scholarly journals Development of Tactile Globe by Additive Manufacturing

2020 ◽  
pp. 419-426
Author(s):  
Yoshinori Teshima ◽  
Yohsuke Hosoya ◽  
Kazuma Sakai ◽  
Tsukasa Nakano ◽  
Akiko Tanaka ◽  
...  
Keyword(s):  
Visually Impaired ◽  
Three Dimensional ◽  
3D Models ◽  
The North ◽  
The Earth ◽  
Spherical Surfaces ◽  
Tactile Learning ◽  
Exact Shape ◽  
Prime Meridian ◽  
Topography Data

AbstractTo understand geographical positions, globes adapted for tactile learning is needed for people with visual impairments. Therefore, we created three-dimensional (3D) tactile models of the earth for the visually impaired, utilizing the exact topography data obtained by planetary explorations. Additively manufactured 3D models of the earth can impart an exact shape of relief on their spherical surfaces. In this study, we made improvements to existing models to satisfy the requirements of tactile learning. These improvements were the addition of the equator, prime meridian, and two poles to a basis model. Hence, eight types of model were proposed. The equator and the prime meridian were expressed by the belt on four models (i.e., B1, B2, B3, and B4). The height of their belt was pro-vided in four stages. The equator and the prime meridian were expressed by the gutter on four models (i.e., C1, C2, C3, and C4). The width of their gutter was provided in four stages. The north pole was expressed by a cone, while the south pole was expressed by a cylinder. The two poles have a common shape in all of the eight models. Evaluation experiments revealed that the Earth models developed in this study were useful for tactile learning of the visually impaired.

scholarly journals Mapping Orbits regarding Perturbations due to the Gravitational Field of a Cube

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Flaviane C. F. Venditti ◽  
Antonio F. B. A. Prado
Keyword(s):  
Gravitational Field ◽  
Three Dimensional ◽  
Orbital Dynamics ◽  
Keplerian Orbits ◽  
The Earth ◽  
Celestial Bodies ◽  
Good Potential ◽  
Exact Shape ◽  
Nonspherical Shape ◽  
Irregular Body

The orbital dynamics around irregular shaped bodies is an actual topic in astrodynamics, because celestial bodies are not perfect spheres. When it comes to small celestial bodies, like asteroids and comets, it is even more import to consider the nonspherical shape. The gravitational field around them may generate trajectories that are different from Keplerian orbits. Modeling an irregular body can be a hard task, especially because it is difficult to know the exact shape when observing it from the Earth, due to their small sizes and long distances. Some asteroids have been observed, but it is still a small amount compared to all existing asteroids in the Solar System. An approximation of their shape can be made as a sum of several known geometric shapes. Some three-dimensional figures have closed equations for the potential and, in this work, the formulation of a cube is considered. The results give the mappings showing the orbits that are less perturbed and then have a good potential to be used by spacecrafts that need to minimize station-keeping maneuvers. Points in the orbit that minimizes the perturbations are found and they can be used for constellations of nanosatellites.

scholarly journals ROLE OF 2D AND 3D MODELS IN JONSDAP '76

1978 ◽  
Vol 1 (16) ◽  
pp. 63
Author(s):  
A.M. Davies
Keyword(s):  
North Sea ◽  
Three Dimensional ◽  
3D Models ◽  
Three Dimensional Model ◽  
North West ◽  
The North ◽  
Dimensional Distribution ◽  
The North Sea ◽  
2D And 3D

This paper describes how a two-dimensional numerical model of the North Sea was used to determine optimum positions for the deployment of off-shore tide gauges during the JONSDAP '76 oceanographic exercise. A three-dimensional model of the North West European Shelf is also described. Using this model the three-dimensional distribution of the M2 tidal current over the shelf has been computed. This model has also been used to compute the wind induced circulation of the North Sea for the INOUT period of JONSDAP '76.

scholarly journals A bit closer to the past: the three-dimensionalization of an Inca ceremony in the north Calchaquí Valley (Salta, Argentina)

2021 ◽  
Vol 12 (25) ◽  
pp. 16
Author(s):  
Alejandro Andrés Ferrari ◽  
Joaquín Ignacio Izaguirre ◽  
Félix Alejandro Acuto
Keyword(s):  
3D Model ◽  
New Technologies ◽  
Three Dimensional ◽  
3D Models ◽  
Architectural Analysis ◽  
Archaeological Data ◽  
The North ◽  
Inca Empire ◽  
The One ◽  
New Variables

<p>Like other expansive polities, the expansion of the Inca empire across the highlands and lowlands of South America is not only a history of trade and warfare, but also of mesmerizing public performances that yielded new and memorable experiences. During highly ritualized public celebratory events, the local polities gained first-hand access to the imperial liturgy, which was vital to promote and legitimate the Inca cosmology across the newly acquired lands. Especially in the last 20 years, new technologies, an ever-growing corpus of archaeological data, as well as increasing hardware capacity and software development, make it possible to emulate the scenes that people got to witness during the Inca public events, at a home computer scale and without complex and expensive equipment. Furthermore, it prompts us to test and apply new tools and academic dissemination techniques, perhaps more suitable to current technologies and means of knowledge storage and circulation. This article presents the process of building a three-dimensional (3D) model that, on the one hand, combines historical, ethnographic, and archaeological data with Geographic Information System (GIS) datasets; on the other hand, it uses detailed architectural analysis and astronomical measurements. The objective is to yield renders that accurately display the atmospheric and lighting conditions prevailing when the site was inhabited. We will offer a detailed description of all methods, techniques, equipment, and software used to create the model and the parameters for rendering the images. The authors intend to exemplify how 3D modelling goes well beyond the 3D model as a product in itself; it becomes a fundamental tool that encouraged us to test new variables and discuss new interpretations about this settlement. Results indicate that its builders designed these settlement's Inca compounds to show off the imperial capabilities and constructive proficiency, to convey exceptional, memorable experiences to its residents and visitors, and to stage explicit links between the imperial representatives and some fundamental procreative components of the Andean cosmos. In doing so, Guitián's plaza served to stage and communicate the privileged role the imperial representatives claimed to have in a broader cosmological scheme.</p><p>Highlights:</p><ul><li><p>Inca public performances were finely choreographed so that objects, places, people, landscape, and skyscape features interacted according to the main principles of imperial cosmology.</p></li><li><p>Current mid-range hardware and specialized yet reasonably user-friendly software are suitable to create accurate three-dimensional (3D) models combining historical, archaeological, and astronomical data.</p></li><li><p>Creating such a detailed 3D model contributes to cultural heritage and academic dissemination and prompted us to revise and broaden our interpretations.</p></li></ul>

Methodical principles of development of tactile map symbology and layout

2018 ◽  
Vol 941 (11) ◽  
pp. 25-33
Author(s):  
Y.N. Andryukhina ◽  
Ya.G. Poshivaylo ◽  
V. A. Ananev
Keyword(s):  
Visually Impaired ◽  
Three Dimensional ◽  
3D Models ◽  
Social Adaptation ◽  
Educational Institutions ◽  
Functional Requirements ◽  
Blind And Visually Impaired ◽  
Visually Impaired People ◽  
Visually Challenged ◽  
Tactile Maps

Tactile maps (maps for blind and visually impaired people) play an essential role in education and social adaptation of visually challenged people. The tactile cartography rapidly develops along with the development of science and technology, and various new technical means and materials for printing three-dimensional graphics have appeared recently. The need for cartographic materials for the visually impaired is great, and so there is an urgent need for the approved methodology for tactile maps and 3D models creation, which could be used as a standard to provide educational institutions, municipalities, and other organizations working with visually challenged people with tactile cartographic materials. Recommendations on the use of map symbols and design of tactile maps are given in the article. The recommendations are based on the research carried out on the grounds of Novosibirsk Regional Special Library for the Blind and Visually Impaired and devoted to tactile perception of map symbols by various groups of blind and visually impaired users. The technology of making tactile maps is currently based on processing of images in graphic editors regardless of the geodata storage and processing systems, is labor-consuming and imposes high demands on professional skills of cartographers. The use of geoinformation systems will make it possible to automate the process of creating tactile maps in many respects. The authors’ recommendations can be the basis when developing functional requirements to software that ensures GIS options integration with automated preparation of tactile maps and other special cartographic materials for the blind and visually impaired.

scholarly journals APP 3D: el ciclo escultórico del foro de Torreparedones (Baena, Córdoba)

2018 ◽  
Vol 9 (19) ◽  
pp. 89 ◽  
Author(s):  
Antonia Merino ◽  
Carlos Márquez ◽  
Ramón González
Keyword(s):  
Mobile Application ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Point Clouds ◽  
Archaeological Site ◽  
3D Models ◽  
General Level ◽  
Archaeological Heritage ◽  
The North ◽  
The Temple

<p><strong>Extended Abstract:</strong></p><p>The  archaeological site of  Torreparedones  (Baena)  is  one  of  the  most  outstanding Roman sites  in  the  Province  of Cordoba, due  to  not  only  the  structural  remains  excavated  in  recent  decades,  but  also the  relevance through the relevance of other recovered materials. In recent years, among the recordings made during excavations and in the area of  the north  portico  of  the  forum  and  the  temple,  an  important  sculptural  group from  the high  imperial  time was documented. The sculptural cycle consists of two dynastic groups, which are currently part of the museum exhibition of Baena. The first, found in the area of the gate, consists of a toga, a female figure, a military sculpture and a fragment ideal statue (of the type hüftmantel). The second group, from the temple or near the same area, consists of two male and female seated statues representing: Divus Augustus, Divus Claudius and Diva Augusta (Livia). The latter offers a representation of idealized types, as characters portraits were produced post-mortem once the senate decreed their deification time. Because of the importance of this second group, a three-dimensional (3D) model of each of the pieces has been created. The main objective of this research, with some results presented in this article, is further development of a mobile application that allows disseminating results and promotes the use of virtual reality in the field of heritage. In order  to  carry  out  the  development  of  the  app  the  following  lines  of  action have  been followed:  1)  Recording by  the sculptural 3D scanning cycle; and 2) the development of a 3D digital catalogue for the dissemination and study within the framework of scientific research.</p><p>Data  collection of  the surface  was  performed by  using  a  3D  laser scanner,  a  tool  that  allows  obtaining sub-millimetre resolution and accuracy. After obtaining the results, we processed and checked the quality of the acquired points, best-fit and  registration  of  successive surface  recordings, and  filtering  and  cleaning  of  the  point  clouds.  To disseminate the findings of this research we chose to carry out analyses with a free application called "Sculptural Cycle Torreparedones" available for the Android operating system. With this app, the user can access all the information available, with periodic updates as the progress of other ongoing investigations. This application allows and intuitive and easy way of navigation, see the 3D models of the sculptures, as  well as access a virtual tour of Rome in 360° room of the museum of Baena.</p><p>Also, the user can access different multimedia content related to the site. As representative logo for the app, the icon of the half-head portrait of Divus Augustus was selected along with the title “3D Sculptural Cycle Torreparedones” as it is one of the largest and best known general level sculpture images. Since the app has been available since October 2017, a survey for assessing the app was conducted in order to know its impact and anticipate future necessary changes. In the course of this system, we have known the user skills in handling the application and the great interest of the youngest people in 3D.Theresults of this survey confirm that this work is an example of how this communication channel can be of service to the valorization and intelligibility of archaeological heritage. It  not  only  allows knowing the  materials recovered  during  the  excavations  of  Torreparedones  but  also  facilitates  the visitor to establish  a  direct  connection between the museum and the archaeological site. The application 3D Sculptural Cycle Torreparedones joins other works developed for 3D models digitized as a virtual catalogue, as is the Epigraphia3D app and other applications made with visits 360° as the case of the mobile application Guadiat VR -Belmez (Spain).</p>

RAY TRACING IN THREE DIMENSIONS

Geophysics ◽  
1973 ◽  
Vol 38 (3) ◽  
pp. 600-604 ◽  
Author(s):  
Pravin M. Shah
Keyword(s):  
Constant Velocity ◽  
3D Model ◽  
Three Dimensional ◽  
Special Kind ◽  
3D Models ◽  
Three Dimensions ◽  
Curved Surfaces ◽  
Dimensional Model ◽  
Spherical Surfaces ◽  
Earth Models

Special methods for tracing rays through restricted earth models are reported in the literature. For example, Sattlegger (1965) has dealt with a two‐dimensional model consisting of a sequence of constant‐velocity layers separated by interfaces that may be dipping. More recently, Sorrells et al. (1971) have considered three‐dimensional (3D) models with plane interfaces of arbitrary strike and dip and with spherical surfaces of a special kind. In the earlier part of 1970, we were using a more general algorithm which allowed us to trace rays through a 3D model consisting of plane or curved surfaces of arbitrary nature. This algorithm was presented by the author at the 41st Annual SEG convention in November, 1971. A number of inquiries received by us since that time has encouraged us to summarize our results in this brief note.

scholarly journals Visualizing 3D imagery by mouth using candy-like models

2021 ◽  
Vol 7 (22) ◽  
pp. eabh0691
Author(s):  
Katelyn M. Baumer ◽  
Juan J. Lopez ◽  
Surabi V. Naidu ◽  
Sanjana Rajendran ◽  
Miguel A. Iglesias ◽  
...  
Keyword(s):  
Computer Animation ◽  
Three Dimensional ◽  
3D Models ◽  
Rice Grain ◽  
Tactile Sensors ◽  
Recall Accuracy ◽  
3D Objects ◽  
Microscopic Models ◽  
Tactile Learning ◽  
Protein Molecules

Handheld models help students visualize three-dimensional (3D) objects, especially students with blindness who use large 3D models to visualize imagery by hand. The mouth has finer tactile sensors than hand, which could improve visualization using microscopic models that are portable, inexpensive, and disposable. The mouth remains unused in tactile learning. Here, we created bite-size 3D models of protein molecules from “gummy bear” gelatin or nontoxic resin. Models were made as small as rice grain and could be coded with flavor and packaged like candy. Mouth, hands, and eyesight were tested at identifying specific structures. Students recognized structures by mouth at 85.59% accuracy, similar to recognition by eyesight using computer animation. Recall accuracy of structures was higher by mouth than hand for 40.91% of students, equal for 31.82%, and lower for 27.27%. The convenient use of entire packs of tiny, cheap, portable models can make 3D imagery more accessible to students.

scholarly journals Trading Global Catastrophes: NATO’s Science Diplomacy and Nuclear Winter

2021 ◽  
pp. 002200942199391
Author(s):  
Simone Turchetti
Keyword(s):  
North Atlantic ◽  
North Atlantic Treaty Organization ◽  
Environmental Consequences ◽  
The North ◽  
The Earth ◽  
Science Diplomacy ◽  
The North Atlantic ◽  
Nuclear Winter ◽  
Scientific Debates ◽  
Public Criticism

This essay explores the reception of ‘nuclear winter’ at the North Atlantic Treaty Organization (NATO). This response is paradigmatic of how scientific predictions can work as stimuli for science diplomacy activities, and either inflate or deflate these forecasts’ public resonance. Those who elaborated the theory in the early 1980s predicted that the environmental consequences of a future nuclear conflict would have been catastrophic; possibly rendering the earth uninhabitable and leading to the extinction of humankind. This prospect was particularly problematic for the Western defence alliance, since it was difficult to reconcile with the tenets of its nuclear posture, especially after the 1979 Dual Track decision, engendering concerns about the environmental catastrophe that the scientists predicted. Thus, NATO officials refrained from commenting on nuclear winter and its implications for the alliance’s deterrence doctrine for some time in an effort to minimize public criticism. Meanwhile, they progressively removed research on nuclear winter from the set of studies and scientific debates sponsored by NATO in the context of its science initiatives. In essence, NATO officials ‘traded’ the promotion of these problematic studies with that of others more amenable to the alliance’s diplomacy ambitions.

scholarly journals Structured-light 3D scanning of exhibited historical clothing—a first-ever methodical trial and its results

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Jerzy Montusiewicz ◽  
Marek Miłosz ◽  
Jacek Kęsik ◽  
Kamil Żyła
Keyword(s):  
Cultural Heritage ◽  
Information Technologies ◽  
Structured Light ◽  
Three Dimensional ◽  
3D Models ◽  
3D Scanning ◽  
Dimensional Representation ◽  
3D Scanner ◽  
Three Dimensional Representation ◽  
3D Scanners

AbstractHistorical costumes are part of cultural heritage. Unlike architectural monuments, they are very fragile, which exacerbates the problems of their protection and popularisation. A big help in this can be the digitisation of their appearance, preferably using modern techniques of three-dimensional representation (3D). The article presents the results of the search for examples and methodologies of implementing 3D scanning of exhibited historical clothes as well as the attendant problems. From a review of scientific literature it turns out that so far practically no one in the world has made any methodical attempts at scanning historical clothes using structured-light 3D scanners (SLS) and developing an appropriate methodology. The vast majority of methods for creating 3D models of clothes used photogrammetry and 3D modelling software. Therefore, an innovative approach was proposed to the problem of creating 3D models of exhibited historical clothes through their digitalisation by means of a 3D scanner using structural light technology. A proposal for the methodology of this process and concrete examples of its implementation and results are presented. The problems related to the scanning of 3D historical clothes are also described, as well as a proposal how to solve them or minimise their impact. The implementation of the methodology is presented on the example of scanning elements of the Emir of Bukhara's costume (Uzbekistan) from the end of the nineteenth century, consisting of the gown, turban and shoes. Moreover, the way of using 3D models and information technologies to popularise cultural heritage in the space of digital resources is also discussed.

scholarly journals Comparative Analysis of Digital Models of Objects of Cultural Heritage Obtained by the “3D SLS” and “SfM” Methods

2021 ◽  
Vol 11 (12) ◽  
pp. 5321
Author(s):  
Marcin Barszcz ◽  
Jerzy Montusiewicz ◽  
Magdalena Paśnikowska-Łukaszuk ◽  
Anna Sałamacha
Keyword(s):  
Cultural Heritage ◽  
Low Cost ◽  
Three Dimensional ◽  
3D Models ◽  
Silk Road ◽  
Digital Models ◽  
Global Pandemic ◽  
University Of Technology ◽  
Three Dimensional Models ◽  
3D Digitisation

In the era of the global pandemic caused by the COVID-19 virus, 3D digitisation of selected museum artefacts is becoming more and more frequent practice, but the vast majority is performed by specialised teams. The paper presents the results of comparative studies of 3D digital models of the same museum artefacts from the Silk Road area generated by two completely different technologies: Structure from Motion (SfM)—a method belonging to the so-called low-cost technologies—and by Structured-light 3D Scanning (3D SLS). Moreover, procedural differences in data acquisition and their processing to generate three-dimensional models are presented. Models built using a point cloud were created from data collected in the Afrasiyab museum in Samarkand (Uzbekistan) during “The 1st Scientific Expedition of the Lublin University of Technology to Central Asia” in 2017. Photos for creating 3D models in SfM technology were taken during a virtual expedition carried out under the “3D Digital Silk Road” program in 2021. The obtained results show that the quality of the 3D models generated with SfM differs from the models from the technology (3D SLS), but they may be placed in the galleries of the vitrual museum. The obtained models from SfM do not have information about their size, which means that they are not fully suitable for archiving purposes of cultural heritage, unlike the models from SLS.

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