Hi,

Edit: This comment applies to ACES tone mapping and not to the ACES color pipeline.

First, this document contains essential information on the subject, so start by reading it: https://aximmetry.com/learn/virtual-production-workflow/setting-up-inputs-outputs-for-virtual-production/video/hdr-input-and-output/

In Unreal you will only need to set the Frame Buffer Pixel Format setting to Float RGBA and nothing else.

In Aximmetry, make sure that HDR is Active and set the Method to ACES:

Warmest regards,

Thanks, does this also mean that I need to enable HDR output in Windows & HDR in the LED processor?

@Eifert: What you’re describing isn’t really an ACES color pipeline. It’s just using a default ACES Tonemapper on the final output, which is something quite different. 

Hi,

Yes, you need to enable HDR output in Windows if you're using an HDMI connection and also enable HDR in the LED processor if it has such a setting.

@TwentyStudios, yes you are right. If you want the whole pipeline to be in ACES, you need to change the Working Color Space as described here: https://dev.epicgames.com/community/learning/courses/qEl/unreal-engine-technical-guide-to-linear-content-creation-pipeline-development/KJZk/unreal-engine-color-pipeline-opencolorio
However, I think this is only really necessary if your assets, such as textures, were created with ACES in mind. Otherwise, Unreal Engine renders in linear by default, which is sufficient to apply proper ACES tone mapping.

Warmest regards,

@Eifert, I would like to check if using the Unreal Working Color Space ACES pipeline, do we still need to setup the HDR with ACES as you describe in your earlier post? 

@Efiert: I hope you can research and implement a proper, full ACES pipeline (with proper documentation). ACES support includes applying color transforms to the camera signal itself, working in a unified color pipeline throughout. The Tonemapper is only the last step to bring the final output down to a more limited dynamic range for final viewing. You don’t have to prepare textures for ACES specifically, but if realism and predictability is important, it helps if the scene adheres to physically based, real world values overall. 

Hi,

@tanguanlong
While using HDR isn't mandatory, if you're dedicating the time to render with the ACES pipeline, you'll likely want to take advantage of the additional color range that HDR provides on the LED wall.
Also, as TwentyStudios pointed out, performing tone mapping with the ACES method and utilizing the ACES pipeline are two different things. It's not necessary to use the ACES method of tone mapping when utilizing the ACES pipeline in Unreal.

@TwentyStudios
We explored how to use ACES camera input (billboard) in Unreal. After switching to the ACES pipeline and enabling the OpenColorIO plugin, you'll need to edit the Aximmetry Camera blueprint. In the  Aximmetry Camera blueprint, after the Get Aximmetry Video node of the Billboard, you need to apply the ACES colorspace with the Apply Color Space Transform node—detailed instructions can be found here: https://dev.epicgames.com/documentation/en-us/unreal-engine/converting-colors-in-unreal-engine-blueprints
Note that this is only necessary for cameras with Billboards when using Allow Virtuals.

Warmest regards,