IfcPointOnSurface是由其定义曲面的两个参数值定义的点。
注：定义根据ISO/CD 10303-42:1992
IfcPointOnSurface是位于参数曲面上的点。该点是通过计算一对特定参数值的曲面来确定的。
注：实体改编自ISO 10303-42中_表面上的点。
IFC2x2中增加的新实体。
非正式提议：
●为u和v指定的参数值不得超出基础曲面的参数范围。
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| IfcRepresentationItem | |||||
| LayerAssignment | IfcPresentationLayerAssignment @AssignedItems |
S[0:1] | 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. | X | |
| StyledByItem | IfcStyledItem @Item |
S[0:1] | Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. | X | |
| IfcGeometricRepresentationItem | |||||
| IfcPoint | |||||
| IfcPointOnSurface | |||||
| 1 | BasisSurface | IfcSurface | [1:1] | The surface to which the parameter values relate. | X |
| 2 | PointParameterU | IfcParameterValue | [1:1] | The first parameter value of the point location. | X |
| 3 | PointParameterV | IfcParameterValue | [1:1] | The second parameter value of the point location. | X |
| Dim :=BasisSurface.Dim |
IfcDimensionCount | [1:1] | The space dimensionality of this class, determined by the space dimensionality of the basis surface. | X | |
EXPRESS Specification
ENTITY IfcPointOnSurface
SUBTYPE OF (IfcPoint);
BasisSurface : IfcSurface;
PointParameterU : IfcParameterValue;
PointParameterV : IfcParameterValue;
DERIVE
Dim : IfcDimensionCount := BasisSurface.Dim;
END_ENTITY;