Preset

Bodies N: 500 θ (theta): 0.70 Softening ε: 3.0 Gravity G: 1.0 Time step dt: 0.20

Show quadtree Highlight θ-descent for picked body Compare with naïve O(n²)

Stats

N bodies0

θ0

Tree nodes0

Max depth0

BH evals/step0

Naïve n(n−1)/20

Speed-up—

Kinetic E0

Potential E0

Click any body to pick it for θ-descent highlighting. Cyan boxes = approximated as a single centre-of-mass; pink boxes = recursed into. Larger θ → more approximation → fewer force evaluations but lower accuracy.