本文实例为大家分享了unity实现UI元素跟随3D物体的具体代码，供大家参考，具体内容如下

在Canvas不同的渲染模式（RenderMode）下实现UI跟随3D物体

当Canvas.RenderMode为Screen Space-Overlay时

利用WorldToScreenPoint(worldPos)将物体的世界坐标转换成屏幕坐标,实时更新UI的坐标：

using UnityEngine;using System.Collections;public class FollowWorldObj : MonoBehaviour { [SerializeField] GameObject worldPos;//3D物体（人物） [SerializeField] RectTransform rectTrans;//UI元素（如：血条等） public Vector2 offset;//偏移量 // Update is called once per frame void Update () { Vector2 screenPos=Camera.main.WorldToScreenPoint(worldPos.transform.position); rectTrans.position = screenPos + offset; }}

当Canvas.RenderMode为Screen Space-Camera时

利用RectTransformUtility.ScreenPointToLocalPointInRectangle换算出UI元素在Canvas的2D坐标:

using UnityEngine;using System.Collections;using UnityEngine.EventSystems;public class UI_FollowObj : MonoBehaviour { [SerializeField] Camera UI_Camera;//UI相机 [SerializeField] RectTransform image;//UI元素 [SerializeField] GameObject obj;//3D物体 [SerializeField] Canvas ui_Canvas; // Update is called once per frame void Update () { UpdateNamePosition(); } /// <summary> /// 更新image位置 /// </summary> void UpdateNamePosition() { Vector2 mouseDown = Camera.main.WorldToScreenPoint(obj.transform.position); Vector2 mouseUGUIPos = new Vector2(); bool isRect = RectTransformUtility.ScreenPointToLocalPointInRectangle(ui_Canvas.transform as RectTransform, mouseDown, UI_Camera, out mouseUGUIPos); if (isRect) { image.anchoredPosition = mouseUGUIPos; } }}

效果如下：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。