Camera.ScreenToWorldPoint

描述

将 position 从屏幕空间变换为世界空间。

屏幕空间以像素定义。屏幕的左下角为 (0,0)，右上角 为 (pixelWidth,pixelHeight)。z 位置为与摄像机的距离，采用世界单位。

// Convert the 2D position of the mouse into a
// 3D position.  Display these on the game window.

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();
    }
}