Instance Property

acceleration

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

Declaration

@property(nonatomic) SCNVector3 acceleration;

Discussion

Use this property to simulate effects such as wind or gravity on particles.

To use the same gravity vector that applies to physics bodies in the scene, or to apply more than one constant acceleration to particles, see the affectedByGravity property.

The default value is SCNVector3Zero, specifying no acceleration.

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.

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.

particleFriction

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

particleFrictionVariation

The range of randomized friction coefficients for particles. Animatable.