Procedural does not render motion blur for SkelAnimation

[xsisupport]

Describe the bug
Arnold usd procedural does not render motion blur for SkelAnimation. Render delegate in Solaris does.

To Reproduce
Steps to reproduce the behavior:

1. In Maya, load agent.usda with an aiStandIn.
2. Render.
3. No motion blur. The first and last frames look to have some blur, but all the frames in-between have no blur.

Changing frames while the ARV is running crashes Maya. CERs point to usd_proc.

Also, USD for Maya does not render motion blur. Create a stage from file, and render that with Arnold. No blur.

Expected behavior
Motion blur, as in Solaris with the Arnold Render Delegate.

Used Software Versions

• Latest Arnold

[autodesk-oss-arnold-bot]

Issue synced internally to ARNOLD-14539

[cpichard]

Hi, the motion blur will depend on the shutter_open and shutter_close parameter of the camera. I am guessing the default maya perspective camera doesn't have shutter_open and shutter_close set, that would explain why there is no motion blur.
However I can confirm it crashes in the arnold viewport when changing the frame.

[cpichard]

Hi,
with the patch which fixes the crash #1830, I can see the motion blur but only if it is enabled in the render settings :

Could you double check on your end ?

Thanks !