Camera.allCameras 所有相机

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public int count = Camera.allCameras.Length;
	public void Awake() {
		print("We've got " + count + " cameras");
	}
}

var count : int = Camera.allCameras.Length;
print ("We've got " + count + " cameras");