MotionBlur Pass

[Macha]

I know that it is possible to render a motionblur pass by exporting a variable calculated by getblurP vex. However, I think this always requires the blur to be a Geometry Velocity Blur.

Is it possible to render a motionblur pass with the other motionblur method: By setting the Geo Time Samples on the samples tab of mantra render node.

The reason why I ask is because I have something going through a CHOP and the v attributes cause the occasional weird blurring effect. Appending a trail sop instead does not solve the problem. On the other hand, rendering blur with Geo Time Samples is fine except that I can't render a separate motionblur pass (I need it for compositing in Nuke).

Edited October 8, 2010 by Macha

[Mzigaib]

Maybe you can use a motion vector pass to work with Reelsmart using the shader on the sidefx exchange site.

http://www.sidefx.com/index.php?option=com_wrapper&Itemid=152

I used it a lot with MR to get my motion blur done, I didn't test on Houdini thou.

I hope it helps.

[Macha]

Thanks Michel, but this shader is based on the same principle (getBlur vex) plus a fit vex.

I wonder if there is a hidden mantra parameter that lets me render Geo Time Samples blur as a motion vector pass.

[symek]

I know that it is possible to render a motionblur pass by exporting a variable calculated by getblurP vex. However, I think this always requires the blur to be a Geometry Velocity Blur.

I've never heard about this limitation. All kinds of mblur should produce output with getblurP(). Have you asked mantra to not actually blur the image (with "vm_imageblur" property)?

[Macha]

Hm, I'll have a look again. If you say it should work, maybe I've made a mistake during setup...