xpLimit can limit the movement of particles by preventing them from moving in one or more planes.

General tab

xpLimit General tab menu.

Enabled

Checking this box activates xpLimit.

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.

Limit Positions

Check this box to enable position limiting.