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.
The second operand of the Boolean clipping operation shall be an IfcHalfSpaceSolid.
The Boolean operator for clipping is always "Difference".
|LayerAssignment||SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems||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.
|StyledByItem||SET [0:1] OF IfcStyledItem FOR Item||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.
|1||Operator||IfcBooleanOperator||The Boolean operator used in the operation to create the result.|
|2||FirstOperand||IfcBooleanOperand||The first operand to be operated upon by the Boolean operation.|
|3||SecondOperand||IfcBooleanOperand||The second operand specified for the operation.|
|Dim||INVALID||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.|
ENTITY IfcBooleanClippingResult SUBTYPE OF (IfcBooleanResult); WHERE FirstOperandType : ('IFC4X3_DEV_a1492713.IFCSWEPTAREASOLID' IN TYPEOF(FirstOperand)) OR ('IFC4X3_DEV_a1492713.IFCSWEPTDISCSOLID' IN TYPEOF(FirstOperand)) OR ('IFC4X3_DEV_a1492713.IFCBOOLEANCLIPPINGRESULT' IN TYPEOF(FirstOperand)); SecondOperandType : ('IFC4X3_DEV_a1492713.IFCHALFSPACESOLID' IN TYPEOF(SecondOperand)); OperatorType : Operator = DIFFERENCE; END_ENTITY;