Fullbright Texture Pack 1.12.2 No Optifine -

This method works because Minecraft reads a file called lightmap.png to determine how bright each light level should appear. By replacing this file with a fully bright white texture, the game renders all blocks at maximum brightness.

If you don't want to create the file yourself, here is a quick one-liner to generate the pack using Python (if you have it installed): fullbright texture pack 1.12.2 no optifine

import os, zipfile, struct
from PIL import Image
A "fullbright texture pack" for Minecraft 1.12.2 is a resource (texture) pack that makes in-game lighting appear as if blocks are fully lit regardless of actual light levels—useful for exploring caves, building, or recording without relying on shaders or OptiFine's fullbright settings. Because you specified "no OptiFine," this write-up focuses on solutions that work without OptiFine or mods that change lighting behavior. This method works because Minecraft reads a file