本教程基于羽安老师的单目标脱卡识别(http://www.arinchina.com/video/show-1950.html)基础上增加多目标实现脱卡的,在使用本教程之前请先看羽安老师的教程。
Action……………………
当图片识别成功后,将当前组件作为模型的父物体,当图片丢失后,在Camera中新建一个空物体(empty),并将模型作为该空物体的子物体
替换Default Trackable Event Handler脚本:
///NotFound.cs
using UnityEngine;
using System.Collections;
using Vuforia;
using System;
using UnityEngine.SceneManagement;
public class NotFound : MonoBehaviour , ITrackableEventHandler
{
#region PRIVATE_MEMBER_VARIABLES
private TrackableBehaviour mTrackableBehaviour;
//判断是否是第一次识别是否完成,防止开启程序未放入识别图也在屏幕中央出现模型
bool firstfound = false;
public GameObject successImage;
public bool imageIsOut = false;//识别成功的图片是否已经出现过
//模型起始位置,值为起始模型组件中Transform.Position
//Vector3 origposition = new Vector3 (0, 0.25f, 0);
public Vector3 originPosition;
//当前imagetarget对应的模型等target
public Transform[] localTargets;
//其他非当前imagetarget对应的模型等targets
public Transform[] otherTargets;
//Camera Object
GameObject gObject;
//Camera Object的Creat Empty脚本
CreatEmpty cempty;
//表示ImageTarget父物体那个组件
public GameObject[] otherImageTargets;
#region 自定义的协程延时函数
//定义一个延时函数
public static IEnumerator DelayToInvokeDo(Action action, float delaySeconds)
{
yield return new WaitForSeconds(delaySeconds);
action();
}
#endregion //自定义的协程延时函数
void Start()
{
//不显示两张识别成功失败的图片
successImage.SetActive (false);
//相机自动对焦
Vuforia.CameraDevice.Instance.SetFocusMode(Vuforia.CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO);
mTrackableBehaviour = GetComponent();
if (mTrackableBehaviour)
{
mTrackableBehaviour.RegisterTrackableEventHandler(this);
}
//获取Camera中组件的CreatEmpty脚本
gObject = GameObject.FindWithTag("MainCamera");
cempty = gObject.GetComponent ();
if(cempty != null)
{
//杀死空物体
cempty.destoryempty ();
}
}
void Update()
{
//退出当前程序
if(Input.GetKeyDown(KeyCode.Escape))
{
//Application.Quit();
//Application.LoadLevel("PreschoolEducation-0-MenuScreen");
SceneManager.LoadScene ("PreschoolEducation-0-MenuScreen");
}
}
#endregion // UNTIY_MONOBEHAVIOUR_METHODS
#region PUBLIC_METHODS
///
/// Implementation of the ITrackableEventHandler function called when the
/// tracking state changes.
///
public void OnTrackableStateChanged(
TrackableBehaviour.Status previousStatus,
TrackableBehaviour.Status newStatus)
{
//Vector3 orirotation = new Vector3 (270, 0, 0);
if (newStatus == TrackableBehaviour.Status.DETECTED ||
newStatus == TrackableBehaviour.Status.TRACKED ||
newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
{
//如果识别成功图片没有出现过,则执行下面的代码,显示并延时0.5秒后消失
if(!imageIsOut)
{
successImage.SetActive (true);
for(int i = 0; i < otherTargets.Length; i++)
{
//但是隐藏其他imagetarget对应的模型,目的是防止在该imagetarget对应的模型出现在屏幕中央的时候不受其他imagetarget对应的模型的影响
//otherTargets[i].gameObject.SetActive (false);
setShow (otherTargets [i], false);
}
for(int i = 0; i < localTargets.Length; i++)
{
//localTargets[i].gameObject.SetActive (false);
setShow (localTargets [i], false);
}
//需要延时0.3s,让图片多显示0.3s后消失(执行outImage函数)
//Invoke ("outImage", 0.5f);//如果这样,并不影响下面代码的执行。
StartCoroutine(DelayToInvokeDo(() =>
{
outImage(newStatus);
//识别成功图片已经显示过了
imageIsOut = true;
}, 0.4f));
}
else
{
OnTrackingFound ();
}
}
else
{
OnTrackingLost ();
}
}
#endregion // PUBLIC_METHODS
//识别成功图片显示并消失之后
private void outImage(TrackableBehaviour.Status newStatus)
{
successImage.SetActive (false);
for(int i = 0; i < otherTargets.Length; i++)
{
//但是隐藏其他imagetarget对应的模型,目的是防止在该imagetarget对应的模型出现在屏幕中央的时候不受其他imagetarget对应的模型的影响
//otherTargets[i].gameObject.SetActive (false);
setShow (otherTargets [i], false);
}
for(int i = 0; i < localTargets.Length; i++)
{
//localTargets[i].gameObject.SetActive (false);
setShow (localTargets [i], false);
}
//显示并消失之后在一次判断图片是否处于追踪状态
if (newStatus == TrackableBehaviour.Status.TRACKED ||
newStatus == TrackableBehaviour.Status.DETECTED ||
newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
{
OnTrackingFound ();
firstfound = true;
}
else
{
//OnTrackingLost ();
for(int i = 0; i < otherTargets.Length; i++)
{
//但是隐藏其他imagetarget对应的模型,目的是防止在该imagetarget对应的模型出现在屏幕中央的时候不受其他imagetarget对应的模型的影响
//otherTargets[i].gameObject.SetActive (false);
setShow (otherTargets [i], false);
}
for(int i = 0; i < localTargets.Length; i++)
{
//localTargets[i].gameObject.SetActive (false);
setShow (localTargets [i], false);
}
}
}
private void OnTrackingFound()
{
Debug.Log ("it is found");
for(int i = 0; i < otherImageTargets.Length; i++)
{
//让其他的识别图在执行一次状态识别成功的代码,使得模型归位到imagetarget子物体
otherImageTargets[i].GetComponent ().homing ();
//当前图片识别成功时,关闭其他图片的识别
// otherImageTargets[i].SetActive (false);
//将其他识别图中的识别成功图片设置成未显示过
otherImageTargets [i].GetComponent ().imageIsOut = false;
}
for(int i = 0; i < localTargets.Length; i++)
{
//setShow (localTargets [i], true);
//othertargetmodel.gameObject.SetActive (false);
localTargets[i].parent = this.transform;
localTargets[i].localPosition = originPosition;
localTargets[i].rotation = Quaternion.Euler (Vector3.zero);
//开启当前图片对应的模型,因为在识别其他图片的时候有可能关闭了这个图片对应的模型
//localTargets[i].gameObject.SetActive (true);
setShow (localTargets [i], true);
}
//杀死空物体
cempty.destoryempty ();
//因为杀死了空物体,所以一旦丢失跟踪,模型就没地方放了,所以就加一个判断,丢失的话就不显示模型
if(mTrackableBehaviour.CurrentStatus ==TrackableBehaviour.Status.NOT_FOUND)
{
for(int i = 0;i < localTargets.Length; i++)
{
setShow (localTargets [i], false);
}
}
//target.rotation = Quaternion.Euler(orirotation);
//firstfound = true;
}
private void OnTrackingLost()
{
Debug.Log ("it is lost");
for(int i = 0; i < localTargets.Length; i++)
{
//localTargets[i].gameObject.SetActive (false);
setShow (localTargets [i], false);
}
successImage.SetActive (false);
if (firstfound == true)
{
//创建空物体
cempty.creatempty ();
for(int i = 0; i < otherTargets.Length; i++)
{
//但是隐藏其他imagetarget对应的模型,目的是防止在该imagetarget对应的模型出现在屏幕中央的时候不受其他imagetarget对应的模型的影响
//otherTargets[i].gameObject.SetActive (false);
setShow (otherTargets [i], false);
}
GameObject emptyobject = GameObject.Find ("empty");
Transform cameraPos = emptyobject.transform;
for(int i = 0; i < localTargets.Length; i++)
{
//将target作为cameraPos的子物体,cameraPos就是emptyobject(即空物体)的Transform表现形式
localTargets[i].parent = cameraPos;
localTargets[i].localPosition = originPosition;
//target.localRotation = Quaternion.Euler (orirotation);
localTargets[i].localRotation = Quaternion.Euler (Vector3.zero);
//localTargets[i].gameObject.SetActive (true);
setShow (localTargets [i], true);
}
}
else
{
for(int i = 0; i < otherTargets.Length; i++)
{
//但是隐藏其他imagetarget对应的模型,目的是防止在该imagetarget对应的模型出现在屏幕中央的时候不受其他imagetarget对应的模型的影响
//otherTargets[i].gameObject.SetActive (false);
setShow (otherTargets [i], false);
}
for(int i = 0; i < localTargets.Length; i++)
{
print ("local Targets set active false");
//localTargets[i].gameObject.SetActive (false);
setShow (localTargets [i], false);
}
}
}
//方便其他脚本调用的接口函数,使this.中模型归位
public void homing()
{
for(int i = 0; i < localTargets.Length; i++)
{
localTargets[i].parent = this.transform;
localTargets[i].position = originPosition;
localTargets[i].rotation = Quaternion.Euler (Vector3.zero);
}
}
//自己写的隐藏模型代码,仅模型可用
void setShow(Transform target,bool IsShow)
{
Renderer[] targetrendererComponents = target.GetComponentsInChildren(true);
Collider[] targetcolliderComponents = target.GetComponentsInChildren(true);
if(IsShow)
{
// enable rendering:
foreach (Renderer component in targetrendererComponents)
{
component.enabled = true;
}
// enable colliders:
foreach (Collider component in targetcolliderComponents)
{
component.enabled = true;
}
}
else
{
// Disable rendering:
foreach (Renderer component in targetrendererComponents)
{
component.enabled = false;
}
// Disable colliders:
foreach (Collider component in targetcolliderComponents)
{
component.enabled = false;
}
}
}
}
在Camera中创建空物体empty:
///CreatEmpty.cs
using UnityEngine;
using System.Collections;
using Vuforia;
public class CreatEmpty : MonoBehaviour {
Vector3 emptyposition = new Vector3 (0, 0, 567);
public void creatempty()
{
//定义一个空物体,并将他作为Camera的子物体,并设置其坐标和旋转角度
GameObject emptyObject = new GameObject ();
emptyObject.transform.parent = GameObject.FindWithTag ("MainCamera").transform;
emptyObject.name = "empty";
emptyObject.transform.localPosition = emptyposition;
emptyObject.transform.localRotation = Quaternion.Euler (Vector3.zero);
}
//杀死camera组件中名字为“empty”的物体
public void destoryempty()
{
if (GameObject.Find ("empty"))
GameObject.Destroy (GameObject.Find ("empty"));
else
print ("没有empty!");
}
}
将NotFound.cs赋到ImageTarget中替换Default Trackable Event Handler脚本,CreatEmpty.cs赋到Camera中。
2016年10月29日更新博客,修复了NotFound脚本中,绑定在模型上的脚本自动隐藏的问题,同时修复了,出现识别成功图片过程中(还未出现模型),迅速让图片目标丢失,模型仍然显示,而且位置乱了的问题。