Sky/SkyMesh: Remove legacy gamma correction curve. #32677
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Related issue: #32325
Description
Removed the adaptive gamma curve that was applied before tonemapping. The shaders now output linear values, letting the renderer's tonemapping and color space conversion handle the display transform correctly.
This curve was a legacy artifact from before Three.js had proper color management. Applying it before tonemapping meant the tonemapper was operating on non-linear data.
(Made with Claude Opus 4.5)