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A Ray Caster in Rust (+ Webassembly)

This is a small sample project I used for learning Rust and experimenting with Webassembly. It is a simple Ray Caster that renders a simple 3D maze completely in Software. There is also a Swift version of the Ray Caster. It also contains a detailed introduction into Ray Casting with code examples.

Try the browser version to play with it instantly or compile on your desktop!

Supported Plattforms

Browser: iOS 11.3+ (iOS 11.2.x is broken…) Android 8.0 At least: Safari 11, Chrome, Firefox

Native: macOS, Linux, Windows

How to Build

To build the desktop or the browser version you need to install the Rust compiler first:

curl -sSf | sh

During the installation, you may be asked for installation options. Just press Enter to select the default option. After the installation succeeded make sure that all environment variables are set up:

source ~/.profile

You may also need to install libSDL. On macOS you can do this with brew:

brew install sdl2

On Ubuntu / Debian:

apt install libsdl2-dev

The Desktop Version

You can build an run the desktop version by typing

cargo run

The Browser Version

To build the browser version, you need to install the Emscripten SDK. Create a new folder on your file system and open it in your terminal. Then run the following commands to install the SDK:

git clone
cd emsdk
./emsdk update
./emsdk install latest
./emsdk activate latest
source ./ build sdl2

We also need to setup Webassembly support for Rust:

rustup target add wasm32-unknown-emscripten

Finally, switch back to the ray caster source folder to build the browser version:


The compilation result is then stored to the folder html. Since Webassembly can’t be directly embedded to a HTML page you need a web server for running the binary. Just copy the entire html folder to your web server and then open the index.html page in your browser.

Changing the Map

You can change the map by editing the text file in „assets/map.txt“. Each character represents a field in the map. Use the space character for empty fields. You can use „R“, „G“, „B“, „Y“, „O“ to create colored walls. The map is embedded during compilation, so every change of the map requires a recompilation.


I’m still a Rust novice: I’m really interested in any feedback regarding my Rust code.