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I made a basic fire and smoke simulation in embergen and exported it as a vdb sequence (with the velocity data). When I put it into blender I get three velocity float values instead of one float vector value.

The problem is that I don't get any motion blur on this sim when I render it.

Any Idea how to get it right ? I tried using the vector pass to get the motion blur in the compositor but it doesn't seem to do anything, which doesn't surprise me that much ...

Ps : second screenshot is from a tutorial where it shows how my vector is supposed to look

enter image description here

enter image description here

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    $\begingroup$ Try to export the velocity as one single grid containing vector values, not individual floats for each direction (float vector means XYZ in one grid). Not sure whether there is a way combining the float values in blender though. $\endgroup$
    – brockmann
    Commented Mar 21, 2021 at 15:30
  • $\begingroup$ I merged them but it still does not work... $\endgroup$
    – Phönix 64
    Commented Jun 4, 2021 at 9:25

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The things that you're doing are probably correct (the second image) but motion blur with VDB files has been broken for a long time in Blender.

This was a report for liquids but it is the same for volumes:https://developer.blender.org/T78442

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