Browsing by Author "Figueiredo, Mauro"
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- 3D Modeling of the Milreu Roman Heritage with UAVsPublication . Rodrigues, José Inácio; Figueiredo, Mauro; Bernardes, João Pedro; Gonçalves, CésarIn this paper we present a methodology to build a 3D model of a roman heritage site in the South of Portugal, known as Milreu, covering a region of about one hectare. Today's Milreu ruins, a national heritage site, were once part of a 4rd century, luxurious villa-style manor house, which was subsequently converted into a thriving farm. Due to its relevance, it is important to make the 3D model of the Milreu ruins, to be available for the exploration in the Web and for virtual and augmented reality applications for mobile devices. This paper demonstrates the use of UAVs for the reconstruction of the 3D models of the ruins from vertical and oblique aerial photographs. To enhance the model quality and precision, terrestrial photographs were also incorporated in the workflow. This model is georeferenced, which give us the possibility to automatically determine accurate measurements of the Roman structures.
- An efficient parallel collision detection algorithm for virtual prototype environmentsPublication . Figueiredo, Mauro; Terrence, FernandoThe automatic recognition of geometric constraints in virtual assembly and maintenance operations relies in the determination of intersecting surfaces between virtual prototypes. This is a key challenge in many virtual prototype applications, where it is necessary to find collisions precisely and interactively. This paper presents a novel algorithm to determine intersecting surfaces at interactive speed in a virtual prototyping environment. The proposed algorithm is based on the Overlapping AxisAligned Bounding Box (OAABB). The OAABB concept is used effectively to eliminate the number of surfaces that cannot intersect and improve performance. The algorithm also facilitates the implementation using parallel computing methods. OpenMP is used, taking advantage of shared memory multiple processors and reducing the overall time complexity of the collision detection algorithm. To achieve an efficient parallel simulation, it is necessary to provide an efficient load balancing scheme. Our experiences in parallelising the code to achieve a better work distribution are also described. Results show that the proposed collision detection achieves interactive rates in real industrial applications as desired.
- Anamorfoses e outras tecnologias imersivas no contexto da educação artísticaPublication . Flores, Manuel; Araújo, António; Figueiredo, MauroApresentamos uma proposta de investigação na área da média-arte digital onde se pretende combinar os princípios da anamorfose com as novas tecnologias baseadas na realidade aumentada. Esta perspetiva tem subjacente a ideia de que é possível relacionar a anamorfose cónica com as projeções realizadas em Realidade Aumentada. No âmbito desta investigação propõe-se uma abordagem ao estudo da perspetiva centrada nos contributos de Dürer e nos conceitos fundamentais da construção de anamorfoses. Pretende-se refletir sobre as possibilidades desta abordagem metodológica e analisar os seus contributos no desenvolvimento da capacidade de visualização espacial dos alunos do 3º ciclo do ensino básico e, desta forma, facilitar a compreensão dos conceitos relativos ao ensino da geometria.
- Augmented reality and holograms for the visualization of mechanical engineering partsPublication . Figueiredo, Mauro; Cardoso, Pedro J. S.; Gonçalves, C. D. F.; Rodrigues, J. M. F.There is an increasing number of students using tablets in schools. Mobile devices gained popularity as an educational tool and there are many schools that use them frequently in educational activities to improve learning. We found that first year students of mechanical engineering in general have difficulties in understanding 3D shapes from 2D views. There are many Augmented Reality (AR) applications available that can be used to create educational contents for these mobile devices. On the other hand, there is an increasing interest in making holograms. In this paper we studied the most popular AR systems and show examples of using an AR system for the visualization of 3D models. We also present the creation of a low cost prototype, the EducHolo, that enables the visualization of holograms supported by tablets. With this prototype students can visualize the hologram of mechanical parts, providing a better perception of the model 3D shape and improving the ability of making the 2D orthographic views and perspectives that they study in the first year of mechanical engineer.
- Augmented reality system to assist inexperienced pool playersPublication . Figueiredo, Mauro; Gomes, Cristina; Gomes, José; Lopes, JoãoCombining mobile technologies with Augmented Reality (AR) has recently enabled the ubiquity of AR technologies in our everyday life. Many schools are implementing 1:1 iPad or Bring Your Own Device (BYOD) programs and in this way smartphones and tablets are being increasingly used by students to improve learning. There are many augmented reality (AR) applications available that can be used to create educational contents for these mobile devices. This paper surveys the most popular augmented reality applications and we select AR eco-systems to be used in daily teaching activities which are user friendly, do not require programming skills and are free. Different augmented reality technologies are explored in this paper to create teaching activities with animations, 3D models and other information to be shown on top of interactive documents. It is presented the creation of a novel augmented reality book that was developed with teachers and students. Several examples are also presented that are used in educational activities, from kindergarten to elementary and secondary schools, to improve reading, comprehension and learning of music. It is also presented the application of augmented reality to help students of the first year of mechanical engineering to better understand the drawing of orthographic views. These examples illustrate several approaches that were presented to students of Science Education at the Algarve University that will be future teachers.
- Augmented reality tools and learning practice in mobile-learningPublication . Figueiredo, Mauro; Gomes, José; Gomes, Cristina; Lopes, JoãoThere are many augmented reality (AR) applications available that can be used to create educational contents for these mobile devices. This paper surveys the most popular augmented reality applications and we select AR eco-systems to be used in daily teaching activities which are user friendly, do not require programming skills and are free. Different augmented reality technologies are explored in this paper to create teaching activities with animations, videos and other information to be shown on top of interactive documents. It is presented the creation of a novel augmented reality book that was developed with teachers and students. Several examples are also presented that are used in educational activities, from kindergarten to elementary and secondary schools, to improve reading, comprehension and learning of music.
- Cave chamber data modeling and 3D Web visualizationPublication . Silvestre, Ivo; Rodrigues, J. I.; Figueiredo, Mauro; Veiga-Pires, C.Underground caves and its specific structures are important for geomorphological studies. In this paper we present tools to identify and map speleothems by surveying cave chambers interiors. The cave chamber was surveyed using Terrestrial Laser Scanning to acquire point clouds with high level of detail for 3D model generation. This data with 45 million points is useful for either reconstruction, geomorphological studies or virtual visits of caves. With this point cloud we generated a 3D-mesh to represent the surface model of the cave chamber, which is important to study its geomorphological features. A topological structure of the 3D-mesh was also implemented to get an efficient algorithm to help identifying stalactites. The possibility to publish 3D data on the Web is of particular interest for the geospatial field. For this reason, it was decided to make the cave model available in the Web by developing a 3D graphical interface where users can navigate and interact with the three-dimensional models of the cave. For this Web3D framework it was used X3D, WebGL and X3DOM. Such solution does not require any additional plug-ins or components.
- ComPassos com histórias : narrativas digitais de caminhaPublication . Carvalho, Isabel Cristina; Bidarra, José; Figueiredo, MauroComPassos com histórias explora o contributo da média-arte locativa para o registo da identidade e das vivências de uma comunidade através da exploração do espaço urbano da Vila de Caminha, geolocalizando narrativas digitais de memórias urbanas e, incitando à (re)descoberta desse espaço, num exercício de deriva pelas memórias dos seus habitantes. O acesso a essas memórias é facilitado por duas vias, num plano digital através de um eBook interativo e num plano físico, real, através de uma aplicação, com tecnologia de Realidade Aumentada, que permite a visualização em formato de pequenos vídeos in loco.
- Creating learning activities using augmented reality toolsPublication . Figueiredo, Mauro; Gomes, José; Gomes, CristinaThere is an increasing number of students usingsmartphones and tablets in schools. Mobile devices gained pop-ularity as an educational tool and there are many schools thatused them frequently in educational activities to improve learning.There are many augmented reality (AR) applications availablethat can be used to create educational contents for these mobiledevices. This paper surveys the most popular augmented realityapplications. Our goal is to select AR eco-systems, for educationalpurposes, that are user friendly, that do not require programmingskills and are free, so that they can be used in daily teachingactivities. We also present teaching activities created with thesetools that use different augmented reality technologies for creatinganimations, 3D models and other information to be shown ontop of interactive documents. The examples presented are used ineducational activities in kindergarten and to improve the learningof music and orthographic views in elementary and secondaryschools.
- A deriva na análise do espaço urbano, na perspetiva da média-arte locativaPublication . Carvalho, Isabel Cristina; Bidarra, José; Figueiredo, MauroEste artigo reflete sobre a deriva urbana, em contexto pedagógico, realizada na Vila de Caminha, como prática artista e enquanto exercício de experimentação, leitura e análise daquele espaço. Através de tecnologia móvel, nomeadamente smartphones e tablets, aborda-se a média-arte locativa como instigadora da experimentação de espaços urbanos. Explora-se a deriva como exercício de apreensão urbana e processo de procura e levantamento de narrativas locativas. Com base numa investigação teórica e na análise de resultados empíricos obtidos com tecnologias de realidade aumentada atualmente existentes, reflete-se ainda acerca do papel da média-arte locativa na vivência de espaços urbanos e no seu contributo na preservação da memória e identidades locais, pela descoberta e partilha de narrativas georreferenciadas, contextualizando-as e imbuindo-as no próprio espaço físico.