5

4 In the Emitter HUD, drag the Birth Rate slider to the right to increase the number of
particles created by the emitter.
As you increase the birth rate, more particles are created, forming a nearly unified column
of “smoke.” The particles move farther apart as they drift away from the emitter.
As you can see, a single object can be used to create a credible column of smoke rising
gently into the sky.
Although the HUD controls are quite powerful, the Emitter and Particle Cell panes in the
Inspector have many more parameters you can customize. For more information, see
Emitter and Cell Parameters.
Emitter HUD Parameters
The HUD contains the most frequently used emitter controls necessary to modify a particle
system’s size and shape. These parameters are a subset of those found in the Emitter
Inspector. In 2D projects, the Emitter HUD contains a group of sliders and the emission
control, which provides a visual way to manipulate three particle system parameters:
Emission Range, Emission Angle, and Speed.
Emission range
Emission angle (angle of
arrow) and speed (length
of arrows)
680 Chapter 14 Working with Particles