Matt Smith wrote:
I can't quite get my head around WHY the ball sinks into the ground if I don't set ypos back to 384 but it certainly works.
It's probably because you're applying gravity to the ball even when it's touching the ground. So it repeatdly gets accelerated downwards for one time step, then moved back up to ground level. In real life, when the ball is touching the ground, the downward force of gravity is balanced by an upward force from the ground, so the net acceleration is zero. You can model that by only applying gravity if the ball is above ground level. -- Greg
