Camera.main.ScreenToWorldPoint return camera position

Question

Iam trying to get world co-ordinate from my screen touch position, all i have is a cube in my scene and i am attaching a script to it which will return world co-ordinate, here is the update function from script.

 function Update () {
 for (var touch:Touch in Input.touches) 
     {
     Debug.Log(touch.position +" "+Camera.main.ScreenToWorldPoint(Vector3(touch.position.x,touch.position.y,0f)));
     }
 }

and here is the kind of output iam getting

 (135.9, 235.5) (0.0, 18.0, 0.0)
 UnityEngine.Debug:Log(Object)
 TestIos:Update() (at Assets/Scripts/TestIos.js:26)
 (154.1, 226.7) (0.0, 18.0, 0.0)
 UnityEngine.Debug:Log(Object)
 TestIos:Update() (at Assets/Scripts/TestIos.js:26)
 (162.6, 223.1) (0.0, 18.0, 0.0)
 UnityEngine.Debug:Log(Object)
 TestIos:Update() (at Assets/Scripts/TestIos.js:26)

what is the issue or what i am doing wrong, ScreenToWorldPoint return (0,18,0) which is my main camera co-ordinate, please help me with this issue.

Answer 1

Best Answer

Answer by HarshadK · May 16, 2014 at 01:48 PM

Here's a question that discusses the same issue as yours: Camera Screen to world point returns cameras transform position

So basically the reason is that since you are providing 0 for the z there is no depth present.

So if you want to know the world position you have to provide z value for the depth at which you want the point from the world co-ordinate otherwise use raycasting.

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dyllandry · Jun 06, 2018 at 06:11 PM 1

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Helpful tip: If you store the return value of Camera.main.WorldToScreenPoint() in a Vector3, despite the z value being irrelevant in screen positioning, the z value required to convert back accurately to world space using Camera.main.ScreenToWorldPoint() is preserved.

Answer 2

Answer by chethanb · Nov 17, 2020 at 11:34 AM

Find the Y(up axis value) value of the camera and the plane in the world. Find the difference between them and use that as Z value in Camera.main.ScreenToWorldPoint(Vector3(touch.position.x,touch.position.y,Z)));

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Camera.main.ScreenToWorldPoint return camera position

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