calc_sector_angle: Check for real division by zero not with epsilon that was way to large

Doc/changelog.docu

@@ -24,6 +24,7 @@
 <li>Added 1-4 triangle split funtion(splits all edges at Midpoints)</li>
 <li>Boost range support (Thanks to Bastian Pranzas for the patch)</li>
 <li>Made the face and edge split operations that copy properties also copy builtin properties</li>
+<li>calc_sector_angle: Check for real division by zero not with epsilon that was way to large</li>
 </ul>
 
 <b>Utils</b>

src/OpenMesh/Core/Mesh/PolyMeshT.hh

@@ -445,7 +445,7 @@ public:
     Normal v0, v1;
     calc_sector_vectors(_in_heh, v0, v1);
     Scalar denom = v0.norm()*v1.norm();
-    if (is_zero(denom))
+    if ( denom == Scalar(0))
     {
       return 0;
     }