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Walls junctions clean up to each other based on various rules:
A 2D graphic overlay, created from a marqueed area using the Document menu > Annotation > Create Patch command.
It is an Object with purely 2D information, initially set to match the appearance of the existing Plan elements. It can be edited by selecting the Patch and using the File menu > Libraries and Objects > Open Object command, then clicking on 2D Symbol in the sidebar. Edit the linework and/or fills, then Save and the Patch will change on the floor plan.
Patches can be used once for unique cases, or created and used multiple times for repeated situations (and can be mirrored or rotated if necessary). Add hotspots to the 2D Symbol to facilitate precise placement.
Walls that terminate without meeting another wall can be fine-tuned graphically by using the Wall End tool. The Wrapped End object is the most common application, however other options are available for different design requirements, including Bull Nose, Pointed, Chamfered, Cased and Returned.
Walls also have a setting for End Lines that allows you to remove terminating lines when appropriate.
Trapezoid options allow walls to transition smoothly from one thickness to another. The option is available for Basic Walls as well as Composites.
Polygonal Walls are drawn in a similar way to other polygon elements (e.g. slabs, fills) however they can clean up to other walls. They are useful for complex intersections, although limited since they are only one Building Material.