# Alpha Piscium
\nHigh-quality realistic Minecraft shaderpack featuring global illumination, volumetric clouds, atmospheric scattering, and stunning visual effects.<\/p>\n
Official Website link: https:\/\/alphapiscium.org\/
\nDiscord server link: https:\/\/discord.gg\/E2Uq2MmHgq<\/p>\n
<\/p>\n
## Features
\n– **Real-time Global Illumination**
\n – *Reservoir-based SpatioTemporal Importance Resampling* (ReSTIR) based Screen-Space Global Illumination
\n – *ReBLUR* based denoising
\n– Realistic, real-time, and fast **Atmospheric Scattering**
\n – *Unreal Engine Sky Atmosphere Rendering Technique*
\n – *Epipolar Sampling*
\n– Real-time **Volumetric Clouds**
\n – *Nubis*
\n– High-quality adaptive **Shadows**
\n – *Rectilinear Texture Warping* (RTWSM)<\/p>\n
## Installation
\n1. Download the Alpha Piscium shaders for Minecraft from Modrinth or GitHub Release.
\n2. Install Iris shader loader.
\n3. Open the Minecraft launcher and choose the Iris profile you just created with the version you’re playing.
\n4. Launch Minecraft.
\n5. Go to **Options** \u2192 **Video Settings** \u2192 **Shader Packs**, then click **Open Shader Pack Folder**.
\n6. Move the downloaded ZIP file into this folder (`.minecraft\/shaderpacks`).
\n7. In-game, select the newly installed pack from the shaders list. (If you select a shader pack using Iris, its filename will turn yellow.)
\n8. Click **Done** or **Apply** and the shader will be loaded.<\/p>\n
## FAQ
\n– **No lighting at night**: Please use PBR resource packs. For vanilla style, SPBR is recommended. Otherwise, try Patrix.
\n– **Can’t load shaderpack**: Please use Iris with version 1.7 or higher.
\n– **Everything goes dark when turning back**: This is due to the limitations of screenspace techniques. There isn’t a perfect way to fix this.
\n– **Intel GPU**: Alpha Piscium uses cutting-edge graphics technology. Unfortunately, Intel doesn’t maintain their OpenGL driver well, so Intel GPUs are not supported.
\n– **AMD GPU**: Check if your GPU driver is newer than 22.7.1. If older, please update your driver.
\n– **Other loading errors**: Press Ctrl+D in Iris’s shaderpack selection screen, then reload the shaderpack. Make an issue with the error message and the relevant files in `.minecraft\/patched_shaders` as shown in the error message.<\/p>\n
## Roadmap
\n### 1.8 Diffuse GI
\n– Diffuse GI improvement
\n– Denoiser overhaul
\n– ReSTIR Diffuse “GI\u201d
\n– Shadow\/SSS blur fix
\n– Optimize PCSS for both quality and performance<\/p>\n
### 1.9 Specular GI
\n– Add specular GI<\/p>\n
### 1.10 Voxy support
\n– Add voxy support
\n– Epipolar sampling screen space shadow
\n– Address shadow map light leaks<\/p>\n
### 1.11 More Volumetrics
\n– Clouds in sky lighting
\n– Fog
\n– Cloud shadows<\/p>\n
### 1.12 Parallax Mapping
\n– Add steep\/smooth parallax mapping
\n– Add parallax mapping shadow<\/p>\n
### 1.13 More Cloud?
\n– Improve cirrus cloud modeling
\n– Mid altitude clouds (altocumulus)<\/p>\n
## License
\nFiles under the `scripts` directory are licensed under the MIT License. All other files are licensed under the GNU General Public License v3.0.<\/p>\n","protected":false},"excerpt":{"rendered":"
High-quality realistic Minecraft shaderpack.<\/p>\n","protected":false},"featured_media":11977,"template":"","meta":{"_minecraft_slug":"alpha-piscium","_minecraft_project_id":"bvDpxd8c","_minecraft_author":"Luna5ama","_minecraft_license":"GPL-3.0-only","_minecraft_downloads":120201,"_minecraft_follows":138,"_minecraft_client_side":"required","_minecraft_server_side":"unsupported","_minecraft_storage_type":"zip","_minecraft_archive_name":"alpha-piscium.zip","_minecraft_size_bytes":1192548607,"_minecraft_version_count":26,"_minecraft_updated_at":"2026-05-16T10:57:05.840084Z","_minecraft_date_created":"2025-10-16T06:52:41.358156Z","_minecraft_date_modified":"2026-05-02T04:35:36.721986Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/alpha-piscium","_minecraft_icon_attachment_id":11977,"_minecraft_imported_at":"2026-05-31T16:49:15+00:00","_minecraft_import_hash":"523caca8b2e4d0624adc8dd7ac7fdcee","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[880,881,892,882,883,1012,893,169,1002,1011,889],"mod_loader":[890],"minecraft_version":[101,102,62,37,745,40,801,41,808,809,810,811,812,813,814,815,73,71,72,746,747,748,749,750,74,38,751,752,753,754,755,756,78,767,768,769,770,771,79,780,781,782,783,784,80,785,786,81,787,82,796,797,798,799,800],"class_list":["post-11976","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-atmosphere","mod_category-bloom","mod_category-colored-lighting","mod_category-high","mod_category-iris","mod_category-path-tracing","mod_category-pbr","mod_category-realistic","mod_category-reflections","mod_category-screenshot","mod_category-shadows","mod_loader-iris","minecraft_version-1-20-5","minecraft_version-1-20-6","minecraft_version-1-21","minecraft_version-1-21-1","minecraft_version-1-21-1-rc1","minecraft_version-1-21-10","minecraft_version-1-21-10-rc1","minecraft_version-1-21-11","minecraft_version-1-21-11-pre1","minecraft_version-1-21-11-pre2","minecraft_version-1-21-11-pre3","minecraft_version-1-21-11-pre4","minecraft_version-1-21-11-pre5","minecraft_version-1-21-11-rc1","minecraft_version-1-21-11-rc2","minecraft_version-1-21-11-rc3","minecraft_version-1-21-2","minecraft_version-1-21-2-pre1","minecraft_version-1-21-2-pre2","minecraft_version-1-21-2-pre3","minecraft_version-1-21-2-pre4","minecraft_version-1-21-2-pre5","minecraft_version-1-21-2-rc1","minecraft_version-1-21-2-rc2","minecraft_version-1-21-3","minecraft_version-1-21-4","minecraft_version-1-21-4-pre1","minecraft_version-1-21-4-pre2","minecraft_version-1-21-4-pre3","minecraft_version-1-21-4-rc1","minecraft_version-1-21-4-rc2","minecraft_version-1-21-4-rc3","minecraft_version-1-21-5","minecraft_version-1-21-5-pre1","minecraft_version-1-21-5-pre2","minecraft_version-1-21-5-pre3","minecraft_version-1-21-5-rc1","minecraft_version-1-21-5-rc2","minecraft_version-1-21-6","minecraft_version-1-21-6-pre1","minecraft_version-1-21-6-pre2","minecraft_version-1-21-6-pre3","minecraft_version-1-21-6-pre4","minecraft_version-1-21-6-rc1","minecraft_version-1-21-7","minecraft_version-1-21-7-rc1","minecraft_version-1-21-7-rc2","minecraft_version-1-21-8","minecraft_version-1-21-8-rc1","minecraft_version-1-21-9","minecraft_version-1-21-9-pre1","minecraft_version-1-21-9-pre2","minecraft_version-1-21-9-pre3","minecraft_version-1-21-9-pre4","minecraft_version-1-21-9-rc1"],"yoast_head":"\n