Level editor – adding/removing walls at runtime

Now that our level editor will be able to load in this data, we now want to have a way to actually modify what we see onscreen. To do this, we'll need to create a GUI interface and functionality for our level editor.

1. The first thing we need to do is add a variable to keep track of what item we want to spawn:

   //The object we are currently looking to spawn
   Transform toCreate;

2. Now, we need to initialize this variable inside our Start function:

   toCreate = tiles[0];

3. Next, we need to update our Update function and then explain how it's working, as follows:

   void Update()
   {
     // Left click - Create object
     if (Input.GetMouseButton(0) && GUIUtility.hotControl==0)
     {
       Vector3 mousePos = Input.mousePosition;
   
       //Set the position in the z axis to the opposite of the 
       // camera's so that the position is on the world so 
       // ScreenToWorldPoint will give us valid values.
       mousePos.z = Camera.main.transform.position.z * -1;
   
       Vector3...