Unity 4.x Game Development by Example Beginner's Guide

Time for action – apocalypse now?

Enough prattle. It's bomb time!

1. Create a new JavaScript and name it Bomb. Drop it in the Scripts folder if you're keeping things tidy.
2. Open up the script and type the following code:

   function Update()
   {
     transform.position.y -= 50 * Time.deltaTime;
     if(transform.position.y < 0)
     {
       transform.position.y = 50;
       transform.position.x = Random.Range(0,60);
       transform.position.z = -16;
     }
   }
   

We've seen these keywords before, so there should be no surprises here. On every update cycle, move the bomb down in the y axis by 50 units per second:

transform.position.y -= 50 * Time.deltaTime;

If the bomb has fallen through the floor:

if(transform.position.y < 0) {

pop the bomb back up to the top of the apartment building:

transform.position.y ...