Question

JavaScript => ViewportPointToRay(position: Vector3): Ray;
C# => Ray ViewportPointToRay(Vector3 position);

Description 描述

Returns a ray going from camera through a viewport point.

返回从相机出发穿过视点的一个射线。

Resulting ray is in world space, starting on the near plane of the camera and going through position's (x,y) coordinates on the viewport (position.z is ignored).

产生的射线是在世界空间中，从相机的近裁剪面开始并穿过视口POSITION(x,y)坐标（position.z被忽略）

Viewport coordinates are normalized and relative to the camera. The bottom-left of the camera is (0,0); the top-right is (1,1).

视窗坐标被规范化，并相对于相机。相机的左下为（0,0）；右上是（1,1）。

JavaScript:

	// Prints the name of the object camera is directly looking at	function Update () {
		// Get the ray going through the center of the screen
		var ray : Ray = camera.ViewportPointToRay (Vector3(0.5,0.5,0));
		// Do a raycast
		var hit : RaycastHit;
		if (Physics.Raycast (ray, hit))
			print ("I'm looking at " + hit.transform.name);
		else
			print ("I'm looking at nothing!");
	}

C#:

using UnityEngine;
using System.Collections;
 
public class ExampleClass : MonoBehaviour {
    void Update() {
        Ray ray = camera.ViewportPointToRay(new Vector3(0.5F, 0.5F, 0));
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
            print("I'm looking at " + hit.transform.name);
        else
            print("I'm looking at nothing!");
    }
}

Camera