An animation for a single property of the individual particles rendered by a particle system.
- iOS 8.0+
- macOS 10.10+
- tvOS 9.0+
- watchOS 2.0+
Use particle property controllers to change the properties of individual particles in an
SCNParticle object over time, with Core Animation semantics. For example, by associating a keyframe animation with a particle system’s
SCNParticle property, you can create a flame effect with particles that change from blue to white to orange as they rise.
A particle property controller animates a property of individual particles rendered by the particle system. By comparison, implicitly or explicitly animating properties of a
SCNParticle object affects the system as a whole. Consider the keyframe animation of colors described above—if you apply this animation directly to a particle system instead of using a property controller, all particles rendered by the system change color together instead of each one changing color as it rises.
Core Animation animations in SceneKit typically animate a change to a property as a function of time. By default, property controllers animate a particle property this way. However, by changing the
input property you can also create animations that animate a particle property as a function of distance from a specified node or of the value of another particle property. For example, you can use this option to make particles change color as they speed up and slow down.
For more details about particle systems and particle properties, see