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Alpha Piscium SHADER PACK
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ALPHA
PISCIUM

> VERSION:  1.9.0
> TARGET:  MINECRAFT JAVA
> TECH:  ReSTIR SSGI / VOLUMETRIC / EPIPOLAR
> STATE:  EXPERIMENTAL
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CORE MODULES

> GRAPHICS PIPELINE

GI LIGHTING

  • > ReSTIR SSGI
  • > ReBLUR Denoiser
ref: doi/10.1145/3386569.3392481

ATMOSPHERE

  • > UE Sky Render
  • > Epipolar Sampling
ref: egsr2020

SHADOWS

  • > Adaptive RTWSM
  • > Rectilinear Warping
ref: Rosen.2012

VOLUMETRICS

  • > Nubis Cloud System
  • > Real-time Shaping
tech: Guerrilla

CHANGELOG

v1.9.0 LATEST
May 26, 2026
HIGHLIGHT
  • > Added specular GI
NEW
  • > Added specular GI
FIX
  • > Increased AE speed at low fps
  • > Fixed screenspace shadow uninitialized warnings
  • > Fixed handheld alpha test shadow
  • > Fixed Voxy before 0.2.6
v1.8.6-Hotfix1
May 2, 2026
FIX
  • > Fixed no voxy bug
v1.8.6
Apr 26, 2026
HIGHLIGHT
  • > Added Voxy support
  • > Switched to Adobe f82 Schlick fresnel, replacing the previous HCM model for more accurate specular appearance
NEW
  • > Added video render mode setting
IMPROVEMENT
  • > Switched to regular spherical cap GGX VNDF sampling for translucent
  • > Shadow sample optimization for improved performance
FIX
  • > Fixed temporal reuse exploding after zooming in
  • > Fixed shadow rendering on SSS (subsurface scattering) surfaces
  • > Fixed water scattering overflow near sunset/sunrise
  • > Fixed `time_interpolate` behavior
  • > Fixed atmosphere depth break indirect dispatch
MISC
  • > Cleaned up SST and ReSTIR temporal reuse logic
v1.8.5
Apr 6, 2026
HIGHLIGHT
  • > Major improvements to ReSTIR SSGI stability and quality
NEW
  • > Readded RCRS anti firefly to GI denoiser pipeline
  • > Added ReSTIR Temporal Reuse Limit setting for better user control on GI responsiveness
  • > Added FXAA as TAA history missing fallback
IMPROVEMENT
  • > Combined sun and moon Sky-View LUT
  • > Optimized colored shadow precondition check
  • > Uses blue noises in ReSTIR for better noise distribution
  • > Reduced denoiser history fix leaks
  • > Improved shadow AABB calculation and cleanup
  • > ReSTIR uses full bilateral bilinear temporal resampling to improve stability and quality
  • > Updated default accumulation settings for less lighting lags
  • > Reduced GI reprojection false anti-stretching history kills
  • > GI denoiser history fix skips first 3 LODs for fewer fireflies
  • > Replaced bloom hard clipping with soft clipping
  • > Switch TAA variance AABB history ratification from clamping to clipping
  • > Optimized ReSTIR reuse passes
  • > Water volume tweak
  • > Use AABB clipping for fast history clamping
  • > Use bilinear on fast history for free blurring and fewer noises
  • > Use distance between probe pixel position and origin position as fade distance
FIX
  • > Fixed atmosphere mie coefficient calculation for low turbidity value
  • > Fixed DH water material detection
  • > Fixed DH water shadow blending
  • > Fixed random emissive from DH solid
  • > Slightly mitigated shadow acne
  • > Fixed SSS singularity bug in SRGB rendering working space
  • > Removed denoiser stabilization pass to fix bleeding
  • > Fixed GI grid pattern artifacts caused by bad `reprojectInfo.curr2PrevScreenPos` precision
  • > Fixed TAA reset missing
  • > Fixed emissive bug on 0 albedo material
MISC
  • > Migrated cloud ambient LUT to shadesmith tiles for optimized texture management
  • > Cleaned up SSBO usage
  • > Removed env probe setup clearing
  • > Fixed make zip naming
v1.8.4
Mar 7, 2026
HIGHLIGHT
  • > Added limited Built-in PBR support
  • > Improved translucent rendering with double refraction
NEW
  • > Added limited Built-in PBR support (Foliage SSS, Translucent, and Emissive)
  • > Added double refraction for non-water translucents for more accurate light bending
  • > Added more per-material translucent absorption settings
IMPROVEMENT
  • > Migrated TranslucentSST to the new SST implementation, greatly simplifying the code
  • > Improved cloud spherical shell setup
  • > Improved water scattering with new phase function based on Petzold data
FIX
  • > Fixed translucent sky reflection error
  • > Fixed DH (Distant Horizons) support
  • > Fixed missing TAA clamp mix logic
  • > Fixed cloud spherical shell setup
  • > Fixed insanely bright emissive from end rod and charged lightning rod
MISC
  • > Increased default PCSS sample count for better shadow softness
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ROADMAP

v1.9 SPECULAR GI

Add Specular GI

v2.0 WORLD SPACE TRACING

Voxelization / Voxel Tracing

v2.1 DRT UPDATE

Skibidi DRT / HDR Mod Support?

v2.2 VOLUMETRIC SHADOWING

Cloud Shadowing / Screen Space Shadow

v2.3 LOCAL FOG

Add Ground Fog

v2.4 CLOUD SHADOW

Terrain Cloud Shadow / Reflection GI Clouds

v2.5 CLOUD UPDATE PT. 1

Cloud Lighting / Altocumulus / Cirrus Rewrite

v2.6 CLOUD UPDATE PT. 2

Cumulus Rewrite / Stratocumulus / Nimbostratus

v2.7 UPSCALING???

FSR 3.1?

v2.8 PARALLAX???

Parallax Mapping + Shadow

[ROADMAP SNAPSHOT] 04/27/2026 // SUBJECT TO CHANGE

> OPEN FAQ LOG

[ERROR: NIGHT LIGHTING MISSING]

> CAUSE: Vanilla assets.
> FIX: Install PBR Pack (e.g., SPBR, Patrix).

[ERROR: LOADING FAIL]

> FIX: Use Iris 1.7+.
> CMD: Press Ctrl+D to reload.

[HARDWARE MATRIX]
INTEL UNSUPPORTED
AMD DRIVER > 22.7.1
NVIDIA OPTIMIZED
[ARTIFACT LOG]

"Darkness when looking back."
> Screenspace limitation. Status: WONT FIX.

FATAL ERRORS: Report to GitHub with logs from .minecraft/patched_shaders