I am trying to store the Vuforia User Image targets locally so users will not have to create the targets every time they leave the scene.
I tried to store the variables to create the new image target in a static class so i can retrieve them when i am back to the scene. and create the image targets then add them to the dataset.
//****************************************************************************************************
//Trying to load image target between scenes
//****************************************************************************************************
//Deactivate the dataset in order to add the image target
m_ObjectTracker.DeactivateDataSet(m_UDT_DataSet);
var LastImageTrackable = ImageTargetStorage.newTrackable;
if(LastImageTrackable != null)
{
//Find UDT behavior and Gameobject
ImageTargetBehaviour imageTargetCopy = Instantiate(ImageTargetTemplate);
System.Random rnd = new System.Random();
int RandomNum = rnd.Next(1, 1000);
imageTargetCopy.gameObject.name = "UserDefinedTarget-" + RandomNum;
// Add the target to the dataset
try{
m_UDT_DataSet.CreateTrackable(LastImageTrackable, imageTargetCopy.gameObject);
}
catch(Exception ex)
{
Debug.Log("An Error has occured while trying to create image target from different scene.");
}
// Activate the dataset again
m_ObjectTracker.ActivateDataSet(m_UDT_DataSet);
}
//****************************************************************************************************
Unity Crashes and never give me any useful data on the issue.
the step that causes the crash is
m_UDT_DataSet.CreateTrackable(LastImageTrackable, imageTargetCopy.gameObject);
which gets the LastImageTrackable from previous creation.
Please advise me on this error and kindly suggest a different framework if Vuforia is not suitable for this simple task.
Related
This is quite vexing.
I am working on an app for image management. Part of the value is the ability to store images in sub-folders based on image properties, eg. creation date.
If I store the image source in a shallow folder (app\images\img.jpg), everything works fine.
If I store the image in KnownFolders.Pictures\source\year\month\day\img.jpg, Image does not render. (Yes, that specific path won't work, I am trying to give you a sense of how the path is constructed)...
The file is actually there. The path is correct (I can open it in a browser, e.g.). The app has access to the file.
But it does not render the bitmap.
I tried to render the bitmap manually using
new BitmapImage(new Uri("KnownFolders.Pictures\source\year\month\day\img.jpg"),UriKind.Absolute))
That does not render anything. (Again, assume the path is valid and has a file at its bottom).
What Am I Missing?
The head scratcher: for GIF anims, I am using Thomas Levesque's useful component: https://github.com/XamlAnimatedGif. That one, unfortunately, does only render gifs... and it does so even when the path is the one given above. So the Standard IMAGE control does not render correctly, but Thomas's control does... infuriating.
An UWP app can't load a BitmapImage from an absolute URL to a file in a folder structure below the Pictures Library Folder.
So this won't work:
var relativePath = #"source\year\month\day\img.jpg";
var imageFile = await KnownFolders.PicturesLibrary.GetFileAsync(relativePath);
var bitmapImage = new BitmapImage(new Uri(imageFile.Path));
However, you could do this:
var relativePath= #"source\year\month\day\img.jpg";
var imageFile = await KnownFolders.PicturesLibrary.GetFileAsync(relativePath);
var bitmapImage = new BitmapImage();
using (var stream = await imageFile.OpenAsync(FileAccessMode.Read))
{
await bitmapImage.SetSourceAsync(stream);
}
So, after way too much time spent on this...
First, link to DataContextChanged of the IMAGE element. In there, parse the DataContext out. If you are using the IMAGE outside of an ItemsControl etc, this is not required...
private async void ImageView_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
{
if (sender is Image)
{
Image img = (Image)sender;
if (img.DataContext is ImageView)
{
MyViewDataContext dc = (MyViewDataContext)img.DataContext;
img.Source = await dc.bitmap();
}
}
}
And here the implementation of MyViewDataContext.bitmap() which has a property called source that yields, you guessed it, absolute paths:
public async Task<BitmapImage> MyViewDataContext.bitmap()
{
if (_bitmap == null)
{
try
{
StorageFile file = await StorageFile.GetFileFromPathAsync(source);
bool r = Windows.Storage.AccessCache.StorageApplicationPermissions.FutureAccessList.CheckAccess(file);
if (r)
{
using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
// create a new bitmap, coz the old one must be done for...
_bitmap = new BitmapImage();
// And get that bitmap sucked in from stream.
await _bitmap.SetSourceAsync(fileStream);
}
}
}
catch (Exception e)
{
_bitmap = null;
}
}
return _bitmap;
}
BitmapImage _bitmap;
I cache the resulting bitmap until I dispose of this MyViewDataContext.
I am now most concerned about memory. This one worries me:
How to dispose BitmapImage cache?
So, as a tech debt, I am going to address the potential mem leaks later, once this whole thing is on the test bench and I can take a look at its runtime behavior...
To access the folders and libraries represented by the properties of this class, specify the corresponding capabilities in your app manifest. For example, to access KnownFolders.PicturesLibrary, specify the Pictures Library capability in the app manifest.
Hope this will help
KnowFolders
I am loading image from script to texture from URL. It is loading successfully, but the image is not reflecting on the texture.
How can I fix this?
you should UV unwrapped your model(that you want to put your image on it as a texture) you save the uv and then import it to unity then you can apply texture to it , here is tutorial that will show you how to do it in blender
Alright, if I'm gathering from the image correctly, it looks like you're using NGUI. If so, then you don't use Mesh Renderer. It's been a little bit since I used NGUI, but you need a reference to the game object or to the UITexture component that is on the game object. So I'll provide some code samples below for both scenarios. But you don't use a mesh renderer unless you're wrapping the texture around a 3D model. If this is for the UITexture then you would attach the image on there.
Game Object Reference:
imageObject.GetComponent<UITexture>().mainTexture = textureToUse;
UITexture Reference:
uiTextureReference.mainTexture = textureToUse;
I think that is what you were looking for, otherwise you need to do unwrapping and what not.
It is very easy if you are using NGUI.
Create a UITexture.
Refer it in you class either by declaring it public variable of getting it at runtime.
Import MiniJSON class that is easily available on internet. (Do not hesitate if you failed to find MiniJSON.Json, it could be MiniJSON.Deserialize or only Json.Deseiralize)
Following is the code snippet to get Facebook Display Picture with User_API_ID
string myImageUrl = "https://graph.facebook.com/"+API_ID+"/picture?type=large&redirect=0";
WWW myImageGraphRequest = new WWW(myImageUrl);
yield return myImageGraphRequest;
if (!string.IsNullOrEmpty(myImageGraphRequest.error))
Debug.Log("Could not fetch own User Image due to: " + myImageGraphRequest.error);
else
{
var myImageData = MiniJSON.Json.Deserialize (myImageGraphRequest.text) as Dictionary<string, object>;
var myImageLinkWithData = myImageData["data"] as Dictionary<string, object>;
string myImageLink = (string)myImageLinkWithData["url"];
WWW myImageRequest = new WWW(myImageLink);
yield return myImageRequest;
if (!string.IsNullOrEmpty(myImageRequest.error))
Debug.Log("Could not get user facebook image: " + myImageRequest.error);
else
{
userDP.mainTexture = myImageRequest.texture;
}
}
userDP is your UITexture.
In my Windows Phone app's main page, users can click a button to do some stuff and that will trigger the live tile to update.
The problem I am having is, if the user clicks the button and then hit the phone's Back button really quickly, the live tile sometimes will not render properly. This issue rarely happens, but it does happen and when it happens it just looks bad...
The way I implement the live tile is, create a user control that looks exactly the same as the live tile and then save it to isolated storage. Then retrieve it and store it in a FliptileData object. Finally I call the Update method on the ShellTile. Please see the following piece of code to demonstrate the process.
// the function that saves the user control to isolated storage
public Uri SaveJpegToIsolatedStorage(FrameworkElement tile, string suffix, int tileWidth = 336, int tileHeight = 336)
{
var bmp = new WriteableBitmap(tileWidth, tileHeight);
// Force the content to layout itself properly
tile.Measure(new Size(tileWidth, tileHeight));
tile.Arrange(new Rect(0, 0, tileWidth, tileHeight));
bmp.Render(tile, null);
bmp.Invalidate();
// Obtain the virtual store for the application
IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();
using (IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream(IsolatedStorageFileName + suffix, FileMode.Create, myStore))
{
try
{
bmp.SaveJpeg(fileStream, tileWidth, tileHeight, 0, 100);
}
catch (Exception)
{
return null;
}
}
return new Uri("isostore:/" + IsolatedStorageFileName + suffix, UriKind.Absolute);
}
// save the user control to isolated storage and prepare the FlipTileData object
wideFrontTileImage = SaveJpegToIsolatedStorage((UserControl)this.WideFrontTile, "_wide_front", 691);
var flipTileData = new FlipTileData();
flipTileData.WideBackgroundImage = wideFrontTileImage;
return flipTileData;
// update the live tile
var shellTile = ShellTile.ActiveTiles.FirstOrDefault();
shellTile.Update(customTile.GetFlipTileData(data.UndoneMemosCount == "0" && data.TotalMemosCount == "0"));
I think the reason that's causing all this is, when the user clicks the Back button too quickly, the OS terminates all the processes running within the app and the rendering wasn't done at that time. I'm thinking if there's a way to know when the rendering is finished, so I can cancel the Back button and wait until it's finished then manually exit the app. But I simply dunno how...
Any help on this one will be greatly appreciated!
I have ran into similar issue in my WP8 app. The problem was that I was updating my Tile in ApplicationDeactivated event handler. The thing is you should not update your tiles there, but rather in your MainPage.OnNavigatedFrom override. Once I changed this, it works just fine.
I discovered AForge a few days ago with a goal in mind. I wanted to be able to manipulate an image's colors. However, after trying several different methods I have not been able to find a resolution.
I looked thoroughly through the documentation they give, but it hasn't been any help to me. The specific part of the documentation I have been using is:
http://www.aforgenet.com/framework/docs/html/3aaa490f-8dbe-f179-f64b-eedd0b9d34ac.htm
The example they give:
// create filter
YCbCrLinear filter = new YCbCrLinear( );
// configure the filter
filter.InCb = new Range( -0.276f, 0.163f );
filter.InCr = new Range( -0.202f, 0.500f );
// apply the filter
filter.ApplyInPlace( image );
I replicated it for a button click event, but the 'image' portion of it wasn't specified. I converted the image inside of my picturebox to a bitmap, then referenced it in the last line thinking that it would work. But it had no affect at all.
My code is the following:
private void ColManButton_Click(object sender, EventArgs e)
{
Bitmap newimage = new Bitmap(pictureBox1.Image);
YCbCrLinear filter = new YCbCrLinear();
filter.InCb = new Range(-0.276f, 0.163f);
filter.InCr = new Range(-0.202f, 0.500f);
filter.ApplyInPlace(newimage);
}
My question essentially is, to anyone familiar or willing to help with this framework, how do I take my image and manipulate its color using AForge's YCbCrLinear Class under my button's click event?
Remember to set the picture box image after you have applied the filtering.
private void ColManButton_Click(object sender, EventArgs e)
{
Bitmap newimage = new Bitmap(pictureBox1.Image);
YCbCrLinear filter = new YCbCrLinear();
filter.InCb = new Range(-0.276f, 0.163f);
filter.InCr = new Range(-0.202f, 0.500f);
filter.ApplyInPlace(newimage);
pictureBox1.Image = newimage;
}
at the aforge website you can download the source code of a sample filter application, did you try it ?
For connecting to webservices i wrote the following code.
WebClient wc = new WebClient();
wc.DownloadStringAsync(new Uri("http://www.Webservices.asmx"));
wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
void wc_DownloadStringCompleted(object sender,DownloadStringCompletedEventArgs e)
{
Debug.WriteLine("Web service says: " + e.Result);
using (var reader = new StringReader(e.Result))
{
String str = reader.ReadToEnd();
}
}
by using above code Get the string result.But i want get the result in HTMLVisulaizer then i know the what are the methods having that webservice.then i can easily access the particular method.
Please tell me how to call a web service method in Windows phone 7?in webservice i am having 5 webmethods.how to get that and how to call the Particular webmenthod.
Please tell me thanks in advance.
#venkateswara Are you talking about obtaining a list of known WebReference methods so you know which one to call in you code? Do you not see the this of known method calls when you add the WebReference to your WP7 project? Since you will be developing the WP7 app in VS I can't see the reason you would want to do this. Even if you don't own the webservice yourself, you will need to connect to it from VS in order to add the reference to your project.
Below is the screen in VS2010 where a WebReference is added. The Operations are listed on the right.
Once added you can use the ObjectBrowser to understand how the methods should be called.
Please let me know if I have missed something from your question.
#Jason James
The first step:
You must add referent Services ,like Jason James has very detailed instructions .
step 2 :
You can open App.xaml.cs , in Functions Apps
public Apps()
{
// Global handler for uncaught exceptions.
UnhandledException += Application_UnhandledException;
// Show graphics profiling information while debugging.
if (System.Diagnostics.Debugger.IsAttached)
{
// Display the current frame rate counters.
Application.Current.Host.Settings.EnableFrameRateCounter = true;
// Show the areas of the app that are being redrawn in each frame.
//Application.Current.Host.Settings.EnableRedrawRegions = true;
// Enable non-production analysis visualization mode,
// which shows areas of a page that are being GPU accelerated with a colored overlay.
//Application.Current.Host.Settings.EnableCacheVisualization = true;
}
// You can declare objects here that you will use
//Examlpe: NameservicesReferent.(Function that returns services) = new NameservicesReferent.(Function that returns services)();
Ws_Function = new Nameservices.ServiceSoapClient();
}
step 3:
in Mainpage.xaml.cs
GlobalVariables.Ws_advertise.getLinkAdvertiseIndexCompleted += new EventHandler<advertise.getLinkAdvertiseIndexCompletedEventArgs>(Ws_advertise_getLinkAdvertiseIndexCompleted);
GlobalVariables.***NameWedservise***.getLinkAdvertiseIndexAsync("**parameters to be passed**");
step 4:
void Ws_advertise_getLinkAdvertiseIndexCompleted(object sender, advertise.getLinkAdvertiseIndexCompletedEventArgs e)
{
//function returns the results to you, the example here is an array
string[] array = null;
try
{
array = e.result;
if(array != null)
}
cath(exception ex)
{
}
finally
{
array = null;
GlobalVariables.Ws_advertise.getLinkAdvertiseIndexCompleted -= new EventHandler<advertise.getLinkAdvertiseIndexCompletedEventArgs>(Ws_advertise_getLinkAdvertiseIndexCompleted);
}
}