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-# linon
+# Interactive Exploration of Nonlinear Ray Casting
 
-Non-Linear Ray Casting
+The _linon_ project is the result of an advanced software practical in the [Visual Computing Group](https://vcg.iwr.uni-heidelberg.de/) at the Institute of Computer Science, Heidelberg University.
+It is based on the [Rust](https://www.rust-lang.org/) programming language and the upcoming [WebGPU](https://web.dev/gpu/) graphics standard through the [wgpu](https://github.com/gfx-rs/wgpu) library.
+At its core is the continuous evaluation of ray paths in a nonlinear field through [4th order Runge-Kutta integration](https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta_methods).
 
-## References
+Prebuilt binaries for Windows, macOS and Linux can be found in the [releases](https://github.com/niklaskorz/linon/releases) of the Github repository.
+If you are running a nightly version of Firefox or Chrome and have the WebGPU flag enabled, you can also run [linon on the web](https://niklaskorz.github.io/linon/).
+See https://web.dev/gpu/#enabling-via-about:flags for information on how to enable WebGPU in Chrome Canary.
 
-1. E. Gröller, "Nonlinear Ray Tracing: Visualizing Strange Worlds," _The Visual Computer_, vol. 11, no. 5, pp. 263–274, 1995, doi: [10.1007/BF01901044](https://doi.org/10.1007/BF01901044).
-2. T. Möller and B. Trumbore, "Fast, Minimum Storage Ray-Triangle Intersection," _Journal of Graphics Tools_, vol. 2, no. 1, pp. 21–28, 1997, doi: [10.1080/10867651.1997.10487468](https://doi.org/10.1080/10867651.1997.10487468).
-3. Y. Zhao and others, "Visual Simulation of Heat Shimmering and Mirage," _IEEE Transactions on Visualization and Computer Graphics_, vol. 13, no. 1, pp. 179-189, 2007, doi: [10.1109/TVCG.2007.24](https://doi.org/10.1109/TVCG.2007.24)
+## Usage
+
+The application provides a sandbox for defining and exploring field functions that are evaluated inside a compute shader and rendered through ray casting.
+
+![Screenshot](screenshot.png)
+
+On the right side, the main view gives the possibility to explore the nonlinear scene using arcball camera controls.
+The left side contains a reference view in which the path of rays is visualized linearly in a rasterized scene.
+By clicking on a fragment of the main view, the rays around this fragment are visualized in the reference view.
+The user can select from a list of predefined field functions on the top left of the application, and then edit the function inside the text editor below.
+Through the "Overlay" dropdown, a [Lyapunov exponents](https://en.wikipedia.org/wiki/Lyapunov_exponent) overlay can be enabled to emphasize areas in image space for which rays diverge in behavior.
+The "Outline" button next to it renders a path mesh for the rays on the outline of these divering areas.
+If the image appears fragmented or inaccurate, the "Enhance" button can be used to rerender the current frame once using a smaller step size for Runge-Kutta integration.
+
+## Build instructions
+
+Compilation requires at least [Rust](https://www.rust-lang.org/) version 1.54 to be installed.
+The preferred way of installing Rust is through [rustup](https://rustup.rs/).
+Furthermore, an up to date graphics driver with support for Vulkan or DirectX 12 is assumed.
+If you are on macOS, Apple's Metal graphics API will be used automatically by WebGPU.
+Then, use cargo (included in Rust) for execution or compilation in the root of the repository.
+The dependencies (listed in `Cargo.toml`) will be downloaded and built automatically by cargo.
+
+```sh
+# Build and run release build
+cargo run --release
+# Build and run debug build
+cargo run
+# Build release build (see target/ directory)
+cargo build --release
+# Build debug build (see target/ directory)
+cargo build
+```
+
+To build the web version of linon, execute the following commands:
+
+```sh
+rustup target add wasm32-unknown-unknown
+cargo install -f wasm-bindgen-cli --version 0.2.77
+RUSTFLAGS=--cfg=web_sys_unstable_apis cargo build --no-default-features --target wasm32-unknown-unknown --release
+wasm-bindgen --out-dir public --web target/wasm32-unknown-unknown/release/linon.wasm
+```
+
+The resulting web application in the `public/` directory can then be served by an HTTP server of your choice.
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