diff -u -r1.2 -r1.3
--- PolyconeTest.java	18 Feb 2008 23:25:50 -0000	1.2
+++ PolyconeTest.java	24 Jun 2008 19:08:15 -0000	1.3
@@ -73,6 +73,19 @@

         double diff = Math.abs(v3 - realv3);
         assertTrue( diff < TOLERANCE) ;
         

+        
+        
+        p1 = new ZPlane(4,5,-100);
+        p2 = new ZPlane(4,5,100); 
+
+        l1.clear();
+        l1.add(p1);
+        l1.add(p2);
+        pc1 = new Polycone("Another tube with pc class",l1);
+        Tube t2 = new Tube("Another tube",4,5,100); 
+        assertTrue(Math.abs(t2.getCubicVolume()-pc1.getCubicVolume())<TOLERANCE); 
+    
+        

     }
 
     

diff -u -r1.5 -r1.6
--- Polycone.java	6 Jun 2008 00:22:56 -0000	1.5
+++ Polycone.java	24 Jun 2008 19:08:15 -0000	1.6
@@ -112,7 +112,7 @@

                     double a2 = zplanes.get(i).rmin;
                     double b2 = zplanes.get(i).rmax;
 

-                    double dv = Math.PI/(3.0)*(z2-z1)*(b2*b2 + b1*b2 + b1*2 - a2*a2 - a2*a1 - a1*a1);

+                    double dv = Math.PI/(3.0)*(z2-z1)*(b2*b2 + b1*b2 + b1*b1 - a2*a2 - a2*a1 - a1*a1);

                     vol+=Math.abs(dv);
                     z1=z2;  
                     a1=a2;