IfcGeometricCurveSet用于交换仅由(2D或3D)点和曲线集合组成的形状表示。
注:定义根据ISO/CD 10303-42:1992
几何曲线集是二维或三维点和曲线的集合。
注:实体改编自ISO 10303-42中定义的几何曲线集。
IFC2x2中增加的新实体。
Formal Propositions
Rule | Description |
NoSurfaces | No surface shall be included in this geometric set. |
# | Attribute | Type | Cardinality | Description | C |
| 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 |
1 | Elements | S[1:?] | The geometric elements which make up the geometric set, these may be points, curves or surfaces; but are required to be of the same coordinate space dimensionality. | X | |
| Dim :=Elements[1].Dim | [1:1] | The space dimensionality of this class, it is identical to the first element in the set. A where rule ensures that all elements have the same dimensionality. | X | |
EXPRESS Specification
ENTITY IfcGeometricCurveSet
SUBTYPE OF (IfcGeometricSet);
WHERE
NoSurfaces : SIZEOF(QUERY(Temp <* SELF\IfcGeometricSet.Elements | 'IFCGEOMETRYRESOURCE.IFCSURFACE' IN TYPEOF(Temp))) = 0;
END_ENTITY;