IfcCardinalPointReference

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcCardinalPointReference			ADDED

Semantic definitions at the type

Type definition

An IfcCardinalPointReference is an index reference to significant points of a section profile. This index is used to describe the spatial relationship between the section of a member and a reference axis of the same member.

HISTORY New Type in IFC4.

Indexes 1...9 refer to points at the bounding box of a profile. Indexes 10...19 refer to points defined by geometric centroid (usually centre of gravity) and shear centre, and their combinations with bounding box coordinates. In particular, the following index values are specified in this specification:

bottom left
bottom centre
bottom right
mid-depth left
mid-depth centre
mid-depth right
top left
top centre
top right
geometric centroid
bottom in line with the geometric centroid
left in line with the geometric centroid
right in line with the geometric centroid
top in line with the geometric centroid
shear centre
bottom in line with the shear centre
left in line with the shear centre
right in line with the shear centre
top in line with the shear centre

Other index values are possible but outside the scope of this specification.

Figure 351 illustrates cardinal point values.

Figure 351 — Cardinal point values

Figure 352 illustrates an example extrusion shape with arbitrary profile (IfcArbitraryClosedProfileDef), aligned "mid-depth right" on the member axis. The line of sight follows the extrusion direction Z which points into the drawing plane of above illustration. Hence, "left" is in the positive X direction of the IfcProfileDef. "Top" is in the positive Y direction of the IfcProfileDef.

Figure 352 — Cardinal point extrusion

Rule	Description
GreaterThanZero	Cardinal point reference shall be greater than zero.

Formal representations

XSD Specification

 <xs:simpleType name="IfcCardinalPointReference">

  <xs:restriction base="xs:long"/>

 </xs:simpleType>

 <xs:element name="IfcCardinalPointReference-wrapper" nillable="true">

  <xs:complexType>

   <xs:simpleContent>

    <xs:extension base="ifc:IfcCardinalPointReference">

     <xs:attributeGroup ref="ifc:instanceAttributes"/>

    </xs:extension>

   </xs:simpleContent>

  </xs:complexType>

 </xs:element>

EXPRESS Specification


TYPE IfcCardinalPointReference = INTEGER;
 WHERE

  GreaterThanZero : SELF > 0
END_TYPE;


 EXPRESS-G diagram

	Bezug auf Einfügepunkte
	Cardinal Point Reference
	Référence à l'index d'un point significatif d'un profil