MESHVERTEXNORMALS Compute normals to a mesh vertices.

   N = meshVertexNormals(V, F)
   Computes vertex normals of the mesh given by vertices V and F. 
   V is a vertex array with 3 columns, F is either a NF-by-3 or NF-by-4
   index array, or a cell array with NF elements.

   Example
     % Draw the vertex normals of a sphere
     s = [10 20 30 20];
     [v f] = sphereMesh(s);
     figure; drawMesh(v, f);
     view(3);axis equal; light; lighting gouraud;
     normals = meshVertexNormals(v, f);
     drawVector3d(v, normals*2);

   See also
     meshes3d, meshFaceNormals, triangulateFaces

Package: matgeom