Cameraの範囲を表示する

CameraRange.cs

using UnityEngine;
using System.Collections;

public class CameraRange : MonoBehaviour {

#if UNITY_EDITOR

	float depth = 10;
	public bool drawSubline = true;

	Vector3 leftTop, rightDown, rightTop, leftDown, forwardPosition;

	void PositionUpdate(Camera targetCamera, float z)
	{
		leftTop = targetCamera.ViewportToWorldPoint(new Vector3(1, 0, z));
		rightDown = targetCamera.ViewportToWorldPoint(new Vector3(0, 1, z));
		rightTop = targetCamera.ViewportToWorldPoint(new Vector3(0, 0, z));
		leftDown = targetCamera.ViewportToWorldPoint(new Vector3(1, 1, z));
	}

	void OnDrawGizmos()
	{
		Camera targetCamera = camera;
		depth = -targetCamera.transform.localPosition.z;

		Vector3 forwardPosition =  targetCamera.transform.forward * depth;
		PositionUpdate(targetCamera, forwardPosition.z);

		Vector3 cameraPosition = targetCamera.transform.position;

		Gizmos.DrawLine(leftTop, rightTop);
		Gizmos.DrawLine(leftTop, leftDown);
		Gizmos.DrawLine(rightDown, leftDown);
		Gizmos.DrawLine(rightDown, rightTop);

		Gizmos.color = new Color(1, 1, 1, 0.4f);

		if(! drawSubline )
			return;

		if( !targetCamera.orthographic )
		{
			Gizmos.DrawLine(cameraPosition, (leftTop - cameraPosition) * 10+ cameraPosition); 
			Gizmos.DrawLine(cameraPosition, (leftDown - cameraPosition) * 10+ cameraPosition); 
			Gizmos.DrawLine(cameraPosition, (rightTop - cameraPosition) * 10+ cameraPosition); 
			Gizmos.DrawLine(cameraPosition, (rightDown - cameraPosition) * 10+ cameraPosition); 
		}else{
			Vector3 forward = targetCamera.transform.forward * 10;
			Vector3 back = targetCamera.transform.forward * -10;
			Gizmos.DrawLine(leftTop + forward, leftTop + back); 
			Gizmos.DrawLine(leftDown + forward, leftDown + back); 
			Gizmos.DrawLine(rightTop + forward, rightTop + back); 
			Gizmos.DrawLine(rightDown + forward, rightDown + back); 
		}
	}

	void OnDrawGizmosSelected()
	{
		Camera targetCamera = camera;
		depth = -targetCamera.transform.localPosition.z;

		Vector3 leftcenter = targetCamera.ViewportToWorldPoint(new Vector3(1, 0.5f, forwardPosition.z));
		Vector3 centerTop = targetCamera.ViewportToWorldPoint(new Vector3(0.5f, 0, forwardPosition.z));

		UnityEditor.Handles.Label(leftTop, leftTop.ToString());
		UnityEditor.Handles.Label(rightDown, rightDown.ToString());

		UnityEditor.Handles.Label(leftcenter, Vector3.Distance(leftTop, leftDown).ToString("0.0"));
		UnityEditor.Handles.Label(centerTop, Vector3.Distance(leftTop, rightTop).ToString("0.0"));

	}

	void OnValidate()
	{
		depth = Mathf.Max(0, depth);
	}
#endif
}