Hi,
I added OCIO in blender, my RGBA render is perfect when I open the exr in Nuke but the color passe are completly satureted.
This is the render in Blender and the render in Nuke (both are matching)
I quickly checked on my side with a simple scene. I don’t experience your problem.
Would you be so kind and setup a simple test scene and send some more screenshots?
to the Nuke setup:
You need to set the colorspace for a non-color render pass to “utility-raw”. ACEScc is not the right choice, as this is a log encoding for grading applications.
I took another scene (from the Blender & ACES setup article and rendered a multipass EXR and loaded it into Nuke. I still can’t replicate your problem.
Did you figured it out yet?