vuforia模型脱卡功能的实现

本文主要是介绍vuforia模型脱卡功能的实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

这是转载，转载，转载，附原地址：

http://www.manew.com/thread-92769-1-1.html

实现思路是这样：

识别图视野脱离之后，将被识别的物体不再作为识别图的子物体，转而作为相机的子物体，并置于屏幕中央位置。

1.首先，

写个小script：

[C#] 纯文本查看复制代码

 ? 
 using  UnityEngine; 
 using  Vuforia; 
 public  class  pageNotFound404 : MonoBehaviour,ITrackableEventHandler 
 { 
          private  TrackableBehaviour mTrackableBehaviour; 
          public  Transform Target; //识别物 
          Vector3 imgPos= new  Vector3 (0,0.372f,0); //识别图上的位置 
          Vector3 camPos= new  Vector3 (0,0,500); //脱卡后在屏幕中的位置 
          //这俩值，具体多少得自己调，模型尺寸、重心不同 
          bool  isFirstTime= true ; 
          void  Start() 
          { 
                  mTrackableBehaviour = GetComponent<TrackableBehaviour>(); 
                  if  (mTrackableBehaviour) 
                  { 
                          mTrackableBehaviour.RegisterTrackableEventHandler( this ); 
                  } 
                  Target .GetComponent<MeshRenderer>().enabled= false ; //起始时不显示 
          } 
          public  void  OnTrackableStateChanged( 
                  TrackableBehaviour.Status previousStatus, 
                  TrackableBehaviour.Status newStatus) 
          { 
                  if  (newStatus == TrackableBehaviour.Status.DETECTED || 
                          newStatus == TrackableBehaviour.Status.TRACKED || 
                          newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED) 
                  { 
                          //视野内发现识别图时 
                          Target .GetComponent<MeshRenderer>().enabled= true ; 
                          Target.parent = this .transform ; 
                          Target.localPosition = imgPos; 
                          Target.localRotation = Quaternion.identity; 
                          isFirstTime =  false ; 
                  } 
                  else 
                  { 
                          //视野内没有识别图时，这里我是把位置和旋转都归零了，如果不做处理，可以 
                          if (!isFirstTime){ 
                          Target.parent=Camera.main .transform; 
                          Target.localPosition= camPos; 
                          Target.localRotation = Quaternion.identity; 
                          } 
                  } 
          } 
 } 
          