Update to commerce tone mapper #4614
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JL-Vidinoti
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Apr 22, 2024
* refactor environmentScene * commerce lighting is testable * removed commerce lighting * upgrade commerce tone mapper * added exposure compensation * revert example changes
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I've added a small contrast "toe" to the function, aligned to compensate for the average Fresnel deesaturation that occurs with PBR for dielectrics with the default IoR of 1.5. This makes it much easier to match glTF base colors to output colors, and fixes the desaturated, low contrast look of commerce as compared to ACES.
The commerce tone mapper has a meaningful exposure: with lighting [1,1,1], you get exactly the base color out (for most of the sRGB range). ACES has no such peg - it happens to be a bit brighter. For our 'neutral' and 'legacy' lighting, I've made an automatic exposure compensation, so that ACES and commerce tone mapping have the same "visual" exposure. If you're using your own lighting environment and want to compare tone mapping, use
exposure='1'for commerce andexposure='0.77'for ACES (or 1.3 and 1).