Instance Property


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


@property(nonatomic) CGFloat particleAngularVelocityVariation;


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


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


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


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


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


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


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


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