Motion blur not working on meshed fluid sim

[Jim Meston]

Motion blur not working on meshed fluid sim.
I have velocity attrib but I am getting no motion blur and / or no RE velocity pass (well its rendering blank)...

Any help appreciated

[Gosho.Genchev]

Hey Jim,

Could you please check if the Geometry node -> Render -> Sampling -> Geometry Velocity Blur is set to "Velocity" ?

Best regards!

[Jim Meston]

How embarrassing

[Jim Meston]

One more question if I may...

How do you calculate what the max velocity or velocity range should be in the RE_velocity pass ??

it seems arbitrary or do you just save as 32bit and it just works?

[Gosho.Genchev]

Hey Jim,

Indeed, if you need to clamp it, I can't think of a way for us to handle this automagically - you'd need to set the Max Velocity manually.

Best regards!

[Jim Meston]

OK so if I am saving 16bit exrs how do I approach that setting? What are the units? Is it the magnitude of the vector as accessible in Houdinis geo spreadsheet?