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Hey guys! I drive a car along a spline (tag) on a racetrack (with C4D car rig), with camera in the same chassis-group. I obviously want MB on the rotating tires and the background ... I added tags already .. but doesn't give any results ...u have ideas?

Take a look through the forum history. People run into the "motion blur issues with with camera in the same hierarchy as the car" pretty regularly. Chances are good that your situation has already been well addressed.

frankmci wrote:Take a look through the forum history. People run into the "motion blur issues with with camera in the same hierarchy as the car" pretty regularly. Chances are good that your situation has already been well addressed.

Ran into this issue many a time.

I have never been able to fix how it appears in the live viewer (always misaligned / vanishing), but on final render increase the 'Time Sampling Per Frame'. What was recommended to me was 5 (default is 1) but I found this to also produce errors so just made it 24 (matching the frame rate). You can find this in the Octane Render settings.

This then renders perfect every time, but again you obviously wont see this fix in the IPR as its an on render setting.

AaronWestwood wrote: Ran into this issue many a time.

I have never been able to fix how it appears in the live viewer (always misaligned / vanishing), but on final render increase the 'Time Sampling Per Frame'. What was recommended to me was 5 (default is 1) but I found this to also produce errors so just made it 24 (matching the frame rate). You can find this in the Octane Render settings.

This then renders perfect every time, but again you obviously wont see this fix in the IPR as its an on render setting.

Yes, the Octane Live Viewer is NOT designed to render motion blur accurately or reliably. Instead, it is optimized for the fastest feedback on texture and lighting modifications. As I understand it, the two are mutually incompatible. Only trust Picture Viewer renders when checking motion blur.

LV and PV is based on different data pipelines and infrastructures. Like real-time vs render time. Some data is not extractable in LV's interactive mode. You should see similar results when you resend the render on LV as PV, but later it will not give sub-frame data. Even it will work like caching as dynamics does.

Make a quick search on forums, I've repeately answered this question how to get correct results. Also manual is the another source for the questions.