Fix Fullbright Texture Pack 1.12.2 No Optifine -

See perfectly in caves, underwater, and the Nether.

You need a pack specifically designed for the "No OptiFine" method. Popular choices often have names like "Fullbright.zip" or "No-Optifine-Fullbright." fullbright texture pack 1.12.2 no optifine

Inside the root of the zip folder, create a pack.mcmeta file using a text editor. Paste the following: See perfectly in caves, underwater, and the Nether