8.9.3.31 IfcElementarySurface
ABSTRACT This definition may not be instantiated
8.9.3.31.1 Semantic definition
An IfcElementarySurface in the common supertype of analytical surfaces.
Definition according to ISO/CD 10303-42:1992 An elementary surface (IfcElementarySurface) is a simple analytic surface with defined parametric representation. Entity adapted from elementary_surface defined in ISO 10303-42. New entity in IFC1.58.9.3.31.2 Entity inheritance
-
- IfcSurface
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.31.3 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. |
|
| IfcSurface (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item. Derived attribute promoted from subtypes. |
| Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes | |||
| IfcElementarySurface (1) | |||
| 1 | Position | IfcAxis2Placement3D |
The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface. |
8.9.3.31.4 Formal representation
ENTITY IfcElementarySurface
ABSTRACT SUPERTYPE OF (ONEOF
(IfcCylindricalSurface
,IfcPlane
,IfcSphericalSurface
,IfcToroidalSurface))
SUBTYPE OF (IfcSurface);
Position : IfcAxis2Placement3D;
END_ENTITY;