The xpTriggerAction modifier will trigger an Action while a particle is in its field of effect.

This lets you trigger actions in certain parts of the 3D world without any other effect on the particle.

You can also use it to turn action-controlled modifiers on or off without using an action.

General tab

xpTriggerAction General tab menu.

Enabled

Checking this box enables the xpTriggerAction 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 Mode setting, the modifier will only act on a particle when told to do so by an action.

Operation

Set as Falloff>=, by default.

The alternative settings are: Falloff Range and Falloff <=.

Falloff >=

The modifier's falloff value at the particle's position must be equal to, or greater than, the value in the Low Falloff Value parameter.