Version: 2017.2

Camera.ScreenPointToRay

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public Ray ScreenPointToRay (Vector3 position);

描述

返回从摄像机通过屏幕点的光线。

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

Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight).

// Draws a line in the scene view going through a point 200 pixels
// from the lower-left corner of the screen
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { Camera cam;

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

void Update() { Ray ray = cam.ScreenPointToRay(new Vector3(200, 200, 0)); Debug.DrawRay(ray.origin, ray.direction * 10, Color.yellow); } }