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Bounding boxes rotating with elements
General purposes of the bounding box
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If a family does not have a family origin explicitly defined, the origin will default to the center of the
bounding box. This origin affects placement of instances and their behavior when the instance type or
family is changed. For detailed information about family origins, see
on page 418.
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The bounding box helps define the joining and cutback of structural framing elements.
Curved Beams
Curved beams present a unique instance of the bounding box. The bounding box bends to meet the needs
of the beam. This provides accurate joining and cutback with the beam.
Beam to Column Joins
The following illustration shows an example of a beam that is not centered on a column. The beam handle
of the beam in the illustration remains within a bounding box. Remember, the bounding box is not visible.
If the column is moved slightly, but not completely out of its existing bounding box, the beam handle
remains in position, unaffected by column movement.
864 | Chapter 14 Structural Modeling
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