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As novas tecnologias informacionais mudaram o nosso modo de vida, modificaram nossos hábitos e transformaram profundamente a sociedade. A evolução da informática e da internet trouxe um mundo no qual estamos constantemente conectados através de smartphones, tablets e/ou computadores. Entretanto, na era da informação a velocidade e a facilidade de acesso aos dados, muitas vezes, têm se mostrado superiores à nossa capacidade de absorvê-los e transformar a informação em conhecimento. Neste contexto, novas mídias emergem criando possibilidades de comunicação, dentre as quais destacam-se as tecnologias 3D. Essas abrem novas possibilidades nas mais diversas áreas, oferecendo maior liberdade para que os objetos sejam representados e manipulados no espaço. O campo da educação, por sua vez, tem encontrado dificuldades de absorver estas tecnologias e utilizá-las como ferramentas didáticas. Acredita-se que as tecnologias 3D possam vir a ser importantes instrumentos para a prática pedagógica. O presente trabalho tem como objetivo pesquisar possibilidades de ampliação e facilitação do uso da tecnologia 3D para fins educacionais e de preservação histórica. Para tal, realizou-se uma pesquisa sobre como esta tecnologia tem sido utilizada em ambos os campos. Após, foi realizado levantamento das principais técnicas de digitalização em 3D. Em seguida, foram testadas as principais plataformas e tecnologias para a exibição deste tipo de conteúdo: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D e Unity. A partir desta análise, em caráter experimental, criou-se um repositório virtual 3D, o qual encontra-se hospedado nos servidores da UFRGS. O repositório facilita a divulgação de modelos 3D por parte dos criadores deste tipo de conteúdo, pois permite a sua inserção na internet de forma simples, sem a necessidade de conhecimento prévio de programação. Deste modo, o conteúdo gerado pode ser visualizado em computadores e/ou dispositivos móveis, diretamente no navegador, dispensando a instalação de programas complementares, contribuindo para a propagação deste tipo de mídia. Também é possível disponibilizar as obras digitalizadas para reprodução física, mediante técnicas de prototipagem rápida como manufatura aditiva (popularmente conhecida como impressão 3D) e/ou usinagem em CNC. Para a criação do conteúdo 3D, digitalizou-se em três dimensões de quatro elementos, fachadas específicas dos prédios históricos da UFRGS. Os modelos gerados a partir da digitalização foram disponibilizados, através do repositório 3D, e podem ser acessadas no endereço: www.ufrgs.br/ldsm/3d. O repositório 3D dos prédios da UFRGS é uma ação inovadora com propósitos educacionais e de conservação de patrimônio histórico, agindo como catalisador, onde arte, tecnologia e educação convergem em prol da construção do conhecimento. / The new informational technologies have changed our way of life, have changed our habits and profoundly transformed the society. The evolution of computer science and the internet brought a world in which we are constantly connected, whether through smartphones, tablets, and/or computers. However, in this Information Age, the speed and ease of access to data often has been shown to be superior to our capacity to absorb them and to transform the information into knowledge. Within this context, new media has emerged creating new possibilities of communication, among which stand out the 3D technologies, which open up new possibilities in the most diverse areas, offering greater freedom for the objects that are represented and manipulated in space. Fields of education, in this matter, have found difficulties to absorb these technologies and use them as teaching tools. In this context, it is believed that 3D technologies are likely to be important instruments for the pedagogic practice. The present study aims to search possibilities of expansion and facilitation in the use of 3D technology for educational purposes and historical preservation. With this research, it was studied on how this technology has been used in both fields. After this, it was done a survey of the main techniques of 3D scanning. Then, were tested major platforms and technologies for the display of this content type: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D and Unity. Trough this analysis, for experimental, purposes was done the creation of a 3D virtual repository which is hosted on the servers of UFRGS. The repository facilitates the dissemination of 3D content by content creators, as it allows its insertion on the Internet in a simple way, without the need for programming skills, so that the content generated can be viewed on computers and/or mobile devices directly in the browser, without the need to install additional programs, contributing to the popularization of this type of media. It is also possible to transform the digitized 3D data creating physical models through rapid prototyping techniques, such as additive manufacturing (popularly known as 3D printing) and/or CNC machining. To create 3D content, 3D scanning was performed of four elements of specific historical UFRGS buildings facades. The models generated from scanning were provided through 3D repository, that can be accessed at: www.ufrgs.br/ldsm/3d. The 3D buildings of UFRGS repository is an innovative action, with educational purposes besides the conservation of historical heritage, acting as a catalyst where art, technology and education converge towards the construction of knowledge.

Modern 3D printing technology is becoming a more viable option for use in industrial manufacturing. As the speed and precision of rapid prototyping technology improves, so too must the 3D scanning and verification technology. Current 3D scanning technology (such as CT Scanners) produce the resolution needed for micron precision inspection. However, the method lacks in speed. Some scans can be multiple gigabytes in size taking several minutes to acquire and process. Especially in high volume manufacturing of 3D printed parts, such delays prohibit the widespread adaptation of 3D scanning technology for quality control. The limiting factors of current technology boil down to computational and processing power along with available sensor resolution and operational frequency. Realizing a 3D scanning system that produces micron precision results within a single minute promises to revolutionize the quality control industry. The specific 3D scanning method considered in this thesis utilizes a line profile triangulation sensor with high operational frequency, and a high-precision mechanical actuation apparatus for controlling the scan. By syncing the operational frequency of the sensor to the actuation velocity of the apparatus, a 3D point cloud is rapidly acquired. Processing of the data is then performed using MATLAB on contemporary computing hardware, which includes proper point cloud formatting and implementation of the Iterative Closest Point (ICP) algorithm for point cloud stitching. Theoretical and physical experiments are performed to demonstrate the validity of the method. The prototyped system is shown to produce multiple loosely-registered micron precision point clouds of a 3D printed object that are then stitched together to form a full point cloud representative of the original part. This prototype produces micron precision results in approximately 130 seconds, but the experiments illuminate upon the additional investments by which this time could be further reduced to approach the revolutionizing one-minute milestone.

As novas tecnologias informacionais mudaram o nosso modo de vida, modificaram nossos hábitos e transformaram profundamente a sociedade. A evolução da informática e da internet trouxe um mundo no qual estamos constantemente conectados através de smartphones, tablets e/ou computadores. Entretanto, na era da informação a velocidade e a facilidade de acesso aos dados, muitas vezes, têm se mostrado superiores à nossa capacidade de absorvê-los e transformar a informação em conhecimento. Neste contexto, novas mídias emergem criando possibilidades de comunicação, dentre as quais destacam-se as tecnologias 3D. Essas abrem novas possibilidades nas mais diversas áreas, oferecendo maior liberdade para que os objetos sejam representados e manipulados no espaço. O campo da educação, por sua vez, tem encontrado dificuldades de absorver estas tecnologias e utilizá-las como ferramentas didáticas. Acredita-se que as tecnologias 3D possam vir a ser importantes instrumentos para a prática pedagógica. O presente trabalho tem como objetivo pesquisar possibilidades de ampliação e facilitação do uso da tecnologia 3D para fins educacionais e de preservação histórica. Para tal, realizou-se uma pesquisa sobre como esta tecnologia tem sido utilizada em ambos os campos. Após, foi realizado levantamento das principais técnicas de digitalização em 3D. Em seguida, foram testadas as principais plataformas e tecnologias para a exibição deste tipo de conteúdo: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D e Unity. A partir desta análise, em caráter experimental, criou-se um repositório virtual 3D, o qual encontra-se hospedado nos servidores da UFRGS. O repositório facilita a divulgação de modelos 3D por parte dos criadores deste tipo de conteúdo, pois permite a sua inserção na internet de forma simples, sem a necessidade de conhecimento prévio de programação. Deste modo, o conteúdo gerado pode ser visualizado em computadores e/ou dispositivos móveis, diretamente no navegador, dispensando a instalação de programas complementares, contribuindo para a propagação deste tipo de mídia. Também é possível disponibilizar as obras digitalizadas para reprodução física, mediante técnicas de prototipagem rápida como manufatura aditiva (popularmente conhecida como impressão 3D) e/ou usinagem em CNC. Para a criação do conteúdo 3D, digitalizou-se em três dimensões de quatro elementos, fachadas específicas dos prédios históricos da UFRGS. Os modelos gerados a partir da digitalização foram disponibilizados, através do repositório 3D, e podem ser acessadas no endereço: www.ufrgs.br/ldsm/3d. O repositório 3D dos prédios da UFRGS é uma ação inovadora com propósitos educacionais e de conservação de patrimônio histórico, agindo como catalisador, onde arte, tecnologia e educação convergem em prol da construção do conhecimento. / The new informational technologies have changed our way of life, have changed our habits and profoundly transformed the society. The evolution of computer science and the internet brought a world in which we are constantly connected, whether through smartphones, tablets, and/or computers. However, in this Information Age, the speed and ease of access to data often has been shown to be superior to our capacity to absorb them and to transform the information into knowledge. Within this context, new media has emerged creating new possibilities of communication, among which stand out the 3D technologies, which open up new possibilities in the most diverse areas, offering greater freedom for the objects that are represented and manipulated in space. Fields of education, in this matter, have found difficulties to absorb these technologies and use them as teaching tools. In this context, it is believed that 3D technologies are likely to be important instruments for the pedagogic practice. The present study aims to search possibilities of expansion and facilitation in the use of 3D technology for educational purposes and historical preservation. With this research, it was studied on how this technology has been used in both fields. After this, it was done a survey of the main techniques of 3D scanning. Then, were tested major platforms and technologies for the display of this content type: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D and Unity. Trough this analysis, for experimental, purposes was done the creation of a 3D virtual repository which is hosted on the servers of UFRGS. The repository facilitates the dissemination of 3D content by content creators, as it allows its insertion on the Internet in a simple way, without the need for programming skills, so that the content generated can be viewed on computers and/or mobile devices directly in the browser, without the need to install additional programs, contributing to the popularization of this type of media. It is also possible to transform the digitized 3D data creating physical models through rapid prototyping techniques, such as additive manufacturing (popularly known as 3D printing) and/or CNC machining. To create 3D content, 3D scanning was performed of four elements of specific historical UFRGS buildings facades. The models generated from scanning were provided through 3D repository, that can be accessed at: www.ufrgs.br/ldsm/3d. The 3D buildings of UFRGS repository is an innovative action, with educational purposes besides the conservation of historical heritage, acting as a catalyst where art, technology and education converge towards the construction of knowledge.

Digital fabrication technologies such as 3D printers entail a radical change to the traditional consumer-producer paradigm. Combined with other recent developments, self-styled Makers design and fabricate sophisticated devices and interactive technologies that would otherwise never have existed. However, stopping the uninitiated novice from making use of this potential is complex CAD software, and a high barrier to entry. In this study a series of workshops explore the potential of combining traditional handicraft materials – such as clay, paper and fabric – with 3D scanning to enable novices to work with 3D printers. Based on the results a set of instruction were created detailing the process of making three types of practical objects, covering the entire process from the making and subsequent 3D scanning of a physical object, to the software clean-up and final 3D printing. The results suggest that whilst the explored method can enable novices to create 3D printable models, a certain mindset is required for the novice to do so effectively. / Innovation +

As novas tecnologias informacionais mudaram o nosso modo de vida, modificaram nossos hábitos e transformaram profundamente a sociedade. A evolução da informática e da internet trouxe um mundo no qual estamos constantemente conectados através de smartphones, tablets e/ou computadores. Entretanto, na era da informação a velocidade e a facilidade de acesso aos dados, muitas vezes, têm se mostrado superiores à nossa capacidade de absorvê-los e transformar a informação em conhecimento. Neste contexto, novas mídias emergem criando possibilidades de comunicação, dentre as quais destacam-se as tecnologias 3D. Essas abrem novas possibilidades nas mais diversas áreas, oferecendo maior liberdade para que os objetos sejam representados e manipulados no espaço. O campo da educação, por sua vez, tem encontrado dificuldades de absorver estas tecnologias e utilizá-las como ferramentas didáticas. Acredita-se que as tecnologias 3D possam vir a ser importantes instrumentos para a prática pedagógica. O presente trabalho tem como objetivo pesquisar possibilidades de ampliação e facilitação do uso da tecnologia 3D para fins educacionais e de preservação histórica. Para tal, realizou-se uma pesquisa sobre como esta tecnologia tem sido utilizada em ambos os campos. Após, foi realizado levantamento das principais técnicas de digitalização em 3D. Em seguida, foram testadas as principais plataformas e tecnologias para a exibição deste tipo de conteúdo: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D e Unity. A partir desta análise, em caráter experimental, criou-se um repositório virtual 3D, o qual encontra-se hospedado nos servidores da UFRGS. O repositório facilita a divulgação de modelos 3D por parte dos criadores deste tipo de conteúdo, pois permite a sua inserção na internet de forma simples, sem a necessidade de conhecimento prévio de programação. Deste modo, o conteúdo gerado pode ser visualizado em computadores e/ou dispositivos móveis, diretamente no navegador, dispensando a instalação de programas complementares, contribuindo para a propagação deste tipo de mídia. Também é possível disponibilizar as obras digitalizadas para reprodução física, mediante técnicas de prototipagem rápida como manufatura aditiva (popularmente conhecida como impressão 3D) e/ou usinagem em CNC. Para a criação do conteúdo 3D, digitalizou-se em três dimensões de quatro elementos, fachadas específicas dos prédios históricos da UFRGS. Os modelos gerados a partir da digitalização foram disponibilizados, através do repositório 3D, e podem ser acessadas no endereço: www.ufrgs.br/ldsm/3d. O repositório 3D dos prédios da UFRGS é uma ação inovadora com propósitos educacionais e de conservação de patrimônio histórico, agindo como catalisador, onde arte, tecnologia e educação convergem em prol da construção do conhecimento. / The new informational technologies have changed our way of life, have changed our habits and profoundly transformed the society. The evolution of computer science and the internet brought a world in which we are constantly connected, whether through smartphones, tablets, and/or computers. However, in this Information Age, the speed and ease of access to data often has been shown to be superior to our capacity to absorb them and to transform the information into knowledge. Within this context, new media has emerged creating new possibilities of communication, among which stand out the 3D technologies, which open up new possibilities in the most diverse areas, offering greater freedom for the objects that are represented and manipulated in space. Fields of education, in this matter, have found difficulties to absorb these technologies and use them as teaching tools. In this context, it is believed that 3D technologies are likely to be important instruments for the pedagogic practice. The present study aims to search possibilities of expansion and facilitation in the use of 3D technology for educational purposes and historical preservation. With this research, it was studied on how this technology has been used in both fields. After this, it was done a survey of the main techniques of 3D scanning. Then, were tested major platforms and technologies for the display of this content type: Cl3ver, Sketchfab, JSC3D, WebGL, Three.js, VRML, X3D, PDF3D and Unity. Trough this analysis, for experimental, purposes was done the creation of a 3D virtual repository which is hosted on the servers of UFRGS. The repository facilitates the dissemination of 3D content by content creators, as it allows its insertion on the Internet in a simple way, without the need for programming skills, so that the content generated can be viewed on computers and/or mobile devices directly in the browser, without the need to install additional programs, contributing to the popularization of this type of media. It is also possible to transform the digitized 3D data creating physical models through rapid prototyping techniques, such as additive manufacturing (popularly known as 3D printing) and/or CNC machining. To create 3D content, 3D scanning was performed of four elements of specific historical UFRGS buildings facades. The models generated from scanning were provided through 3D repository, that can be accessed at: www.ufrgs.br/ldsm/3d. The 3D buildings of UFRGS repository is an innovative action, with educational purposes besides the conservation of historical heritage, acting as a catalyst where art, technology and education converge towards the construction of knowledge.

La mesure de la forme 3D du visage est une problématique qui attire de plus en plus de chercheurs et qui trouve son application dans des domaines divers tels que la biométrie, l’animation et la chirurgie faciale. Les solutions actuelles sont souvent basées sur des systèmes projecteur/caméra et utilisent de la lumière structurée pour compenser l’insuffisance de la texture faciale. L’information 3D est ensuite calculée en décodant la distorsion des patrons projetés sur le visage. Une des techniques les plus utilisées de la lumière structurée est la codification sinusoïdale par décalage de phase qui permet une numérisation 3D de résolution pixélique. Cette technique exige une étape de déroulement de phase, sensible à l’éclairage ambiant surtout quand le nombre de patrons projetés est limité. En plus, la projection de plusieurs patrons impacte le délai de numérisation et peut générer des artefacts surtout pour la capture d’un visage en mouvement. Une alternative aux approches projecteur-caméra consiste à estimer l’information 3D par appariement stéréo suivi par une triangulation optique. Cependant, le modèle calculé par cette technique est généralement non-dense et manque de précision. Des travaux récents proposent la super-résolution pour densifier et débruiter les images de profondeur. La super-résolution a été particulièrement proposée pour les caméras 3D TOF (Time-Of-Flight) qui fournissent des scans 3D très bruités. Ce travail de thèse propose une solution de numérisation 3D à faible coût avec un schéma de super-résolution spatio-temporelle. Elle utilise un système multi-caméra étalonné assisté par une source de projection non-étalonnée. Elle est particulièrement adaptée à la reconstruction 3D de visages, i.e. rapide et mobile. La solution proposée est une approche hybride qui associe la stéréovision et la codification sinusoïdale par décalage de phase, et qui non seulement profite de leurs avantages mais qui surmonte leurs faiblesses. Le schéma de la super-résolution proposé permet de corriger l’information 3D, de compléter la vue scannée du visage en traitant son aspect déformable. / 3D face measurement is increasingly demanded for many applications such as bio-metrics, animation and facial surgery. Current solutions often employ a structured light camera/projector device to overcome the relatively uniform appearance of skin. Depth in-formation is recovered by decoding patterns of the projected structured light. One of the most widely used structured-light coding is sinusoidal phase shifting which allows a 3Ddense resolution. Current solutions mostly utilize more than three phase-shifted sinusoidal patterns to recover the depth information, thus impacting the acquisition delay. They further require projector-camera calibration whose accuracy is crucial for phase to depth estimation step. Also, they need an unwrapping stage which is sensitive to ambient light, especially when the number of patterns decreases. An alternative to projector-camera systems consists of recovering depth information by stereovision using a multi-camera system. A stereo matching step finds correspondence between stereo images and the 3D information is obtained by optical triangulation. However, the model computed in this way generally is quite sparse. To up sample and denoise depth images, researchers looked into super-resolution techniques. Super-resolution was especially proposed for time-of-flight cameras which have very low data quality and a very high random noise. This thesis proposes a3D acquisition solution with a 3D space-time non-rigid super-resolution capability, using a calibrated multi-camera system coupled with a non calibrated projector device, which is particularly suited to 3D face scanning, i.e. rapid and easily movable. The proposed solution is a hybrid stereovision and phase-shifting approach, using two shifted patterns and a texture image, which not only takes advantage of the assets of stereovision and structured light but also overcomes their weaknesses. The super-resolution scheme involves a 3D non-rigid registration for 3D artifacts correction in the presence of small non-rigid deformations as facial expressions.

Le corps humain et les vêtements sont toujours en interaction directe avec l’environnement, le corps devant maintenir sa température à environ 37°C. Les transferts de chaleur sont affectés non seulement par les propriétés de l’étoffe constitutives du vêtement, mais également par l’épaisseur de la couche d’air entre le corps et le vêtement. Les propriétés thermiques de la couche d’air dépendent de son étendue, influencée par les courbures du corps humain, des propriétés mécaniques de l’étoffe et de la forme du vêtement. Il est donc nécessaire de déterminer la forme 3D du corps et la répartition, l’étendue et l’épaisseur de la couche d’air ainsi que les zones de contact entre la peau et le vêtement dans des conditions posturales de la vie courante. Dans la présente étude, l’influence thermique de couches d’air homogènes (épaisseur constante) et hétérogènes (épaisseur variable) a été montrée. De plus, la distribution des couches d’air et de l’aire de contact réelle a été analysée minutieusement. L’influence des conditions posturales (à l’aide d’un mannequin) et du mouvement (à l’aide d’un logiciel de simulation de mouvement) a été étudiée dans différents cas. Une méthode de post-traitement des données provenant du logiciel de simulation 3D de mouvement a alors été mise au point. Les résultats montrent que le niveau de confort peut être ajusté en sélectionnant l’étoffe et la forme du vêtement et que cela dépend de la région du corps. La connaissance issue de cette étude sera directement utilisée en modélisation des transferts de chaleur au travers des vêtements et contribue à l’amélioration de la conception des vêtements pour la protection ou la pratique sportive. / In real life, human body and clothing are always in direct interaction with environment, where human body attempts to keep its core temperature constant at around 37 °C by physiological thermoregulatory processes. The heat transfer from the wearer’s body to the environment is affected not only by the fabric properties but also by the presence of air layers and the contact between body and garment. The thermal properties of air layer are related to its size, which in turn, depends on the form of the wearer’s body, mechanical properties of fabric and garment design. Therefore, it is necessary to determine the three dimensional (3D) map and the quantitatively determination of air layers and contact area on the garment in real life situations, such as for various body postures and movement. In the present study, a comparison of the thermal effect of the heterogeneous and homogeneous air layers was sought. Additionally, the distribution of air layers and the contact area for lower body garments were analysed systematically. The effect of various body posture and movement on sought parameters was investigated. Moreover, new method was introduced to post-process the sought parameters for the ready output from 3D simulation software. Consequently, the results of this study indicated that the comfort level of the human body can be adjusted by selection of fabric type and the design of ease allowances in the garment depending on the body region and given purpose. The knowledge gained in this study will be directly used in modelling of the dry and latent heat transfer through garment and contribute to the improvement of clothing design for protective and active sport garments.

This Diploma Thesis deals with modern technologies such as 3D scanning, rapid prototyping and vacuum casting to production of prototype form. It considers advantages and disadvantages of the modern technologies compared to traditional process of manufacturing prototype form and economical contribution using the modern technologies. Part of the thesis considers a choice of suitable manufacturing technology of a particular product.

Die vorliegende Arbeit befasst sich mit der Erfassung von Oberflächen mittels Streifenprojektionsverfahren. Dabei wird ein Berechnungsmodell erarbeitet, welches den durch eine Aufnahme erfassten Bereich der Objektoberfläche berechnet und bewertet. Mithilfe einer optimalen Positionierung von Einzelaufnahmen ist es möglich, ein Objekt bei festgelegten Randbedingungen zeitsparend zu erfassen.