AMD FidelityFX Screen Space Reflections

High-fidelity reflections in your scene, without costing the earth. AMD FidelityFX™ Stochastic Screen Space Reflections (SSSR) uses your rendered frame to create brilliant reflections. 

Supports:

  • Direct3D®12.
  • Vulkan®.

Download the latest version - v1.3

This release adds the following features:

Download the latest version - v1.4

This release includes:

Part of the AMD FidelityFX™ SDK

AMD FidelityFX SDK components

Features

State-of-the-art algorithm

Optimized for Shader Model 6.0+

Open source, MIT license

Details

AMD FidelityFX SSSR provides an open source library to easily integrate stochastic screen space reflections into your game.

The term “Screen Space Reflections” describes an effect that can create realistic looking reflections purely based on information already present in the rendered image. The underlying algorithm shoots reflection rays from a depth imprint of the rendered scene (a so-called “depth buffer”) and follows them in constant steps through the image until these rays intersect with the depth buffer again. Instead of taking constant-sized steps, AMD FidelityFX SSSR builds on an industry-leading algorithm that searches the rendered image in a hierarchical manner. This allows for larger and fewer steps on average, increasing performance of the search and quality of the final image.

To support glossy reflections, this AMD FidelityFX effect jitters the reflection rays to create the sense of surfaces with varying roughness. However, that approach inherently introduces noise. Thus, AMD FidelityFX SSSR comes with a high quality denoiser specifically optimized for the AMD RDNA™ architecture. The denoiser combines the results from multiple frames to create a noise-free image. Furthermore, it allows the ray count to decrease based on surface roughness, thus further speeding up screen space traversal. 

Library features

  • Hierarchical depth buffer traversal kernel.
  • Confidence based hit validation.
  • Support for Direct3D®12 API and Vulkan® API.
  • Shaders written in HLSL utilizing SM 6.0 wave-level operations.

Sample application

A sample application is provided for Direct3D®12 and Vulkan® showing the following features:

Shadow Denoiser

AMD FidelityFX Denoiser

AMD FidelityFX Denoiser is a set of denoising compute shaders which remove artefacts from reflection and shadow rendering.

Comparison

Chess pieces without SS reflections Chess pieces with SS reflections

How it works

Reflection result processed by AMD FidelityFX Denoiser:

Screen Space Reflections
Environment Lookup
Combined Result

Additional resources

Version history

  • This is a small-yet-breaking update to our SSSR technique created to support our hybrid reflections sample, which shows you how to mix ray traced reflections and SSSR.

Vulkan® support.

  • Initial release

Useful information

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Find out what developers are saying about AMD FidelityFX.

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