Physics Timing Issues

Original Question:

I am having a few issues with the the physics. I have a character that needs some basic platformer style physics (think Super Mario). Basically the little knight dude I have has the ability to jump and walk around. The problem is, that he can jump, but he jumps different heights on all machines.

Response:

You should have consistency, independent of OS or timings as long as the relative FPS differences are not too extreme. Although, even then, the differences shouldn´t be that noticable.