motionvector Arnold AOV is all black

[osukas]

Hello, Im new to Arnold and Im learning how to use AOVs

Im trying to get the motionvector pass, but is all in Black. I tried to move the exposure but is still empty.

There is a step im missing here?

[CiroCardoso3v]

I believe there is a bug. Jump to Arnold Answers to report it, as there you have direct contact with the Devs. I also need the motion vector working.

[Stephen.Blair · Accepted solution]

Yes, bug.

If I create a custom AOV, rename it to motionvector, set the type to RGB, and the filter to closest, I get motionvectors.

[CiroCardoso3v]

Thank you for the temporary solution, Stephen.

Although I need to test it in Nuke, as the tool will read vectors to create the motion blur.

[osukas]

Is working, Im seeing motion vector data. THANKS!

There is a way to have the motionvector data without having motion blur in the render?

In my PhysCamera I have to activate the motion blur to see it on the motionvector AOV, if I deactivate it, is all black

There is a way of getting your render with no motion blur but still getting motionvector data?

For the moment im reducing the shutter to 0.01

[CiroCardoso3v · Accepted solution]

On Diagnostics tab you can ignore motion. Never tried that, but I would start there. Also I am not sure if you need to have motion blur on the camera for the AOV to work. I guess that is the point of the motionvector, to avoid having to calculate motion blur.

[osukas]

It Worked!

THANKS!

[teamSP26J]

This cannot be real that I get this same bug in end of 2023 ..
Thanks for the solution but this is really sad.