diff -r 767592024ec5 -r 4c41bfe2ec6e src/linetypes/quadrilateral.h
--- a/src/linetypes/quadrilateral.h	Sun Jan 26 01:06:27 2020 +0200
+++ b/src/linetypes/quadrilateral.h	Sun Jan 26 14:29:30 2020 +0200
@@ -11,17 +11,17 @@
 public:
 	Quadrilateral() = default;
 	Quadrilateral(
-	const Point3D &point_1,
-	const Point3D &point_2,
-	const Point3D &point_3,
-	const Point3D &point_4,
+	const glm::vec3 &point_1,
+	const glm::vec3 &point_2,
+	const glm::vec3 &point_3,
+	const glm::vec3 &point_4,
 	Color colorIndex = colors::main);
-	Quadrilateral(const QVector<Point3D>& vertices, const Color color);
+	Quadrilateral(const QVector<glm::vec3>& vertices, const Color color);
 	QVariant getProperty(Property id) const override;
 	SetPropertyResult setProperty(Property id, const QVariant& value) override;
 	QString textRepresentation() const override;
 	void getPolygons(std::vector<gl::Polygon>& polygons, GetPolygonsContext* context) const override;
 	void invert() override;
 private:
-	Point3D points[4] = {{}};
+	glm::vec3 points[4] = {{}};
 };