Anton Moss

Doudini
in H16 sidefx added the polypath SOP which can do this now. check inside the sop for how it works.

7 years later and this is the winning solution for consolidating multiple curves. Thanks!

It's worth mentioning that enabling "Legacy EXR Mode" is not ideal, particularly if using Nuke. I say Nuke because Fusion may be using an older OpenExr version than 2.0. I couldn't find any info regarding Fusion's exr version. Anyway, with Legacy EXR Mode enabled, you'll no longer have access to the Multipart feature in the newer builds of OpenExr(2.0+). Multipart allows software packages to access individual parts without the need to read other parts in the file.

From the docs - https://www.sidefx.com/docs/houdini/nodes/out/usdrender.html [www.sidefx.com]:
Enable Legacy EXR Mode
When saving OpenEXR images with multiple AOVs, husk will normally save the images using multi-part EXR files. This extension (introduced in 2013) lets programs read a single AOV without having to read the entire image. This allows most software to work much more efficiently.
Some applications have not transitioned to support multi-part images. If your pipeline uses software that doesn’t support OpenEXR v2.0, this option will force husk to write out images in an inefficient, but more compatible format.

Helpful explanation to anyone using Fusion:
https://bryanray.name/2022/06/04/karma-cryptomatte-and-fusion/ [bryanray.name]

tamte

Anton81
Usd Render ROP>Driver>Render Command
husk --exrmode 0

or as a shortcut

USD Render ROP and USD Render ROP LOP -> Husk -> Rendering -> Enable Legacy EXR Mode checkbox
Karma ROP -> Advanced -> Driver -> Enable Legacy EXR Mode checkbox

Oh yeah, that's great, it's right there staring at me: