The following motion blur settings are provided via Arnold Properties object modifier for geometry objects.

Transform Keys

The number of sub-steps used for motion blur can be set in the keys attribute within the Motion Blur settings. For situations where there is a direct movement, such as translation and rotation with constant speed, two keys are enough. However, if the object moves erratically during the exposure interval or performs any other kind of non-linear movement, you will need to increase the number of keys. 

Increasing the number of keys does not usually have much effect on rendering times, although it requires more memory to store the additional geometry at multiple times, especially for large polygon meshes. 

Below are examples where an increase in the number of keys is required. Notice that increasing the number of keys rounds off the corners of the spinning wheel:


The effect is more apparent when animating a deforming object along a motion path:

Keys 2 (default). Rollover image.

Keys 4 (rollover image).

Keys 8 (rollover image).

Deformation Keys

This option specifies whether motion blur will take into account geometry deformation. This should only be enabled when objects in the scene change shape quickly enough since this option uses more memory and renders slower. Adding motion blur to hair also requires Deformation Keys. It is enabled by default.

Deforming objects such as hair or grass require deformation motion blur

It cannot be used for objects with changing topology. In that case use Velocity blur (on the object motion blur properties).

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