Barnes-Hut

This is the official repository for the code shown in How to make HUGE N-Body Simulations (N=1,000,000+)

This repository consists of three branches:

1. The master branch.

   This is the code shown in the video and is my (mostly) faithful implementation of the original algorithm as described in the Barnes-Hut paper.

2. The improved branch.

   This modifies the original algorithm by a) storing the nodes in a cache friendly order and b) allowing multiple bodies to inhabit the same leaf node.

3. The parallel branch.

   This is a crude attempt at parallelizing the improved branch to show its potential.

Guide

1. Install Rust
2. Clone the repository
3. If you're not on Windows, follow this
4. Checkout the desired branch
5. Open the folder in a terminal
6. Run 'cargo run --release'
7. Enjoy

Controls

• Scroll to zoom
• Middle mouse button to grab view
• Right mouse button to spawn a body
• To change the mass of the body, wind the mouse around it while holding right click
• Space to pause/continue
• E to open a menu where you can enable the quadtree visualization