diff -r a5111f4e6412 -r 918b6c0f8b5b src/linetypes/quadrilateral.cpp
--- a/src/linetypes/quadrilateral.cpp	Fri Dec 13 15:55:56 2019 +0200
+++ b/src/linetypes/quadrilateral.cpp	Fri Dec 13 21:35:59 2019 +0200
@@ -1,17 +1,17 @@
 #include "quadrilateral.h"
 
 linetypes::Quadrilateral::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 color_index) :
 	ColoredObject{color_index},
 	points{point_1, point_2, point_3, point_4}
 {
 }
 
-linetypes::Quadrilateral::Quadrilateral(const QVector<Vertex>& vertices, const Color color) :
+linetypes::Quadrilateral::Quadrilateral(const QVector<Point3D>& vertices, const Color color) :
 	ColoredObject{color},
 	points{vertices[0], vertices[1], vertices[2], vertices[3]}
 {
@@ -42,16 +42,16 @@
 	switch (id)
 	{
 	case Property::Point1:
-		points[0] = value.value<Vertex>();
+		points[0] = value.value<Point3D>();
 		return SetPropertyResult::Success;
 	case Property::Point2:
-		points[1] = value.value<Vertex>();
+		points[1] = value.value<Point3D>();
 		return SetPropertyResult::Success;
 	case Property::Point3:
-		points[2] = value.value<Vertex>();
+		points[2] = value.value<Point3D>();
 		return SetPropertyResult::Success;
 	case Property::Point4:
-		points[3] = value.value<Vertex>();
+		points[3] = value.value<Point3D>();
 		return SetPropertyResult::Success;
 	default:
 		return ColoredObject::setProperty(id, value);