Hierarchical N-body solver

Fast Multipole Gravity Lab

Adaptive quadtree Cartesian FMM with dual-tree traversal, 1–5th order expansions, softened Newtonian gravity and a live direct-summation accuracy check.

M2M → M2L → L2L → P2P

Particles0

Frames / s0

FMM solve0.00 ms

Quadtree nodes0

M2L pairs0

Sample force err–

Click to inject a particle cloud · Shift-click to add a massive body · Space pauses