, finding a "fullbright" solution that doesn't require Optifine is a bit tricky because that version of the game doesn't natively support the lightmap modifications used by modern texture packs.
In standard Minecraft, the engine calculates light levels based on proximity to light sources like torches, glowstone, or the sun. OptiFine overrides this by injecting custom code to alter the game's gamma settings beyond the default configuration menu limits. 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. , finding a "fullbright" solution that doesn't require