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I have deforming geometry that we need to apply motion blur to, but I get the error above in the title and the motion blur isn't rendering properly, even with the motionvector aov. We don't have access to the velocity color set for the vertices, all we have is the alembic cache. Is there any work-around to this?
Got the exact same error, but also with 'number of vertices changed between motion steps'. Anyone?