UnityでWebCamTextureをRenderTextureに突っ込むスクリプト

WebCamToRenderTexture.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WebCamToRenderTexture : MonoBehaviour {
	public int index;
	public RenderTexture targetTexture;
	//カメラの解像度，FPS
	public int width = 1920, height = 1080, fps = 30;
	int prevIndex;

	WebCamTexture webcamTexture;

	void Start () {
		prevIndex = index;
		SetWebCamTexture(index);
	}
	
	void Update () {
		if(index != prevIndex)
		{
			//利用可能だが，処理落ちするためコメントアウト
			//SetWebCamTexture(index);
		}
		//テクスチャをコピー
		Graphics.Blit(webcamTexture, targetTexture);

		prevIndex = index;
	}

	void SetWebCamTexture(int index)
	{
		if(webcamTexture != null && webcamTexture.isPlaying)
			webcamTexture.Stop();
		WebCamDevice[] devices = WebCamTexture.devices;
		try
		{
			webcamTexture = new WebCamTexture(devices[index].name, this.width, this.height, this.fps);
		}catch(System.Exception e)
		{
			webcamTexture = new WebCamTexture(devices[0].name, this.width, this.height, this.fps);
		}
        webcamTexture.Play();
	}
 
	//解像度を設定
	public void SetResolution(int w, int h)
	{
		width = w;
		height = h;
	}
}