Hierarchical N-body solver
Fast Multipole Gravity Lab
A live 2D Newtonian gravity system using Cartesian multipole and local Taylor expansions with exact near-field interactions.
M2M → M2L → L2L → P2P
Particles
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FPS
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Solve
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Tree nodes
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M2L pairs
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Sample error
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Click
to inject a particle cloud ·
Shift-click
to add a massive body ·
Space
pauses