diff --git a/vcg/space/triangle3.h b/vcg/space/triangle3.h
index df439bb2..1e9e24cd 100644
--- a/vcg/space/triangle3.h
+++ b/vcg/space/triangle3.h
@@ -419,6 +419,15 @@ typename TriangleType::ScalarType DoubleArea(const TriangleType &t)
 	return Norm( (t.P(1) - t.P(0)) ^ (t.P(2) - t.P(0)) );
 }
 
+template<class TriangleType>
+typename TriangleType::ScalarType CosWedge(const TriangleType &t, int k)
+{
+  typename TriangleType::CoordType 
+    e0 = t.P((k+1)%3) - t.P(k),
+    e1 = t.P((k+2)%3) - t.P(k);
+  return (e0*e1)/(e0.Norm()*e1.Norm());
+}
+
 template<class TriangleType>
 Point3<typename TriangleType::ScalarType> Barycenter(const TriangleType &t) 
 {