OTOY Forums

Hello!

I am having problems saving cryptomattes. When I look at the cryptomatte pass in render window everything seems fine. But once I save it I am getting just a green image. I tried in 2018.1.1 and 2018.1.2 . Tried in Standalone and tried it from Houdini. I might be setting something wrong in export settings. I am using 32bit exr , untonemapped (tried tonemapped as well). Tried multilayer exr and also separate passes. Nothing seems to work.. Can anyone share some settings that work? Thank you.

What are you previewing the green crypto pass in? You typically need a plugin to process the cryptomatte.

You can get the Nuke / Fusion ones here:
https://github.com/Psyop/Cryptomatte

and the After Effects one from here:
https://www.fnordware.com/OpenEXR/

(should be in the bundled ProEXR zip file you can download there)

Not sure if that's your issue, apologies if I'm just stating the obvious

Hi carmichael84,
thank you for the reply. Unfortunatelly I tried opening in Fusion and also in Photoshop with EXR- IO plugin. Both times they vere green. I am pretty sure that they would open fine if something wasn't wrong. But if anyone has a cryptomatte .exr I could try just to be sure I would love to try. I wasn't able to get my hands on any.

I am having the same problem. Octane 2018 in 3dsmax is just generating empty bright green data...... WFT

This is what I am getting as well

Ok figured it out and I cannot believe the answer.
You have to render a at MINIMUM number of samples which is equal to "bins" x "seed factor" for the cryptomatte data to show up and be valid.

So
rendered samples >= bins x seed factor.

If you are even 1 sample below it does not work.

For example if you want 4 bins of 15 samples per bin you have to render at least 60 samples for it to work.