Apple Motion 4 - Manual (Page 614)

3 To make the particles drift upward, drag in the middle of the Emission Range segment,
rotating the arrow counterclockwise until it points up and slightly to the right of the
center control.
The emission angle of the particles updates in the Canvas to reflect the new setting in
the HUD.
4 Drag to lengthen the arrow so that it is approximately halfway between the center and
the edge of the emission control to create a slowly drifting column of particles.
Remember: While the angle of the arrow controls the emission angle of the particles, the
length of the arrow controls the speed of the particles. The longer the arrow, the faster
the particles, and vice versa.
At this point, the particles are all moving in the correct direction, but there aren’t very
many of them (there isn’t much of a fire yet).
5 Move the Birth Rate slider to the right to increase the number of particles created by the
emitter.
614 Chapter 11 Working with Particles