Hierarchical N-body solver

Fast Multipole Gravity Lab

Softened Cartesian Taylor FMM evaluating long-range gravitational fields with adaptive quadtrees and dual-tree interaction passes.

M2M → M2L → L2L → P2P

Particles: 1,024 Frame Rate: 60.0 FPS FMM Solve Time: 1.20 ms Quadtree Nodes: 185 M2L Translations: 642 Sample Force Error: 0.42%

Scene Configuration

Preset

Particle Count 1024

FMM Solver

Expansion Order (p) 3

Separation Ratio (θ) 1.60

Leaf Capacity 32

Physics Parameters

Gravity (G) 0.65

Softening (ε) 0.018

Timestep (dt) 0.0030

View & Overlays

Motion Trails Adaptive Quadtree Overlay Acceleration Vectors Sampled Direct Error Check

Click canvas to inject particles · Shift+Click to add massive core · Space to pause