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Here is the generated content for a guide or resource page about creating or using a Fullbright texture pack for Minecraft 1.12.2 without OptiFine.
Contrary to popular belief, a texture pack (or resource pack) cannot normally change how light levels work. Light is calculated by the game engine, not by textures. fullbright texture pack 1.12.2 no optifine
However, a "Fullbright" pack for 1.12.2 exploits a specific feature: custom lightmaps. The lightmap is the gradient file that tells Minecraft how to color blocks based on light level. A standard lightmap goes from black (0% light) to bright white (100% light). Here is the generated content for a guide
A Fullbright texture pack replaces that standard gradient. Instead of darkening at low light levels, the custom lightmap forces every light level (from 0 to 15) to display as maximum brightness. In essence, your screen never gets dark, even in a sealed cave at Y=11. What Exactly is a Fullbright Texture Pack
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):
import os, zipfile, struct
from PIL import Image
Step 4: Apply and Enjoy
Click Done. Minecraft will reload the textures. Once the game reloads, you will notice that dark caves are now perfectly visible, and night time looks almost as bright as day, minus the sun.