to_string() option, no shared_ptr in OpaqueCoord, add ConvResShape::vertices(), newell instead of simple cross product, create_epeck(double/str)

src/ifcgeom/ConversionResult.cpp

@@ -1,6 +1,8 @@
 #include "ConversionResult.h"
 #include "IfcGeomRepresentation.h"
 
+#include <iomanip>
+
 IfcGeom::Representation::Triangulation * IfcGeom::ConversionResultShape::Triangulate(const ifcopenshell::geometry::Settings& settings) const
 {
 	auto t = IfcGeom::Representation::Triangulation::empty(settings);
@@ -18,3 +20,9 @@ void IfcGeom::ConversionResult::append(ifcopenshell::geometry::taxonomy::matrix4
 void IfcGeom::ConversionResult::prepend(ifcopenshell::geometry::taxonomy::matrix4::ptr trsf) {
 	placement_ = make<matrix4>(trsf->ccomponents() * placement_->ccomponents());
 }
+
+std::string IfcGeom::NumberNativeDouble::to_string() const {
+	std::stringstream ss;
+	ss << std::setprecision(std::numeric_limits<double>::digits10 + 1) << value_;
+	return ss.str();
+}

src/ifcgeom/ConversionResult.h

@@ -71,6 +71,8 @@ namespace IfcGeom {
 	class IFC_GEOM_API OpaqueNumber {
 	public:
 		virtual double to_double() const = 0;
+		virtual std::string to_string() const = 0;
+
 		virtual ~OpaqueNumber() {}
 
 		virtual OpaqueNumber* operator+(OpaqueNumber* other) const = 0;
@@ -80,6 +82,7 @@ namespace IfcGeom {
 		virtual bool operator==(OpaqueNumber* other) const = 0;
 		virtual bool operator<(OpaqueNumber* other) const = 0;
 		virtual OpaqueNumber* operator-() const = 0;
+		virtual OpaqueNumber* clone() const = 0;
 	};
 
 	// @todo this can simply be a template class, to remove the need for the NumberEpeck in CGAL kernel.
@@ -119,10 +122,11 @@ namespace IfcGeom {
 			return value_;
 		}
 
+		virtual std::string to_string() const;
+
 		virtual OpaqueNumber* operator+(OpaqueNumber* other) const {
 			return binary_op<add_<double>>(other);
 		}
-
 		virtual OpaqueNumber* operator-(OpaqueNumber* other) const {
 			return binary_op<subtract_<double>>(other);
 		}
@@ -141,11 +145,14 @@ namespace IfcGeom {
 		virtual OpaqueNumber* operator-() const {
 			return unary_op<negate_<double>>();
 		}
+		virtual OpaqueNumber* clone() const {
+			return new NumberNativeDouble(value_);
+		}
 	};
 
 	template <size_t N>
 	struct IFC_GEOM_API OpaqueCoordinate {
-		std::array<std::shared_ptr<OpaqueNumber>, N> values;
+		std::array<OpaqueNumber*, N> values;
 
 		template <typename... Args>
 		OpaqueCoordinate(Args... args) {
@@ -159,21 +166,21 @@ namespace IfcGeom {
 			}
 		}
 
-		std::shared_ptr<OpaqueNumber> get(size_t i) {
+		OpaqueNumber* get(size_t i) {
 			if (i >= N) {
 				return nullptr;
 			}
 			return values[i];
 		}
 
-		void set(size_t i, std::shared_ptr<OpaqueNumber> n) {
+		void set(size_t i, OpaqueNumber* n) {
 			if (i < N) {
-				values[i] = n;
+				values[i] = n->clone();
 			}
 		}
 	private:
 		template <size_t Index, typename... Args>
-		void init_(std::shared_ptr<OpaqueNumber> value, Args... args) {
+		void init_(OpaqueNumber* value, Args... args) {
 			values[Index] = value;
 			if constexpr (Index + 1 < N) {
 				init_<Index + 1>(args...);
@@ -200,9 +207,9 @@ namespace IfcGeom {
 		virtual std::pair<OpaqueCoordinate<3>, OpaqueCoordinate<3>> bounding_box() const = 0;
 		virtual void set_box(void* b) = 0;
 		
-		virtual std::shared_ptr<OpaqueNumber> length() = 0;
-		virtual std::shared_ptr<OpaqueNumber> area() = 0;
-		virtual std::shared_ptr<OpaqueNumber> volume() = 0;
+		virtual OpaqueNumber* length() = 0;
+		virtual OpaqueNumber* area() = 0;
+		virtual OpaqueNumber* volume() = 0;
 
 		virtual OpaqueCoordinate<3> position() = 0;
 		virtual OpaqueCoordinate<3> axis() = 0;
@@ -212,6 +219,8 @@ namespace IfcGeom {
 		virtual ConversionResultShape* halfspaces() = 0;
 		virtual ConversionResultShape* box() = 0;
 		virtual ConversionResultShape* solid() = 0;
+
+		virtual std::vector<ConversionResultShape*> vertices() = 0;
 		virtual std::vector<ConversionResultShape*> edges() = 0;
 		virtual std::vector<ConversionResultShape*> facets() = 0;
 

src/ifcgeom/kernels/cgal/CgalConversionResult.cpp

@@ -21,8 +21,12 @@ using ifcopenshell::geometry::NumberEpeck;
 
 ifcopenshell::geometry::CgalShape::CgalShape(const cgal_shape_t & shape) {
 	shape_ = shape;
-	CGAL::Polygon_mesh_processing::triangulate_faces(*shape_);
-	CGAL::Polygon_mesh_processing::remove_degenerate_faces(*shape_);
+	if (shape.size_of_facets() != 1) {
+		// this is for handling the specical case of storing a single point in a polyhedron,
+		// @todo come up with a proper variant for storing lower dimensional entities
+		CGAL::Polygon_mesh_processing::triangulate_faces(*shape_);
+		CGAL::Polygon_mesh_processing::remove_degenerate_faces(*shape_);
+	}
 }
 
 #ifndef IFOPSH_SIMPLE_KERNEL
@@ -63,7 +67,7 @@ void ifcopenshell::geometry::CgalShape::Triangulate(ifcopenshell::geometry::Sett
 			m(2, 0), m(2, 1), m(2, 2), m(2, 3));
 
 		// Apply transformation
-		for (auto &vertex : vertices(s)) {
+		for (auto &vertex : s.vertex_handles()) {
 			vertex->point() = vertex->point().transform(trsf);
 		}
 	}
@@ -185,7 +189,7 @@ void ifcopenshell::geometry::CgalShape::Serialize(const ifcopenshell::geometry::
 			m(2, 0), m(2, 1), m(2, 2), m(2, 3));
 
 		// Apply transformation
-		for (auto &vertex : vertices(s)) {
+		for (auto &vertex : s.vertex_handles()) {
 			vertex->point() = vertex->point().transform(trsf);
 		}
 	}
@@ -255,7 +259,7 @@ int ifcopenshell::geometry::CgalShape::num_faces() const
 	}
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShape::CgalShape::length()
+OpaqueNumber* ifcopenshell::geometry::CgalShape::CgalShape::length()
 {
 	to_poly();
 	Kernel_::FT len = 0;
@@ -265,19 +269,19 @@ std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShape::CgalShape::leng
 			it->next()->vertex()->point()
 		).squared_length());
 	}
-	return std::make_shared<NumberType>(len);
+	return new NumberType(len);
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShape::area()
+OpaqueNumber* ifcopenshell::geometry::CgalShape::area()
 {
 	to_poly();
-	return std::make_shared<NumberType>(CGAL::Polygon_mesh_processing::area(*shape_));
+	return new NumberType(CGAL::Polygon_mesh_processing::area(*shape_));
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShape::volume()
+OpaqueNumber* ifcopenshell::geometry::CgalShape::volume()
 {
 	to_poly();
-	return std::make_shared<NumberType>(CGAL::Polygon_mesh_processing::volume(*shape_));
+	return new NumberType(CGAL::Polygon_mesh_processing::volume(*shape_));
 }
 
 OpaqueCoordinate<3> ifcopenshell::geometry::CgalShape::position()
@@ -297,9 +301,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::CgalShape::position()
 			p[i] /= N;
 		}
 		return OpaqueCoordinate<3>(
-			std::make_shared<NumberType>(p[0]),
-			std::make_shared<NumberType>(p[1]),
-			std::make_shared<NumberType>(p[2])
+			new NumberType(p[0]),
+			new NumberType(p[1]),
+			new NumberType(p[2])
 		);
 	} else {
 		throw std::runtime_error("Invalid shape type");
@@ -307,15 +311,25 @@ OpaqueCoordinate<3> ifcopenshell::geometry::CgalShape::position()
 }
 
 namespace {
+	template <typename Facet>
+	CGAL::Direction_3<Kernel_> newell(Facet& face) {
+		typename Kernel_::FT a(0), b(0), c(0);
+		CGAL::Polyhedron_3<Kernel_>::Halfedge_around_facet_const_circulator current_halfedge = face.facet_begin();
+		do {
+			auto& curr = current_halfedge->vertex()->point();
+			auto& next = current_halfedge->next()->vertex()->point();
+			a += (curr.y() - next.y()) * (curr.z() + next.z());
+			b += (curr.z() - next.z()) * (curr.x() + next.x());
+			c += (curr.x() - next.x()) * (curr.y() + next.y());
+		} while (++current_halfedge != face.facet_begin());
+		return CGAL::Direction_3<Kernel_>(a, b, c);
+	}
+
 	struct Plane_equation {
-		template <class Facet>
-		typename Facet::Plane_3 operator()(Facet& f) {
-			// @todo from the docs, but better use Newell's method
-			typename Facet::Halfedge_handle h = f.halfedge();
-			typedef typename Facet::Plane_3  Plane;
-			return Plane(h->vertex()->point(),
-				h->next()->vertex()->point(),
-				h->next()->next()->vertex()->point());
+		template <typename Facet>
+		typename Facet::Plane_3 operator()(Facet& face) {
+			typename Facet::Halfedge_handle h = face.halfedge();
+			return typename Facet::Plane_3(h->vertex()->point(), newell(face));
 		}
 	};
 }
@@ -331,9 +345,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::CgalShape::axis()
 		auto maxval = ((-*minel) > *maxel) ? (-*minel) : *maxel;
 
 		return OpaqueCoordinate<3>(
-			std::make_shared<NumberType>(pl.a() / maxval),
-			std::make_shared<NumberType>(pl.b() / maxval),
-			std::make_shared<NumberType>(pl.c() / maxval)
+			new NumberType(pl.a() / maxval),
+			new NumberType(pl.b() / maxval),
+			new NumberType(pl.c() / maxval)
 		);
 	} else {
 		throw std::runtime_error("Invalid shape type");
@@ -390,9 +404,52 @@ ConversionResultShape * ifcopenshell::geometry::CgalShape::box()
 	throw std::runtime_error("Not implemented");
 }
 
+std::vector<ConversionResultShape*> ifcopenshell::geometry::CgalShape::vertices()
+{
+	// @todo this is ridiculous
+	to_poly();
+	std::vector<ConversionResultShape*> result;
+	for (auto& p : shape_->points()) {
+		std::vector<cgal_point_t> ps = {
+			p, p, p
+		};
+
+		std::vector<std::vector<size_t>> ids(1);
+		ids.front().push_back(0);
+		ids.front().push_back(1);
+		ids.front().push_back(2);
+
+		cgal_shape_t poly;
+		CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(ps, ids, poly);
+
+		result.push_back(new CgalShape(poly));
+	}
+	return result;
+}
+
 std::vector<ConversionResultShape*> ifcopenshell::geometry::CgalShape::edges()
 {
-	throw std::runtime_error("Not implemented");
+	// @todo this is ridiculous
+	to_poly();
+	std::vector<ConversionResultShape*> result;
+	for (auto& ed : shape_->edges()) {
+		std::vector<cgal_point_t> ps = {
+			ed.vertex()->point(),
+			ed.vertex()->point(),
+			ed.next()->vertex()->point()
+		};
+
+		std::vector<std::vector<size_t>> ids(1);
+		ids.front().push_back(0);
+		ids.front().push_back(1);
+		ids.front().push_back(2);
+
+		cgal_shape_t poly;
+		CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(ps, ids, poly);
+
+		result.push_back(new CgalShape(poly));
+	}
+	return result;
 }
 
 std::vector<ConversionResultShape*> ifcopenshell::geometry::CgalShape::facets()
@@ -463,7 +520,7 @@ ConversionResultShape* ifcopenshell::geometry::CgalShape::moved(ifcopenshell::ge
 			m(2, 0), m(2, 1), m(2, 2), m(2, 3));
 
 		// Apply transformation
-		for (auto &vertex : vertices(s)) {
+		for (auto &vertex : s.vertex_handles()) {
 			vertex->point() = vertex->point().transform(trsf);
 		}
 	}
@@ -515,17 +572,17 @@ int ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::num_faces() const
 	throw std::runtime_error("Not implemented");
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::CgalShapeHalfSpaceDecomposition::length()
+OpaqueNumber* ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::CgalShapeHalfSpaceDecomposition::length()
 {
 	throw std::runtime_error("Not implemented");
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::area()
+OpaqueNumber* ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::area()
 {
 	throw std::runtime_error("Not implemented");
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::volume()
+OpaqueNumber* ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::volume()
 {
 	throw std::runtime_error("Not implemented");
 }
@@ -535,9 +592,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::pos
 	if (planes_.size() == 1) {
 		auto xyz = CGAL::ORIGIN + planes_.front().d() * CGAL::Vector_3<Kernel_>(planes_.front().a(), planes_.front().b(), planes_.front().c());
 		return OpaqueCoordinate<3>(
-			std::make_shared<NumberType>(xyz.cartesian(0)),
-			std::make_shared<NumberType>(xyz.cartesian(1)),
-			std::make_shared<NumberType>(xyz.cartesian(2))
+			new NumberType(xyz.cartesian(0)),
+			new NumberType(xyz.cartesian(1)),
+			new NumberType(xyz.cartesian(2))
 		);
 	} else {
 		throw std::runtime_error("Invalid shape type");
@@ -552,9 +609,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::axi
 		auto maxel = std::max_element(abc.begin(), abc.end());
 		auto maxval = ((-*minel) > *maxel) ? (-*minel) : *maxel;
 		return OpaqueCoordinate<3>(
-			std::make_shared<NumberType>(planes_.front().a() / maxval),
-			std::make_shared<NumberType>(planes_.front().b() / maxval),
-			std::make_shared<NumberType>(planes_.front().c() / maxval)
+			new NumberType(planes_.front().a() / maxval),
+			new NumberType(planes_.front().b() / maxval),
+			new NumberType(planes_.front().c() / maxval)
 		);
 	} else {
 		throw std::runtime_error("Invalid shape type");
@@ -569,10 +626,10 @@ OpaqueCoordinate<4> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::pla
 		auto maxel = std::max_element(abc.begin(), abc.end());
 		auto maxval = ((-*minel) > *maxel) ? (-*minel) : *maxel;
 		return OpaqueCoordinate<4>(
-			std::make_shared<NumberType>(planes_.front().a() / maxval),
-			std::make_shared<NumberType>(planes_.front().b() / maxval),
-			std::make_shared<NumberType>(planes_.front().c() / maxval),
-			std::make_shared<NumberType>(planes_.front().d() / maxval)
+			new NumberType(planes_.front().a() / maxval),
+			new NumberType(planes_.front().b() / maxval),
+			new NumberType(planes_.front().c() / maxval),
+			new NumberType(planes_.front().d() / maxval)
 		);
 	} else {
 		throw std::runtime_error("Invalid shape type");
@@ -599,6 +656,11 @@ ConversionResultShape * ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition:
 	throw std::runtime_error("Not implemented");
 }
 
+std::vector<ConversionResultShape*> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::vertices()
+{
+	throw std::runtime_error("Not implemented");
+}
+
 std::vector<ConversionResultShape*> ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::edges()
 {
 	throw std::runtime_error("Not implemented");
@@ -646,16 +708,16 @@ void ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::map(OpaqueCoordina
 	plane_map<Kernel_> mp;
 	mp.insert({
 		CGAL::Plane_3<Kernel_>(
-			std::static_pointer_cast<NumberEpeck>(from.values[0])->value(),
-			std::static_pointer_cast<NumberEpeck>(from.values[1])->value(),
-			std::static_pointer_cast<NumberEpeck>(from.values[2])->value(),
-			std::static_pointer_cast<NumberEpeck>(from.values[3])->value()
+			static_cast<NumberEpeck*>(from.values[0])->value(),
+			static_cast<NumberEpeck*>(from.values[1])->value(),
+			static_cast<NumberEpeck*>(from.values[2])->value(),
+			static_cast<NumberEpeck*>(from.values[3])->value()
 		),
 		CGAL::Plane_3<Kernel_>(
-			std::static_pointer_cast<NumberEpeck>(to.values[0])->value(),
-			std::static_pointer_cast<NumberEpeck>(to.values[1])->value(),
-			std::static_pointer_cast<NumberEpeck>(to.values[2])->value(),
-			std::static_pointer_cast<NumberEpeck>(to.values[3])->value()
+			static_cast<NumberEpeck*>(to.values[0])->value(),
+			static_cast<NumberEpeck*>(to.values[1])->value(),
+			static_cast<NumberEpeck*>(to.values[2])->value(),
+			static_cast<NumberEpeck*>(to.values[3])->value()
 		)
 	});
 	auto nw = shape_->map(mp);
@@ -674,16 +736,16 @@ void ifcopenshell::geometry::CgalShapeHalfSpaceDecomposition::map(const std::vec
 		auto& to = *jt;
 		mp.insert({
 			CGAL::Plane_3<Kernel_>(
-				std::static_pointer_cast<NumberEpeck>(from.values[0])->value(),
-				std::static_pointer_cast<NumberEpeck>(from.values[1])->value(),
-				std::static_pointer_cast<NumberEpeck>(from.values[2])->value(),
-				std::static_pointer_cast<NumberEpeck>(from.values[3])->value()
+				static_cast<NumberEpeck*>(from.values[0])->value(),
+				static_cast<NumberEpeck*>(from.values[1])->value(),
+				static_cast<NumberEpeck*>(from.values[2])->value(),
+				static_cast<NumberEpeck*>(from.values[3])->value()
 			),
 			CGAL::Plane_3<Kernel_>(
-				std::static_pointer_cast<NumberEpeck>(to.values[0])->value(),
-				std::static_pointer_cast<NumberEpeck>(to.values[1])->value(),
-				std::static_pointer_cast<NumberEpeck>(to.values[2])->value(),
-				std::static_pointer_cast<NumberEpeck>(to.values[3])->value()
+				static_cast<NumberEpeck*>(to.values[0])->value(),
+				static_cast<NumberEpeck*>(to.values[1])->value(),
+				static_cast<NumberEpeck*>(to.values[2])->value(),
+				static_cast<NumberEpeck*>(to.values[3])->value()
 			)
 			});
 	}

src/ifcgeom/kernels/cgal/CgalConversionResult.h

@@ -132,10 +132,18 @@ namespace ifcopenshell { namespace geometry {
 		NumberEpeck(const CGAL::Epeck::FT& v)
 			: value_(v) {}
 
+		virtual ~NumberEpeck() { }
+
 		virtual double to_double() const {
 			return CGAL::to_double(value_);
 		}
 
+		virtual std::string to_string() const {
+			std::stringstream ss;
+			ss << value_.exact();
+			return ss.str();
+		}
+
 		const CGAL::Epeck::FT& value() const {
 			return value_;
 		}
@@ -161,6 +169,9 @@ namespace ifcopenshell { namespace geometry {
 		virtual OpaqueNumber* operator-() const {
 			return unary_op<negate_<CGAL::Epeck::FT>>();
 		}
+		virtual OpaqueNumber* clone() const {
+			return new NumberEpeck(value_);
+		}
 	};
 #endif
 
@@ -217,9 +228,9 @@ namespace ifcopenshell { namespace geometry {
 		// @todo this must be something with a virtual dtor so that we can delete it.
 		virtual std::pair<OpaqueCoordinate<3>, OpaqueCoordinate<3>> bounding_box() const;
 
-		virtual std::shared_ptr<OpaqueNumber> length();
-		virtual std::shared_ptr<OpaqueNumber> area();
-		virtual std::shared_ptr<OpaqueNumber> volume();
+		virtual OpaqueNumber* length();
+		virtual OpaqueNumber* area();
+		virtual OpaqueNumber* volume();
 
 		virtual OpaqueCoordinate<3> position();
 		virtual OpaqueCoordinate<3> axis();
@@ -229,6 +240,8 @@ namespace ifcopenshell { namespace geometry {
 		virtual ConversionResultShape* halfspaces();
 		virtual ConversionResultShape* solid();
 		virtual ConversionResultShape* box();
+
+		virtual std::vector<ConversionResultShape*> vertices();
 		virtual std::vector<ConversionResultShape*> edges();
 		virtual std::vector<ConversionResultShape*> facets();
 
@@ -274,9 +287,9 @@ namespace ifcopenshell { namespace geometry {
 		virtual std::pair<OpaqueCoordinate<3>, OpaqueCoordinate<3>> bounding_box() const;
 		virtual void set_box(void* b);
 
-		virtual std::shared_ptr<OpaqueNumber> length();
-		virtual std::shared_ptr<OpaqueNumber> area();
-		virtual std::shared_ptr<OpaqueNumber> volume();
+		virtual OpaqueNumber* length();
+		virtual OpaqueNumber* area();
+		virtual OpaqueNumber* volume();
 
 		virtual OpaqueCoordinate<3> position();
 		virtual OpaqueCoordinate<3> axis();
@@ -286,6 +299,8 @@ namespace ifcopenshell { namespace geometry {
 		virtual ConversionResultShape* halfspaces();
 		virtual ConversionResultShape* solid();
 		virtual ConversionResultShape* box();
+
+		virtual std::vector<ConversionResultShape*> vertices();
 		virtual std::vector<ConversionResultShape*> edges();
 		virtual std::vector<ConversionResultShape*> facets();
 

src/ifcgeom/kernels/opencascade/OpenCascadeConversionResult.cpp

@@ -257,28 +257,28 @@ int ifcopenshell::geometry::OpenCascadeShape::num_faces() const
 	return IfcGeom::util::count(shape_, TopAbs_FACE);
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::OpenCascadeShape::OpenCascadeShape::length()
+OpaqueNumber* ifcopenshell::geometry::OpenCascadeShape::OpenCascadeShape::length()
 {
 	GProp_GProps prop;
 	BRepGProp::LinearProperties(shape_, prop);
 	double l = prop.Mass();
-	return std::make_shared<NumberNativeDouble>(l);
+	return new NumberNativeDouble(l);
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::OpenCascadeShape::area()
+OpaqueNumber* ifcopenshell::geometry::OpenCascadeShape::area()
 {
 	GProp_GProps prop;
 	BRepGProp::SurfaceProperties(shape_, prop);
 	double l = prop.Mass();
-	return std::make_shared<NumberNativeDouble>(l);
+	return new NumberNativeDouble(l);
 }
 
-std::shared_ptr<OpaqueNumber> ifcopenshell::geometry::OpenCascadeShape::volume()
+OpaqueNumber* ifcopenshell::geometry::OpenCascadeShape::volume()
 {
 	GProp_GProps prop;
 	BRepGProp::VolumeProperties(shape_, prop);
 	double l = prop.Mass();
-	return std::make_shared<NumberNativeDouble>(l);
+	return new NumberNativeDouble(l);
 }
 
 #include <Geom_Plane.hxx>
@@ -291,9 +291,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::OpenCascadeShape::position()
 		if (plane) {
 			auto loc = plane->Location();
 			return OpaqueCoordinate<3>(
-				std::make_shared<NumberNativeDouble>(loc.X()),
-				std::make_shared<NumberNativeDouble>(loc.Y()),
-				std::make_shared<NumberNativeDouble>(loc.Z())
+				new NumberNativeDouble(loc.X()),
+				new NumberNativeDouble(loc.Y()),
+				new NumberNativeDouble(loc.Z())
 			);
 		}
 	}
@@ -308,9 +308,9 @@ OpaqueCoordinate<3> ifcopenshell::geometry::OpenCascadeShape::axis()
 		if (plane) {
 			auto dir = plane->Axis().Direction();
 			return OpaqueCoordinate<3>(
-				std::make_shared<NumberNativeDouble>(dir.X()),
-				std::make_shared<NumberNativeDouble>(dir.Y()),
-				std::make_shared<NumberNativeDouble>(dir.Z())
+				new NumberNativeDouble(dir.X()),
+				new NumberNativeDouble(dir.Y()),
+				new NumberNativeDouble(dir.Z())
 			);
 		}
 	}
@@ -326,10 +326,10 @@ OpaqueCoordinate<4> ifcopenshell::geometry::OpenCascadeShape::plane_equation()
 			double a, b, c, d;
 			plane->Pln().Coefficients(a, b, c, d);
 			return OpaqueCoordinate<4>(
-				std::make_shared<NumberNativeDouble>(a),
-				std::make_shared<NumberNativeDouble>(b),
-				std::make_shared<NumberNativeDouble>(c),
-				std::make_shared<NumberNativeDouble>(d)
+				new NumberNativeDouble(a),
+				new NumberNativeDouble(b),
+				new NumberNativeDouble(c),
+				new NumberNativeDouble(d)
 			);
 		}
 	}
@@ -356,6 +356,17 @@ ConversionResultShape * ifcopenshell::geometry::OpenCascadeShape::box()
 	throw std::runtime_error("Not implemented");
 }
 
+std::vector<ConversionResultShape*> ifcopenshell::geometry::OpenCascadeShape::vertices()
+{
+	TopTools_IndexedMapOfShape map;
+	TopExp::MapShapes(shape_, TopAbs_VERTEX, map);
+	std::vector<ConversionResultShape*> vec;
+	for (int i = 1; i <= map.Extent(); ++i) {
+		vec.push_back(new OpenCascadeShape(map.FindKey(i)));
+	}
+	return vec;
+}
+
 std::vector<ConversionResultShape*> ifcopenshell::geometry::OpenCascadeShape::edges()
 {
 	TopTools_IndexedMapOfShape map;

src/ifcgeom/kernels/opencascade/OpenCascadeConversionResult.h

@@ -75,9 +75,9 @@ namespace ifcopenshell {
 			// @todo this must be something with a virtual dtor so that we can delete it.
 			virtual std::pair<OpaqueCoordinate<3>, OpaqueCoordinate<3>> bounding_box() const;
 
-			virtual std::shared_ptr<OpaqueNumber> length();
-			virtual std::shared_ptr<OpaqueNumber> area();
-			virtual std::shared_ptr<OpaqueNumber> volume();
+			virtual OpaqueNumber* length();
+			virtual OpaqueNumber* area();
+			virtual OpaqueNumber* volume();
 
 			virtual OpaqueCoordinate<3> position();
 			virtual OpaqueCoordinate<3> axis();
@@ -87,6 +87,8 @@ namespace ifcopenshell {
 			virtual ConversionResultShape* halfspaces();
 			virtual ConversionResultShape* solid();
 			virtual ConversionResultShape* box();
+
+			virtual std::vector<ConversionResultShape*> vertices();
 			virtual std::vector<ConversionResultShape*> edges();
 			virtual std::vector<ConversionResultShape*> facets();
 

src/ifcwrap/IfcGeomWrapper.i

@@ -58,6 +58,8 @@
 	}
 }
 
+%newobject IfcGeom::Representation::BRep::item;
+
 %newobject IfcGeom::ConversionResultShape::halfspaces;
 %newobject IfcGeom::ConversionResultShape::box;
 %newobject IfcGeom::ConversionResultShape::solid;
@@ -65,8 +67,18 @@
 %newobject IfcGeom::ConversionResultShape::subtract;
 %newobject IfcGeom::ConversionResultShape::intersect;
 %newobject IfcGeom::ConversionResultShape::moved;
+
+%newobject IfcGeom::ConversionResultShape::area;
+%newobject IfcGeom::ConversionResultShape::volume;
+%newobject IfcGeom::ConversionResultShape::length;
+
 %newobject nary_union;
 
+%newobject IfcGeom::OpaqueNumber::operator+;
+%newobject IfcGeom::OpaqueNumber::operator-;
+%newobject IfcGeom::OpaqueNumber::operator*;
+%newobject IfcGeom::OpaqueNumber::operator/;
+
 %include "../ifcgeom/ifc_geom_api.h"
 %include "../ifcgeom/Converter.h"
 %include "../ifcgeom/ConversionResult.h"
@@ -640,15 +652,23 @@ struct ShapeRTTI : public boost::static_visitor<PyObject*>
 %template(OpaqueCoordinate_3) IfcGeom::OpaqueCoordinate<3>;
 %template(OpaqueCoordinate_4) IfcGeom::OpaqueCoordinate<4>;
 
+%newobject create_epeck;
+
 %inline %{
-	std::shared_ptr<IfcGeom::OpaqueNumber> create_epeck(int i) {
-		return std::make_shared<ifcopenshell::geometry::NumberEpeck>(i);
+	IfcGeom::OpaqueNumber* create_epeck(int i) {
+		return new ifcopenshell::geometry::NumberEpeck(i);
+	}
+	IfcGeom::OpaqueNumber* create_epeck(double d) {
+		return new ifcopenshell::geometry::NumberEpeck(d);
+	}
+	IfcGeom::OpaqueNumber* create_epeck(const std::string& s) {
+		return new ifcopenshell::geometry::NumberEpeck(typename CGAL::Epeck::FT::ET(s));
 	}
 %}
 
 %inline %{
 	IfcGeom::ConversionResultShape* nary_union(PyObject* sequence) {
-		CGAL::Nef_nary_union_3< CGAL::Nef_polyhedron_3<Kernel_> > accum;
+		CGAL::Nef_nary_union_3< CGAL::Nef_polyhedron_3<CGAL::Epeck> > accum;
 		for(Py_ssize_t i = 0; i < PySequence_Size(sequence); ++i) {
 			PyObject* element = PySequence_GetItem(sequence, i);
 			void* argp1 = nullptr;

src/ifcwrap/IfcPython.i

@@ -52,9 +52,7 @@
 %include "std_vector.i"
 %include "std_string.i"
 %include "exception.i"
-%include "std_shared_ptr.i"
 
-%shared_ptr(IfcGeom::OpaqueNumber);
 %ignore IfcGeom::NumberNativeDouble;
 %ignore ifcopenshell::geometry::Converter;