Time for action – tweaking the bounce

Now that we can detect when the heart is hitting the tray, there's no end to the fun we can have! While we're in the code, let's make a quick change to make the gameplay slightly better.

1. Double-click to open the HeartBounce script.

2. Type the following at the top of the script:

   #pragma strict
   var velocityWasStored = false;
   var storedVelocity : Vector3;
   function OnCollisionEnter(col : Collision) {
     if(col.gameObject.CompareTag("tray")) {
       Debug.Log("yes! hit tray!");
       if (!velocityWasStored) {
         storedVelocity = rigidbody.velocity;
         velocityWasStored = true;
       }
       rigidbody.velocity.y = storedVelocity.y;
     }
   }

Save the script and test the game. You may not notice a difference at first, but we've made a clear improvement to our mechanic.

What just happened – storing velocity

The trouble with Unity's physics simulation is that it's almost too good. Left to its own devices, our heart will bounce less and less until it eventually runs out of...