My cryptomatte is changing colors all the time

[ruuterdetuuter]

Hi,

I don't know how to fix this. But whenever using cryptomatte the color ID's are changing each frame.
Do any of you have had this kind of problem? If so, how can I fix this?

Using LW 2019.1.3 with Octane 2019 latest version

[ruuterdetuuter]

It happens to me when Update Material or scene reload is selected.

Could this be fixed?

[frankmci]

Not sure if it's the same issue you are describing, but there's this thread about Cryptomatte workflow that fixed a similar issue for me. The short answer: use the CryptoMaterialNodeName pass.

viewtopic.php?f=30&t=72828&start=10&hilit=cryptomatte

[juanjgon]

I suppose that this can happen indeed while rendering in full scene reload or while updated materials (due to the fact that to update the materials the plugin destroys/rebuilds them). I'm not sure how easy could be fixing something like that, that happens in the Octane core out of the plugin control.

Thanks,
-Juanjo

[ruuterdetuuter]

It would be worth fixing. There are numerous scenes that require an octane material update.
And that would render the cryptomatte useless..

Thanks though

[juanjgon]

What cryptomatte channels are you exporting? Can you send me your scene to reproduce this problem here to be sure that I'm investigating the same issue?

Thanks,
-Juanjo

[ruuterdetuuter]

I was exporting the Cryptomatte Material Node.
When using the Material Pin Name it keeps stabile.

But still it's interesting to look into.