Cryptomatte

[corestudio]

It's been a while since I used Cryptomattes in v-ray Houdini and Nuke. V-ray seems to render the passes, but as soon as I drop down a Cryptomatte node in nuke 13 (the built-in crypto matte) I'm unable to pick the mattes. It just goes black. A trick or something obvious I'm missing? Thanks

[Dubbie99]

Check that you haven't got the old cryptomatte still loading as well. They seem to clash and break things.

[corestudio]

thanks, yeah we've been through that slog as well. Unfortunately we also tried on a virgin nuke install. same behavior.

[corestudio]

yeah, redshift crypto mattes work fine. something strange with the v-ray ones

[chakarov]

Cryptomatte seems to work on my side.
Can you share some more info, Houdini,OS and V-Ray versions? Is it Solaris ? May be a hip file?

[corestudio]

Hi Georgy. Thanks, here's a .zip with a .hip and a .nk file. v-ray generates a cryptomatte, but I'm not able to pick the mattes in nuke. Windows.

Houdini 19.0.531
v-ray 5.20.20
Nuke 13.1

[chakarov]

It's the output file name pattern, if you have "$AOV" tag in it V-Ray will save every channel in separate file The problem is that every cryptomatte layer is saved in a separate file and I think there is no working solution to combine them in a useful way. So you just need to remove $AOV tag from filename and V-Ray will save all the elements in a single file and the cryptomatte will work in nuke.

[corestudio]

aha! I guess I never noticed that $AOV was part of the default output field in the v-ray ROP. Has it always been? Interesting. Anyway, thanks! Works perfectly.