Camera.ScreenToWorldPoint

using UnityEngine;public class ExampleClass : MonoBehaviour{    void OnGUI()    {        Vector3 p = new Vector3();        Camera  c = Camera.main;        Event   e = Event.current;        Vector2 mousePos = new Vector2();        // Get the mouse position from Event.        // Note that the y position from Event is inverted.        mousePos.x = e.mousePosition.x;        mousePos.y = c.pixelHeight - e.mousePosition.y;        p = c.ScreenToWorldPoint(new Vector3(mousePos.x, mousePos.y, c.nearClipPlane));        GUILayout.BeginArea(new Rect(20, 20, 250, 120));        GUILayout.Label("Screen pixels: " + c.pixelWidth + ":" + c.pixelHeight);        GUILayout.Label("Mouse position: " + mousePos);        GUILayout.Label("World position: " + p.ToString("F3"));        GUILayout.EndArea();    }}