回答編集履歴
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Camera.main削減版
test
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参考:[【Unity】スクリプトからMain Cameraを取得するのは簡単だよ](https://tech.pjin.jp/blog/2018/01/31/unity_get-main-camera/)
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#追記
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リファレンスによると`Camera.main`は一見ただの変数のように見えますが、内部的に[FindGameObjectsWithTag](https://docs.unity3d.com/ja/current/ScriptReference/GameObject.FindGameObjectsWithTag.html)を使っているプロパティだそうです。
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Unityでのセオリーとして、[Update](https://docs.unity3d.com/ja/current/ScriptReference/MonoBehaviour.Update.html)や、今回使っている[OnMouseDrag](https://docs.unity3d.com/ja/current/ScriptReference/MonoBehaviour.OnMouseDrag.html)のような高頻度で実行されるメソッド中でFind系メソッドを乱発するな...とよく言われますが、それに従うと下記のように[OnMouseDown](https://docs.unity3d.com/ja/current/ScriptReference/MonoBehaviour.OnMouseDown.html)で（あるいは[Awake](https://docs.unity3d.com/ja/current/ScriptReference/MonoBehaviour.Awake.html)、[Start](https://docs.unity3d.com/ja/current/ScriptReference/MonoBehaviour.Start.html)などで）一度だけ取得する方が望ましいかもしれません。
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```C#
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private Vector3 screenPoint;
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private Vector3 offset;
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private Camera mainCamera;
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void OnMouseDown()
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{
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mainCamera = Camera.main;
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screenPoint = mainCamera.WorldToScreenPoint(transform.position);
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float x = Input.mousePosition.x;
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float y = Input.mousePosition.y;
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offset = transform.position - mainCamera.ScreenToWorldPoint(new Vector3(x, y, screenPoint.z));
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}
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void OnMouseDrag()
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{
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float x = Input.mousePosition.x;
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float y = Input.mousePosition.y;
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Debug.Log(x.ToString() + " - " + y.ToString());
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Vector3 currentScreenPoint = new Vector3(x, y, screenPoint.z);
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Vector3 currentPosition = mainCamera.ScreenToWorldPoint(currentScreenPoint) + offset;
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transform.position = currentPosition;
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}
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```
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参考:[Unite Europe 2017 - Squeezing Unity: Tips for raising performance](https://youtu.be/_wxitgdx-UI?t=546)
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