Wouldn't it be fun to actually play with these bouncy balls? Let's make a game where you aim the ball at a target using headshots. For this game, balls drop one at a time from above and bounce off your forehead (face), aiming for a target.
The feature we'll implement here is, when a ball drops from above your head, you bounce it off your face and aim for a target.
To implement this, create a cube as a child of the camera object. This provides a collider parented by the VR camera, so our head pose will move the face of the cube. I decided a cube-shaped collider will be better for this game than a sphere or capsule because it provides a flat face that will make the bounce direction more predictable. Balls will drop out of the sky. For a target, we'll use a flattened cylinder. We'll add audio cues to indicate when a new ball has been released and when a ball hits the target.
Create a new scene or, more simple, start here by doing a Save As, and implement the head as follows:
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