2009

Basic Parameters rollout > Display Icon group
The emitter specifies the location where particles are generated in the scene.
It has a geometry you can display in viewports, but it isn't renderable.
The emitter is displayed as a rectangle with a vector pointing out of one side.
The vector shows the direction in which the system emits particles.
You set emitter parameters on the particle system's Basic Parameters rollout,
in the Display Icon group.
Width and Length You implicitly set the initial value of these parameters
when you drag in a viewport to create the emitter. You can adjust the values
on the rollout.
The space occupied by the particle system at any given time is the result of a
combination of its initial parameters (such as size of the emitter, and speed
and variation of emission) and any space warps that have been applied.
Emitter Hidden Hides the emitter in viewports. When off, the emitter is
displayed in viewports. The emitter is never rendered. Default=off.
3032 | Chapter 14 Space Warps and Particle Systems