Sodium

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Fog transitions while underwater are not smoothly animated

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Bug Description

When a player enters an underwater environment, Minecraft performs the animation of adapting to visibility conditions. This effect basically consists of a smooth increase in brightness and distance to the edge of the fog:

[1.21.5 demo]
2025.June.23.00.32.mp4

(please, ignore the bug with fog occlusion)

This effect works without any noticeable issues in Minecraft 1.21.5 with Sodium 0.6.13, however in 1.21.6 the brightness level changes unevenly:

[1.21.6 demo]
2025.June.23.00.04.mp4
2025.June.23.00.07.mp4

Reproduction Steps

  1. Install Minecraft 1.21.6 (tested with Fabric Loader 0.16.14)
  2. Install Sodium 0.6.13 (also happens with 0.7.0 builds)
  3. Create and join a world
  4. Go underwater
  5. Avoid moving camera (you can do so to manually trigger the fog change)
  6. Observe the fog animation bug

Log & Crash Report

latest.log
crash-2025-06-23_00.48.06-client.txt

Additional

This bug also affects the new ground fog, but it's much easier to see and test it underwater.