diff -r a5111f4e6412 -r 918b6c0f8b5b src/linetypes/quadrilateral.h
--- a/src/linetypes/quadrilateral.h	Fri Dec 13 15:55:56 2019 +0200
+++ b/src/linetypes/quadrilateral.h	Fri Dec 13 21:35:59 2019 +0200
@@ -11,15 +11,15 @@
 public:
 	Quadrilateral() = default;
 	Quadrilateral(
-	const Vertex &point_1,
-	const Vertex &point_2,
-	const Vertex &point_3,
-	const Vertex &point_4,
+	const Point3D &point_1,
+	const Point3D &point_2,
+	const Point3D &point_3,
+	const Point3D &point_4,
 	Color colorIndex = colors::main);
-	Quadrilateral(const QVector<Vertex>& vertices, const Color color);
+	Quadrilateral(const QVector<Point3D>& vertices, const Color color);
 	QVariant getProperty(Property id) const override;
 	SetPropertyResult setProperty(Property id, const QVariant& value) override;
 	QString textRepresentation() const override;
 private:
-	Vertex points[4] = {{}};
+	Point3D points[4] = {{}};
 };