Chaos Corona for 3ds Max > [Max] General Discussion

3DSMax 2025 ACES and Corona Render

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Salvatore CDA:
Hi, maybe this question has been posted already but I didn't find an answer. Now ACES Colorspace is the defauld  on in 3DSMax 2025 So when I use Corona Render and the ACES OT is on by default as well, should I still use the Color settings from Max to Standard Gama 2,2, or can I turn the 3DSMax ACES Colorspace on ? what will happen? Will the ACES colorspace applied twice? Thanks for making it clear

Salvatore CDA:
Ok Maybe Im wrong but example:

In Cinema 4D and Redshift, when I turn on the Color Management OCIO in C4D, the Redshift OCIO turns off. When C4D is set to Linear, the Redshift Color OCIO turns on. all good

C4D/ and or Max and Corona Render, the Question from above stay. I think that Corona Render doesn't support ACES Color Space native. Is that correct? Is Corona Render still Gama 2.2 Linear Space?

Salvatore CDA:
OK, I get it.

If the DCC manages the Colorspace OCIO, don't use the Corona ACES OT. If you like to use the Corona ACES OT, which is on by default leave the DCC at Linear Colorspace

How do you work these days, With OCIO managed by DCC or with the Linear Colorspace and Corona ACES OT?

maru:
Here is the short answer:

This applies to both 3ds Max 2024 and 2025 with Corona 11 Hotfix 1:

- When using the legacy gamma 2.2 workflow - everything is straightforward. You can add the ACES OT operator to your tone mapping stack if you wish, pretty much like a LUT. It will make your image appear more "photographic". You can also remove the ACES OT operator. You do not have to add or remove any specific operators.

- When using the OCIO/ACES workflow - You need to add the new gamma correction operator to your tone mapping stack as the last operator. This is because we currently do not support displaying the image in the VFB correctly when using the 3ds Max OCIO/ACES workflow. If you don't apply the gamma correction operator, your image will appear with linear gamma in the VFB (it will look to dark). You can apply the ACES OT operator just like a LUT - it will make your image appear more "photographic".

Please note that the below is not yet fully decided, so I cannot provide you with very specific details:
We will soon release a Corona 11 Hotfix 2 which will support 3ds Max 2025 and will assume the ACES/OCIO workflow as the new default with some kind of automated or semi-automated way of correctly displaying the image in the VFB. We are not sure how exactly this will be done, but we will do it in the usual Corona style so that you don't have to worry about it. :)

Salvatore CDA:
thanks for the answer. I will stay with the Gamma 2.2 workflow until the next updates of the Corona Render

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