unity实现UI元素跟随3D物体
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:

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