Why are snaps so restrictive when modeling masses?!

[gnarkill283]

Please see attached video. I got the 2 points I want to connect with a line. It snaps just fine for the first point but it won't snap for the second. WHY!!!!

[ToanDN · Accepted solution]

Turn on 3D Snapping.

[gnarkill283]

Of course its some obscure hidden thing...