I'm trying to make a game where a entity can walk normally on a vertical wall.
But i found a big problem...when the tilt of the entity is 90 (on the wall), the pan angle, wich doesn't rotate along with the entity, becomes equal to roll angle. So when using left/right arrows, the entity doesn't turn normally, but rolls as if I changed the roll angle.
There are ways to fix this?

(sorry for the bad english...and ask if something isn't clear )