I am trying to figure out how to get a motion blur pass from Houdini to Nuke. Inside the material shader I have this set up as suggested by someone else on the forums (see attachment 1), which is exporting the motion parameter to mantra.

The Mantra render node is exporting the motion pass that it finds on the shader. This seems to be working properly. When I bring it into Nuke the motion blur works but breaks at a certain point, like I can't add more motion blur without it creating this ghosting effect.

Is this the best way to do motion blur in Nuke? I feel it's too expensive on this film I'm working on to do motion blur in render because of the drastic render times.

Thanks!

Is this the best way to do motion blur in Nuke? I feel it's too expensive on this film I'm working on to do motion blur in render because of the drastic render times.

Years ago this used to be the case, now its far easier to render motion blur in camera. using the old motion pass technique would in case look incorrect for certain shots in any case. So its not by any means a fix all solution.By drastic render times what are we talking ?

Rob

Awesome. Our render times spike when using Micropolygon PBR but it's actually quite incredible, the render times with motion blur in PBR are actually quite low. Almost the same as without Motion Blur, even when raising Geo Samples. I'm shocked.

Thanks!!!

You can observe how motion blur is created by turning on Sub-Pixel rendering in the IPR viewer

The samples simply spread out to fill out the ‘blur amount’- interactivly play with the Shutter Time in the Camera/Sampling tab to see it.