====== 039 追従するカメラ ======

===== 概要 =====
GameObjectが動くとカメラもそれに従って移動します。

==== ソースコード ====
<code csharp>
using UnityEngine;
using System.Collections;

public class CameraScript : MonoBehaviour
{
	GameObject target;
	
	void Start ()
	{
		target = GameObject.FindGameObjectWithTag("playerTag");
	}
	
	void Update ()
	{
		transform.LookAt( target.transform.position );
		
		Vector3 vecCamera = transform.position - target.transform.position;
		vecCamera = Vector3.Normalize( vecCamera );
		
		float distance = 5.0f;
		Vector3 cameraTargetPosition = target.transform.position + vecCamera * distance;
		
		float damping = 1.0f;
		transform.position = Vector3.Lerp( transform.position, cameraTargetPosition, damping * Time.deltaTime );
	}
}
</code>
カメラのGameObjectに割り当てる。移動量はLerp で補間。

==== Vector3.SmoothDampを使う場合 ====
<code csharp>
Vector3 velocity = Vector3.zero;
transform.position = Vector3.SmoothDamp( transform.position, cameraTargetPosition, ref velocity, damping );
</code>