IfcBoundingBox

Semantic definitions at the entity

Entity definition

The IfcBoundingBox defines an orthogonal box oriented parallel to the axes of the object coordinate system in which it is defined. It is defined by a Corner being a three-dimensional Cartesian point and three length measures defining the X, Y and Z parameters of the box in the direction of the positive axes.

NOTE Any subtype of IfcProduct having a product shape representation may have a bounding box representation. The 'Box' representation identifier defined at IfcShapeRepresentation utilizes the IfcBoundingBox as the simpliest 3D shape representation.

	As shown in Figure 322, the IfcBoundingBox is defined with its own location which can be used to place the IfcBoundingBox relative to the geometric coordinate system. The IfcBoundingBox is defined by the lower left corner (Corner) and the upper right corner (XDim, YDim, ZDim measured within the parent co-ordinate system).
Figure 322 — Bounding box

NOTE Corresponding STEP type box_domain defined in ISO 10303-42.

HISTORY New entity in IFC1.0.

Attribute definitions

#	Attribute	Type	Description	G
1	Corner	IfcCartesianPoint	Location of the bottom left corner (having the minimum values).	X
2	XDim	IfcPositiveLengthMeasure	Length attribute (measured along the edge parallel to the X Axis)	X
3	YDim	IfcPositiveLengthMeasure	Width attribute (measured along the edge parallel to the Y Axis)	X
4	ZDim	IfcPositiveLengthMeasure	Height attribute (measured along the edge parallel to the Z Axis).	X
	Dim :=3	IfcDimensionCount	The space dimensionality of this class, it is always 3.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items. IFC2x3 CHANGE The inverse attribute LayerAssignments has been added. IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcBoundingBox
1	Corner	IfcCartesianPoint		Location of the bottom left corner (having the minimum values).	X
2	XDim	IfcPositiveLengthMeasure		Length attribute (measured along the edge parallel to the X Axis)	X
3	YDim	IfcPositiveLengthMeasure		Width attribute (measured along the edge parallel to the Y Axis)	X
4	ZDim	IfcPositiveLengthMeasure		Height attribute (measured along the edge parallel to the Z Axis).	X
	Dim :=3	IfcDimensionCount		The space dimensionality of this class, it is always 3.	X

Formal representations

XML Specification

 <xs:element name="IfcBoundingBox" type="ifc:IfcBoundingBox" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>

 <xs:complexType name="IfcBoundingBox">

  <xs:complexContent>

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

    <xs:sequence>

     <xs:element name="Corner" type="ifc:IfcCartesianPoint" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="XDim" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="YDim" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="ZDim" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcBoundingBox

 SUBTYPE OF (IfcGeometricRepresentationItem);

  Corner : IfcCartesianPoint;

  XDim : IfcPositiveLengthMeasure;

  YDim : IfcPositiveLengthMeasure;

  ZDim : IfcPositiveLengthMeasure;

 DERIVE

  Dim : IfcDimensionCount := 3;

END_ENTITY;

 EXPRESS-G diagram

	Umfassungskörper
	Bounding Box
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