A: Generally, no. Most servers and anti-cheat systems see client-side visual changes like FullBright as acceptable because they don't provide a major competitive advantage. However, it's always good practice to check a server's specific rules before use.
Ensure you are running Minecraft 1.12.2 with OptiFine installed. 2. Move the File to Your Game minecraft 1.12.2 fullbright texture pack
Instead of a texture pack, you can manually set gamma in 1.12.2 via : gamma: 100.0 This requires closing Minecraft, editing the file, then setting file to read-only (otherwise game resets it to 1.0 on launch). Works perfectly without mods or packs. A: Generally, no
A: Possibly. While it’s not X-ray, automated anti-cheat systems sometimes detect abnormal lightmap data. Use only on servers that explicitly allow visual modifications. editing the file