8.9.3.45 IfcPlacement
ABSTRACT This definition may not be instantiated
8.9.3.45.1 Semantic definition
An IfcPlacement is an abstract supertype of placement subtypes that define the location of an item, or an entire shape representation, and provide its orientation. All placement subtypes define right-handed Cartesian coordinate systems and do not allow mirroring.
Cartesian transformations including mirroring and scaling are supported by IfcCartesianTransformationOperator Definition according to ISO/CD 10303-42:1992 A placement locates a geometric item with respect to the coordinate system of its geometric context. It locates the item to be defined and, in the case of the axis placement subtypes, gives its orientation. Entity adapted from placement defined in ISO 10303-42. New entity in IFC1.08.9.3.45.2 Entity inheritance
-
- IfcPlacement
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.45.3 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 | |||
| IfcPlacement (2) | |||
| 1 | Location | IfcPoint |
The geometric position of a reference point, such as the center of a circle, of the item to be located. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, derived from the dimensionality of the location. |
8.9.3.45.4 Formal representation
ENTITY IfcPlacement
ABSTRACT SUPERTYPE OF (ONEOF
(IfcAxis1Placement
,IfcAxis2Placement2D
,IfcAxis2Placement3D
,IfcAxis2PlacementLinear))
SUBTYPE OF (IfcGeometricRepresentationItem);
Location : IfcPoint;
DERIVE
Dim : IfcDimensionCount := Location.Dim;
END_ENTITY;