When one object with physics behavior(immovable- no) overlaps other object (immovable- yes), world gravity doesn't change.I Have this event:
spacebar is down-object set physics world gravity to -10.
Then the gravity only affects objects that don?t have other physics objects overlaping them.
Here's an example:
intel Core 2 quad Q66002,40 8gb ram
NVIDIA GeForce 8600gt