[Python] Fix DistanceResult::normal

include/hpp/fcl/collision_data.h

@@ -303,6 +303,9 @@ struct DistanceRequest
   {
   }
 
+  /// \param enable_nearest_points_ enables the nearest points computation.
+  /// \param rel_err_
+  /// \param abs_err_
   DistanceRequest(bool enable_nearest_points_ = false,
                   FCL_REAL rel_err_ = 0.0,
                   FCL_REAL abs_err_ = 0.0) :

python/distance.cc

@@ -89,7 +89,10 @@ void exposeDistanceAPI ()
     class_ <DistanceResult> ("DistanceResult",
         doxygen::class_doc<DistanceResult>(), init<>())
       .DEF_RW_CLASS_ATTRIB (DistanceResult, min_distance)
-      .DEF_RW_CLASS_ATTRIB (DistanceResult, normal)
+      .add_property("normal",
+          make_getter(&DistanceResult::normal, return_value_policy<return_by_value>()),
+          make_setter(&DistanceResult::normal, return_value_policy<return_by_value>()),
+          doxygen::class_attrib_doc<DistanceResult>("normal"))
       //.def_readwrite ("nearest_points", &DistanceResult::nearest_points)
       .def("getNearestPoint1",&DistanceRequestWrapper::getNearestPoint1,
           doxygen::class_attrib_doc<DistanceResult>("nearest_points"))