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IfcBooleanOperand

Definition from ISO/CD 10303-42:1992: This select type identifies all those types of entities which may participate in a Boolean operation to form a CSG solid.

Definition from IAI: CSG primitives are out of scope for the current IFC Release. Only faceted B-reps, swept area solids and half space solids are available as Boolean operands. Boolean results themselves can be used as operands thus enabling nested Boolean operations.

NOTE Corresponding STEP type: boolean_operand, please refer to ISO/IS 10303-42:1994, p.167 for the final definition of the formal standard. In IFC Release 1.5.1 & 2.0 only Boolean results (IfcBooleanResult), half space solids (IfcHalfSpaceSolid), faceted B-Rep, extruded solids and revolved solids (IfcSolidModel) are defined for being valid Boolean operands.

HISTORY: New Type in IFC Release 1.5.1

EXPRESS specification:

TYPE IfcBooleanOperand = SELECT
( IfcSolidModel,
IfcHalfSpaceSolid,
IfcBooleanResult,
IfcCsgPrimitive3D);
END_TYPE;