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 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 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.