Fast Multipole Gravity Lab

Live telemetry

Particles1,024

FPS—

FMM solve— ms

Tree nodes—

M2L pairs—

Sample force error—

Simulation settings

● RUNNING

Initial conditions

Particle count1,024

Expansion order3

Separation ratio1.60

Leaf capacity32

Increasing order can improve far-field accuracy. Higher orders and stricter separation ratios require more work.

Gravity, G0.65

Softening, ε0.018

Timestep0.0030

Particle trails Quadtree overlay Acceleration vectors Sampled force error

Error is measured against exact direct forces for up to 24 samples every 25 frames; it is not used by the solver.

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