Camera.allCameras

public static Camera[] allCameras ;

説明

シーン内の有効なすべてのカメラを返します。

using UnityEngine;
using System.Collections;

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