Hi,
Am using Unity and Vuforia for creating non-game Android application. I have small doubt. Whether we can change the detect behavior of the image target (Augmented Reality)?. For example: When we target out picture , instead of opening the animation, I want to open my new scene. if there is a way for this, please help me with this. Thank you in advance.
Hi,
You need to define Your own Handler script which inherited from ITrackableEventHandler. I have example with cloud reco (which inherited form ICloudRecoEventHandler not ITrackableEventHandler) . In case of cloud reco script is attached to CloudRecognition prefab, but in your case it should be ARCamera I think. ImageTargetTemplate is our imageTarget from vuforia database.
using UnityEngine;
using System.Collections;
using Vuforia;
using UnityEngine.SceneManagement;
public class SimpleCloudHandler : MonoBehaviour, ICloudRecoEventHandler {
public ImageTargetBehaviour ImageTargetTemplate;
private CloudRecoBehaviour mCloudRecoBehaviour;
private bool mIsScanning = false;
private string mTargetMetadata = "";
// Use this for initialization
void Start () {
// register this event handler at the cloud reco behaviour
mCloudRecoBehaviour = GetComponent<CloudRecoBehaviour>();
if (mCloudRecoBehaviour)
{
mCloudRecoBehaviour.RegisterEventHandler(this);
}
}
public void OnInitialized(){
Debug.Log ("cloud reco init");
}
public void OnInitError(TargetFinder.InitState initError){
Debug.Log ("Cloud reco init error " + initError.ToString ());
}
public void OnUpdateError(TargetFinder.UpdateState updateError){
Debug.Log ("cloud reco update error " + updateError.ToString ());
}
public void OnStateChanged(bool scanning){
mIsScanning = scanning;
if (scanning) {
TrackerManager.Instance.GetTracker<ObjectTracker> ().TargetFinder.ClearTrackables (false);
}
}
public void OnNewSearchResult(TargetFinder.TargetSearchResult tsr){
mTargetMetadata = tsr.MetaData;
mCloudRecoBehaviour.CloudRecoEnabled = false;
if(ImageTargetTemplate){
ObjectTracker tracker = TrackerManager.Instance.GetTracker<ObjectTracker> ();
**SceneManager.LoadScene ("cloud_test2");**
}
}
void OnGui(){
GUI.Box (new Rect (100, 100, 200, 50), mIsScanning ? "Scanning" : "Not Scanning");
GUI.Box (new Rect (100, 200, 200, 50), "Metadata: " + mTargetMetadata);
if (!mIsScanning) {
if (GUI.Button (new Rect (100, 300, 200, 50), "Restart Scanning")) {
mCloudRecoBehaviour.CloudRecoEnabled = true;
}
}
}
}
Thank you for your reply. Am beginner with unity and vuforia. Can you give me example script regarding ITrackableEventHandler ?
Make custom class inherited from MonoBehaviour, ITrackableEventHandler (you can copy DefaultTrackableEventHandler ). Put custom behaviour. Use CustomTrackableEventHandler instead DefaultTrackableEventHandler.
Here is the sample:
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Vuforia;
public class CustomTrackableEventHandler : MonoBehaviour, ITrackableEventHandler
{
#region PROTECTED_MEMBER_VARIABLES
protected TrackableBehaviour mTrackableBehaviour;
protected TrackableBehaviour.Status m_PreviousStatus;
protected TrackableBehaviour.Status m_NewStatus;
#endregion // PROTECTED_MEMBER_VARIABLES
#region UNITY_MONOBEHAVIOUR_METHODS
protected virtual void Start()
{
mTrackableBehaviour = GetComponent<TrackableBehaviour>();
if (mTrackableBehaviour)
mTrackableBehaviour.RegisterTrackableEventHandler(this);
}
protected virtual void OnDestroy()
{
if (mTrackableBehaviour)
mTrackableBehaviour.UnregisterTrackableEventHandler(this);
}
#endregion // UNITY_MONOBEHAVIOUR_METHODS
#region PUBLIC_METHODS
/// <summary>
/// Implementation of the ITrackableEventHandler function called when the
/// tracking state changes.
/// </summary>
public void OnTrackableStateChanged(
TrackableBehaviour.Status previousStatus,
TrackableBehaviour.Status newStatus)
{
m_PreviousStatus = previousStatus;
m_NewStatus = newStatus;
if (newStatus == TrackableBehaviour.Status.DETECTED ||
newStatus == TrackableBehaviour.Status.TRACKED ||
newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)
{
Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
// Custom code here ...
AppManager.Instance.FoundTrackable(mTrackableBehaviour.TrackableName);
OnTrackingFound();
}
else if (previousStatus == TrackableBehaviour.Status.TRACKED &&
newStatus == TrackableBehaviour.Status.NO_POSE)
{
Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
// Custom code here...
AppManager.Instance.LostTrackable();
OnTrackingLost();
}
else
{
// For combo of previousStatus=UNKNOWN + newStatus=UNKNOWN|NOT_FOUND
// Vuforia is starting, but tracking has not been lost or found yet
// Call OnTrackingLost() to hide the augmentations
OnTrackingLost();
}
}
#endregion // PUBLIC_METHODS
#region PROTECTED_METHODS
protected virtual void OnTrackingFound()
{
var rendererComponents = GetComponentsInChildren<Renderer>(true);
var colliderComponents = GetComponentsInChildren<Collider>(true);
var canvasComponents = GetComponentsInChildren<Canvas>(true);
// Enable rendering:
foreach (var component in rendererComponents)
component.enabled = true;
// Enable colliders:
foreach (var component in colliderComponents)
component.enabled = true;
// Enable canvas':
foreach (var component in canvasComponents)
component.enabled = true;
}
protected virtual void OnTrackingLost()
{
var rendererComponents = GetComponentsInChildren<Renderer>(true);
var colliderComponents = GetComponentsInChildren<Collider>(true);
var canvasComponents = GetComponentsInChildren<Canvas>(true);
// Disable rendering:
foreach (var component in rendererComponents)
component.enabled = false;
// Disable colliders:
foreach (var component in colliderComponents)
component.enabled = false;
// Disable canvas':
foreach (var component in canvasComponents)
component.enabled = false;
}
#endregion // PROTECTED_METHODS
}