late 2:    { P :  &lt; P, ( 0, -1,  0) &gt; = 0 }
         %    Plate 3:    { P :  &lt; P, ( 0,  0, -1) &gt; = 0 }
         %    Plate 4:    { P :  &lt; P, ( 1,  1,  1) &gt; = 1 }
         %
         vrtces =[  [ 0.0, 0.0, 0.0 ]', ...
                    [ 1.0, 0.0, 0.0 ]', ...
                    [ 0.0, 1.0, 0.0 ]', ...
                    [ 0.0, 0.0, 1.0 ]'  ];

         plates =[ [ 1, 4, 3 ]', ...
                   [ 1, 2, 4 ]', ...
                   [ 1, 3, 2 ]', ...
                   [ 2, 3, 4 ]'  ]