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Calculating volume velocity for motion blur (Karma)


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Hiya - short version of this is that I've got a scene with deforming volumes (clouds) using volume deform along a series of curves etc, and want to render in Karma (XPU). All works fine the renders are pretty and very quick but motion blur is missing on the volumes - I'm assuming I need some velocity info on the volume.

So basically I'm looking for a sort of Trails sop, to calculate velocity, but for volumes, or maybe there's another simpler solution?

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