@supernovafiles@SirLich Lets say you want to do anything more than the most simple possible movement.
You will soon notice than velocity does not get updated vertically at all. If you move against a ramp and now your velocity is almost vertical, all the vertical motion is lost because is actually never computed in first place.
So you are expected to use get real velocity. Get real velocity is as i said a particle approach that will cause all kind of problems.