I have simulated water with particles on maya and I converted these to a mesh thanks to besha openvdb nodes.

The thing is that I am using mtoa to render the water and I would like to add but motion blur but according to this workflow (Motion blur and meshes with changing topology), the velocity datas need to be written on the vertex color of the mesh, and I don't know how to do that..

I used BE_FromParticles and checked export velocity VDB but it doesn't help much. 

How can I write particles velocity to my mesh knowing that the topology is changing continuously ?

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Use Attribute transfer.
look velocity_mesh.ma
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I will try, thanks !
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