8.9.3.70 IfcSurfaceOfLinearExtrusion
8.9.3.70.1 Semantic definition
The IfcSurfaceOfLinearExtrusion is a surface derived by sweeping a curve along a vector.
Informal Propositions:
- The surface shall not self-intersect
8.9.3.70.2 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
8.9.3.70.3 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. |
|
| 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. |
|
| IfcSurface (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item. |
| IfcSweptSurface (2) | |||
| 1 | SweptCurve | IfcProfileDef |
The curve to be swept in defining the surface. The curve is defined as a profile within the position coordinate system. |
| 2 | Position | OPTIONAL IfcAxis2Placement3D |
Position coordinate system for the swept surface, provided by a profile definition within the XY plane of the Position coordinates. If not provided, the position of the profile being swept is determined by the object coordinate system. In this case, the swept surface is not repositioned. |
| Click to show 5 hidden inherited attributes Click to hide 5 inherited attributes | |||
| IfcSurfaceOfLinearExtrusion (3) | |||
| 3 | ExtrudedDirection | IfcDirection |
The direction of the extrusion. |
| 4 | Depth | IfcLengthMeasure |
The depth of the extrusion, it determines the parameterization. |
| * | ExtrusionAxis | IfcVector |
This attribute is formally derived. The extrusion axis defined as vector. |
8.9.3.70.4 Formal propositions
8.9.3.70.5 Formal representation
ENTITY IfcSurfaceOfLinearExtrusion
SUBTYPE OF (IfcSweptSurface);
ExtrudedDirection : IfcDirection;
Depth : IfcLengthMeasure;
DERIVE
ExtrusionAxis : IfcVector := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector (ExtrudedDirection, Depth);
WHERE
DepthGreaterZero : Depth > 0.;
END_ENTITY;