IfcBoundingBox

BACnet MVD

#### IfcBoundingBox

Natural language names

| Umfassungskörper
| Bounding Box
| Boite englobante

##### 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 277, 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 277 — Bounding box |

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

> HISTORY New entity in IFC1.0.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
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 | B
--- | --- | --- | --- | --- | ---
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

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

`

References: IfcBoxedHalfSpace

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