touch position to world position 2D

Questions & Answers
1

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

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.

3

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.