It might sound very strange, but the script is doing what's supposed to: "Returns a list of faces not occluded, with normal facing camera direction". The faces that appear to be not selected in the farther end of the bent tube are actually occluded by the faces of the part of the tube closer to the camera. If a ray, cast…
Looks alike 'Duplicate face' is what you want... Take a look at the pics Shot at 2007-11-17 Shot at 2007-11-17 From simple cube, I selected a face (in face mode), and dupicated the face. In max, 'clone'(with 'copy' option) would be equivalent term. Then "combine" two objects (the simple cube and newly made face) first…