Activating Dreadlight Shaders in Iris or OptiFine

Selecting the Shader Pack

To enable Dreadlight Horror Atmosphere, launch Minecraft using your preferred shader loader (Iris or OptiFine). From the title screen or pause menu, open Options, select Video Settings, and navigate to the Shader Packs (or Shaders) menu. Locate Dreadlight Horror Atmosphere in the list of available packs, click it to select it, and confirm your choice by pressing Apply or Done.

Verifying the Atmosphere

Return to your world. You should immediately see the environment transform into a dark, horror-themed scene. The shader applies creeping fog, deep shadows, and an old-movie film grain across your screen. Because Dreadlight is fully compatible with both Iris and OptiFine, the visual change takes effect instantly without needing to restart your game client. If the world appears unchanged, reopen the shader menu to verify that shaders are toggled on in your video settings.