SEUS PTGI Shaders Pack (1.21.7, 1.20.1) – Stunning Ray Tracing & Path Tracing Visuals

SEUS PTGI (Path Traced Global Illumination) is an experimental yet revolutionary shader pack developed by Sonic Ether, pushing the boundaries of Minecraft graphics by implementing a fully custom ray tracing engine – all without requiring an RTX graphics card. If you’ve ever dreamed of playing Minecraft with cutting-edge lighting and reflections, but don’t own high-end RTX hardware, SEUS PTGI is your answer.

This shader pack uses software-based ray tracing to simulate realistic lighting, shadows, and reflections. Every torch, moonbeam, or sunray feels natural and immersive. From the glow of lava to the subtle color shifts caused by indirect lighting, SEUS PTGI transforms the game’s visual atmosphere into something cinematic and alive.

While it’s still under development, SEUS PTGI has already become one of the most sought-after shader packs thanks to its ambitious goals and impressive results – even on mid-range NVIDIA GPUs.

Key Features

• Software-Based Ray Tracing Engine
  Delivers realistic global illumination, soft shadows, and reflective surfaces without needing RTX hardware. Works on most NVIDIA GPUs.
• Path Traced Global Illumination (PTGI)
  Accurately simulates how light bounces off surfaces, fills dark corners, and interacts with materials.
• Enhanced Lighting Atmosphere
  Replaces the flat yellow lighting of vanilla Minecraft with true-to-life light color – torchlight, moonlight, and sunlight all have distinct hues and behaviors.
• Detailed Shadows and Reflections
  Every object, no matter how small (like grass or flowers), casts detailed shadows based on the sun’s position. Reflective surfaces display accurate, real-time reflections.
• Beautiful Day/Night Cycle
  The sky and lighting change dynamically with realistic atmospheric effects, improving immersion in every biome and scenario.
• Dynamic Emissive Light Sources
  Fire, lava, glowstone, and torches emit light that interacts naturally with the environment with depth, warmth, and accurate diffusion.
• Fully Custom Shader Engine
  Built from scratch by Sonic Ether, independent from Minecraft’s vanilla lighting engine or external hardware dependencies.
• SEUS PTGI HRR Version (High Ray Reflections)
  A more advanced edition that includes high-fidelity reflections, sunlight simulation, and physically correct light behavior – recommended only for high-end systems due to performance demands.

Important Notes:

• AMD GPU support is currently limited or in development.
• Performance may vary on lower-end GPUs; recommended for NVIDIA cards with strong OpenGL support.
• Still in development, but already delivers exceptional results.

If you’re aiming to experience the full power of modern graphics in Minecraft without the need for RTX, SEUS PTGI is a groundbreaking option you shouldn’t miss.

Screenshots:

Recommended Settings for SEUS PTGI Shaders Pack

To ensure optimal performance and correct rendering when using SEUS PTGI, it’s important to configure your settings properly in OptiFine. Misconfigurations may result in lighting glitches or performance issues.

Required Mods

• OptiFine HD Ultra – Make sure you are using the latest compatible version with Minecraft 1.20.1 – 1.21.6.

In-Game Settings

Go to:
Options → Video Settings → Details

• Alternate Blocks: OFF
• Trees: Fancy or Fast ⚠️ Avoid using “Smart” as it may cause lighting issues.

Options → Video Settings → Quality

• Natural Textures: OFF

Options → Video Settings → Shaders Settings

• Shadow Quality: 1x
• Old Lighting: DEFAULT

Important Notes

• Custom Block Models in resource packs may cause lighting artifacts or bugs. If you encounter such issues, try disabling or replacing the resource pack.
• For best results, combine SEUS PTGI with simple resource packs that don’t override lighting or geometry.

Requires:

Optifine

Iris Shaders Mod (Optional)

How to install:

• Please visit the following link for full instructions: How To Download & Install Shaders with OptiFine