IfcCsgPrimitive3D

Natural language names
CSG - Primitiv (3D)
Constructive Solid Geometry Primitive 3D
Primitive 3D Csg
Semantic definitions at the entity
Entity definition

IfcCsgPrimitive3D is an abstract supertype of all three dimensional primitives used as either tree root item, or as Boolean results within a CSG solid model. All 3D CSG primitives are defined within a three-dimensional placement coordinate system.

HISTORY  New entity in IFC2x3.

Attribute definitions
#AttributeTypeCardinalityDescription G
1PositionIfcAxis2Placement3D The placement coordinate system to which the parameters of each individual CSG primitive apply. X
Dim
:=3
IfcDimensionCountThe space dimensionality of this geometric representation item, it is always 3. X
Inherited definitions from supertypes
Entity inheritance IfcBlock IfcRectangularPyramid IfcRightCircularCone IfcRightCircularCylinder IfcSphere IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
X
StyledByItemIfcStyledItem
@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.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
X
IfcGeometricRepresentationItem
IfcCsgPrimitive3D
1PositionIfcAxis2Placement3D The placement coordinate system to which the parameters of each individual CSG primitive apply. X
Dim
:=3
IfcDimensionCountThe space dimensionality of this geometric representation item, it is always 3. X
Formal representations
XML Specification
 <xs:element name="IfcCsgPrimitive3D" type="ifc:IfcCsgPrimitive3D" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcCsgPrimitive3D" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcGeometricRepresentationItem">
    <xs:sequence>
     <xs:element name="Position" type="ifc:IfcAxis2Placement3D" nillable="true"/>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcCsgPrimitive3D
 ABSTRACT SUPERTYPE OF(ONEOF(IfcBlock, IfcRectangularPyramid, IfcRightCircularCone, IfcRightCircularCylinder, IfcSphere))
 SUBTYPE OF (IfcGeometricRepresentationItem);
  Position : IfcAxis2Placement3D;
 DERIVE
  Dim : IfcDimensionCount := 3;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcBooleanOperand IfcCsgSelect

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