Option to disable boolean results (sets result to first operand)

src/ifcgeom/IfcGeom.h

@@ -229,6 +229,8 @@ private:
 	const IfcParse::declaration* placement_rel_to;
 
 	faceset_helper* faceset_helper_;
+	double disable_boolean_result;
+
 	gp_Vec offset = gp_Vec{0.0, 0.0, 0.0};
 	gp_Quaternion rotation = gp_Quaternion{};
 	gp_Trsf offset_and_rotation = gp_Trsf();
@@ -252,6 +254,8 @@ public:
 		, dimensionality(1.)
 		, placement_rel_to(nullptr)
 		, faceset_helper_(nullptr)
+		, layerset_first(-1.)
+		, disable_boolean_result(-1.)
 	{}
 
 	MAKE_TYPE_NAME(Kernel)(const MAKE_TYPE_NAME(Kernel)& other)
@@ -265,6 +269,9 @@ public:
 		, placement_rel_to(other.placement_rel_to)
 		// @nb faceset_helper_ always initialized to 0
 		, faceset_helper_(nullptr)
+		, layerset_first(other.layerset_first)
+		, disable_boolean_result(other.disable_boolean_result)
+
 		, offset(other.offset)
 		, rotation(other.rotation)
 		, offset_and_rotation(other.offset_and_rotation)
@@ -279,6 +286,9 @@ public:
 		modelling_precision = other.modelling_precision;
 		dimensionality = other.dimensionality;
 		placement_rel_to = other.placement_rel_to;
+		layerset_first = other.layerset_first;
+		disable_boolean_result = other.disable_boolean_result;
+
 		offset = other.offset;
 		rotation = other.rotation;
 		offset_and_rotation = other.offset_and_rotation;

src/ifcgeom/IfcGeomFunctions.cpp

@@ -1412,6 +1412,9 @@ void IfcGeom::Kernel::setValue(GeomValue var, double value) {
 	case GV_LAYERSET_FIRST:
 		layerset_first = value;
 		break;
+	case GV_DISABLE_BOOLEAN_RESULT:
+		disable_boolean_result = value;
+		break;
 	default:
 		throw std::runtime_error("Invalid setting");
 	}
@@ -1439,6 +1442,8 @@ double IfcGeom::Kernel::getValue(GeomValue var) const {
 		return max_faces_to_orient;
 	case GV_LAYERSET_FIRST:
 		return layerset_first;
+	case GV_DISABLE_BOOLEAN_RESULT:
+		return disable_boolean_result;
 	}
 	throw std::runtime_error("Invalid setting");
 }

src/ifcgeom/IfcGeomIteratorImplementation.h

@@ -1003,6 +1003,11 @@ namespace IfcGeom {
 				? +1.0
 				: -1.0
 			);
+			kernel.setValue(IfcGeom::Kernel::GV_DISABLE_BOOLEAN_RESULT,
+				settings.get(IteratorSettings::DISABLE_BOOLEAN_RESULT)
+				? +1.0
+				: -1.0
+			);
 
 			if (settings.get(IteratorSettings::BUILDING_LOCAL_PLACEMENT)) {
 				if (settings.get(IteratorSettings::SITE_LOCAL_PLACEMENT)) {

src/ifcgeom/IfcGeomIteratorSettings.h

@@ -92,8 +92,10 @@ namespace IfcGeom
 			LAYERSET_FIRST = 1 << 18,
 			/// Adds arrow heads to edge segments to signify edge direction
 			EDGE_ARROWS = 1 << 19,
+			/// Disables the evaluation of IfcBooleanResult and simply returns FirstOperand
+			DISABLE_BOOLEAN_RESULT = 1 << 20,
 			/// Number of different setting flags.
-			NUM_SETTINGS = 19
+			NUM_SETTINGS = 20
         };
         /// Used to store logical OR combination of setting flags.
         typedef unsigned SettingField;

src/ifcgeom/IfcGeomShapes.cpp

@@ -604,6 +604,11 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcBooleanResult* l, TopoDS_Shape
 		return false;
 	}
 
+	if (getValue(GV_DISABLE_BOOLEAN_RESULT) > 0.0) {
+		shape = s1;
+		return true;
+	}
+
 	const double first_operand_volume = shape_volume(s1);
 	if (first_operand_volume <= ALMOST_ZERO) {
 		Logger::Message(Logger::LOG_WARNING, "Empty solid for:", l->FirstOperand());