By KCS_Mobile
on Mon, 12/07/2015 - 20:50
Hi Team, I am working on Vuforia Cloud Recognition sample with 3D model. Here I have create one marker on Vuforia database with meta data as below: { "Texture": [ "https://docs.google.com/uc?authuser=0&id=0By0KWpXcp6hOTVJyenlYMFppZGM&export=download" ], "model": "https://docs.google.com/uc?authuser=0&id=0By0KWpXcp6hONHZwbUVqNHNCRnM&export=download"} Now I am able to Recognition my marker and meta data. And Based on Meta data, I am downloading my 3D object and Texture via “async” call. but after downloading all details, i am not able to render my 3D object of screen and when i again Recognition marker, i am able to render 3D object from my local which is previously downloaded but some time Texture is applied. My code as below for render object: - (id)initWithFrame:(CGRect)frame appSession:(SampleApplicationSession *) app viewController:(ViewController *) aViewController{ self = [super initWithFrame:frame]; if (self) { vapp = app; self.viewController = aViewController; // Enable retina mode if available on this device if (YES == [vapp isRetinaDisplay]) { [self setContentScaleFactor:2.0f]; } // Create the OpenGL ES context context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; // The EAGLContext must be set for each thread that wishes to use it. // Set it the first time this method is called (on the main thread) if (context != [EAGLContext currentContext]) { [EAGLContext setCurrentContext:context]; } self.scale = 2.0; self.tranX = 0.0; self.tranY = 0.0; offTargetTrackingEnabled = NO; [self initShaders]; } return self;} - (void)renderFrameQCAR{ [self setFramebuffer]; // Clear colour and depth buffers glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Render video background and retrieve tracking state QCAR::State state = QCAR::Renderer::getInstance().begin(); QCAR::Renderer::getInstance().drawVideoBackground(); glEnable(GL_DEPTH_TEST); // We must detect if background reflection is active and adjust the culling direction. // If the reflection is active, this means the pose matrix has been reflected as well, // therefore standard counter clockwise face culling will result in "inside out" models. glEnable(GL_CULL_FACE); glCullFace(GL_BACK); if(QCAR::Renderer::getInstance().getVideoBackgroundConfig().mReflection == QCAR::VIDEO_BACKGROUND_REFLECTION_ON) glFrontFace(GL_CW); //Front camera else glFrontFace(GL_CCW); //Back camera for (int i = 0; i < state.getNumTrackableResults(); ++i) { //Load 3D Model // Get the trackable const QCAR::TrackableResult* result = state.getTrackableResult(i);// const QCAR::Trackable& trackable = result->getTrackable(); QCAR::Matrix44F modelViewMatrix = QCAR::Tool::convertPose2GLMatrix(result->getPose()); // OpenGL 2 QCAR::Matrix44F modelViewProjection; SampleApplicationUtils::translatePoseMatrix(self.tranX, -self.tranY, self.scale, &modelViewMatrix.data[0]); //SampleApplicationUtils::rotatePoseMatrix(90, 0, 1, 0,&modelViewMatrix.data[0]); SampleApplicationUtils::scalePoseMatrix(self.scale, self.scale, self.scale, &modelViewMatrix.data[0]); SampleApplicationUtils::multiplyMatrix(&vapp.projectionMatrix.data[0], &modelViewMatrix.data[0], &modelViewProjection.data[0]); glUseProgram(shaderProgramID); glVertexAttribPointer(vertexHandle, 3, GL_FLOAT, GL_FALSE, 0, buildingModel.vertices); glVertexAttribPointer(normalHandle, 3, GL_FLOAT, GL_FALSE, 0, buildingModel.normals); glVertexAttribPointer(textureCoordHandle, 2, GL_FLOAT, GL_FALSE, 0, buildingModel.texCoords); glEnableVertexAttribArray(vertexHandle); glEnableVertexAttribArray(normalHandle); glEnableVertexAttribArray(textureCoordHandle); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, augmentationTexture[0].textureID); glUniformMatrix4fv(mvpMatrixHandle, 1, GL_FALSE, (const GLfloat*)&modelViewProjection.data[0]); glUniform1i(texSampler2DHandle, 0 /*GL_TEXTURE0*/);// glDrawElements(GL_TRIANGLES, NUM_TEAPOT_OBJECT_INDEX, GL_UNSIGNED_SHORT, (const GLvoid*)teapotIndices); glDrawArrays(GL_TRIANGLES, 0, (int)buildingModel.numVertices); glDisableVertexAttribArray(vertexHandle); glDisableVertexAttribArray(normalHandle); glDisableVertexAttribArray(textureCoordHandle); SampleApplicationUtils::checkGlError("EAGLView renderFrameQCAR"); } glDisable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); QCAR::Renderer::getInstance().end(); [self presentFramebuffer]; if (state.getNumTrackableResults() > 0) { // we have a trackable so we stop the finder if it was on if ([viewController isVisualSearchOn]) { [viewController toggleVisualSearch]; } } else { // we have a no trackable so we retsrat the finder if not already started if (! [viewController isVisualSearchOn]) { [viewController toggleVisualSearch]; } } } - (void) loadBuildingsModel:(NSString *)path { buildingModel = [[SampleApplication3DModel alloc] initWithTxtResourcePath:path]; [buildingModel read];} - (void) loadTexture:(NSString *)path{ NSArray *list = [Constant listOfItemsInFolder:path]; if (list.count > 0) { //Remove Old Texture for (int i = 0; i < kNumAugmentationTextures; ++i) { augmentationTexture[i] = nil; } //Load New Texture for (int i = 0; i < kNumAugmentationTextures && i < list.count; ++i) { NSString *imagepath = [NSString stringWithFormat:@"%@/%@",path,list[i]]; augmentationTexture[i] = [[Texture alloc] initWithImagePath:imagepath]; //augmentationTexture[i] = [[Texture alloc] initWithImageFile:@"TextureTeapotBlue.png"]; } // Generate the OpenGL ES texture and upload the texture data for use // when rendering the augmentation for (int i = 0; i < kNumAugmentationTextures; ++i) { GLuint textureID; glGenTextures(1, &textureID); [augmentationTexture[i] setTextureID:textureID]; glBindTexture(GL_TEXTURE_2D, textureID); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);// glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, [augmentationTexture[i] width], [augmentationTexture[i] height], 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid*)[augmentationTexture[i] pngData]); } }} My Upload functions as below: - (void) onQCARUpdate: (QCAR::State *) state { // Get the tracker manager: QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance(); // Get the image tracker: QCAR::ObjectTracker* objectTracker = static_cast<QCAR::ObjectTracker*>(trackerManager.getTracker(QCAR::ObjectTracker::getClassType())); // Get the target finder: QCAR::TargetFinder* finder = objectTracker->getTargetFinder(); // Check if there are new results available: const int statusCode = finder->updateSearchResults(); if (statusCode < 0) { // Show a message if we encountered an error: NSLog(@"update search result failed:%d", statusCode); if (statusCode == QCAR::TargetFinder::UPDATE_ERROR_NO_NETWORK_CONNECTION) { [self showUIAlertFromErrorCode:statusCode]; } } else if (statusCode == QCAR::TargetFinder::UPDATE_RESULTS_AVAILABLE) { if (isDownloading == false) { // Iterate through the new results: for (int i = 0; i < finder->getResultCount(); ++i) { const QCAR::TargetSearchResult* result = finder->getResult(i); // Check if this target is suitable for tracking: if (result->getTrackingRating() > 0) { isDownloading = true; dispatch_async(dispatch_get_main_queue(), ^{ [self showLoadingAnimation]; }); //Get Meta Data from Result NSString *modelfolder = [NSString stringWithFormat:@"%s",result->getUniqueTargetId()]; NSString *modelfile = [NSString stringWithFormat:@"%@/model.txt",modelfolder]; NSString *texturefolder = [NSString stringWithFormat:@"%@/Texture",modelfolder]; if([Constant isFileExist:modelfolder]) { dispatch_async(dispatch_get_main_queue(), ^{ [self.eaglView loadBuildingsModel:[Constant GetPathForFileName:modelfile]]; [self.eaglView loadTexture:[Constant GetPathForFileName:texturefolder]]; [self loadModel:finder Result:result]; isDownloading = false; }); } else { //Stop Tracking New Result if ([self isVisualSearchOn]) { [self toggleVisualSearch]; } [Constant CreateFolder:modelfolder]; const char *metadata = result->getMetaData(); NSString *jsonstr = [NSString stringWithUTF8String:metadata]; NSLog(@"Meta Data: %@",jsonstr); NSData *data = [NSData dataWithBytes:jsonstr.UTF8String length:jsonstr.length]; NSMutableDictionary *objJson = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil]; [self downloaditem:objJson[@"model"] Handler:^(NSData *data) { [Constant SaveFileInApp:modelfile File:data]; NSArray *texturelist = objJson[@"Texture"]; if([Constant isFileExist:texturefolder]) { [Constant DeleteFileFromApp:texturefolder]; } [Constant CreateFolder:texturefolder]; [self downloadTextures:texturelist Folder:texturefolder Index:0 Handler:^(void) { dispatch_async(dispatch_get_main_queue(), ^{// [self.eaglView loadBuildingsModel:[Constant GetPathForFileName:modelfile]];// [self.eaglView loadTexture:[Constant GetPathForFileName:texturefolder]];// [self loadModel:f1 Result:r1]; isDownloading = false; [self hideLoadingAnimation]; //Start Search Again if (![self isVisualSearchOn]) { [self toggleVisualSearch]; } }); }]; }]; } } } } } } I think, Main issue is app crash because result is deallocated when we have downloaded object.Guys, Are you have any suggestion to solve that issue? ThanksKamal Mittal