Is there a way to have an object, a ball for example, fall down and bounce up, using rigid body dynamics, but with its movement locked to two axes? So basically that would make for a 2 dimensional simulation.
I tried using a generic rigid body constraint but that doesn't seem to do anything when I lock a single axis. Now I'm faking it by putting the ball between four planes, in a box basically. Although there should be a better way to achieve this.