今天學習一下如何實現UGUI 2dUI跟隨3d物體移動的效果
建立cube，建立Image。image作為血條，跟隨cube移動
在cube上面新增指令碼

using UnityEngine;
using System.Collections;

public class FlowTest : MonoBehaviour {

    public RectTransform rectBloodPos;
    public int offstex;
    public int offsety;
    // Update is called once per frame
    void
 
 Update () {


        //get ScreenPoint...Important
        Vector2 vec2 = Camera.main.WorldToScreenPoint (this.gameObject.transform.position);

        rectBloodPos.anchoredPosition = new Vector2 (vec2.x-Screen.width/2+0, vec2.y-Screen.height/2+60);//控制偏移量
        //rectBloodPos.anchoredPosition = vec2 + new Vector2(offstex,offsety);
 

    }
}

執行效果：

3d物體跟隨移動的另一種實現方式：

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

public class MoveFlow : MonoBehaviour
{
    public Transform gob3d;//3d物體
    public RectTransform image;//2dUI
    public Canvas cav;//sdUI 所在的canvas
    // Use this for initialization
 

    void Start ()
    {

    }

    // Update is called once per frame
    void Update ()
    {
        Vector2 screenPos = Camera.main.WorldToScreenPoint (gob3d.position);
        Vector3 globalMousePos;
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle (image, screenPos, cav.worldCamera, out globalMousePos)) {
            image.position = globalMousePos;
        }

    }
}