Creates a hole in a polygon face, optionally
            in the shape of another face.
         
         
         Mesh > Make Hole
                  Tool >   
 
            
            Merge mode
               
               Using the First, Middle,
                  and Second merge modes, the center
                  of the stamp face is made to match with the center of the face the
                  hole is made on.
               
               The Project
                     Merge modes make the hole exactly where the stamp face resides.
                  These modes do not center the hole but align the hole flat with
                  the plane face. They also do not rotate the face to match the center
                  as with the First, Middle,
                  and Second merge modes.
               
               - First
- 
                     The face selected second
                           is transformed to make the centers match. The first selected face
                           does not get transformed.
                         
- Middle
- 
                     Both the first and the
                           second faces are transformed to make their centers match.
                         
- Second
- 
                     The face selected first
                           is transformed to make the centers match. The second selected face
                           does not get transformed.
                         
- Project First
- 
                     The second selected face
                           is projected onto the first and the centers do not match. The face
                           is not rotated, unlike the First merge mode where the face is rotated
                           to match the center.
                         
- Project Middle
- 
                     Both faces are projected
                           onto a plane lying between them; their centers do not necessarily match.
                         
- Project Second
- 
                     The first selected face
                           is projected onto the second selected face and the centers do not match.
                         
- None
- 
                     The stamp face projects
                           directly onto the face plane you select. This is the default. 
                         
Merge mode examples
               
               The following examples
                  show the difference between using the merge modes.