思路是这样：
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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;
}
}
}
}
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