IllusionRP

Unity high-definition graphics plugin for Universal Render Pipelines.

Highlights

High-quality graphics features with one-click integration for your URP project
Ready-to-use shaders and templates for Amplify Shader Editor
Compatible with Unity 2022, 2023, and Unity 6 versions

Demo

Sponza Demo

IllusionRP demo for Sponza scene, see AkiKurisu/IllusionRP-Demo for more details.

Demo

AIChara Remaster Demo

IllusionRP is first designed to re-rendering game characters of @ILLUSION.

Demo is WIP, stay tuned.

Showcase

Notice

Designed for Forward and Forward+ rendering path, Deferred rendering path is not supported.

Add new shading model in deferred rendering path need modify the URP source code, which is hard to maintain. While using forward rendering path, we can add shaders without limitations.

Platforms

Android (Vulkan)
Standalone Windows (DX12)

Version

Unity 6

Unity 6.3 (URP 17.3.0)

Unity 2022 and Unity 2023

Unity 2022.3.62f1 (URP 14.0.12)
Unity 2023.2.22f1 (URP 16.0.6)

Install

Use git URL to download package by Unity Package Manager https://github.com/AkiKurisu/IllusionRP.git.

To fix compute shader compilation error when enable Forward+, copy the ./com.unity.render-pipelines.ps5~ folder to your project Package directory and rename it to com.unity.render-pipelines.ps5.

Setup

Replace Post Process Data with IllusionRPPostProcessData in your URP renderer asset.
Add Illusion Graphics renderer feature in your URP renderer asset.

[!Tip] For best visual experience and performance, I recommend you to enable Depth Priming and Forward+ in renderer asset to use Pre-Z Cluster Forward Rendering.

Features

Introduction to included rendering features.

Skin

Support Screen Space Subsurface Scattering (SSSSS) ported from HDRP and fallback to Spherical Gaussian Subsurface Scattering (SGSSS) introduced by Matt - Approximating Subsurface Scattering With Spherical Gaussians when screen space sss is disabled.

Dual Lobe Specular provides a more natural skin effect.

SSS

Hair

Support Kajiya-Kay shading model with better performance.

Support Marschner shading model implemented by Unreal Engine.

Hair Shading

Multipass is used (opaque & transparent).

OIT to solve hair transparent rendering order based on NVIDIA's Weighted Blended Order-Independent Transparency.

Fabric

Support Anisotropy Specular.

Anisotropy

Oren-Nayar diffuse model.

Sheen Scattering with Ashikhmin (smooth) and Charlie (softer) model.

Hybrid Lit

The upgraded version of Universal Render Pipeline/Lit shader.

Support PreIntegrated Imaged Based Lighting ported from HDRP.

Support all Screen Space Lighting features in IllusionRP.

Support Order Independent Transparency.

Hybrid Lit

[!TIP] You can directly replace the urp lit shader with Universal Render Pipeline/Hybrid Lit shader to get better lighting results.

Water

Water shader is modified from URP samples and has been converted to ASE version.

[!TIP] To sample full scene color instead of _CameraOpaqueTexture, you need enable requireHistoryColor or ScreenSpaceReflection in Illusion Graphics renderer feature.

Shadows

Support Per-Object Shadow based on stalomeow/StarRailNPRShader to enhance character shadow quality.

Include Contact Shadows ported from HDRP to capture small details.

Contact Shadows

Support Micro Shadows ported from HDRP to simulate small details embedded in the Material of a GameObject, but not in its Mesh geometry.

Support Fragment Shadow Bias to reduce shadow acne.

[!Warning] Enable Fragment Shadow Bias will let IllusionRP shaders not compatiable with URP's built-in shader since we now apply shadow bias in receiver fragement shader instead of in caster vertex shader.

Include Percentage-Closer Soft Shadow from recaeee/RecaNoMaho_P for more realistic shadows.

PCSS