How to get scene luminance/illumination at runtime ?

Development Rendering
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1

Hello UE4 community :slight_smile:

I am working on a realistic noise for my simulated camera and inside my noise formula I need to get the scene illumination/luminance, the same value used for eye adaptation/auto exposure.

Is there a way to get or calculate that value at runtime ? either in c++, blueprints or in shader editor please ?

This image shows the desired information to get :

328655-averageluminance.png
328655-averageluminance.png1170×326 224 KB

Thanks in advance for your help :slight_smile:

2 Likes
2

So after long researches in the source code, I think there is no possible way to get that value at runtime with the existing functions on Unreal Engine.
So I have modified the source code to add a new material node with the SceneAverageLuminance value as the result and now I can access the scene luminance inside material editor with a simple node.

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hello? how to do this?