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AtmosphereRenderer

(★ 98)

A C++/DirectX 11 implementation of "A Scalable and Production Ready Sky and Atmosphere Rendering Technique"

File Explorer

Download Latest Version (.zip)

- aerial_lut.hlsl
- bn.png
- intersection.hlsl
- medium.hlsl
- mesh.hlsl
- multiscatter.hlsl
- postcolor.hlsl
- shadow.hlsl
- sky.hlsl
- sky_lut.hlsl
- sun.hlsl
- terrain.obj
- transmittance.hlsl
- - .editorconfig
  - cyAlphaDistribution.h
  - cyBVH.h
  - cyColor.h
  - cyCore.h
  - cyGL.h
  - cyHairFile.h
  - cyHeap.h
  - cyIPoint.h
  - cyIVector.h
  - cyLightingGrid.h
  - cyMatrix.h
  - cyPoint.h
  - cyPointCloud.h
  - cyQuat.h
  - cySampleElim.h
  - cySpatial.h
  - cyString.h
  - cyTimer.h
  - cyTriMesh.h
  - cyVector.h
  - LICENSE
  - README.md
- agz-utils
- 00.png
- 01.png
- 02.png
- aerial_lut.cpp
- aerial_lut.h
- camera.cpp
- camera.h
- common.h
- main.cpp
- medium.cpp
- medium.h
- mesh.cpp
- mesh.h
- multiscatter.cpp
- multiscatter.h
- shadow.cpp
- shadow.h
- sky.cpp
- sky.h
- sky_lut.cpp
- sky_lut.h
- sun.cpp
- sun.h
- transmittance.cpp
- transmittance.h
.gitignore
.gitmodules
CMakeLists.txt
LICENSE
README.md

# Installation Guide

1. Get the code

git clone https://github.com/AirGuanZ/AtmosphereRenderer

Downloads the entire project code from GitHub to your computer.

cd AtmosphereRenderer

Moves into the project folder you just downloaded.

2. CMake

Medium Recommended

Prerequisites

Git Needed to download the project code from GitHub.
CMake The tool used to generate build configuration.
C/C++ 컴파일러 Windows needs Visual Studio (Community edition, free), macOS needs Xcode Command Line Tools, Linux needs the gcc/g++ package.

cmake ..

Analyzes the source code and generates build configuration files (must be run inside the build folder).

✅ Check that an executable was created inside the build folder, then run it directly (e.g. ./build/app_name).

Pulled directly from this repo's README.

// repository documentation

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# Atmosphere Renderer

A C++/DirectX 11 implementation of "[A Scalable and Production Ready Sky and Atmosphere Rendering Technique](https://sebh.github.io/publications/egsr2020.pdf)"

## Features

* interactive edition of atmosphere model parameters
* efficient generation of low-resolution sky-view LUT and aerial perspective LUT 
* volumetric shadow

## Build

```powershell
git clone --recursive https://github.com/AirGuanZ/AtmosphereRenderer.git
cd AtmosphereRenderers
mkdir build
cd build
cmake ..
```

## Control

* move: `W, A, S, D, Space, LShift`
* show/hide cursor: `Ctrl`.

## Performance

Crucial shader performance measured on NVIDIA GTX 1060:

* Sky-view LUT generation (64 * 64): 0.036 ms
* Aerial perspective LUT generation without volume shadow (64 * 64 * 32): 0.03 ms
* Aerial perspective LUT generation with volume shadow (200 * 150 * 32): 0.2 ms

Shaders can actually be further optimized by replacing feature flags in constant buffers with compile-time macros.

Using `LUTs with higher resolution` or `ray marching with more number of steps` results in better quality and of course, lower performance.

## Screenshots

![](https://raw.githubusercontent.com/AirGuanZ/AtmosphereRenderer/main/gallery/00.png)

![](https://raw.githubusercontent.com/AirGuanZ/AtmosphereRenderer/main/gallery/01.png)

![](https://raw.githubusercontent.com/AirGuanZ/AtmosphereRenderer/main/gallery/02.png)

## Tips

* Planet-scale rendering are not considered. Thus the sky may become strange when camera is out of the atmosphere.
* Terrain renderer is just used to show the aerial perspective effect (transmittance and in-scattering), so multi-scattering related to terrain is simply ignored.
* Terrain occlusion is ignored when computing multi-scattering LUT.
* Sunlight is approximated as a directional light when computing atmosphere scattering. Thus a very big sun disk will always have an unnatural appearance.