Particle Source

Particle Source fills a closed mesh with a lattice of particles at Particle Size and Packing Density, with optional jitter, or turns the incoming points in a Group into particles. Each particle gets its contact radius, mass and type as point attributes that the Nexus solver reads per point.

Particle Type sets Grain (particles that collide with friction) or Fluid (which also keeps a constant density). The Physical page sets mass and per-point multipliers for friction, repulsion, attraction, viscosity, surface tension and adhesion, and fluid Phase, so sand, gravel, water and honey can share one simulation, each with its own behavior.