Input.GetTouch Triggering Twice

Hi all. I'm having a problem with Input.GetTouch. As you can see by the title, it triggers twice every time the screen is touched. Here is my script:

Code (csharp):

1.  
2. function Update () {
3.     for (var i = 0; i < Input.touchCount; ++i) {
4.         if (Input.GetTouch(i).phase == TouchPhase.Began) {
5.             var hit : RaycastHit;
6.             var ray = Camera.main.ScreenPointToRay (Input.GetTouch(i).position);
7.             if (Physics.Raycast (ray, hit)) {
8.             hit.transform.gameObject.SendMessage("OnMouseDown", SendMessageOptions.DontRequireReceiver);
9.           }
10.        }
11.    }
12. }
13.  

What can I do to fix this and have Input.GetTouch trigger only once? All help is appreciated.
Thanks.

 

Does 'Began == Touched in the last update' - if that's not the case then it would explain this as the state could be Began for several updates.

Often when I get double triggers it's becuase I've done something silly like attach the script twice.

 

Thank you for your advice, but I believe Began is only called during the frame the finger touches the screen, so it should only be called once every touch. Also, unfortunately, the problem was not a careless error like attaching the script twice.

 

Set a short delay at the beginning of your touch event handling, and enclose it in an if statement that checks to see if that delay has expired...

pseudo code:

Code (csharp):

1.  
2.  
3. if (Time.time >= delay)
4. {
5.  delay = Time.time+.1;
6.  do stuff here;
7. }
8.  

 

What is the debug output if you add the following.

Code (csharp):

1. function Update () {
2.     Debug.Print("Update Starting");
3.     for (var i = 0; i < Input.touchCount; ++i) {
4.         if (Input.GetTouch(i).phase == TouchPhase.Began) {
5.             var hit : RaycastHit;
6.             var ray = Camera.main.ScreenPointToRay (Input.GetTouch(i).position);
7.             if (Physics.Raycast (ray, hit)) {
8.             Debug.Print(string.format("Input count = {0}", i));
9.             hit.transform.gameObject.SendMessage("OnMouseDown", SendMessageOptions.DontRequireReceiver);
10.           }
11.        }
12.    }
13. }

 

Debug.Print doesn't exist so I changed both of them to Debug.Log. I also capitalized String.Format. The only debug messages I got were "Update Starting." I didn't get any others, even when tapping the screen.

 

@Tessaran
I tried something like that already and it broke the script.

 

Sorry for the bad formatting of the Debug statements - I wasn't infront of an editor when I put it together and should have mentioned that.

If the input count string is never coming out then what is being triggered twice? You shouldn't be able to get to the SendMessage function without passing through that?

 

I figured out the problem. I've been using Unity Remote on my iPhone, but that just acts the same as using a mouse, so having the OnMouseDown function called both when tapping and from the raycast script caused it to be triggered twice. Would it be called after exporting the app, or would I need to use the raycast script?

 

I've found that the iPhone does respond to mouse events but they can't be trusted. For example the documentation says that OnMouseDown has no effect on the iPhone but I have found it does.

 

On my, that's also my silly problem. Cannot believe this.