Since this is for version 1.12.2, the installation process is slightly different than modern versions due to the differences in the Resource Pack folder structure.
Unlike OptiFine, which changes the mathematical gamma curve, a Fullbright texture pack literally replaces the lookup table the game uses to apply shadows. fullbright texture pack 1.12.2 no optifine
. This allows you to see clearly in total darkness—such as in caves, the Nether, or the End—without needing torches or the Night Vision effect. Key Features Maximum Visibility: Since this is for version 1