🌌 Barnes-Hut N-Body Gravity Approximation (2D)

Watch a quadtree approximate gravity between hundreds of moving bodies in real time: each cell aggregates a total mass and center of mass, and the theta opening-angle criterion decides whether a distant cluster of bodies is treated as one point mass or the algorithm recurses into it. A live counter compares the resulting O(n log n) force calculations against the brute-force O(n squared) count it replaces.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install