Unity3d，调用摄像头显示 先上代码

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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>();
        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：

[csharp] view plain copy

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> ();
        guiTexture.texture = webcamTexture;
        webcamTexture.Play ();
    }
}

如果在本机调试的时候出现以下错误提示

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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

[csharp] view plain copy

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


}