IFC 4.3.0.1 (IFC4X3) development

8.7.3.5 IfcConnectionCurveGeometry

8.7.3.5.1 Semantic definition

IfcConnectionCurveGeometry is used to describe the geometric constraints that facilitate the physical connection of two objects at a curve or at an edge with curve geometry associated. It is envisioned as a control that applies to the element connection relationships.

The IfcCurve (or the IfcEdgeCurve with an associated IfcCurve) at the CurveOnRelatingElement attribute defines the curve where the basic geometry items of the connected elements connects. The curve geometry and coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnects subtype that utilizes the IfcConnectionCurveGeometry. Optionally, the same curve geometry and coordinates can also be provided within the local coordinate system of the RelatedElement by using the CurveOnRelatedElement attribute.

The available geometry for the connection constraint may be further restricted to only allow straight segments by applying IfcPolyline only. Such an usage constraint is provided at the object definition of the IfcElement subtype, utilizing the element connection by referring to the subtype of IfcRelConnects with the associated IfcConnectionCurveGeometry.

8.7.3.5.2 Entity inheritance

8.7.3.5.3 Attributes

# Attribute Type Description
IfcConnectionCurveGeometry (2)
1 CurveOnRelatingElement IfcCurveOrEdgeCurve

The bounded curve at which the connected objects are aligned at the relating element, given in the LCS of the relating element.

2 CurveOnRelatedElement OPTIONAL IfcCurveOrEdgeCurve

The bounded curve at which the connected objects are aligned at the related element, given in the LCS of the related element. If the information is omitted, then the origin of the related element is used.

Table 8.7.3.5.A

8.7.3.5.4 Formal representation

ENTITY IfcConnectionCurveGeometry
 SUBTYPE OF (IfcConnectionGeometry);
	CurveOnRelatingElement : IfcCurveOrEdgeCurve;
	CurveOnRelatedElement : OPTIONAL IfcCurveOrEdgeCurve;
END_ENTITY;

8.7.3.5.5 References

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