Vfx in Dakar 18′, motion vectors text being used?

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Just released and very nice!
Everything done in UE4, except sand and dust VFX done in Houdini.

Last shot shows mad-maxesque sand storm, in slow motion.

Is that achieved using motion vectors [www.sidefx.com]?
My understanding was that with motion vectors you end up with an animated texture material which you apply to a 2d pane, but in the shot the camera is moving in the 3d space and seems not to reveal the (possible) two-dimensional quality of the sandstorm…

Or maybe, to reach the 3d appearance, they just populated a big cascade particle system with lots of motion vector textures as particles, like you would normally do with normal flipbook textures? Can you even do this?




cheers
Edited by Andr1 - Jan. 17, 2018 14:39:02
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I thought a lot of their stuff was pre-rendered. If that dust storm is realtime then it looks like a variety of smoke plume sims rendered as subUV textures and the placed in layers. It doesn't look slow motion to me. So that probably isn't any need for motion vectors.
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ah yes, that makes sense!
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