IFC (IFC4X3) development IfcBoundingBox 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.

bounding box
Figure — Bounding box

As shown in Figure, 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). Entity inheritance 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.

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.

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.


The space dimensionality of this class, it is always 3.

Table Examples Formal representation

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

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