Cryptomatte // sometimes render just one frame of animation on batch rendering

[Tete]

Hello,

On a recent project we did we used a lot cryptomatte and sometimes when we batch rendered the cryptomatte Render Layer had just the first frame rendered in the sequence.

The workflow was to create a render layer with just the cryptomatte Render element on, distributed rendering disabled (with layer override), saved as exr multichannel.
Rerendering it worked in the end but it's a bit annoying.
We got this issue on multiple scenes. Is that a know issue?

My guess is that we have other render layers in the same scene with distributed rendering on - it's disabled for the cryptomatte Render Layer with an override - but maybe that's what is causing the trouble ?

Maya 2016 Vray 3.60.04 Windows 10

Thanks

[yolov]

That doesn't sound right at all. We have not had any previous reports for such a problem.
Can you give us a bit more detail on the setup?
You have a render layer where you only render the cryptomatte, is that correct?
And for that render layer you don't use DR, but you do for the other layers?

[Tete]

Yes that's exactly it.

Actually in the first place I wasn't disabling the distributed rendering but when I got this problem I thought it was related to distributed rendering, but it appears it might not.

The reason I'm having a render layer only for the cryptomatte is because we don't use multi channel exr for the rest of the render layers. (so there is also a layer override on the file type, from exr to exr multichannel).
On the Crypto Render Layer I also disable GI/lighs/maps/reflection/glossy effects/sss with an RL override in the override setting panel. And I disable all the other RE.

That's all the details I can think of, I'm trying replicate it with a scene but so far it seems to work, this happened a bit randomly.
I Will post a scene if I got this again. Thanks

[yolov]

Right, thanks for the info.
Well, do let us know when there's a repro case and we'll look into it.