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Four different geometry methods are available for the creation of planar Morph shapes: Rectangular
or Rotated Rectangular, which create straight planar edges, the other two are Center point
and Radius and Circumference, which create curved planar edges.
With the Rectangular method you need to specify the two opposite nodes of the rectangle, and
an orthogonal Face with all four boundary edges will be created.
With the Rotated Rectangular method, you need to specify with two clicks the direction and
length of one side of the rectangle, then the length of the other side with a third
click. In this case a rotated Face with all four boundary edges will be created.
So with the Rectangular methods a Face is always created since we specify a closed polygon.
With the Center point and Radius method you first need to specify the center point of
the Arc or Circle, then the starting point of the Arc, and with the third click, the
End point of the Arc.
The Arc can be open or closed, which is achieved when the starting and end points of the Arc
are at the same point. In this case a circular Face and its boundary edge is created.
The Circumference method offers the same functionality, but in this case you need to specify three
points on the circumference of the Arc, then specify the end point of the Arc or Full Circle
with the fourth click.