74 lines
3.2 KiB
Plaintext
74 lines
3.2 KiB
Plaintext
UnitySSPathTracingURP
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=============
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Screen Space Path Tracing for Unity's URP (Universal Render Pipeline).
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This shader is created in Shader Graph with the new URP 14 Full Screen Pass Renderer Feature.
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This effect seems to be usable (stability, speed & noisiness) when I tested it on mobile device, so I decide to share it.
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**Please read the Documentation and Requirements before using this repository.**
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Screenshots
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**(BoxScene + Reflection Probe Fallback)**
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Offline Accumulation
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Real-time Accumulation
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**Note:** Enable URP Temporal Anti-aliasing is important for improving stability. (exists since latest URP 14)
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**(Not Included)**
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Original Cornell Box
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[Classroom](https://www.blender.org/download/demo-files/) by Christophe Seux (CC0)
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[Stormtrooper Star Wars VII](https://www.blendswap.com/blend/13953) by ScottGraham (CC-BY-3.0)
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Refraction (Lit by emission)
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Documentation
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------------
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[Here](https://github.com/jiaozi158/UnitySSPathTracingURP/blob/main/Documentation/Documentation.md).
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Requirements
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------------
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- Unity 2022.2 and URP 14 (enable TAA is recommended)
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- Deferred rendering path (OpenGL will always in Forward path)
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- Forward rendering path ([need extra setup](https://github.com/jiaozi158/UnitySSPathTracingURP/blob/main/Documentation/ForwardPathSupport.md))
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- Multiple Render Targets support (at least OpenGL ES 3.0 or equivalent)
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- Lowering down the Render Scale (e.g. "0.5") on mobile devices and use upscaler (e.g. FSR 1.0) to reduce performance cost.
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- Use "Refraction Lit" shader graph to render screen space path traced refraction.
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License
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------------
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MIT 
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References
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------------
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[Three-Eyed-Games GPU-Ray-Tracing-in-Unity](http://three-eyed-games.com/2018/05/03/gpu-ray-tracing-in-unity-part-1/)
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[Introduction to Path Tracing - Marc Sunet](https://shellblade.net/files/slides/path-tracing.pdf)
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Please see [PathTracing.hlsl](https://github.com/jiaozi158/UnitySSPathTracingURP/blob/main/Assets/Shaders/ScreenSpacePathTracing/PathTracing.hlsl).
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