diff -r 764381756899 -r 62373840e33a src/linetypes/quadrilateral.h
--- a/src/linetypes/quadrilateral.h	Wed Mar 11 19:05:34 2020 +0200
+++ b/src/linetypes/quadrilateral.h	Tue Mar 17 23:13:29 2020 +0200
@@ -22,5 +22,7 @@
 	QString textRepresentation() const override;
 	void getPolygons(std::vector<gl::Polygon>& polygons, GetPolygonsContext* context) const override;
 	void invert() override;
+	int numPoints() const override;
+	const glm::vec3& getPoint(int index) const override;
 	glm::vec3 points[4] = {{}};
 };