#5 Compute partial texels

[Eric Paquette]

The texels along the silhouete of the faces in texture space are sometimes not computed. This happens because the method currently only computes texels for which the center lies in a face. The method should be changed to also include texels for which the center lies in none of the faces, but for which a corner of the texel lies in one of the faces. This would be simple to implement and will cover most cases.