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World SpaceをScreenSpaceCameraに変換
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class UIFollowTarget : MonoBehaviour
RectTransform rectTransform = null;
[SerializeField] Transform target = null;
Canvas canvas;
void Awake()
rectTransform = GetComponent<RectTransform> ();
canvas = GetComponent<Graphic> ().canvas;
void Update ()
var pos =;
var uiCamera = Camera.main;
var worldCamera = Camera.main;
var canvasRect = canvas.GetComponent<RectTransform> ();
var screenPos = RectTransformUtility.WorldToScreenPoint (worldCamera, target.position);
RectTransformUtility.ScreenPointToLocalPointInRectangle(canvasRect, screenPos, uiCamera, out pos);
rectTransform.localPosition = pos;
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