orientationMode
The mode defining whether and how particles may rotate.
Declaration
var orientationMode: SCNParticleOrientationMode { get set }Discussion
A particle’s angle (or orientation) is independent from its direction of motion. For example, a smoke effect may use a small image of a cloud for each particle, which stays at the same angle as the smoke rises, but a snow effect may use an image that flips and rotates as each snowflake falls.
For possible orientation modes, see SCNParticleOrientationMode. The default value is SCNParticleOrientationMode.billboardScreenAligned.