xpDynamicParticles enables you to add and remove extra particles around the position of existing particles.

In addition, rather than just popping particles in and out, the modifier can fade them in or out over time by altering the particle radius.

The purpose of the modifier is to allow additional 'filler' particles to be added to a scene when needed, then removed when no longer required.

General tab

xpDynamicParticles General tab.

Enabled

Checking this box activates xpDynamicParticles.

Mode

Set at Independent, by default.

You can change this to Action-Controlled.

Independent Mode

In this mode, particles will be affected if they come into the field of effect of the modifier.

Action-Controlled Mode

When in the Action-Controlled Mode setting, the modifier will only act on a particle when told to do so by an action.

Spawning Emitter

Drop a second emitter, which will generate the dynamic particles, into this field.