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  • PointVelocity for linear transformation motion blur.
  • AngularVelocity for rotational motion blur. Note that this attribute does not come for free, you have to set it in the icetree as shown in the snapshot: get the rotation, subtract it from the one at the previous frame, and multiply it by the frame rate. This way you have the angular velocity (radians per second). Finally, set this data as Self.AngularVelocity.
  • StrandVelocity for linear deformation motion blur on strands.

 

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For cases where sub-frame motion blur is needed, you must enable Exact ICE Blur in the rendering options.If enabled, SItoA does not require the velocity attributes to be defined for points and strands. Instead, the pointcloud geometry is evaluated at all the motion blur times, so giving much better results. But there is a price to pay, since it requires evaluating the geometry several times, which can be quite expensive. And, there are two limitations:

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