Opening a door with a key

Question

I have got a script that works to unlock and open a door, but I was wondering if there is a way to pick up a key first to open the door and it won't work without that key. I can show you the code I have already, please let me know how I can do this.

 //Player:
 var doorScript : Door;
 
 function Update () {
     var hit : RaycastHit;
     Debug.DrawRay(transform.position, transform.forward * 2, Color.red);
     if (Physics.Raycast(transform.position, transform.forward, hit, 2)) {
         if ((hit.collider.gameObject.tag == "Door") && (Input.GetButtonUp("Action") ) ) {
             if (doorScript.doorState == DoorStates.locked) {
                 doorScript.doorState = DoorStates.unlocked;    
             } else if (doorScript.doorState == DoorStates.unlocked) {
                 doorScript.Open();
             }
         }
     }
 }
 
 //Door Trigger:
 var doorScript : Door;
 
 function OnTriggerEnter (col : Collider) {
     if ((col.gameObject.tag == "MainCamera") && (doorScript.doorState == DoorStates.unlocked) ) {
         doorScript.Open();
     }
 }
 
 //Door:
 enum DoorStates {open, unlocked, locked};
 var doorState : DoorStates;
 
 function Awake() {
     doorState = DoorStates.locked;
 }
 
 function Update () {
     Debug.Log(doorState);
 }
 
 function Open() {
     animation.Play("Open");
     doorState = DoorStates.open;
 }

Answer 1

Answer by BiG · Apr 24, 2012 at 05:39 PM

You have to assign a boolean variable to your Player, that says if the key has been already picked up or not. At the beginning this variable will be equal to false; When the Player enters in a collision with the key, it will turns into true. Then, you add this variable's truth as a mandatory event to open the door. Something like this:

 //Player:
 var doorScript : Door;
 var have_key = false;
 
 function Update () {
     var hit : RaycastHit;
     Debug.DrawRay(transform.position, transform.forward * 2, Color.red);
     if (Physics.Raycast(transform.position, transform.forward, hit, 2)) {
        if ((hit.collider.gameObject.tag == "Door") && (Input.GetButtonUp("Action") ) ) {
          if (doorScript.doorState == DoorStates.locked) {
           doorScript.doorState = DoorStates.unlocked; 
          } else if (doorScript.doorState == DoorStates.unlocked && have_key) {
           doorScript.Open();
          }
        }
     }
 }

 function OnCollisionEnter (theCollision : Collision){
     if (theCollision.gameObject.tag == "Key")
        have_key=true;
 
 }

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Fabkins · Apr 24, 2012 at 05:47 PM 0

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@BiG - you want to check this code your wrote:

         if (doorScript.doorState == DoorStates.locked) {
            doorScript.doorState = DoorStates.unlocked; 
        } else if (doorScript.doorState == DoorStates.unlocked && have_key) {
           doorScript.Open();
         }

Think should read:

         if (doorScript.doorState == DoorStates.locked && have_key)  {
            doorScript.doorState = DoorStates.unlocked; 
        } else if (doorScript.doorState == DoorStates.unlocked ) {
           doorScript.Open();
         }

cycoclash25 · Apr 24, 2012 at 05:49 PM 0

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Okay, thanks, i'll give it try

cycoclash25 · Apr 25, 2012 at 04:10 PM 0

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I can't seem to get the collision with the key to activate, any suggestions?

Answer 2

Answer by Fabkins · Apr 24, 2012 at 05:38 PM

Well all you need is another variable:

     Player: var doorScript : Door;

     var hasKey: boolean=false;

     function foundAKey()
     {
     hasKey=true;
     }


     function Update () 
     { 
     var hit : RaycastHit; 
     Debug.DrawRay(transform.position, transform.forward * 2, Color.red); 

     if (Physics.Raycast(transform.position, transform.forward, hit, 2)) 
         { 
             if ((hit.collider.gameObject.tag == "Door") && (Input.GetButtonUp("Action") ) ) 
             { 
                 if (doorScript.doorState == DoorStates.locked && hasKey )  <-----
                 { 
                     doorScript.doorState = DoorStates.unlocked; 
                 } else if (doorScript.doorState == DoorStates.unlocked) 
                 { 
                     doorScript.Open(); 
                 } 
             } 
         } 
     }

     Door Trigger: var doorScript : Door;

     function OnTriggerEnter (col : Collider) 
     { 
         if ((col.gameObject.tag == "MainCamera") && (doorScript.doorState == DoorStates.unlocked) ) 
         { 
             doorScript.Open(); 
         } 
     }

     Door: enum DoorStates {open, unlocked, locked}; var doorState : DoorStates;

     function Awake() { doorState = DoorStates.locked; }

     function Update () { Debug.Log(doorState); }

     function Open() { animation.Play("Open"); doorState = DoorStates.open; }

Then have another object that is a key that when is picked up calls "foundAKey()".

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Fabkins · Apr 24, 2012 at 05:42 PM 0

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Note this is a two sequence action as coded. The first action on the locked door unlocks it and the second action opens the door.

Give your key object a similar script that does a ray cast.

PS I would probably also not do the Raycast test this way if you had lots of doors this could get computationally expensive. I would have a player routine that does a raycast and detects what it hits. Then depending on the type of object perform the appropriate action.

cycoclash25 · Apr 24, 2012 at 05:47 PM 0

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I have no idea what a raycast is, and I see no reason why money is an issue. I suck at coding, so i'm not exactly sure how to go about doing that

Fabkins · Apr 24, 2012 at 05:49 PM 0

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Well dont worry about it for now. Get something working and optimise later. Enjoy :)

Opening a door with a key

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