I'm following an architectural modeling tutorial, where the first step is to trace out the floor plane using the line tool in Max.
In the video the guy turns on snapping and slides a vert along an axis so it lines up with one above. When I turn on snapping and attempt to slide the vert so it aligns with the vert above, it doesn't remain constrained to the desired axis despite using the handle on the manipulator.
GIF showing the issue:
http://gfycat.com/NaturalCarefreeKouprey Does anyone know what I may be doing wrong? Thanks.