アタッチしたオブジェクトの位置を、対象のカメラの左上・右下等に移動させる。上手く使うと子オブジェクトのx:0,y:0の座標を左上や右下に出来る

AncherLite.cs

using UnityEngine;
using System.Collections;

public class AncherLite : MonoBehaviour {

	public Camera target;

	public enum VIRTUCAL
	{
		TOP = 10,
		CENTER = 5,
		BOTTOM = 0
	};
	public enum HOLIZONAL
	{
		LEFT = 0,
		CENTER = 5,
		RIGHT = 10
	};

	public VIRTUCAL v;
	public HOLIZONAL h;

	void OnValidate()
	{
		if( target == null)
			target = Camera.main;

		var z = transform.position.z;
		var worldPoint = target.ViewportToWorldPoint(new Vector3(0.1f *  (int)h, 0.1f * (int)v, z));
		worldPoint.z = z;
		transform.position = worldPoint;
	}
}