Instance Property

particleVelocityVariation

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

Declaration

@property(nonatomic) CGFloat particleVelocityVariation;

Discussion

Setting a nonzero value for this property randomizes the effect of the particleVelocity property. SceneKit randomly adjusts the initial speed of each particle by up to half the particleVelocityVariation value. For example, if the particleVelocity value is 10.0 units per second and the particleVelocityVariation value is 5.0 units per second, newly spawned particles have random velocities between 7.5 and 12.5 units per second.

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

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

See Also

Managing Particle Motion

particleAngle

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

particleAngleVariation

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

particleVelocity

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

particleAngularVelocity

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

particleAngularVelocityVariation

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

particleLifeSpan

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

particleLifeSpanVariation

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