It assigns UV value for pasting mapping image to the selected face.
Buttons of shape icon represent flat, cylinder, sphere and UV mapping respectively.
It operates a basic shape for assigning mapping.
It inverts each assigned direction of U and V.
It makes a basic shape of mapping fit to the selected face.
It makes a basic shape of mapping fit to the currently selected object.
It shows a dialog of a basic shape of mapping and sets up location, angle, and size in numerical values.
