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This section describes how to use alignment points and alignment point areas.
An alignment point is the origin of the coordinate system used for the devices inserted on the drawings. The location relative to the alignment point is used when exporting devices to an IFC file or calculating distances between devices.
It is important to choose a good location for your alignment point. Choose a point that will be easy to locate on all the floors of the building and that will not move during the course of the project. A corner of the building, a column, or the intersection of two architectural grids lines are all examples of good alignment point location choices.
Drawings can have more than one alignment point. The first alignment point inserted is used for all devices on the drawing. The second and following alignment points are inserted with boxes, called alignment point areas, around them. All devices in the alignment point area are associated with the corresponding alignment point. Any devices not inside an alignment point area are associated with the first alignment point.
The following example shows a drawing file with multiple alignment point areas and floor plans. Notice how alignment point areas are drawn around the second and third alignment points (labeled AP2 and AP 3).
The values that can be specified for alignment points are listed below.
Elevation: The elevation of the alignment point. All device elevations are relative to this elevation. Most often, this is the height of the floor.
For example, consider a second floor area with light fixtures. The elevation of the alignment point would be the height of the floor, 14'. The elevation of the light fixtures would be the elevation relative to the floor they are on, 8'. The height of the light fixtures when exported or used for distance calculations would be the sum of the two heights, 14' + 8' = 22'.
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