8.9.3.49 IfcPointOnCurve
8.9.3.49.1 Semantic definition
The IfcPointOnCurve is a point defined by a parameter value of its defining curve.
Definition according to ISO/CD 10303-42:1992 A point on curve is a point which lies on a curve. The point is determined by evaluating the curve at a specific parameter value. The coordinate space dimensionality of the point is that of the basis curve. Entity adapted from point_on_curve in ISO 10303-42. New entity in IFC2x2.Informal Propositions
- The value of the point parameter shall not be outside the parametric range of the curve.
8.9.3.49.2 Entity inheritance
-
- IfcPoint
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.49.3 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. |
|
| IfcPoint (1) | |||
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases. |
| Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes | |||
| IfcPointOnCurve (2) | |||
| 1 | BasisCurve | IfcCurve |
The curve to which point parameter relates. |
| 2 | PointParameter | IfcParameterValue |
The parameter value of the point location. |
8.9.3.49.4 Formal representation
ENTITY IfcPointOnCurve
SUBTYPE OF (IfcPoint);
BasisCurve : IfcCurve;
PointParameter : IfcParameterValue;
END_ENTITY;