fixed a DropCutter bug (exposed with SphericalCutter) that happens after scaling the model

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@903 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Geometry/Point.py

@@ -114,7 +114,7 @@ class Point(object):
         if n == 0:
             return None
         else:
-            return Point(self.x / n, self.y / n, self.z / n)
+            return self.__class__(self.x / n, self.y / n, self.z / n)
 
     def is_inside(self, minx=None, maxx=None, miny=None, maxy=None, minz=None,
             maxz=None):

src/pycam/Geometry/Triangle.py

@@ -65,6 +65,8 @@ class Triangle(TransformableContainer):
                     self.p1)).normalized()
         if not isinstance(self.normal, Vector):
             self.normal = self.normal.get_vector()
+        # make sure that the normal has always a unit length
+        self.normal = self.normal.normalized()
         self.center = self.p1.add(self.p2).add(self.p3).div(3)
         self.plane = Plane(self.center, self.normal)
         # calculate circumcircle (resulting in radius and middle)