Time for action – bouncing ball

1. Open ch5_BouncingBalls.html in your HTML5-enabled Internet browser.

2. The orbiting camera is activated by default. Move the camera and you will see how all the objects adjust to the global transform (camera) and yet they keep bouncing according to its local transform (bouncing ball).

   

3. Let's explain here a little bit more in detail how we keep track of each ball.

   • First of all let's define some global variables and constants:

     var ball = [];        //Each element of this array is a ball
     var BALL_GRAVITY = 9.8;  //Earth acceleration 9.8 m/s2
     var NUM_BALLS = 50;      //Number of balls in this simulation

   • Next, we need to initialize the ball array. We use a for loop in the load function to achieve it:

     for (var i=0;i<NUM_BALLS;i++){
            ball.push(new BouncingBall());
            Scene.loadObject('models/geometry/ball.json','ball'+i);
     }

   • The BouncingBall function initializes the simulation variables for each ball in the ball array. One of this attributes is the position, which...