3ds Max Modifiers - Face Extrude
The Face Extrude modifier extrudes faces along their normals, creating new faces along the sides of the extrusion that connect the extruded faces to their object. As with most modifiers, this affects the current face selection passed up the stack. There are various differences between the Face Extrude modifier and the Face Extrude function in an editable mesh, especially the fact that all parameters in the Face Extrude modifier are animatable.
My 2 Cents :The Face Extrude Modifier is used to procedurally extrude a selected sub-object face of an Editable mesh or Poly. This procedure is one that has pretty much become obsolete with the addition of the animate mode within an editable Poly. One of the drawbacks is the lack of units. Face Extrude however does work well when you want a single surface from a closed poly line. This can also be achieved by using an edit mesh or edit poly modifier but I'll use Face extrude sometimes to easily distinguish it in the modifier stack.
