POLYGONAREA3D Area of a 3D polygon.

   AREA = polygonArea3d(POLY)
   POLY is given as a N-by-3 array of vertex coordinates. The resulting
   area is positive.
   Works also for polygons given as a cell array of polygons.

   Example
     % area of a simple 3D square 
     poly = [10 30 20;20 30 20;20 40 20;10 40 20];
     polygonArea3d(poly)
     ans =
        100

     % Area of a 3D mesh
     [v f] = createCubeOctahedron;
     polygons = meshFacePolygons(v, f);
     areas = polygonArea3d(polygons);
     sum(areas)
     ans =
         18.9282

   See also
     polygons3d, triangleArea3d, polygonArea, polygonCentroid3d

Package: matgeom