The nbody from pjankiewicz

nbody's Introduction

Yet another n-body simulation in Rust

This is a weekend project utilizing several technologies:

Bevy - game engine
egui - UI elements
webassembly - wasm-bindgen is used to compile Rust to webassembly which can be run in the browser

The code to calculate velocities of objects is naive all pairs algorithm which can handle up to 1000 objects in 60.0 FPS on a laptop. Web version is 4x slower which means it can handle around 500 objects.

Screenshot

Demo

https://pjankiewicz.github.io/nbody/index.html

Running desktop application

cargo run --release

Building webassembly version

cargo build --release --target wasm32-unknown-unknown
wasm-bindgen --out-dir ./out/ --target web ./target/wasm32-unknown-unknown/release/nbody.wasm

Running

python -m http.server

And navigate to http://localhost:8000 in your browser.

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nbody's Issues

Installation failed

For a fresh clone, I got the following error when running cargo build --release --target wasm32-unknown-unknown

   Compiling bevy_ecs v0.7.0
error[E0433]: failed to resolve: unresolved import
  --> /home/cph/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stdweb-0.4.20/src/webcore/ffi/wasm_bindgen.rs:67:32
   |
67 |             alloc: &Closure< Fn( usize ) -> *mut u8 >,
   |                                ^ unresolved import

   Compiling webbrowser v0.7.1
   Compiling egui v0.18.1
   Compiling wgpu v0.12.0
error[E0425]: cannot find function `wasm_bindgen_initialize` in this scope
  --> /home/cph/.cargo/registry/src/index.crates.io-6f17d22bba15001f/stdweb-0.4.20/src/webcore/ffi/wasm_bindgen.rs:77:22
   |
77 |         let module = wasm_bindgen_initialize( memory, table, &alloc, &free );
   |                      ^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope

Perhaps providing a Cargo.lock ?

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