MotionBlur on Pyro - How?

V-Ray for Houdini V-Ray for Houdini :: General
1

Hi,

I made a simple Pyro sim with Pyroburst and the SOP Pyro Node.In the export Tab of the Pyro Solver I covered all Volumes to VDBs.
I have not resampled the velocities.

The Fire and Smoke render fine in V-RAY 5 but I don’t find the right way to render MotionBlur on it.
Which are the correct steps for that?

I have a Physical Camera with MotionBlur enabled, long Shutter time and I also activated (like in Mantra) on the Geometry container “Velocity Blur”.

A vel vdb is available on my final node.

Do I miss something?

Thanks a lot

Helge

2

Hey @pixeltrain ,

Could you try cranking up the Motion Blur Multiplier on the Volume Grid Shader’s “Rendering” tab to see if that changes anything?
Off the top of my head, I can’t think of a reason for motion blur not to work based on the description of your setup.

Best regards!

3

@pixeltrain ,

Scratch that :slight_smile: The resulting velocity field is of type “vector” - we need 3 float fields instead. You could use a VDB Vector Split SOP to resolve this.

Best regards!

4

Thanks!

Good point, instead of using the “built-in” convert to vdb tick, I do it afterwards now with Convert VDB - and it works like expected!