Because Minecraft does not load shader packs natively, you must activate VividVanilla Shaders through a shader mod such as Iris or OptiFine.
Selecting the Shader Pack
1. Launch Minecraft with your shader loader profile active and load into the main menu or an existing world.
2. Press Esc to open the pause menu, then click Options and select Video Settings.
3. Open the Shader Packs (Iris) or Shaders (OptiFine) menu.
4. Locate VividVanilla Shaders in the list. If it does not appear, click the button to open your shaderpacks folder and verify the archive or folder is placed directly inside it without being nested inside an extra subfolder.
5.
Confirming It Works
Once you return to your world, check the sky, terrain, and nearby blocks. You should immediately notice richer, more saturated colors, sharper standard visuals, and brighter overall lighting, while block outlines and the classic vanilla style remain free of heavy visual clutter.