Compute Stochastic Screen Space Reflections

Compute Stochastic Screen Space Reflections for Unity post processing. Utilizing shared memory for performance. Should be mostly production ready, except for a few Hierarchical Z-depth casting artifacts.

Contents

• Features
• Requirements
• Installation
• Usage
• References
• Showcase
• Real life usage
• Screenshots
• Before and After
• Performance

Features

• Hierarchical Z-depth casting
• Temporal reflection depth reprojection
• Median Filtering for extra denoising
• Reflection Color Mipmap Pyramid
• Raycast and resolve pass downsampling
• Frame reprojection for faking multiple bounces
• Specular elongation
• Contact hardening

Requirements

• Works only with deferred rendering
• Compute shader capable video card
• Unity Post Processing v2
• Tested with Unity 2018.2

Installation

In a unity project go to your Packages folder. Open manifest.json and add into the dependencies the following line:

"com.simeonradivoev.stochastic-reflections": "https://github.com/simeonradivoev/ComputeStochasticReflections.git"

It should look something like this:

{
    "dependencies": {
        "com.unity.ugui": "1.0.0",
        "com.unity.modules.ui": "1.0.0",
        "com.simeonradivoev.stochastic-reflections": "https://github.com/simeonradivoev/ComputeStochasticReflections.git",
    } 
}

Usage

Just add a new effect in a post processing profile under Custom/Stochastic Screen Space Reflections For VR use the test branch called StereoRendering. It currently only supports multi pass rendering.

References

• Rewritten from Xerxes1138
• Based mainly on Tomasz Stachowiak and Yasin Uludag, Siggraph15

Showcase

Real life usage

Screenshots

Before and After

Performance

Tested on a GTX 1070 at 1080p

• Highest Quality, High Quality Blur

  • Raycasting: 1.4 ms
  • Blur: 0.73 ms
  • Temporal: 0.67 ms
  • Resolve: 0.55 ms
  • Total + Others: 4.15 ms

• Raycast and Resolved downsampled, Low Quality Blur

  • Raycasting: 0.5 ms
  • Temporal: 0.19 ms
  • Resolve: 0.19 ms
  • Total + Others: 1.7 ms