If I make something in Blender with Filmic Blender. Save as asset, import it to Unity Game Engine... Wonder if the asset looks the same in Unity (with Filmic settings).
In other words, is Filmic only for Blender rendering?
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Filmic is only for rendering. It how the colours are saved to the rendered image. You should look into HDR rendering in Unity to get something similar.
Filmic is a library of color look-up-tables. It doesn't affect anything but output image data, and the display in the 3D view. Filmic affects the way Blender displays colors in images that are rendered, composited, or created with the video sequence editor. AFAIK it isn't possible to apply view transform to baked images, though, so if you'd like to apply Filmic view transform to your textures, load them into the compositor and save them to files.
It might also be possible to customize the lookup tables that your game engine uses, but that's a topic for their forum.