Unity touch controls, accurate finger following

Question

Hi, I'm recently new to Unity and touch controls, I have been following the Unity scripting API's and found this piece of code:

 // Moves the object according to finger movement on the screen
 
 var speed : float = 0.1f;
 
 function Update()
 {
     if(Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved)
     {
         
         //Get movement of the finger since the last frame
         var touchDeltaPosition : Vector2 = Input.GetTouch(0).deltaPosition;
         
         // Move object across the X and Y plane
         transform.Translate (-touchDeltaPosition.x * speed, touchDeltaPosition.y * speed, 0);
     }
 }

This manages what I want to achieve, the problem is, the object doesn't accurately follow my finger, sometimes it will be too fast or sometimes it will be too slow, I would like it to stay underneath my finger at all times without straying off. The speed variable doesn't seem to make much of a difference.

Here is a video to the problem I'm having, hopefully give people and idea of what's wrong: https://www.youtube.com/watch?v=9g_BHnaz7f4&feature=youtu.be

Is there a way I can accomplish this?

Answer 1

Best Answer

Answer by JayFitz91 · Jun 24, 2014 at 08:48 PM

 #pragma strict
 
 private var pos : Vector3;
 
 function Start () {
 
 }
 
 function Update()
 {
     
     pos = Camera.main.ScreenToWorldPoint (Vector3 (Input.GetTouch(0).position.x, Input.GetTouch(0).position.y, 5));
     
     transform.position = new Vector3(pos.x, pos.y, pos.z);
 }

Thanks Andres Fernandez, I was playing around for a while and managed to get it working with Camera.main.ScreenToPointWorld and Input.GetTouch(0)

As of now, I have it following my finger on the x and y axis with a fixed z position, should I improve upon this, I will update my answer.

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Andres-Fernandez · Jun 25, 2014 at 06:29 AM 0

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Cool. Good job.

KasunL · Dec 09, 2015 at 02:35 AM 0

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Working! Thanks!

Ams0 · Aug 03, 2016 at 01:06 PM 0

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First off, your code crashes at the start. Since there is no touch right at the first update call, and GetTouch(0) returns OutOfBoundException. $$anonymous$$oving on, when inserting your code into an "if" statement to make sure the above exception doesnt get thrown, it still wont do what its suppose to do! I have absolutely zero clue to how Andres or $$anonymous$$asunL found your solution as "good job" or "working!". $$anonymous$$y clear frustration rises from misinformation. Please update if you have a correct solution or refrain from wasting others time. Thanks!

afors Ams0 · Aug 11, 2016 at 05:52 PM 0

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When inserting an "if" statement to avoid crash, this code behaves just like I want it to. Ams0 maybe you're missing something else?

Ams0 afors · Aug 14, 2016 at 08:41 AM 0

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could you please care to point it out "if" I am missing something? That infact could help (as opposed to just pointing it out)

Answer 2

Answer by Andres-Fernandez · Jun 24, 2014 at 01:20 PM

The problem is that this code moves the object based on the movement of the finger, but it doesn't make the object follow the finger.

If you want the object to follow the finger you need to:

Get the coordinates of the finger in world space (instead of screen, which is what the touch gives you). You can use ScreenToWorldPoint (or similar) and touch.position.
Make the object translate to that position over time (Using something like SmoothDamp)

Try that and let us know.

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JayFitz91 · Jun 24, 2014 at 08:48 PM 1

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Added an answer with a possible solution, thanks

Unity touch controls, accurate finger following

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