SEUS PTGI

Path-traced global illumination for Minecraft. The most demanding shader pack on this list by a wide margin. Requires a modern dedicated GPU for playable frame rates. Distributed by Sonic Ether. A modified edition (GFME) exists but requires the original file to build .

Quick facts

CategoryPath-traced / Realistic
LoaderOptiFine, Iris (via GFME)
AuthorSonic Ether
Sourcesonicether.com / Patreon
DistributionOriginal requires creator's page
HardwareHigh-end GPU only

Source status

Restricted distribution

SEUS PTGI's license prohibits direct redistribution of its code. The original file is distributed by Sonic Ether. We link to the creator's page where available. Metadata last checked October 2026.

Visit creator page →

Opens sonicether.com in a new tab. Creator's terms apply.

What SEUS PTGI does

SEUS PTGI (Path Traced Global Illumination) uses path tracing to simulate how light bounces around the world. Unlike rasterized shaders that approximate lighting, PTGI traces individual light rays. The result is accurate reflections, soft shadows, and colored light bounce that other shaders cannot replicate.

The tradeoff is performance. PTGI is significantly more demanding than BSL, Complementary, or Photon. On hardware without a modern dedicated GPU, frame rates will be unplayable [citation:13].

What makes it different

  • Path-traced global illumination — light bounces accurately, colors bleed onto nearby surfaces.
  • Off-screen reflections — water reflects objects that are not currently visible on screen.
  • Metal sunlight caustics — in the GFME modified edition .
  • PBR support — works with PBR resource packs for parallax and specular mapping [citation:13].

Hardware requirements

SEUS PTGI requires a dedicated GPU. Integrated graphics will not run it at playable frame rates. The GFME modified edition notes compatibility with Iris 1.7.0+ and OptiFine above Minecraft 1.8.9 (released after April 2019) .

For 1080p gameplay, expect to need a GPU with at least 6 GB of VRAM for light packs, and 8+ GB for PTGI at playable settings [citation:13].

Installation (GFME modified edition)

The GFME edition is a modified version that works with Iris. Because PTGI's EULA prohibits direct redistribution, you must build it yourself :

  1. Download the GFME jar from its GitHub releases page.
  2. Download a vanilla unedited PTGI file from Sonic Ether's Patreon.
  3. Place both files in the same folder and run the jar.
  4. Move the resulting folder or zip into .minecraft/shaderpacks.
Do not redistribute: PTGI's license prohibits sharing the extracted files. Build it for your own use. Do not upload it to file-sharing sites.

Frequently asked questions

Can I run SEUS PTGI on a GTX 1650?
Technically yes, but frame rates will be low. PTGI is path-traced and designed for modern GPUs. A GTX 1650 may reach 30 FPS at 1080p with reduced settings, depending on the scene. A mid-range GPU like an RTX 3060 or better is recommended for playable frame rates.
Is SEUS PTGI free?
The original is distributed by Sonic Ether, historically through Patreon. The GFME modified edition is free but requires you to obtain the original file first .
Does PTGI work with Iris?
The GFME modified edition supports Iris 1.7.0 and above. The original PTGI was built for OptiFine .

Related shaders

Bliss Shader

Cinematic alternative. Less demanding than PTGI.

BSL Shaders

Mid-range alternative with strong lighting.

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