IfcConnectionPointEccentricity

Definition from IAI: The IfcConnectionPointEccentricity is used to describe the geometric constraints that facilitate the physical connection of two objects at a point or vertex point with associated point coordinates. There is a physical distance, or eccentricity, between the connection points of both object. The eccentricity can be either given by:

- providing the PointOnRelatingElement and the PointOnRelatedElement, where both point coordinates are not identical within a common parent coordinate system (latestly within the world coordinate system),
- providing the PointOnRelatingElement and the three distance measures, EccentricityInX, EccentricityInY, and EccentricityInZ (or only EccentricityInX, and EccentricityInY if the underlying coordinate system is two-dimensional), or
- providing both.

> NOTE If both, PointOnRelatedElement, and EccentricityInX, EccentricityInY, (EccentricityInZ) are provided, the values should be consistent. In case of any non-consistency, the calculated distance between PointOnRelatingElement and PointOnRelatedElementtakes precedence.

> HISTORY New entity in IFC 2x Edition 3.

Geometry Use Definitions:

The IfcPoint (or the IfcVertexPoint with an associated IfcPoint) at the PointOnRelatingElement attribute defines the point where the basic geometry items of the connected elements connects. The point coordinates are provided within the local coordinate system of the RelatingElement, as specified at the IfcRelConnectsSubtype that utilizes the IfcConnectionPointGeometry. Optionally, the same point coordinates can also be provided within the local coordinate system of the RelatedElement by using the PointOnRelatedElement attribute, otherwise the distance to the point at the RelatedElement has to be given by the three eccentricity values.

EXPRESS specification:

ENTITY IfcConnectionPointEccentricity
SUBTYPE OF ( | IfcConnectionPointGeometry);
EccentricityInX | : | OPTIONAL IfcLengthMeasure;
EccentricityInY | : | OPTIONAL IfcLengthMeasure;
EccentricityInZ | : | OPTIONAL IfcLengthMeasure;
END_ENTITY;

Attribute definitions:

EccentricityInX | : | Distance in x direction between the two points (or vertex points) engaged in the point connection.
EccentricityInY | : | Distance in y direction between the two points (or vertex points) engaged in the point connection.
EccentricityInZ | : | Distance in z direction between the two points (or vertex points) engaged in the point connection.

Inheritance graph

ENTITY IfcConnectionPointEccentricity;
ENTITY IfcConnectionGeometry;
ENTITY IfcConnectionPointGeometry;
PointOnRelatingElement | : | IfcPointOrVertexPoint;
PointOnRelatedElement | : | OPTIONAL IfcPointOrVertexPoint;
ENTITY IfcConnectionPointEccentricity;
EccentricityInX | : | OPTIONAL IfcLengthMeasure;
EccentricityInY | : | OPTIONAL IfcLengthMeasure;
EccentricityInZ | : | OPTIONAL IfcLengthMeasure;
END_ENTITY;