add default trait that uses double precision

src/OpenMesh/Core/Mesh/Traits.hh

@@ -152,6 +152,24 @@ struct DefaultTraits
   FaceAttributes(0);
 };
 
+/** \class DefaultTraitsDouble Traits.hh <OpenMesh/Mesh/Traits.hh>
+
+    Version of Default Traits that uses double precision for points and
+    normals as well as floating point vectors for colors
+
+    \see The Mesh docu section on \ref mesh_type.
+    \see Traits.hh for a list of macros for traits classes.
+*/
+struct DefaultTraitsDouble : public DefaultTraits
+{
+  /// Use double precision points
+  typedef OpenMesh::Vec3d Point;
+  /// Use double precision Normals
+  typedef OpenMesh::Vec3d Normal;
+  /// Use RGBA Color
+  typedef OpenMesh::Vec4f Color;
+};
+
 
 //== CLASS DEFINITION =========================================================