1.21.9 changed the lightmap shader, and now block light is strangely warm/orange. this fixes that. Lightmap Fixer is a vanilla like pack from owenxm. It targets medium-tier hardware and up and runs through Iris or OptiFine on Minecraft 1.21.9 – 1.21.11. Licensed MIT, so the download is mirrored right here on MineSpecs — no ads, no redirects.

How to install Lightmap Fixer

1. 1Install a shader loader for Minecraft 1.21.9 – 1.21.11 — Iris (pairs with Sodium) or OptiFine.Lightmap Fixer is a shaderpack, so it needs a loader to run.
2. 2Download the Lightmap Fixer .zip from the button above — keep it zipped. It is mirrored on MineSpecs, so there is no ad-gate or redirect.
3. 3Drop the .zip into your .minecraft/shaderpacks folder (%appdata%\.minecraft\shaderpacks on Windows, ~/Library/Application Support/minecraft/shaderpacks on macOS).
4. 4Launch the game, open Options → Video Settings → Shaders, and select Lightmap Fixer.

Performance & what to expect

Lightmap Fixer is rated medium performance impact. It wants a mid-range dedicated GPU. Drop render distance a few chunks if you fall below 60 FPS. The look is vanilla like.

More vanilla like shaders

BVS — Best Vanilla ShaderLow impact · by LoLip_pMiniature ShaderPotato impact · by ukrechVanillAAPotato impact · by vriskaEclipseMedium impact · by gamerbenytEpochPotato impact · by WoMspaceDaybreak ShaderPotato impact · by agentclone8

Lightmap Fixer is created by owenxm and mirrored here under its MIT licence. MineSpecs is an unofficial fan project and is not affiliated with owenxm, Mojang Studios or Microsoft.