diff --git a/ShoulderCase/@Sphere/Sphere.m b/ShoulderCase/@Sphere/Sphere.m
index 23a5975..65e01da 100644
--- a/ShoulderCase/@Sphere/Sphere.m
+++ b/ShoulderCase/@Sphere/Sphere.m
@@ -1,35 +1,39 @@
 classdef Sphere < handle
 % Simple sphere object.
 % Used to be fitted to glenoid points.
 % 
 % This class could be used elsewhere and the constructor
 % access might be widen.
 
   properties
     center
     radius
     residuals
     R2
     RMSE
   end
 
-  methods (Access = ?Glenoid)
+  methods
     function obj = Sphere()
       obj.center            = [];
       obj.radius            = [];
       obj.residuals         = [];
       obj.R2                = [];
       obj.RMSE              = [];
     end
 
     function fitTo(obj,points)
       [center,radius,residuals,R2] = fitSphere(points);
       obj.center            = center';
       obj.radius            = radius;
       obj.residuals         = residuals;
       obj.R2                = R2;
       obj.RMSE              = norm(residuals)/sqrt(length(residuals));
     end
+
+    function output = isempty(obj)
+      output = any(cellfun(@(field)isempty(obj.(field)),fields(obj)));
+    end
   end
 
 end