8.8.3.6 IfcBoundingBox

RV ⓘ

AbV ⓘ

8.8.3.6.1 Semantic 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.

As shown in Figure 8.8.3.6.A, 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 coordinate system).

8.8.3.6.2 Entity inheritance

8.8.3.6.3 Attributes

#	Attribute	Type	Description
IfcRepresentationItem (2)
	LayerAssignment	SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems	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.
	StyledByItem	SET [0:1] OF IfcStyledItem FOR Item	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.
Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes
IfcBoundingBox (5)
1	Corner	IfcCartesianPoint	Location of the bottom left corner (having the minimum values).
2	XDim	IfcPositiveLengthMeasure	Length attribute (measured along the edge parallel to the X Axis)
3	YDim	IfcPositiveLengthMeasure	Width attribute (measured along the edge parallel to the Y Axis)
4	ZDim	IfcPositiveLengthMeasure	Height attribute (measured along the edge parallel to the Z Axis).
*	Dim	IfcDimensionCount	This attribute is formally derived. `3` The space dimensionality of this class, it is always 3.

Table 8.8.3.6.B

8.8.3.6.4 Formal representation

ENTITY IfcBoundingBox
 SUBTYPE OF (IfcGeometricRepresentationItem);
	Corner : IfcCartesianPoint;
	XDim : IfcPositiveLengthMeasure;
	YDim : IfcPositiveLengthMeasure;
	ZDim : IfcPositiveLengthMeasure;
 DERIVE
	 Dim : IfcDimensionCount := 3;
END_ENTITY;