Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: piotrus3333 on 2025-05-02, 10:55:45

Title: Is this behaviour expected in colour managed 3dsMax versions?
Post by: piotrus3333 on 2025-05-02, 10:55:45

max 2024 default ocio config, Corona 12 hf2:

after changing colour management settings to Rendering Color Space: scene-linear rec 709-sRGB Corona locks Internal color space in Development/experimental stuff to sRGB (linear rec 709).
is this behaviour expected and as designed or should it be considered a bug?
as from the very beginning internal rendering math in Corona was always performed in at least Adobe wide RGB space this might lead to some users switching from 3dsMax default ACEScg to scene-linear rec 709-sRGB, expecting legacy-like (gamma 2.2) setup but in fact limiting Corona to pre-Corona, 2011 VRay's colour math with all its lighting bugs and limitations.

Title: Re: Is this behaviour expected in colour managed 3dsMax versions?
Post by: maru on 2025-05-23, 09:54:23

Hi, I checked with the devs and this is because we try to match the Corona color space to what is selected in 3ds Max, and if no match is found, we fall back to sRGB. I understand that you would still like to be able to override it. We will see if this can be done. This is now logged as (Report ID=CMAX-1659).

Meanwhile, I think you can hack it by running this script renderers.current.colorSpace = 2
No idea if it works as expected though.