The UVW Mapping Clear modifier is added to an object's modifier stack when you clear a channel with the Channel Info utility. You can also add the modifier explicitly by choosing it from the Modifier List.
To merge the results of the deletion into the object's geometry, collapse the modifier stack after deleting.
Specifies the map channel to clear. This is equivalent to clearing a specific channel in the Channel Info utility. If the specified map channel doesn't exist, the modifier has no effect.