touch position to world position 2D

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How can I transform the touch position (On phones) to world position.
For instance if my phone’s screen size is 1440 by 2560 and my touch position on the phone is X 600 Y 700. How can I transform that position to world position on unity?

I need that so I can know where the user put his finger.

2 Answers

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There is no true 2D position. Even when using 2D features, positions are still 3D. For 2D, Orthographic camera, with rotation (0,0,0) you can do:

 var pos = Camera.main.ScreenToWorldPoint(touchposition);
 pos.z = transform.position.z;

This will be the finger position at the ‘z’ position of the object with the script.

You did not get me. I am using android, not pc. the x and y are different. I can not just put it in this code.

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So you pass the position of the touch. You don't provide your touch code, so I cannot provide the exact code, but the concept is the same. You get a screen position and call ScreenToWorldPoint() to get the world position.

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Vector3 screenPos = new Vector3(Input.mousePosition, Input.mousePosition, 10);
Vector3 worldPos = Camera.main.ScreenToWorldPoint(screenPos);

worldpos will be a world point where you touched, 10 meters from the camera.

solved my problem. Thanks !!

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