Motion Blur and object offset

[Michael Plaengsken]

Hi
I'm on Vray 5 yet. I have an issue with a character who does an extrem bounce, I'm not able to render him in this extrem position, unless I turn Motionblur off. He is slightly behind, the point of Impact.
here you can see a side by side, the left side of the sliderline is rendered without Mblur, on the right side is the same frame with Mblur:

I rendered with this settings:


any ideas? Or Am I not understanding the system?
cheers
Michael

[Michael Plaengsken]

Add on:
Is it possible that this can be due to a scaled rig? It's a custom rig (not done by me). And to make it fit into the scene I scaled the master helper of the rig to 60% of its size.
I just linked a point helper to the COM-controller (center of mass) and collapsed its animation (via MB collapse, which unlinks the object and puts a key on each frame). While both object stay together over the whole animation, They have different animation curves! which i find interesting. I can only explain that with the COM living in a space, 40% smaller than the one of the pointhelper.
the circle is the COM, the cube ist the point helper:

any Ideas?

many thanks in advance
Michael

[Morbid Angel]

You may need more motion blur geo samples, try 4-6 with extreme motion this may be required.

[Joelaff]

Try a VRayCamera, and set the motion blur to 180deg with an offset of -90 deg. Also make sure your camera is not scaled. I don't think this affects motion blur, though, but it does mess up depth of field.