Well, we mean just about anything that moves in the game is controlled by the physics engine. The idea is that if the entire game system is built around physics, you get a lot of interesting, intuitive, and sometimes even wacky interactions that arise emergently in the game. Here's a good example:
Some things to note here:- The player movement is controlled with physics forces
- The enemy's movement is controlled with physics forces
- Wall grabs are done by attaching actual breakable physics joints
- Wall grabs aren't specific to walls, you can grab anything (grab an enemy and slam it to the ground).
Flying enemies are driven by two main forces. There is
a predictive lift force in the direction of its local vector down, and there is
a predictive torque force which tries to maintain an upward direction. Those two forces alone combine to create an enemy that feels alive. When knocked up or down, it will attempt to propel itself back to its resting height. If hit with a tangential force which causes it to spin, it will attempt to straighten its rotation back to its resting state.
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