Maya Motion Vector Pass

[avajjon]

Hello,

I haven't been able to output a vector pass for any scene I tried. (eg. Simple moving sphere) All I get is a grey image.

Could someone please tell me how to make it work ?

Thanks.

[pixerati2]

Second this - is it broken or are we missing some magic setting?

[stratified]

The motion vector pass can contain negative values, which means that it only makes sense to export it in OpenEXR format. Have you tried this and inspected the values because I guess negative values will be displayed as gray.

cheers,
Thomas

[avajjon]

Yes, I have rendered as EXR files, vector file is emty, checked the file with notepad and it contains no data.

Thanks

[JimStar]

You need the motion vector data to be assigned to a mesh (using standard Maya's way) to get it rendered.

[pixerati2]

Does someone mind explaining how to assign motion vectors in Maya? I've always done it through Mental Ray shaders and as much as I Google I can't stumble across any standard method...

[pixerati2]

So I'm guessing the silence means no one else knows how to do it outside of mental ray either...?

[avajjon]

Mesh converted from liquids such as realflow or maya bifrost get it, other than that I couldn't find any info either.

[jangwee]

So has anyone ever figured this one out?
This old thread was never got with satisfactory answer.
What exactly do we have to do to get a motion vector pass out of Octane and what will it work with?
I also only ever get flat mid-grey renders.
ie. - is the motion vector data compatible with RSMB or other motion blur plugins for post?

[Refracty]

was running into the same problem

Could you (Kai or JimStar) provide us (Users) with a detailed workflow description.

Thanks