The number of particles spawned during each emission period. Animatable.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 3.0+
The system emits this number of particles at a constant rate through the duration of the period specified by the
emission property. A value of zero prevents the system from emitting particles, unless you randomize the birth rate with the
The default value is
You can animate changes to this property’s value. See Animating SceneKit Content.