iterationT

iterationT at a glance

Author	Null
Shader version	v1.1.0
Minecraft versions	1.19.4 - 1.21.5
Mod loader	Iris
Category	Realistic
Performance	Demanding
FPS impact	-55%
Minimum graphics card	GTX 1070
Recommended graphics card	RTX 3060

Download iterationT

Description

iterationT is a shader focused on realistic lighting, with voxel-based path tracing. Every light-emitting block lights up its surroundings with realistic, colored light, calculated by tracing rays through full 3D space. The shader is actively developed and has one of the best voxel-based global illumination (GI) implementations available on Iris. It's heavier than most shaders, but lighter than SEUS PTGI. For comfortable play, it needs a GTX 1070-class graphics card or better.

Highlights

• Path tracing on Iris
• Voxel-based 3D lighting
• Lighter than SEUS PTGI

Features and graphical effects

iterationT adds the following graphical effects that transform how Minecraft looks:

• Voxel path tracing
• Colored 3D lighting
• Dynamic shadows
• Volumetric clouds
• Realistic water
• Bloom
• TAA

Hardware requirements

iterationT falls into the demanding performance tier. Its estimated FPS impact is -55% compared to vanilla Minecraft.

Parameter	Value
Minimum graphics card	GTX 1070
Recommended graphics card	RTX 3060
FPS impact	-55%
Mod loader	Iris

If your FPS drops below 30, lower your render distance to 8 chunks and turn off volumetric clouds in the shader settings. You'll find more tips in our shader guide.

How to install iterationT

1. Make sure you have Iris Shaders (Fabric + Iris) installed. For step-by-step instructions, see Iris Shaders.
2. Download iterationT from the official site. The file is a .zip archive.
3. Don't unzip the archive. Copy the whole .zip file into the .minecraft/shaderpacks/ folder.
4. Launch Minecraft, open Options, then Video Settings, then Shader Packs, and select iterationT from the list.
5. Adjust the shader settings to suit your taste and your hardware.

Tags

voxel-pt, path-tracing, iris-only, realistic

Frequently asked questions about iterationT

Does iterationT work on Iris?

Yes, iterationT requires Iris Shaders and works only on that loader. It isn't compatible with OptiFine.

What graphics card do I need for iterationT?

The minimum graphics card is the GTX 1070. For comfortable gameplay (60+ FPS at 1080p), we recommend the RTX 3060. If you don't know which card you have, press Win + R, type dxdiag and check the Display tab.

Can I use iterationT with a texture pack?

Yes. Shaders work great with texture packs. Pairing iterationT with a PBR pack (such as Patrix, Stratum or UMSOEA) gives especially impressive results, because the shader can use the extra material information stored in the pack's normal and specular maps.

Does iterationT work on servers?

Yes. Shaders run only on the client side and don't require any changes on the server. You can use iterationT on any server, regardless of its configuration.