Version: 2022.1

Camera.ScreenPointToRay

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public Ray ScreenPointToRay (Vector3 pos);
public Ray ScreenPointToRay (Vector3 pos, Camera.MonoOrStereoscopicEye eye);

参数

pos A 3D point, with the x and y coordinates containing a 2D screenspace point in pixels. The lower left pixel of the screen is (0,0). The upper right pixel of the screen is (screen width in pixels - 1, screen height in pixels - 1). Unity ignores the z coordinate.
eye 可选参数,可用于指定要使用的眼睛变换。默认值为 Mono。

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)。

屏幕空间以像素定义。屏幕的左下角为 (0,0),右上角为 (pixelWidth -1,pixelHeight -1)。

//Attach this script to your Camera
//This draws a line in the Scene view going through a point 200 pixels from the lower-left corner of the screen
//To see this, enter Play Mode and switch to the Scene tab. Zoom into your Camera's position.
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { Camera cam; Vector3 pos = new Vector3(200, 200, 0);

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

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