If you do /effect 1 1000000 (or any number for that matter) 127 for speed 127, and stand up against a wall, you can see through it. Tested with quake pro fov and normal but, this only happened with quake pro.
MC-12167
Seeing through walls
Resolved
Duplicate
0
Zach Hammitt
(Unassigned)
Unconfirmed
seeing, walls
Minecraft 1.5
Retrieved
Duplicate of MC-11684, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.