实体定义：

分析曲面的公共超类型中的一个ifcelementary曲面。

注：定义根据ISO/CD 10303-42:1992

定义了一个简单的解析曲面。

注：实体改编自ISO 10303-42中定义的基本表面。

IFC1.5中增加的新实体

 

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
1	Position	IfcAxis2Placement3D	[1:1]	The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.	X

 

 

 

 

 

#	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
IfcSurface
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of IfcSurface. It is always a three-dimensional geometric representation item.	X
IfcElementarySurface
1	Position	IfcAxis2Placement3D	[1:1]	The position and orientation of the surface. This attribute is used in the definition of the parameterization of the surface.	X

 

EXPRESS Specification

ENTITY IfcElementarySurface
 ABSTRACT SUPERTYPE OF(ONEOF(IfcCylindricalSurface, IfcPlane))
 SUBTYPE OF (IfcSurface);
  Position : IfcAxis2Placement3D;
END_ENTITY;