 WAL3D                                                      Menu: (MWALS) MWUTL
 ==============================================================================
 Displays a 3-dimensional model of a single multi-layer wall or opening.

         1. * (IND) wall/opening to display in 3D
         2. * (Y/N) confirm choice
      if a wall arc is indicated:
         3. * (Y/N) wish to display the vertices of wall/opening arcs ? <y>
      if you reply `y':
         4. * (NUM) number of segments for 3D display of arcs (3-25) <10>

 Description:
 This command turns a single 2-dimensional wall or opening into
 a three-dimensional model.
 Indicate and confirm the wall/opening to display in 3D. If you indicate
 a linear wall/opening, the system will display it immediately in 3D. If you
 indicate a wall arc, the system will ask if you wish to display the arc by
 vertices or build the 3D display using only its surface contours. If `y' is
 replied, enter the number of vertices each surface will contain. Small arcs
 need to be divided into only a few segments, but if the arc is long, you may
 need more segments for the 3D display. You may define 3 to 25 segments for
 each wall arc.
 The system asks for walls/openings to display in 3D until you execute a new
 command.
