8.7.3.9 IfcConnectionSurfaceGeometry

8.7.3.9.1 Semantic definition

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

The IfcSurface (or the IfcFaceSurface with an associated IfcSurface) at the SurfaceOnRelatingElement attribute defines the surface where the basic geometry items of the connected elements connects. The surface geometry and coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnects subtype that utilizes the IfcConnectionSurfaceGeometry. Optionally, the same surface geometry and coordinates can also be provided within the local coordinate system of the RelatedElement by using the SurfaceOnRelatedElement attribute.

8.7.3.9.2 Entity inheritance

1. • IfcConnectionGeometry
2. • IfcConnectionSurfaceGeometry
   • IfcConnectionCurveGeometry
   • IfcConnectionPointGeometry
   • IfcConnectionVolumeGeometry

8.7.3.9.3 Attributes

#	Attribute	Type	Description
IfcConnectionSurfaceGeometry (2)
1	SurfaceOnRelatingElement	IfcSurfaceOrFaceSurface	Surface at which related object is aligned at the relating element, given in the LCS of the relating element.
2	SurfaceOnRelatedElement	OPTIONAL IfcSurfaceOrFaceSurface	Surface at which the relating element is 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.

8.7.3.9.4 Formal representation

ENTITY IfcConnectionSurfaceGeometry
 SUBTYPE OF (IfcConnectionGeometry);
	SurfaceOnRelatingElement : IfcSurfaceOrFaceSurface;
	SurfaceOnRelatedElement : OPTIONAL IfcSurfaceOrFaceSurface;
END_ENTITY;

8.7.3.9.5 References

• IfcConnectionGeometry