8.8.3.6 IfcBoundingBox
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.
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 simplest 3D shape representation.
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).
Corresponding STEP type box_domain defined in ISO 10303-42. New entity in IFC1.0.8.8.3.6.2 Entity inheritance
-
- IfcBoundingBox
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
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. The inverse attribute LayerAssignments has been added. 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. 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. The space dimensionality of this class, it is always 3. |
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;