICE to set the PointUserMotion attribute.
If one or other of these exist on an object, it is used for motion blur instead of the object's animation.

For more information, see User Motion.