IfcBooleanClippingResult

Semantic definitions at the entity

Entity definition

A clipping result is defined as a special subtype of the general IfcBooleanResult. It constrains the operands and the operator of the Boolean result.

A clipping result is the Boolean difference between a swept solid and a half space solid, or between the result of the Boolean difference and a half space solid. Hence more than one difference operation can be applied to achieve the final Boolean result.

HISTORY New entity in IFC2x.

Formal Propositions

Rule	Description
FirstOperandType	The first operand of the Boolean clipping operation shall be either an IfcSweptAreaSolid or (in case of more than one clipping) an IfcBooleanResult.
SecondOperandType	The second operand of the Boolean clipping operation shall be an IfcHalfSpaceSolid.
OperatorType	The Boolean operator for clipping is always "Difference".

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
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. 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
	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. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcBooleanResult
1	Operator	IfcBooleanOperator		The Boolean operator used in the operation to create the result.	X
2	FirstOperand	IfcBooleanOperand		The first operand to be operated upon by the Boolean operation.	X
3	SecondOperand	IfcBooleanOperand		The second operand specified for the operation.	X
	Dim :=FirstOperand.Dim	IfcDimensionCount		The space dimensionality of this entity. It is identical with the space dimensionality of the first operand. A where rule ensures that both operands have the same space dimensionality.	X
IfcBooleanClippingResult

Formal representations

XML Specification

 <xs:element name="IfcBooleanClippingResult" type="ifc:IfcBooleanClippingResult" substitutionGroup="ifc:IfcBooleanResult" nillable="true"/>

 <xs:complexType name="IfcBooleanClippingResult">

  <xs:complexContent>

   <xs:extension base="ifc:IfcBooleanResult"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcBooleanClippingResult

 SUBTYPE OF (IfcBooleanResult);

 WHERE

  FirstOperandType : ('IFCGEOMETRICMODELRESOURCE.IfcSweptAreaSolid' IN TYPEOF(FirstOperand)) OR 

('IFCGEOMETRICMODELRESOURCE.IfcSweptDiskSolid' IN TYPEOF(FirstOperand)) OR 

('IFCGEOMETRICMODELRESOURCE.IfcBooleanClippingResult' IN TYPEOF(FirstOperand));
  SecondOperandType : ('IFCGEOMETRICMODELRESOURCE.IfcHalfSpaceSolid' IN TYPEOF(SecondOperand));
  OperatorType : Operator = DIFFERENCE;
END_ENTITY;

 EXPRESS-G diagram

	Boolesches Ergebnis - Abkappen
	Boolean Clipping Result
	Résultat d'opération booléen