- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Birth Direction Constant
The emitting direction is the same for all particles.
Birth Direction Surface Normal
The emitting direction for each particle is along the surface normal vector at the point where the particle is emitted.
Birth Direction Random
SceneKit randomizes the emitting direction for each particle.
The shape of the region of space where the system spawns new particles.
The possible locations for newly spawned particles, relative to the emitter shape.
The possible initial directions for newly spawned particles, relative to the emitter shape.
The initial direction for newly spawned particles. Animatable.
The range, in degrees, of randomized initial particle directions. Animatable.