screenQuad.cs

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using UnityEngine;
using System.Collections;

public class screenQuad : MonoBehaviour {
    
    public RenderTexture renTex;
    public WebCamTexture webcamTexture;

    public int width = 0;
    public int height = 0;

    void Awake () {

        var deviceName = "";
        if(WebCamTexture.devices.Length>1)
            deviceName = WebCamTexture.devices[1].name;
        else
            deviceName = WebCamTexture.devices[0].name;

        webcamTexture = new WebCamTexture(deviceName, 1280, 720, 30);

        webcamTexture.Play();
    }
    
    void Update () {
        Graphics.Blit (webcamTexture, renTex);
    }
}