8.8.3.4 IfcBooleanClippingResult
8.8.3.4.1 Semantic 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.
New entity in IFC2x.8.8.3.4.2 Entity inheritance
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- IfcBooleanResult
- IfcAnnotationFillArea
- IfcBoundingBox
- IfcCartesianPointList
- IfcCartesianTransformationOperator
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.8.3.4.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcRepresentationItem (2) | |||
| 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. The inverse attribute LayerAssignments has been added. 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. The inverse attribute StyledByItem has been added. |
|
| Click to show 2 hidden inherited attributes Click to hide 2 inherited attributes | |||
| IfcBooleanResult (4) | |||
| 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 | IfcDimensionCount |
This attribute is formally derived. 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. |
8.8.3.4.4 Formal propositions
| Name | 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. |
|
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| OperatorType |
The Boolean operator for clipping is always "Difference". |
|
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| SecondOperandType |
The second operand of the Boolean clipping operation shall be an IfcHalfSpaceSolid. |
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8.8.3.4.5 Formal representation
ENTITY IfcBooleanClippingResult
SUBTYPE OF (IfcBooleanResult);
WHERE
FirstOperandType : ('IFC4X3_DEV_bc7847cd.IFCSWEPTAREASOLID' IN TYPEOF(FirstOperand)) OR
('IFC4X3_DEV_bc7847cd.IFCSWEPTDISCSOLID' IN TYPEOF(FirstOperand)) OR
('IFC4X3_DEV_bc7847cd.IFCBOOLEANCLIPPINGRESULT' IN TYPEOF(FirstOperand));
OperatorType : Operator = DIFFERENCE;
SecondOperandType : ('IFC4X3_DEV_bc7847cd.IFCHALFSPACESOLID' IN TYPEOF(SecondOperand));
END_ENTITY;