Customizing a Particle System Emitter
When you create an emitter, the particle system starts working according to the default
parameters in its Emitter and Particle Cell Inspectors. You can use the Emitter HUD to
easily change the most important of these parameters to suit your needs.
To display the HUD for a particle emitter
µ
Select the emitter.
The HUD appears when you select the emitter. If the HUD does not appear, press F7.