シーン内の有効なすべてのカメラを返します。
All cameras in the scene can be enabled or disabled. The allCameras value tells how many cameras are still enabled. If all the cameras are disabled then a value of zero will be returned.
using UnityEngine;
public class ExampleScript : MonoBehaviour { private int count;
void Start() { count = Camera.allCameras.Length; print("We've got " + count + " cameras"); } }