Requested support of IfcEllipse for profile definitions

Based on          IFC2x3

Initiator            ISG Meeting-Berlin

Effects              Extended Coordination View

Date                    2006 02 24


Ellipses are supported for export/import of profile geometry as used in the definition of building elements or openings. There is no requirement for maintaining ellipse definitions for re-export (no roundtrip guarantee). An imported ellipse may be exported as a faceted polyline or a composite curve based on arc segments.

The following entities to define an ellipse are supported:

* IfcArbitraryClosedProfileDef.OuterCurve = IfcEllipse

* IfcArbitraryClosedProfileDef.OuterCurve = IfcCompositeCurve with segments based on IfcEllipse 

    * same for IfcArbitraryClosedProfileDefWithVoids.InnerCurves

* IfcEllipseProfileDef

Beside for the support of profile definitions, an ellipse may also be used within an IfcGeometricSet or IfcGeometricCurveSet. Therefore IfcEllipse is also supported as part of a 2D representation of IfcAnnotation

NOTE [2010-03-01]: Annotations are not part of the Coordination View Version 2.0 scope, but part of a separate Annotation add-on view

NOTE: ellipse (or elliptical arc) is not supported as an axis for an IfcWallStandardCase

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