Invisible or hidden edges only really apply to modeling software. Often the direction of the hidden edges is determined by the program, for example Maya forces all hidden edges to flow in a certain direction so if you want to flip a hidden edge you have to force it to be visible. In Max you can flip hidden edges any way…
Hello, Simple question : why subdivide a quad into 2 tris? Example : Last images showing wireframes I do not own this image, it was taken from this thread which I recommend taking a look at : http://www.polycount.com/forum/showthread.php?p=1321690#post1321690 Thanks!