In your program, your ball dropped. What condition made the ball stop when it reached the origin of the axes you had drawn?

The ball stops at the origin when its vertical position reaches y = 0. The condition `while ball.pos.y > 0` keeps the ball moving only while it is above the origin, so the loop ends when it reaches that height. The x- and z-coordinates describe other directions, and `ball.pos` is a vector rather than a single coordinate.

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