Creates a brief particle flash roughly the size of the defining
brush each time it is triggered.
The class is designed for a group of func_particlefield entities which flash in a sequence. Set the “event” key to the same value for every func_particlefield in your group. Then use “cnt” to assign each func_particlefield an index between 0 and n-1, which determines the order in which they will fire.
The func_particlefield with index 0 is the master controller. Setting “wait” on this entity determines the time between each successive particle field flash.
The remaining fields can be set differently on each entity.
“color” is the color of the particles. Default is 192 (yellow).
“count” is the density of the particles. Default is 2.