xpChangeGroup changes the group number of a particle.

This modifier always causes the group number to be changed, but optionally a number of other particle parameters (color, display type, etc.) can also be changed.

General tab

xpChangeGroup General tab menu.

Enabled

Chck this box to enable the xpChangeGroup modifier.

Mode

Independent is the default setting.

Alternatively, 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.

Threshold

When the modifier is using fields, the effect of the modifier is dependent on a particle’s position within the field.

Threshold is a user-designated point between the start of the field and the field's inner offset.