Android Tutorial #59 Game Loop Fixed delta T (4\8) Physics Dependency On Frame Time Steps
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Here I show you how to detect the simple collision of our cannon ball with the wall and floor. I also show how that even in this very simple game example that if the frame rate is interrupted / slowed down your game play, for example, collision detection can go very wrong.
It a very good example of why we need a separate physics clock, and I will show you how to implement that in the next tutorial.