8.9.3.50 IfcPointOnSurface
8.9.3.50.1 Semantic definition
The IfcPointOnSurface is a point defined by two parameter value of its defining surface.
Definition according to ISO/CD 10303-42:1992 A point on surface is a point which lies on a parametric surface. The point is determined by evaluating the surface at a particular pair of parameter values. Entity adapted from point_on_surface in ISO 10303-42. New entity in IFC2x2.Informal Propositions
- The parametric values specified for u and v shall not be outside the parametric range of the basis surface.
8.9.3.50.2 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
8.9.3.50.3 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 | |||
| IfcPointOnSurface (3) | |||
| 1 | BasisSurface | IfcSurface |
The surface to which the parameter values relate. |
| 2 | PointParameterU | IfcParameterValue |
The first parameter value of the point location. |
| 3 | PointParameterV | IfcParameterValue |
The second parameter value of the point location. |
8.9.3.50.4 Formal representation
ENTITY IfcPointOnSurface
SUBTYPE OF (IfcPoint);
BasisSurface : IfcSurface;
PointParameterU : IfcParameterValue;
PointParameterV : IfcParameterValue;
END_ENTITY;