xpCover causes the particles to either coat the surface or fill the volume of another object.

Once the object is coated/filled, the particles will stick to it and will move with the object if the object is moved during an animation.

In Target mode, the particles will head for the Target object (if Attract is selected) or be repelled from it; they will never stick to the object in this mode.

General tab

xpCover General tab menu.

Enabled

Checking this box activates xpCover.

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.

Type

Set as Velocity, by default.