I have a face and I want to select a group of point on in to do a transformation. I try to use a Box selection and it selects all point on front and on back of the head. Is there a way to select only the visible point of this viewport? only the frontal points of the selection?
Yes, there is a way. Use the Lasso or Brush selection instead of Box. RMB on the Cursor button to change mode. Also, make sure you're not in Wireframe display mode so Hidden Line or Flat Shaded or Smooth Shaded etc will work.
