Apple Motion 3 - Manual (Page 697)

Chapter 8 Working with Particles 697
When 3D is enabled in the Emitter tab of the Inspector, the Emitter HUD offers
additional 3D controls. In 3D, the emission control modifies the Emission Latitude and
Emission Longitude parameters.
When an emitter and the Adjust 3D Transform tool (in the Toolbar) are selected, the 3D
Emitter HUD expands to display additional controls that allow you to transform the
emitter in X, Y, and Z space, regardless of whether the group containing the emitter is
2D or 3D.
For more information on using the 3D transform controls in the HUD, see “ 3D
Compositing ” in the Motion Supplemental Documentation PDF.
3D Emitter HUD
Emission control