Unity5 Preview Selected Camera

CameraPreview.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

// taken from http://answers.unity3d.com/answers/312489/view.html and modified to C# Unity 5
// put it in editor folder
// select a camera then pressing Shift+C or in Window/Preview Selected Camera.
public class CameraPreview : EditorWindow 
{
	Camera camera;
	RenderTexture renderTexture;
	 
	[MenuItem("Window/Preview Selected Camera")]	 
	static void  Init (){
		EditorWindow editorWindow = GetWindow(typeof(CameraPreview));
		editorWindow.autoRepaintOnSceneChange = true;
		editorWindow.Show();
		editorWindow.titleContent.text = "Camera Preview";
	}
	 
	void  Awake ()
	{
		camera = FindObjectOfType<Camera>();
		CreateRenderTexture();
	}
	 
	 void  Update (){
		 if(camera != null) {
			 camera.targetTexture = renderTexture;
			 camera.Render();
			 camera.targetTexture = null;
		 }
		 if(renderTexture.width != position.width || renderTexture.height != position.height)
			 renderTexture = new RenderTexture((int)position.width, (int)position.height, 0, RenderTextureFormat.ARGB32);
	 }
	 
	 void  OnSelectionChange (){
		 GameObject obj = Selection.activeGameObject;
		 if (obj!=null && obj.GetComponent<Camera>()) camera = obj.GetComponent<Camera>();
		 CreateRenderTexture();
	 }
	 
	 void  CreateRenderTexture (){
		 renderTexture = new RenderTexture((int)position.width, (int)position.height, 0, RenderTextureFormat.ARGB32);
	 }
	 
	 void  OnGUI (){
		 GUI.DrawTexture(new Rect(.0f, .0f, position.width, position.height), renderTexture);    
	 }
}