IfcCsgPrimitive3D

IfcCsgPrimitive3D是所有三维原型的抽象超类型，用作树根项或CSG实体模型中的布尔结果。所有三维CSG基元都是在三维放置坐标系中定义的。

#	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
IfcCsgPrimitive3D
1	Position	IfcAxis2Placement3D	[1:1]	The placement coordinate system to which the parameters of each individual CSG primitive apply.	X
	Dim :=3	IfcDimensionCount	[1:1]	The space dimensionality of this geometric representation item, it is always 3.	X

EXPRESS Specification

ENTITY IfcCsgPrimitive3D
 ABSTRACT SUPERTYPE OF(ONEOF(IfcBlock, IfcRectangularPyramid, IfcRightCircularCone, IfcRightCircularCylinder, IfcSphere))
 SUBTYPE OF (IfcGeometricRepresentationItem);
  Position : IfcAxis2Placement3D;
 DERIVE
  Dim : IfcDimensionCount := 3;
END_ENTITY;