I'm having trouble getting Vector Motion Blur. It doesn't show up in render. I have a position, rotation and PBlurp morph animation in my scene. I enable Vector Motion Blur in the Render Settings. I add a Motion Blur tag for each animated object and for the Particle Geometry object, to blur the PBlurp morph too. And nothing changes in render. No effect.
How to set it up properly?
By the way, I particularly want to try VMB, as the Sub-Frame Motion Blur and Physical Render Motion Blur take too long to render.