title: How to endlessly spawn an object in Unity
body: <p>I am new in Unity. I like to know resources to the following problem: in every (say 3 second) a cube will spawn in the sky, and will drop in the ground, the process will continue with no ending.</p>
  <p>I have to use some loop, but problem is that how to spawn repeatedly. I think for a game developer, it is very easy, so thanks for any help.</p>