I've briefly looked into physics engines and they seem to require a lot of trade-offs. If a rock meets a hard place, what should happen? Gamers have seen the hi

I've briefly looked into physics engines and they seem to require a lot of trade-offs. If a rock meets a hard place, what should happen? Gamers have seen the hilarity that can ensue. Designing your own engine allows you to make those trade-offs with the end goal in mind. You can do things like set global force or speed limits, because you know your game's design and the appropriate limits.