Version: 2017.2

Camera.ViewportPointToRay

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public Ray ViewportPointToRay (Vector3 position);

描述

返回从摄像机通过视口点的光线。

产生的光线位于世界空间中,从摄像机的近平面开始,并通过视口上 位置的 (x,y) 坐标(忽略 position.z)。

视口坐标是标准化的、相对于摄像机的坐标。摄像机左下角为 (0,0),右上角为 (1,1)。

// Prints the name of the object camera is directly looking at
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { Camera cam;

void Start() { cam = GetComponent<Camera>(); }

void Update() { Ray ray = cam.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!"); } }