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Hi there, That's correct in Houdini 20.5 ACES is already built-in. You can find the settings under Edit → OCIO settings. There’s also an explanation there about how different files are interpreted. For example, if the filename contains ACEScg, it will be interpreted as ACES, but I’m not 100% sure about this — I thought it was reading that from the metadata. That’s probably why, since you exported an EXR, it’s being interpreted as Linear sRGB. Whenever I want to make sure a plate is in ACES, I export it from Resolve and choose ACEScg as the Output Transform. That way I know it’s ACES in all applications. I also include it in the filename and make sure it’s saved in the metadata. This works for me, but if someone has a better or more technically accurate explanation, I’d love to hear it. Cheers, Kamil

In this case easier make god rays in nuke

Alenbic have UVs, if animation the same as static geo just export alembic with uv

Try USD, FBX super old and weird

The simplest way I've been able to do this is by using UV Flatten to split the edge groups into separate islands (I call it uv2 or something to avoid overwriting existing uvs) Then subdivide. THEN use Group From Attribute Boundary, which looks at UVs by default. Change it to your custom uv2 channel.