4.1.7.1.1.3 Alignment Geometry - Horizontal, Vertical and Cant

This concept template applies to alignments defined by an horizontal, a vertical and a cant layouts.

For the IfcCompositeCurve: * RepresentationIdentifier = 'FootPrint' * RepresentationType = 'Curve2D'

For the IfcSegmentedReferenceCurve: * RepresentationIdentifier = 'Axis' * RepresentationType = 'Curve3D'

When defining the list of segments for the business logic (i.e., IfcAlignmentHorizontalSegment, IfcAlignmentVerticalSegment, IfcAlignmentCantSegment):

1. A zero-length segment shall be added, at the end of the list of segments for IfcAlignmentSegment.DesignParameters.
2. If the geometry definition is also present, then each of the zero-length segments shall have a IfcCurveSegment counterpart - of length zero.

The following diagram shows the generic classes and relationships used when applying this concept. In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.

General Usage

ApplicableEntity
IfcAlignment