fix(unified-water): underwater fog flicker

[davo0411]

same fix as 245a433

Summary by CodeRabbit

• Bug Fixes
  • Improved underwater color attenuation and visual depth effects to enhance how colors blend in water environments.

[coderabbitai]

📝 Walkthrough

Walkthrough

Modified the underwater color attenuation calculation in the Water shader to use world-space distance from the origin (computed via length(WPosition.xyz)) instead of the W component of the world position vector, affecting how color depth is weighted beneath water.

Changes

Cohort / File(s)	Summary
Underwater Color Attenuation package/Shaders/Water.hlsl	Changed underwater color depth attenuation from using input.WPosition.w to length(input.WPosition.xyz) for distance-based weighting of diffuse and specular color components.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• #1772: Also replaces input.WPosition.w with length(input.WPosition.xyz) for distance attenuation calculations, applied to fog distance instead of underwater color.
• #1778: Modifies final color handling in the Water.hlsl pixel shader, specifically adjusting how the saturate clamping is applied to finalColor.

Suggested reviewers

• doodlum
• jiayev

Poem

🐰 A rabbit swims through waters deep,
Where distances are measured true,
From origin the lengths we keep,
For colors rich in every hue,
The W becomes a length anew! 💧

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(unified-water): underwater fog flicker' accurately describes the main change: fixing underwater fog flicker in the unified water shader by altering underwater color computation based on world-space distance instead of view-space depth.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

Using provided base ref: d4ee994
Using base ref: d4ee994
Base commit date: 2026-02-01T19:49:55-08:00 (Sunday, February 01, 2026 07:49 PM)
No actionable suggestions for changed features.

[github-actions]

✅ A pre-release build is available for this PR:
Download