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Arnold Volume + Motion Vectors

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I'm actually trying to export a motion vectors pass with arnold for a pyro simulation baked into a VDB.


I understand the concept behind the theory, which consist of getting pyro velocity matrix, camera inverted matrix, and multiplying them, but till now, I can't get to make it work.


There's an example involving Mantra who work quite well :



The problem with this example is that the nodes used (GetBlurP) doesn't have their equivalent in the Arnold shader.  I'm pretty sure I can do it with user data passed to the shader, but I can't figure it out.


Does anyone here have ever achieved this?  I would be very happy to hear about.





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