SUPPORTFUNCTION Compute support function of a polygon.
 
   H = supportFunction(POLYGON, N)
   uses N points for suport function approximation

   H = supportFunction(POLYGON)
   assume 24 points for approximation

   H = supportFunction(POLYGON, V)
   where V is a vector, uses vector V of angles to compute support
   function.
   
   See also:
   polygons2d, convexification

   ---------
   author : David Legland 
   INRA - TPV URPOI - BIA IMASTE
   created the 20/12/2004.

Package: matgeom