ed_Input</a></h4>
<PRE>
 
   v1, 
   v2, 
   v3             are vertices of a triangular plate. 
                   </PRE>
<h4><a name="Detailed_Output">Detailed_Output</a></h4>
<PRE>
 
   normal         is an outward normal vector of the plate defined by 
                  the input vertices. The order of the vertices is 
                  used to determine the choice of normal direction: 
                  the normal vector is 
 
                     ( V2 - V1 ) x ( V3 - V2 ) 
                    </PRE>
<