Instance Property

particleFriction

The friction coefficient of each particle in the system. Animatable.

Declaration

@property(nonatomic) CGFloat particleFriction;

Discussion

Friction determines a particle’s resistance to sliding motion after a collision. (To define collision behavior, see the colliderNodes property.) You can randomize the friction coefficients of particles in the system with the particleFrictionVariation property.

A value of 1.0 (the default) allows a particle to slide freely, and a value of 0.0 prevents a particle from sliding.

You can animate changes to this property’s value. See Animating SceneKit Content.

See Also

Simulating Physics for Particles

affectedByGravity

A Boolean value that determines whether gravity, as defined by the scene’s physics simulation, affects the motion of particles.

affectedByPhysicsFields

A Boolean value that determines whether physics fields in the scene affect the motion of particles.

colliderNodes

The nodes whose geometry the system’s particles can collide with.

particleDiesOnCollision

A Boolean value that determines whether particles are removed from the scene upon colliding with another object.

acceleration

The constant acceleration vector, in units per second per second, applied to all particles in the system. Animatable.

dampingFactor

A factor that slows particles relative to their velocity. Animatable.

particleMass

The mass, in kilograms, of each particle in the system. Animatable.

particleMassVariation

The range, in kilograms, of randomized particle masses. Animatable.

particleCharge

The electric charge, in coulombs, of each particle in the system. Animatable.

particleChargeVariation

The range, in coulombs, of randomized particle charges. Animatable.

particleBounce

The restitution coefficient of each particle in the system. Animatable.

particleBounceVariation

The range of randomized restitution coefficients for particles. Animatable.

particleFrictionVariation

The range of randomized friction coefficients for particles. Animatable.