Destroying objects when fading is complete

If fading to invisible is how a GameObject communicates to the player that it is leaving the scene (completed/dying), then we may want that GameObject to be destroyed after the fading process is completed. Let's add this feature to our code.

Do the following:

1. Add a new public Boolean variable to our script (default to false):

public bool destroyWhenFadingComplete = true; 

2. Add a new EndFade() method that sets isFading to false and then tests whether the public destroyWhenFadingComplete variable was set to true and, if so, destroys the GameObject:

private void EndFade() {
 isFading = false;
 
 if(destroyWhenFadingComplete)
 Destroy (gameObject);
 } 

3. Refactor the FadeAlpha() method so that it invokes EndFade() when the fading is completed (fadeProgress >= fadeDurationSeconds):

    private void FadeAlpha()
     {
         float fadeProgress = Time.time - startTime...