The duration, in seconds, over which the system spawns new particles. Animatable.
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 3.0+
A duration of
0 specifies that all particles (the value of the
birth property) spawn instantaneously. Use this duration to create randomized static effects in your scene. For example, by combining this option with the
image properties, you can cover a plane with a variety of sprites, creating the appearance of a grassy field.
The default value is
You can animate changes to this property’s value. See Animating SceneKit Content.