8.9.3.71 IfcSurfaceOfRevolution
8.9.3.71.1 Semantic definition
The IfcSurfaceOfRevolution is a surface derived by rotating a curve about an axis.
Informal Propositions:
- The surface shall not self-intersect
- The swept curve shall not be coincident with the axis line for any finite part of its length.
8.9.3.71.2 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
8.9.3.71.3 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 | |||
| IfcSurfaceOfRevolution (2) | |||
| 3 | AxisPosition | IfcAxis1Placement |
A point on the axis of revolution and the direction of the axis of revolution. |
| * | AxisLine | IfcLine |
This attribute is formally derived. The line coinciding with the axis of revolution. |
8.9.3.71.4 Formal representation
ENTITY IfcSurfaceOfRevolution
SUBTYPE OF (IfcSweptSurface);
AxisPosition : IfcAxis1Placement;
DERIVE
AxisLine : IfcLine := IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcCurve() || IfcLine(AxisPosition.Location,
IfcRepresentationItem() || IfcGeometricRepresentationItem () || IfcVector(AxisPosition.Z,1.0));
END_ENTITY;