高通AR 的cloud研究

lehedele 2014-04-09 11:30:15

原文地址：https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/please-explain-step-step-how-use-vuforia-cloud
首先，你需要注册free Cloud Recognition developer账号，然后在Targe Manager创建一个Cloud DataBase
https://developer.vuforia.com/targetmanager

完成后，将会给你Access Keys，在你的AR程序中用那个Client Access Keys去请求数据库，
Server Access keys用来准备和管理你的云端targets的。

你可以往Cloud DataBase添加targets,使用Target Manager--选择Add Target 并且上传图片和相应的数据文件到数据库。

当你创建完成Cloud DataBase 并且targets设置完成，你就可以将Client Access keys填入到CloudRecoBehaviour这个组建的参数里了。

你可以从Qualcomm Augmented Reality/Prefabs folder中找到CloudRecognition 这个prefab，把他拽到hierarchy面板。

然后，加入一个CloudRecoEventHandler.cs到CloudRecognition这个物体上（下面会介绍）。这将能让你捕获图片扫描结果，结果将以TargetFinder.TargetSearchResult的结构返回给你。
public struct TargetSearchResult
{
// name of the target
public string TargetName;
// system-wide unique id of the target.
public string UniqueTargetId;
/// width of the target (in 3D scene units)
public float TargetSize;
// metadata associated with this target
public string MetaData;
//tracking rating for this target
/**
* The tracking rating represents a 5-star rating describing the
* suitability of this target for tracking on a scale from 0 to 5. A low
* tracking rating may result in poor tracking or unstable augmentation.
*/
public byte TrackingRating;
// pointer to native search result
public IntPtr TargetSearchResultPtr;

}
要显示返回的target，你需要用一个Image Target Template,它其实就是一个ImageTarget实例，在你的场景中你将他当成虚拟物体模板。你需要做的是把这个ImageTargets拖到CloudRecoEventHandler组件上的Image Target Template field这个参数上。

另外，你要做自己的设计的话，也可以用下面这个精简版的SimpleCloudRecoEventHandler.cs. 你需要获得的数据可以在OnNewSearchResult（）方法中调用。
using System;
using UnityEngine;

/// <summary>
/// This MonoBehaviour implements the Cloud Reco Event handling for this sample.
/// It registers itself at the CloudRecoBehaviour and is notified of new search results.
/// </summary>
public class SimpleCloudRecoEventHandler : MonoBehaviour, ICloudRecoEventHandler
{
#region PRIVATE_MEMBER_VARIABLES

// CloudRecoBehaviour reference to avoid lookups
private CloudRecoBehaviour mCloudRecoBehaviour;
// ImageTracker reference to avoid lookups
private ImageTracker mImageTracker;

#endregion // PRIVATE_MEMBER_VARIABLES

#region EXPOSED_PUBLIC_VARIABLES

/// <summary>
/// can be set in the Unity inspector to reference a ImageTargetBehaviour that is used for augmentations of new cloud reco results.
/// </summary>
public ImageTargetBehaviour ImageTargetTemplate;

#endregion

#region ICloudRecoEventHandler_IMPLEMENTATION

/// <summary>
/// called when TargetFinder has been initialized successfully
/// </summary>
public void OnInitialized()
{
// get a reference to the Image Tracker, remember it
mImageTracker = (ImageTracker)TrackerManager.Instance.GetTracker(Tracker.Type.IMAGE_TRACKER);
}

/// <summary>
/// initialization errors
/// </summary>
public void OnInitError(TargetFinder.InitState initError)
{
}

/// <summary>
/// update errors
/// </summary>
public void OnUpdateError(TargetFinder.UpdateState updateError)
{
}

/// <summary>
/// updates to the scanning state
/// </summary>
public void OnStateChanged(bool scanning)
{
}

/// <summary>
/// Handles new search results
/// </summary>
/// <param name="targetSearchResult"></param>
public void OnNewSearchResult(TargetFinder.TargetSearchResult targetSearchResult)
{
// duplicate the referenced image target
GameObject newImageTarget = Instantiate(ImageTargetTemplate.gameObject) as GameObject;

// enable the new result with the same ImageTargetBehaviour:
ImageTargetBehaviour imageTargetBehaviour = mImageTracker.TargetFinder.EnableTracking(targetSearchResult, newImageTarget);

if (imageTargetBehaviour != null)
{
// stop the target finder
mCloudRecoBehaviour.CloudRecoEnabled = false;
}
}

#endregion // ICloudRecoEventHandler_IMPLEMENTATION

#region UNTIY_MONOBEHAVIOUR_METHODS

/// <summary>
/// register for events at the CloudRecoBehaviour
/// </summary>
void Start()
{
// register this event handler at the cloud reco behaviour
CloudRecoBehaviour cloudRecoBehaviour = GetComponent<CloudRecoBehaviour>();
if (cloudRecoBehaviour)
{
cloudRecoBehaviour.RegisterEventHandler(this);
}

// remember cloudRecoBehaviour for later
mCloudRecoBehaviour = cloudRecoBehaviour;
}

#endregion // UNTIY_MONOBEHAVIOUR_METHODS

}
这个程序将会自动调用扫描功能，你可以控制扫描状态，通过设置
CloudRecoBehaviour.CloudRecoEnabled = true || false

你不需要用ContentManager物体。那是例子中用来从服务器返回JSON数据用的。

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