Hierarchical N-body solver

Fast Multipole Gravity Lab

Adaptive Cartesian expansions turn distant particle clusters into smooth local gravity fields—in real time.

M2M → M2L → L2L → P2P

1,024Particles

—Frames / sec

—FMM solve ms

—Tree nodes

—M2L links

sampling…Force error

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