SpectraDrox Ultra requires an active shader loader such as Iris or OptiFine to run inside your client. Once the pack is in your shaderpacks folder, you can turn it on directly from the pause menu without restarting Minecraft.
Selecting the Shader Pack
1. Load into a world or stay on the title screen, then open Options and click Video Settings.
2. Open the Shaders or Shader Packs menu provided by your shader loader.
3. Click SpectraDrox Ultra Shaders in the list and select Done or Apply so the game reloads rendering.
4. Check your vanilla Brightness slider in Video Settings and keep it at a comfortable middle or bright setting so it complements the pack's balanced contrast.
Confirming the Visual Changes
Enter an Overworld biome during clear daytime to verify everything loaded properly. Look up at the sky and across nearby grass and water—the vanilla biome color palette should look fresh and vibrant rather than flat. Check underneath trees and player-built structures; you should see soft, refreshed shadows resting across the terrain without dark visual clutter on your screen, while default block textures retain their classic, natural look under bright sunlight.