OTOY Forums

I'm having a problem with motion blur on a car tire moving about 45mph.
I have tested many different settings in Camera tag, Octane tags, time sampling frames etc.

When in have very simple geometry, the car tire spins and blurs smoothly.
When I turn off motion blur the complex geometry spins smoothly.
When I have complex geometry with motion blur the tire appears to bounce randomly.

I've been at this for 2 days with no real luck, so hopefully someone here can help me solve this.
3.05.3 and also tried 3.06

The car was rigged with the Drive! plugin, but the animation has been baked, so hopefully you won't need it to play the sample.


gif sample
https://gfycat.com/DarlingPerkyAnteater

Thank you!

select complex geometry, goto Menu->Mesh->Axis Center->"Center Axis to" should solve your problem

Thanks for the tip fuchsundvogel, but I've tested that setting many times.
As you can see in the "complex geometry w/o motion blur" clip there is no bounce.
This is the same geometry, so the axis is set correctly.

niestudio wrote:Thanks for the tip fuchsundvogel, but I've tested that setting many times.
As you can see in the "complex geometry w/o motion blur" clip there is no bounce.
This is the same geometry, so the axis is set correctly.

What fuchsundvogel say that's right. Move pivots to center of tire meshes. It will be fixed.

Hi Aoktar,
You and fuchsundvogel are indeed correct. I reset axis center on all geometry and it works fine.

I guess I incorrectly assumed that as long as the parent nulls had axis centered it would be alright.
Can you tell me why it was spinning properly without motion blur enabled, but when it was enabled, the weird behavior starts?

Thanks again fuchsundvogel!

niestudio wrote:Can you tell me why it was spinning properly without motion blur enabled, but when it was enabled, the weird behavior starts?

It's a technical problem on alghoritms of plugin while solving the motion matrices. I'll try to fix somehow.

Thanks Aoktar!