now dont get me wrong, this is far from perfect, but this is possibly one of the FIRST EVER successful attempts at a fully raytraced minecraft shader made only with chatGPT. ai is getting way too smart.

it features: RAYTRACED SHADOWS, WORLD-SPACE REFLECTIONS, COLOURED BLOCK LIGHTING, LIGHT BOUNCES, AND CASTING SHADOWS FROM BLOCK LIGHT.

GPT_RT v1.zip

MC 1.21.8, OptiFine, Iris, 1.21.9-snapshot, 1.21.9, 1.21.10, 1.21.11-snapshot, 1.21.11, 26.1, 26.1.1, 26.1.2, 26.2

Release 2026-08-29 Get

Requirements & install

How to use this shader in Minecraft

Shader loader: Iris OptiFine
Minecraft: 1.21.9 – 26.2
Install folder: .minecraft/shaderpacks

How to install shaders

Install a shader loader for your Minecraft version: Iris (with Sodium) or OptiFine.
Download the shader pack .zip file (do not extract it).
Put the .zip into the shaderpacks folder (.minecraft/shaderpacks).
In game open Options → Video Settings → Shader Packs, select the pack and apply it.

Browse more: Iris shaders OptiFine shaders Shaders for 26.2 All shaders

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Latest Release

Version

1.21.8, OptiFine, Iris, 1.21.9-snapshot, 1.21.9, 1.21.10, 1.21.11-snapshot, 1.21.11, 26.1, 26.1.1, 26.1.2, 26.2

Download Latest

Details

Loaders

OptiFine Iris

Minecraft Versions

MC 26.2 MC 26.1.2 MC 26.1.1 MC 26.1 MC 1.21.11 MC 1.21.11-snapshot MC 1.21.10 MC 1.21.9

Add a badge to your pageLink to GPT_RT from a README, website or forum post.

<a href="https://mineuniverse.net/shader/gpt-rt"><img src="https://mineuniverse.net/api/project-badge/gpt-rt.svg" alt="GPT_RT on MineUniverse" width="206" height="54"></a>

Badges update automatically and link to the shader page on MineUniverse.

GPT_RT

Requirements & install

How to install shaders

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