Maya 2022 - aces cg OCIO 2 - Problems

[gustavo_ribeiro]

Hi Guys,

I am having a bunch of problem with using acescg.
First i am confused if i have to convert my srgb textures in nuke or photoshop or maya already does that convertion when i put the texture in the right color space?

For example:

For Color texture i am using: SRGB colour space

Should i use acesg for colour texture?Our should i convert this in nuke?

For roughness and bump i am using: Raw

Should i use other colour space?


My is looking really saturated when i put the display correction in ocio with the config.ocio as the same that is plugged in maya color manager.



Also the preview sample shows the texture much more dark than the what maya legacy was showing.

I am really lost on how to approach this. Can you guys help me with that?

Srgb was so much easier.

[beenyweenies]

For starters, the easiest way to set up ACEScg with Vray and Maya is to set it up in the "Color Management" tab in Maya's preferences. There, you can point to the ACEScg 1.2 OCIO config file on your computer, set the rendering space to ACEScg, and the view transform to sRGB. If you do this, then you don't need to change any other render settings (you DO need to set up the Frame Buffer though, see below) or worry about the color profiles of textures. Just make sure that any textures that aren't diffuse/albedo are set to RAW as you mentioned above. That's basically it.

In order to see the correct results in the Vray Frame Buffer, you have to set it up. From your screenshot, you are ALMOST there - you have to change the "Display Device" to ACES, and the "View Transform" to sRGB. I would also turn off the Filmic Tonemap, Hue/Sat and Exposure filters until you can confirm everything is set up correctly. Those are probably just confusing things even more.

There is a bit of a learning curve and it CAN be a little frustrating at first, but once you understand what's going on it's definitely worth your trouble.

[gustavo_ribeiro]

I am using maya 2022 and it has as default ocio 2.0. For the display device he doesnt show me a option for aces neither the view transform show a option for srgb. Should i download ocio 1.2?

[seq]

Hi Gustavo,

we use OCIO 2.0 with Maya 2022.1 and V-Ray 5.1 with no problem.

You don't need to convert your existing textures to any other color space, as you can't extend the existing color information in the image to get a broader color range. You just need to tell V-Ray how to interpret the images you use for texturing.

Attached are our settings for the Maya Color Management Preferences and the VFB settings. You also need to change the "Rendering color space" in the Render Settings to "From Maya Preferences" after you have set the Color space to OCIO in the Maya preferences. If you use the Linear workflow before, Rendering color space might still set to "Scene-linear Rec 709/sRGB".

Attached our OCIO config file, which is just a reduced version from the official 2.0 one. As always: No guarantee.

As beenyweenies said: It is worth the hassle.

Best,
Lars

[gustavo_ribeiro]

What is happening for me is that the default config of ocio 2.0 for maya 2022 doesnt show me ACESCG for the display neither srgb for the view.



Do you have an idea of why this is happening?

[seandunderdale]

I have wondered this too....why Maya default is ocio 2.0 and everyone seems to revert to 1.2? Default Maya 2022 aces seems a minefield!

[Muhammed_Hamed]

It is important to note that OCIO and ACES are not the same thing

The most recent ACES version is 1.2 , this is the official release
ACES 1.3 with features like Gamut Mapping is WIP, and has long way to go

Maya ships with OCIO V2.0 and WIP implementation of ACES (mostly based on ACES 1.2)
The problem here is that few applications adapted OCIO V2.0 ,hence many studios still use the official ACES 1.2 and OCIO V1.0

You don't lose anything using ACES 1.2 ,it actually saves you time and effort. One advantage is that you can customize the config file to your needs, specially the color picker

Best,

Muhammed

[gustavo_ribeiro]

So should i go with aces 1.2 and ocio 1.0?
I was wondering if nuke and davinci resolve have support for ocio v2.0?

I am having quite a hard time to understand everything.

[Muhammed_Hamed]

Yes stick to ACES 1.2 from the link in my post, Resolve are still on OCIO V1.0
Different story about Nuke, you can match OCIO 2.0

And here is a great article about ACES whenever you get a chance for reading

https://chrisbrejon.com/cg-cinematog...g-system-aces/

If you have questions let me know as well

Best,
Muhammed

[seandunderdale]

I have tried to find some official Autodesk info explaining the default switch in colour management, and how to manage it, and what to expect when you upgrade to 2022 but I didnt find anything....maybe it says more about my search skills. But such a fundamental shift in the way Maya works by default surely should have a pretty decent info dump upon opening the program after an install. How to make your renders look like 2020 Maya, how to setup textures, framebuffers etc. And this 2.0 vs 1.2 thing....why isnt this clearly explained by Autodesk? Its lucky for us that smarter people than me have worked it out and can share the knowledge.

[gustavo_ribeiro]

Hi muhammed i am having some textures that are looking with a lot of contrast and saturation when i am rendering them.

Do you have an ideia if this is right?

[Muhammed_Hamed]

I replied to your message, we can troubleshoot this here or in DMs

Will need screenshots of the renders and textures to be able to tell what is going on

Best,
Muhammed

[damaggio]

Here’s a new Autodesk video about color management

https://m.youtube.com/watch?v=bVYg8ZyljLs

[Muhammed_Hamed]

Thanks for sharing!

But note that color values in the scene that are above 1 simply get clipped by the display

This applies to the ACES ODT as well, it clips the data in a similar way.. The only difference is ACES tone mapping, compresses highlights and shadows and expands mid-tone contrast

And I don't know why they have other options for Rendering Space by default, the original ACES color space(AP0 primaries) is not meant for CGI rendering and will cause negative values(colors outside the visible spectrum of light)

[seq]

Thanks for your valuable explanation, Muhammed.

Here is another helpful website:

https://acescolorspace.com

Best,
Lars