Drag to orbit · scroll to zoom
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This is a real 3D molecular dynamics engine, not a reskin of the 2D version: particles live in a cubic box and interact through the same Lennard-Jones potential V(r)=4ε[(σ/r)^12-(σ/r)^6], but neighbor forces are found with a spatial cell-linked list rather than an all-pairs scan, and every particle is one instance of a single InstancedMesh so the whole cloud renders in one draw call while you orbit and zoom the camera freely. Velocity Verlet integration advances positions and velocities each substep with a clamped timestep, so the simulation stays stable even if a frame stalls. Watch clusters of particles pull into loosely bound groups at medium range, then flash apart the instant two get pushed inside the steep repulsive core — the same balance of attraction and repulsion that governs real van der Waals gases and liquids.