Augmented Reality Aided 3D Modelling

2014 ◽  
Vol 1036 ◽  
pp. 1037-1040
Author(s):  
Radu Emanuil Petruse ◽  
Ioan Bondrea ◽  
Marco Sacco ◽  
Stefano Mottura

The purpose of the article is to introduce possibilities of using Augmented Reality instructions in order to better understand technical drawings. The aim of these instructions based on 3D models is to create AR training applications and analyze their impact on the users. These instructions consist in a 3D model, superimposed over the technical drawing. The AR application also offers step by step instructions for 3D modelling in CAD software, which are very useful in creating the 3D model starting from a technical drawing. The AR application was tested by students from the Faculty of Engineering in Sibiu, obtaining great improvements in their 3D modelling times. The results of a survey that the students completed reveal that the AR modelling instructions also aids their spatial visualization capability.

Author(s):  
Agnieszka Chmurzynska ◽  
Karolina Hejbudzka ◽  
Andrzej Dumalski

During the last years the softwares and applications that can produce 3D models using low-cost methods have become very popular. What is more, they can be successfully competitive with the classical methods. The most wellknown and applied technology used to create 3D models has been laser scanning so far. However it is still expensive because of the price of the device and software. That is why the universality and accessibility of this method is very limited. Hence, the new low cost methods of obtaining the data needed to generate 3D models appeare on the market and creating 3D models have become much easier and accessible to a wider group of people. Because of their advantages they can be competitive with the laser scanning. One of the methods uses digital photos to create 3D models. Available software allows us to create a model and object geometry. Also very popular in the gaming environment device – Kinect Sensor can be successfully used as a different method to create 3D models. This article presents basic issues of 3D modelling and application of various devices, which are commonly used in our life and they can be used to generate a 3D model as well. Their results are compared with the model derived from the laser scanning. The acquired results with graphic presentations and possible ways of applications are also presented in this paper.


Author(s):  
Luis Marques ◽  
Josep Roca

The creation of 3D models of urban elements is extremely relevant for urbanists constituting digital archives and being especially useful for enriching maps and databases or reconstructing and analyzing objects/areas through time, building/recreating scenarios and implementing intuitive methods of interaction. The widespread data available online offer new opportunities to generate realistic 3D models without the need to go physically to the place. This chapter aims to demonstrate the potential 3D modeling and visualization/interaction of urban elements in the city for multiple purposes, and it is organized in four main topics: The first deals with the theoretical framework regarding the bases of the human perception of the spatial environment and the importance of 3D modelling. The second and third deal with technical procedures on terrestrial/aerial data acquisition and demonstrate alternatively data gathered online to generate 3D models for the visualization of urban elements of the city, and the fourth introduces 3D model visualization within an augmented reality environment.


Author(s):  
А.М. Galeeva ◽  
◽  
О.А. Medvedeva

The article describes the use of augmented reality technologies in the modern educational process to increase educational motivation, multimedia, and interactivity of the lecture material. The main purpose of the application: educational and cognitive. In the process of performing work, computer graphics, algorithms, and modeling methods were used. Use case: there are special images on the stand that the mobile application recognizes and shows the created 3D models of the “Sun” and “Milky Way”. In addition, while the 3D model is being displayed, a short training audio lecture will be held. To create a 3D model of objects, the Unity program was used in conjunction with the augmented reality platform Vuforia.


2017 ◽  
Vol 21 (1) ◽  
pp. 32-43 ◽  
Author(s):  
Nemanja Majstorović ◽  
Luka Čerče ◽  
Davorin Kramar ◽  
Mirko Soković ◽  
Branislav Glišić ◽  
...  

Summary Background: 3D modelling in orthodontics is becoming an increasingly widespread technique in practice. One of the significant questions already being asked is related to determining the precision of the scanner used for generating surfaces on a 3D model of the jaw. Materials and methods: This research was conducted by generating a set of identical 3D models on Atos optical 3D scanner and Lazak Scan laboratory scanner, which precision was established by measuring a set of orthodontic parameters (54 overall) in all three orthodontic planes. In this manner we explored their precision in space, since they are used for generating spatial models – 3D jaws. Results: There were significant differences between parameters scanned with Atos and Lazak Scan. The smallest difference was 0.017 mm, and the biggest 1.109 mm. Conclusion: This research reveals that both scanners (Atos and Lazak Scan), which belong to general purpose scanners, based on precision parameters can be used in orthodontics. Early analyses indicate that the reference scanner in terms of precision is Atos.


Author(s):  
M. Canciani ◽  
E. Conigliaro ◽  
M. Del Grasso ◽  
P. Papalini ◽  
M. Saccone

The development of close-range photogrammetry has produced a lot of new possibility to study cultural heritage. 3D data acquired with conventional and low cost cameras can be used to document, investigate the full appearance, materials and conservation status, to help the restoration process and identify intervention priorities. At the same time, with 3D survey a lot of three-dimensional data are collected and analyzed by researchers, but there are a very few possibility of 3D output. The augmented reality is one of this possible output with a very low cost technology but a very interesting result. Using simple mobile technology (for iPad and Android Tablets) and shareware software (in the case presented “Augment”) it is possible to share and visualize a large number of 3D models with your own device. The case study presented is a part of an architecture graduate thesis, made in Rome at Department of Architecture of Roma Tre University. We have developed a photogrammetric survey to study the Aurelian Wall at Castra Praetoria in Rome. The surveys of 8000 square meters of surface have allowed to identify stratigraphy and construction phases of a complex portion of Aurelian Wall, specially about the Northern door of Castra. During this study, the data coming out of 3D survey (photogrammetric and topographic), are stored and used to create a reverse 3D model, or virtual reconstruction, of the Northern door of Castra. This virtual reconstruction shows the door in the Tiberian period, nowadays it's totally hidden by a curtain wall but, little and significative architectural details allow to know its original feature. The 3D model of the ancient walls has been mapped with the exact type of bricks and mortar, oriented and scaled according to the existing one to use augmented reality. Finally, two kind of application have been developed, one on site, were you can see superimposed the virtual reconstruction on the existing walls using the image recognition. On the other hand, to show the results also during the graduation day, the same application has been created in off-site condition using a poster.


2018 ◽  
Vol 7 (12) ◽  
pp. 463 ◽  
Author(s):  
Chris Panou ◽  
Lemonia Ragia ◽  
Despoina Dimelli ◽  
Katerina Mania

In this paper, we present the software architecture of a complete mobile tourist guide for cultural heritage sites located in the old town of Chania, Crete, Greece. This includes gamified components that motivate the user to traverse the suggested interest points, as well as technically challenging outdoors augmented reality (AR) visualization features. The main focus of the AR feature is to superimpose 3D models of historical buildings in their past state onto the real world, while users walk around the Venetian part of Chania’s city, exploring historical information in the form of text and images. We examined and tested registration and tracking mechanisms based on commercial AR frameworks in the challenging outdoor, sunny environment of a Mediterranean town, addressing relevant technical challenges. Upon visiting one of three significant monuments, a 3D model displaying the monument in its past state is visualized onto the mobile phone’s screen at the exact location of the real-world monument, while the user is exploring the area. A location-based experience was designed and integrated into the application, enveloping the 3D model with real-world information at the same time. The users are urged to explore interest areas and unlock historical information, while earning points following a gamified experience. By combining AR technologies with location-aware and gamified elements, we aim to promote the technologically enhanced public appreciation of cultural heritage sites and showcase the cultural depth of the city of Chania.


2021 ◽  
Vol 11 (17) ◽  
pp. 8026
Author(s):  
Joshua Emmitt ◽  
Andrew McAlister ◽  
Neda Bawden ◽  
Jeremy Armstrong

The presentation of X-ray fluorescence data (XRF) assays is commonly restricted to tables or graphical representations. While the latter may sometimes be in a 3D format, they have yet to incorporate the actual objects they are from. The presentation of multiple XRF assays on a 3D model allows for more accessible presentation of data, particularly for composite objects, and aids in their interpretation. We present a method to display and interpolate assay data on 3D models using the PyVista Python package. This creates a texture of the object that displays the relative differences in elemental composition. A crested helmet from Tomb 1036 from the Casale del Fosso necropolis, Veii, Italy, is used to exemplify this method. The results of the analysis are presented and show variation in composition across the helmet, which also corresponds with macroscopic and decorrelation stretching analyses.


Author(s):  
Валерия Тюрина ◽  
Valeriya Tyurina ◽  
Сергей Ротков ◽  
Sergey Rotkov ◽  
Татьяна Мошкова ◽  
...  

The level of quality of the wireframe model obtained in the first stage of solving the problem of restoring the image of a non-planar object depends on the completeness of using the classes of graphic information used to synthesize a 3D model according to the technical drawing. In cases where the drawing is quite simple and allows you to read complete information about the object by existing procedures of automatic "reading the drawing", it is possible to restore the frame models that are fully consistent with the synthesized object. They can be used immediately for further transformations to other types of 3D models. Such frame models are characterized by the fact that all the vertices and edges included in their structure belong to the surface of the desired object. But in most practical cases, when the simulated objects correspond to real products and their technical drawing is full of difficult to formalize information, in the structure of frame models built according to standard procedures, due to a number of objective reasons, there are false geometric elements, i.e. those that are not on the surface of the desired 3D object. This leads to the ambiguity of the restoration of a unique wireframe model corresponding to the object specified in the technical drawing, and requires the development of procedures to avoid the multiplicity of solutions.


2020 ◽  
Vol 4 (2) ◽  
pp. 42
Author(s):  
Luis García Ruesgas ◽  
Francisco Valderrama Gual ◽  
Cristina Torrecillas ◽  
Amparo Verdú Vázquez

En la actualidad, existen varios procedimientos contrastados y algunas otras propuestas [1]para realizar la autoevaluación de ejercicios o exámenes de materias que se evalúan mediante ejercicios numéricos. Se comparan los valores intermedios o finales y se asigna una calificación automática de autoevaluación. Este procedimiento clásico de corrección por parte del profesor se puede ampliar [2]. La evaluación automática de los ejercicios basados en textos resulta más complicada porque, aunque la apariencia de ciertas palabras clave o sus sinónimos podría ofrecer un posible acercamiento a la evaluación mecánica de esos ejercicios, la dificultad en la evaluación de éstos reside en la interpretación de su significado [3].En el caso de los ejercicios gráficos en 2D, que son típicos del dibujo técnico, el problema es muy diferente, ya que no hay cadenas alfanuméricas para comparar. Las similitudes entre las imágenes y la comparación de entidades primitivas (objetos vectoriales) pueden ser posibles formas de evaluación [4]. El problema resulta más complicado cuando queremos evaluar mecánicamente los modelos 3D.En este artículo se presenta una compilación de posibles procedimientos a utilizar en la generación de una herramienta de autoevaluación para ejercicios de modelización industrial de sólidos, es decir, de piezas mecánicas [5]. En estos casos, ciertos parámetros como los volúmenes, las superficies, los centros de gravedad o los momentos de inercia pueden ser una primera aproximación a sus correcciones [6]. Estas evaluaciones podrían continuar con el análisis de las operaciones constructivas que existen en la modelización del objeto, tales como piezas sólidas, vaciados, agujeros, roscados, etc., todas ellas incluidas en sus árboles de modelización o listas de operaciones. La generación de una utilidad que ayude a la corrección de los ejercicios de modelización 3D sería de gran interés, ya que aportaría eficacia y agilidad al proceso de evaluación, así como una mayor objetividad al utilizar un sistema informático que aísla los factores de similitud y aplica automáticamente reglas de evaluación mensurables.AbstractNowadays, there are several contrasted procedures and other proposals [1] for the self-assessment of exercises or exams of subjects which are evaluated using numerical exercises. Intermediate or final values are compared, and an automatic qualification of self-assessment is assigned. It is possible to extend this classic correction procedure by the teacher [2]. The automatic assessment of exercises based on texts is more complicated because the appearance of certain keywords or their synonyms could offer a possible approach as a mechanical assessment of those exercises. However, the difficulty in the assessment of these exercises is the interpretation of their meaning [3].In the case of 2D graphic exercises, which are typical of technical drawing, the problem is very different, since there are no alphanumeric chains to compare. Similarities between images and the comparison of primitive entities (vector objects) may be possible ways for evaluation [4]. The problem is more complicated when we want to evaluate 3D models mechanically.This article presents a compilation of possible procedures to use in the generation of a self-assessment tool for industrial solid modelling exercises, that is, of mechanical parts [5]. In these cases, certain parameters such as volumes, surfaces, centres of gravity or moments of inertia can be a first approximation to their corrections [6]. These evaluations could continue with the analysis of the constructive operations that exist in the modelling of the object, such as solid parts, emptying, holes, threading, etc., all of them included in their modelling trees or lists of operations. The generation of a utility that helps in the correction of 3D modelling exercises would be of great interest, since it would bring effectiveness and agility to the evaluation process, as well as greater objectivity when using a computer system that isolates similarity factors and implements rules of measurable evaluation automatically.


Author(s):  
A. Uyar ◽  
N. N. Ulugtekin

In recent years, 3D models have been created of many cities around the world. Most of the 3D city models have been introduced as completely graphic or geometric models, and the semantic and topographic aspects of the models have been neglected. In order to use 3D city models beyond the task, a generalization is necessary. CityGML is an open data model and XML-based format for the storage and exchange of virtual 3D city models. Level of Details (LoD) which is an important concept for 3D modelling, can be defined as outlined degree or prior representation of real-world objects. The paper aim is first describes some requirements of 3D model generalization, then presents problems and approaches that have been developed in recent years. In conclude the paper will be a summary and outlook on problems and future work.


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