The speed at which a particle rotates, expressed in radians per second.
- iOS 7.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 3.0+
This is uniform for all particles generated by the emitter. The default value is
Adjusting a Particle’s Rotation
The average initial rotation of a particle, expressed as an angle in radians.
The range of allowed random values for a particle’s initial rotation, expressed as an angle in radians.