OWARC                                                      Menu: (MWALS) MWEDT
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Creates openings in multi-layer wall arcs.

         1.  (IND) wall to insert opening
         2.  (Y/N) confirm choice
         3.  (NUM) opening height (greater than 0)
         4.  (NUM) opening height above floor (0 or greater)
         5.* (Y/N) positioning option: y - radial n - parallel <y>
      if reply is `n':
         6.* (NUM) paral. pos. by: 1-pt. & length, 2-pt. & half-length,
                                                           3-pt. & angle <1>
      for option 1:
         7.* (POINT) start point of opening
         8.* (IND) side of opening
         9.* (NUM)   length of chord (greater than 0)
      for option 2:
         7.* (POINT) middle point of opening
         8.* (NUM) length of half chord (greater than 0)
      for option 3:
         7.* (POINT) start point of opening
         8.* (NUM) angle of opening (+/- 0.1-360)
      if reply to prompt 5 is `y':
         7.* (POINT) first point of opening
         8.* (POINT) second point of opening

Description

This command allows you to create simple openings in multi-layer wall arcs.
The openings may have parallel or radial sides (jambs).  These openings cut
the internal layers of the wall with a single straight line without the
application of special end conditions or opening symbols.

The openings should be created while the walls are two dimensional.  If you
insert them after a 3D projection of the wall has been created, the wall will
appear in 2D only.  In order to see the 3D opening, you will have to delete
the 3D model of the walls (\mw2d) and then recreate them (\mw3d).

Indicate and confirm the wall in which the opening is to be inserted.  Specify
the opening height and the height of the opening from the base of the wall.
State whether the opening sides (jambs) are to be parallel to each other (and
to an imaginary radial line that bisects the width of the opening) or radial
from the center of the arc.

If the opening is to have parallel sides you are offered three options:

         specify a starting point, direction and chord length the opening
         width will be measured along a straight line

         specify a center point and half the chord length the opening width
         will be measured along a straight line symmetrically about the
         specified center point

         specify a starting point and angle (counterclockwise = positive value
         clockwise = negative value)

If the opening is to be radial, specify the starting and end point of the
opening.

The system will ask you to place other openings in the same wall until you
execute a new command.

NOTE 1: Unlike linear multi-layer walls, it is not possible to define an arc
opening with end condition details.
NOTE 2: The maximum number of openings allowed in a single wall is 30.
