8.9.3.64 IfcSineSpiral
8.9.3.64.1 Semantic definition
A type of spiral curve for which the curvature change is dependent on the sine function. It is also known as the Klein curve.
The curvature is defined as:
K = K0 (s LinearTerm - 1/2&pi sin2&pi/SineTerm)
8.9.3.64.2 Entity inheritance
-
- IfcCurve
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.64.3 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. |
|
| IfcCurve (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. |
| IfcSpiral (1) | |||
| 1 | Position | IfcAxis2Placement |
No description available. |
| Click to show 4 hidden inherited attributes Click to hide 4 inherited attributes | |||
| IfcSineSpiral (3) | |||
| 2 | SineTerm | IfcLengthMeasure |
No description available. |
| 3 | LinearTerm | OPTIONAL IfcLengthMeasure |
No description available. |
| 4 | ConstantTerm | OPTIONAL IfcLengthMeasure |
No description available. |
8.9.3.64.4 Formal representation
ENTITY IfcSineSpiral
SUBTYPE OF (IfcSpiral);
SineTerm : IfcLengthMeasure;
LinearTerm : OPTIONAL IfcLengthMeasure;
ConstantTerm : OPTIONAL IfcLengthMeasure;
END_ENTITY;