Proceed with merge

src/ifcgeom/kernels/opencascade/solid.cpp

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+/********************************************************************************
+ *                                                                              *
+ * This file is part of IfcOpenShell.                                           *
+ *                                                                              *
+ * IfcOpenShell is free software: you can redistribute it and/or modify         *
+ * it under the terms of the Lesser GNU General Public License as published by  *
+ * the Free Software Foundation, either version 3.0 of the License, or          *
+ * (at your option) any later version.                                          *
+ *                                                                              *
+ * IfcOpenShell is distributed in the hope that it will be useful,              *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of               *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                 *
+ * Lesser GNU General Public License for more details.                          *
+ *                                                                              *
+ * You should have received a copy of the Lesser GNU General Public License     *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
+ *                                                                              *
+ ********************************************************************************/
+
+#include "OpenCascadeKernel.h"
+
+#include <BRepPrimAPI_MakeHalfSpace.hxx>
+#include <BRepBuilderAPI_MakeFace.hxx>
+#include <BRepPrimAPI_MakePrism.hxx>
+#include <BRepAlgoAPI_Common.hxx>
+
+using namespace ifcopenshell::geometry;
+using namespace ifcopenshell::geometry::kernels;
+using namespace IfcGeom;
+using namespace IfcGeom::util;
+
+bool OpenCascadeKernel::convert(const taxonomy::solid* solid, TopoDS_Shape& result) {
+	BRep_Builder BB;
+	TopoDS_Solid S;
+	for (auto& s : solid->children) {
+		if (s->kind() == taxonomy::FACE) {
+			// halfspace
+			if (solid->children.size() != 1) {
+				throw std::runtime_error("Unexpected number of children on solid");
+			}
+
+			auto face = (taxonomy::face*) s;
+
+			const auto& m = ((taxonomy::geom_item*)face->basis)->matrix.ccomponents();
+			gp_Pln pln(convert_xyz2<gp_Pnt>(m.col(3)), convert_xyz2<gp_Dir>(m.col(2)));
+			const gp_Pnt pnt = pln.Location().Translated(face->orientation.get_value_or(false) ? pln.Axis().Direction() : -pln.Axis().Direction());
+			TopoDS_Shape halfspace = BRepPrimAPI_MakeHalfSpace(BRepBuilderAPI_MakeFace(pln), pnt).Solid();
+
+			if (!face->children.empty()) {
+				TopoDS_Wire wire;
+				gp_GTrsf gtrsf;
+
+				if (convert((taxonomy::loop*)face->children[0], wire) && wire.Closed() && convert(&face->matrix, gtrsf)) {
+					gp_Trsf trsf = gtrsf.Trsf();
+					TopoDS_Shape prism = BRepPrimAPI_MakePrism(BRepBuilderAPI_MakeFace(wire), gp_Vec(0, 0, 200));
+					gp_Trsf down; down.SetTranslation(gp_Vec(0, 0, -100.0));
+
+					// `trsf` and `down` both have a unit scale factor
+					prism.Move(trsf*down);
+
+					halfspace = BRepAlgoAPI_Common(halfspace, prism);
+				}
+			}
+
+			result = halfspace;
+			return true;
+		} else {
+			if (s->kind() != taxonomy::SHELL) {
+				throw std::runtime_error("Unexpected child in solid");
+			}
+			if (S.IsNull()) {
+				BB.MakeSolid(S);
+			}
+			TopoDS_Shell shl;
+			convert(((taxonomy::shell*)s), shl);
+			BB.Add(S, shl);
+		}
+	}
+	if (!S.IsNull()) {
+		result = S;
+	}
+}
+
+bool OpenCascadeKernel::convert_impl(const taxonomy::solid* solid , IfcGeom::ConversionResults& results) {
+	TopoDS_Shape shape;
+	if (!convert(solid, shape)) {
+		return false;
+	}
+	results.emplace_back(ConversionResult(
+		solid->instance->data().id(),
+		solid->matrix,
+		new OpenCascadeShape(shape),
+		solid->surface_style
+	));
+	return true;
+}