UIAttachTo3DObjectSimple.cs

gistfile1.txt

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(RectTransform))]

/// <summary>
/// 3DオブジェクトにUI張り付かせるやつ、ScreenSpace-Overay用
/// </summary>
public class UIAttachTo3DObject : MonoBehaviour
{
    [SerializeField]
    private Transform targetTransform;
    [SerializeField]
    private Camera targetCamera;
    [SerializeField]
    private RectTransform selfRectTrans;
    private bool inited;

    public void Init(Transform target, Camera targetCam, Camera uiCam, RectTransform canvasRect)
    {
        targetTransform = target;
        targetCamera = targetCam;
        selfRectTrans = GetComponent<RectTransform>();
        inited = true;
    }

    void Update()
    {
        if(inited)
        {
            AttachPosition();
        }
    }

    private void AttachPosition()
    {
        Vector3 screenPos = targetCamera.WorldToScreenPoint(targetTransform.position);
        this.rectTransform.position = screenPos;
    }
}