xpKill controls the removal of unwanted scene particles.

Object properties

Object tab menu for xpKill.

Enabled

Checking this box enables the xpKill modifier.

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 setting, the modifier will only act on a particle when told to do so by an action.

Volume

Set at Outside Bounds, by default, this parameter determines the nature of the bounding volume.

Other settings are: Inside Bounds, Objects, Outside Camera FOV and Clamp to Max Particles.

Inside Bounds