IfcBooleanClippingResult

BACnet MVD

#### IfcBooleanClippingResult

Natural language names

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

##### 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 | B
--- | --- | --- | --- | --- | ---
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

X

IfcGeometricRepresentationItem
IfcBooleanResult
1 | Operator | IfcBooleanOperator |  | The Boolean operator used in the operation to create the result. | X | X
2 | FirstOperand | IfcBooleanOperand |  | The first operand to be operated upon by the Boolean operation. | X | X
3 | SecondOperand | IfcBooleanOperand |  | The second operand specified for the operation. | X | 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 | 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.IFCSWEPTDISCSOLID' IN TYPEOF(FirstOperand)) OR
('IFCGEOMETRICMODELRESOURCE.IfcBooleanClippingResult' IN TYPEOF(FirstOperand));
SecondOperandType : ('IFCGEOMETRICMODELRESOURCE.IfcHalfSpaceSolid' IN TYPEOF(SecondOperand));
OperatorType : Operator = DIFFERENCE;
END_ENTITY;

EXPRESS-G diagram

`

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