Screenshots 
 A standard 3-axis portal mill: 
 A Staeubli RX90 robot with a milling head: 
(Note to self: there are more colors besides grey!)
 The tool definition window: 
 A generated cutaway-area (debugging output): 
If the tool moves from one point to another the area that is cut away
is calculated. This object can then be used in CSG operations.