基于Unity3D的调用摄像头功能的实现

AR中会用到设备的摄像头，那么又如何去在Unity3D中去调用摄像头呢？

原地址：http://blog.csdn.net/wuyt2008/article/details/50684236

如下代码：

 using UnityEngine;
 using System.Collections;

 public class WebCamManager : MonoBehaviour {

     // Use this for initialization
     void Start () {

         WebCamTexture webcamTexture = new WebCamTexture ();

         //如果有后置摄像头，调用后置摄像头
         for (int i = 0; i < WebCamTexture.devices.Length; i++) {
             if (!WebCamTexture.devices [i].isFrontFacing) {
                 webcamTexture.deviceName = WebCamTexture.devices [i].name;
                 break;
             }
         }

         Renderer renderer = GetComponent();
         renderer.material.mainTexture = webcamTexture;
         webcamTexture.Play();
     }

 }

在场景里面添加一个plane

调整plane的位置，并把脚本拖上去，运行就可以了。

如果是要在GUITexture上显示，则代码如下：

 using UnityEngine;
 using System.Collections;

 public class WebCamManager : MonoBehaviour {

     // Use this for initialization
     void Start () {

         WebCamTexture webcamTexture = new WebCamTexture ();

         //如果有后置摄像头，调用后置摄像头
         for (int i = 0; i < WebCamTexture.devices.Length; i++) {
             if (!WebCamTexture.devices [i].isFrontFacing) {
                 webcamTexture.deviceName = WebCamTexture.devices [i].name;
                 break;
             }
         }

         GUITexture guiTexture = GetComponent ();
         guiTexture.texture = webcamTexture;
         webcamTexture.Play ();
     }
 }

如果在本机调试的时候出现以下错误提示

 Cannot use web cam, since the user has not authorized this!

这是没有使用摄像头的权限，build一次安卓应用再试就好了，或者使用以下代码，先判断权限

 using UnityEngine;
 using System.Collections;

 public class WebcamManager : MonoBehaviour {

     // Use this for initialization
     void Start () {
         StartCoroutine ("CallWebCam");
     }

     IEnumerator CallWebCam(){
         yield return Application.RequestUserAuthorization (UserAuthorization.WebCam);

         if (Application.HasUserAuthorization (UserAuthorization.WebCam)) {
             WebCamTexture webcamTexture = new WebCamTexture ();

             //如果有后置摄像头，调用后置摄像头
             for (int i = 0; i < WebCamTexture.devices.Length; i++) {
                 if (!WebCamTexture.devices [i].isFrontFacing) {
                     webcamTexture.deviceName = WebCamTexture.devices [i].name;
                     break;
                 }
             }

             GUITexture guiTexture = GetComponent ();
             guiTexture.texture = webcamTexture;
             webcamTexture.Play ();
         } else {
             Debug.Log ("has not authorization");
         }
     }
 }