Apple Motion 3 - Manual (Page 699)

Chapter 8 Working with Particles 699
 Shift (while adjusting Range): When working with a 2D emitter, restricts to 22.5-
degree increments.
 Command: When working with a 2D emitter, adjusts Angle only.
 Option: When working with a 2D emitter, adjusts Speed only.
 Emission Latitude/Emission Longitude (3D only): When using a 3D particle emitter
(when 3D is turned on in the Emitter tab of the Inspector), the emission control of
the HUD lets you modify the Emission Latitude and Emission Longitude.
Drag the sphere in the center of the circle to modify the emission direction (in degrees
latitude and longitude) of the particles. You can also enter specific values in the Emitter
tab of the Inspector.
Drag the Emission Range slider (above the sphere) to define the range of degrees at
which particles are generated. In other words, this control defines the size of the cone
that the particles fill when generated in 3D space.
Emission Latitude and Longitude