Fast Multipole Gravity Lab

Solver telemetry

Particles1,024 Frame rate— FMM solve— Tree nodes— M2L translations— Sample errorsampling…

Simulation controlsFMM

Scene

Initial condition

Particle count 1024

Expansion order 3

Separation ratio 1.60

Leaf capacity 32

Gravity 0.65

Softening 0.018

Timestep 0.0030

Particle trails Quadtree overlay Acceleration vectors Automatic error

Higher orders and stricter separation improve accuracy but increase M2L work. The direct solver is used only for sampled validation.

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