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。

 

#AttributeTypeCardinalityDescriptionC
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;

 

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