dampingFactor
A factor that slows particles relative to their velocity. Animatable.
Declaration
var dampingFactor: CGFloat { get set }Discussion
Use this property to simulate effects such as fluid friction or air resistance on particles. A value of 0.0 (the default) specifies no slowing—that is, each particle maintains a constant speed (unless affected by gravity, acceleration, physics fields, or other influences). A value of 1.0 prevents particles from moving.
You can animate changes to this property’s value. See Animating SceneKit Content.