Hi Chris,
I am playing around with Blender & ACES 2.0 as the Blender 5.0 Alpha has direct support for ACES 2.0, next to Standard, Filmic and AgX. I found this out over this video:
Before I understand how ACES 2.0 will be implemented in Blender 5.0,
I was setting up a Blender scene in the release version 4.5.2 but with the official ACES 2.0 OCIOv2 config.
I basically re-used the scene from this article (Blender 4.5 & ACES 2.0 – Brylka – TooDee – PanicPost), but switched all the lights off and changed all the shader to emission shaders with the same values.
I rendered two images:
- working colorspace Lin-Rec.709, shader values at 0.900, view transform standard
- working colorspace ACEscg, shader values again at 0.900 (so intentionally a lot more intense “colors”), view transform ACES 2.0 SDR 100nit (Rec.709) - to make the images similar “bright” I raised the overall scene exposure by 1 1/3-stop.
So far so good or not good…
While I tried to find a similar exposure for the ACES 2.0 render to match more or less the first render, I noticed something in the reflection of the blue sphere.
And I wanted to ask you @ChrisBrejon if you can confirm the problem with your DCC app as well.
You made so many exposure sweeps, I guess you would have seen it too at some point.
It could be a glitch in Blender or my MacOS setup, but I see the same happening in Nuke with ACES 2.0 (rev.060 from the LUT bake version)
The reflection of the magenta sphere reflects as dark blue and at then it “flips” to a light blue/magenta.
I can share the .blend file if someone wants to try it too.
PS:
I remembered now a discussion in the ODT-VWG threads… and a plot… is the problem maybe related?
(the plot of the blue/yellow star image)
Update;
I tried again the same scene on a MBP with XDR display and here the blue does not flip as on the Mac Studio with Apple Studio Display. So there might be another problem with MacOS, Blender happening that I was not aware of.