Open Minecraft, navigate to Options > Video Settings > Shaders , and click Shaders Folder . Move the downloaded .zip file into this folder.
Requires OptiFine HD U H4 or newer for Minecraft 1.18.1. SONIC ETHER’S SHADERS 1.18 - SEUS
An experimental shader that uses software-based ray tracing to deliver realistic lighting and reflections without requiring an RTX-specific graphics card. Open Minecraft, navigate to Options > Video Settings
Select the SEUS pack from the in-game list to activate it. SONIC ETHER’S SHADERS 1.18 - SEUS