Motion Vector passes are not working.
Version: 2018.1.3 / Octane Engine 17.9
Image renders out as flat grey.
If file exported to ORBX and rendered in stand alone, Motion Vector pass renders fine.
Other Issue:
My understanding is that for Motion Vector pass to work, Motion Blur must be enabled but does not render in final image. This is how it works in stand alone at least. However, the broken Motion Vector pass rendered in Octane Blender does show Motion Blur when there shouldn't be any. I am not sure if this is what is preventing the actual Motion Vectors from rendering?
Motion Vectors are also broken in Octane Blender v4 by the way.