Running
Fast Multipole
Gravity Lab
Hierarchical N-body solver using Cartesian multipole expansions
M2M → M2L → L2L → P2P
Statistics
Particles
1024
FPS
60
FMM Solve
0 ms
Tree Nodes
0
M2L Calls
0
Force Error
—
Click to inject a particle cloud · Shift-click to add a massive body · Space pauses
Scene
Spiral Galaxy
Binary Galaxies
Orbital Ring
Cold Collapse
Three-Body Tracers
Particles
1024
Reset
Pause
Step
FMM Solver
Expansion Order
3
Separation Ratio
1.60
Leaf Capacity
32
Physics
Gravity
0.65
Softening
0.018
Timestep
0.003
View
Particle Trails
Quadtree Overlay
Acceleration Vectors
Sampled Error