door that closes by itself

Hey! I have created this script for opening doors that you can download for free, it is well documented and is useful to read. It uses Raycasting to rotate a door!

https://www.assetstore.unity3d.com/en/#!/content/38694

For the automatic closing, you could create a trigger zone using a collider. On that trigger zone you then need to use a script that checks when the user has entered using the function 'OnColliderEnter' or 'OnColliderStay'. Using that function you can send a 'message' to your door script saying that it has to close the door. That's basically the method you could use to achieve the automatic closing of your door.

You could also use a timer instead of working with a trigger zone: see KillerOfSteam7's answer.

the easiest method I could think of is simply using Quaternion.Euler(x, y, z) and some coroutines like this...

 public float DoorOpenAngle = 90f; // the value of the y-axis when the door is open
 public float DoorClosedAngle = 0f; // the value of the y-axis when the door is closed
 public bool IsOpen = false;

 public IEnumerator AutoClose ()
 {
     yield return new WaitForSeconds (10f); // set it to whatever you like...
     transform.rotation = Quaternion.Euler(0f, DoorClosedAngle, 0f);
 }

 private void SwitchDoor ()
 {    
     if (!IsOpen)
     {            
         var _openRotation = Quaternion.Euler(0f, DoorOpenAngle, 0f);
         transform.rotation = _openRotation;
         IsOpen = true;        
     StartCoroutine(AutoClose()); // call these here and the door will close after 10 seconds...
     } else if (IsOpen)
     {    
         var _closedRotation = Quaternion.Euler(0f, DoorClosedAngle, 0f);
         transform.rotation = _closedRotation;
         IsOpen = false;    
     }    
 }

then call it with raycasting as follows...

 private void Update ()
 {
     var Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     var Hit = new RaycastHit()
 
     if (Physics.Raycast(Ray, out hit))
     {
         // you can do this with you own method of checking
         if (Hit.transform.gameObject.tag == "Door") 
         {
             Hit.transform.gameObject.SendMessage("SwitchDoor");
         }
     }    
 }