Particles closer than this many cells above the ground also get Coulomb friction (before they move; the
normal velocity is kept, so they still settle onto the ground).
The grid boundary alone acts on nodes inside the ground, which a resting particle's stencil only partly
reaches, so bodies would creep down any slope whatever the friction.
Particles closer than this many cells above the ground also get Coulomb friction (before they move; the normal velocity is kept, so they still settle onto the ground). The grid boundary alone acts on nodes inside the ground, which a resting particle's stencil only partly reaches, so bodies would creep down any slope whatever the friction.