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Outer Boundary represents the perimeter of the structure
under consideration. Inner Boundaries represent boundary of
openings, if any, in the structure. Inner Boundaries
should not be outside the Outer Boundary. You are allowed to
create only one Outer Boundary, but you can create as many Inner
Boundaries as you need.
In CAST, both boundary types are represented by closed, non-intersecting polygons.
Their functions are to place STM Nodes which carry Bearing
Plates, Point loads, or Supports. Only one STM Element is
allowed to frame into STM Nodes placed on the Boundaries.
The Outer Boundary is created through the 
(Draw
Outer D-Region Boundary) button or by clicking the Construct
menu, pointing to Boundaries, and then clicking Outer.
The Inner Boundaries are created through the 
(Draw Inner D-Region Boundaries) button or by clicking
the Construct menu, pointing to Boundaries, and
then clicking Inner. Both Outer and Inner Boundaries can
be edited (add/remove corners, move corner or entire boundary
positions) through the 
(Edit D-Region Boundaries) button.
The Inner Boundaries cannot be created before the Outer
Boundary. The
and
buttons will be disabled before the Outer Boundary is created.
After the Outer Boundary is created, the
button will be disabled.
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