Faces global north.
Seemingly identical to UnkNorth?
Faces away from the camera plane, the same direction as the camera itself.
Faces in the direction the particle is moving. This direction can be modified by DirectionSpread actions, and is initially the particle's InitialDirection.
Faces global north.
Seemingly identical to North?
Tries to face the camera, but is limited to rotation around the vertical global Y-axis.
Values representing different orientation modes for RichModel particles.