Originally posted by CommanderZx2:
I tried changing the angle of teleport destinations, but could not rotate the players axis more than 45 degrees in the x axis. Tried setting it to such values like 90 and 180, but it would only be rotated by 45 degrees. The y and z just appeared to alter the persons view temporary and the player could just move the mouse back to the normal position.
The problem with using func_useableladder is that if you were to jump.. you fall.
...Without re-coding the Player it is the only existing tweak, but as you noted it is not a true inversion, simply a close illusion, but enough possibly to work in most cases.
If they can help at all I created the following tutorials for HL2 mapping: