Instance Property


The range, in degrees per second, of randomized initial angular velocities for particles. Animatable.


var particleAngularVelocityVariation: CGFloat { get set }


Setting a nonzero value for this property randomizes the effect of the particleAngularVelocity property. SceneKit randomly adjusts the initial angular velocity of each particle by up to half the particleAngularVelocityVariation value. For example, if the particleAngularVelocity value is 10.0 degrees per second and the particleAngularVelocityVariation value is 5.0 degrees per second, newly spawned particles spin at random speeds between 7.5 and 12.5 degrees per second.

The default value is 0.0 degrees per second, specifying no randomization.

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

See Also

Managing Particle Motion

var particleAngle: CGFloat

The rotation angle, in degrees, of newly spawned particles. Animatable.

var particleAngleVariation: CGFloat

The range, in degrees of randomized initial particle angles. Animatable.

var particleVelocity: CGFloat

The initial speed, in units per second, for newly spawned particles. Animatable.

var particleVelocityVariation: CGFloat

The range, in units per second, of randomized initial particle speeds. Animatable.

var particleAngularVelocity: CGFloat

The initial spin rate, in degrees per second, of newly spawned particles. Animatable.

var particleLifeSpan: CGFloat

The duration, in seconds, for which each particle is rendered before being removed from the scene. Animatable.

var particleLifeSpanVariation: CGFloat

The range, in seconds, of randomized particle life spans. Animatable.