--- a/include/shapes.h	Thu Apr 24 10:49:11 2008 +0200
+++ b/include/shapes.h	Thu Apr 24 13:55:11 2008 +0200
@@ -132,6 +132,7 @@
 public:
 	Vector3 P;
 	Vertex(const Vector3 &aP): P(aP) {};
+	virtual ~Vertex() {};
 	virtual ostream & dump(ostream &st) const;
 };