I am taking baby steps with rendering Bifrost volumes in Arnold and have immediately fallen down on my face.
See the attached screen capture... major rendering errors here. Looks like the sort of thing that happens with bad settings for Step Size / Volume Padding.
However, I cannot find any settings for Step Size or Volume Padding in the bifShape node. I tried changing the settings in the source geometry mesh shape node that emits the volume, but it's not helping.
Viewport 2.0 looks fine. It's definitely an issue with Arnold. Looks like an epic fail, but maybe there's something I'm missing???
Caching to VDB didn't help.