unity WebCam 手机自适应 摄像头

using UntyEngine;
using System.Collections;
using UnityEngine.UI;

public class MobileCam : MonoBehaviour
{

    private bool camAvailable;
    private WebCamTexture cameraTexture;
    private Texture defaultBackground;

    public RawImage background;
    public AspectRatioFitter fit;
    public bool frontFacing;

    // Use this for initialization
    void Start()
    {
        defaultBackground = background.texture;
        WebCamDevice[] devices = WebCamTexture.devices;

        if (devices.Length == 0)
            return;

        for (int i = 0; i < devices.Length; i++)
        {
            var curr = devices[i];

            if (curr.isFrontFacing == frontFacing)
            {
                cameraTexture = new WebCamTexture(curr.name, Screen.width, Screen.height);
                break;
            }
        }

        if (cameraTexture == null)
            return;

        cameraTexture.Play(); // Start the camera
        background.texture = cameraTexture; // Set the texture

        camAvailable = true; // Set the camAvailable for future purposes.
    }

    // Update is called once per frame
    void Update()
    {
        if (!camAvailable)
            return;

        float ratio = (float)cameraTexture.width / (float)cameraTexture.height;
        fit.aspectRatio = ratio; // Set the aspect ratio

        float scaleY = cameraTexture.videoVerticallyMirrored ? -1f : 1f; // Find if the camera is mirrored or not
        background.rectTransform.localScale = new Vector3(1f, scaleY, 1f); // Swap the mirrored camera

        int orient = -cameraTexture.videoRotationAngle;
        background.rectTransform.localEulerAngles = new Vector3(0, 0, orient);
    }
}