scholarly journals UNIGRAPHICS ATUOMATED DEFINITION OF MINIMAL DIMENSIONS OF 3D MODELS IN THE ‘UNIGRAPHICS’ CAD-TYPE SOFTWARE

2010 ◽  
Vol 1 (2) ◽  
pp. 34-38
Author(s):  
Vladimir A. Tikhomirov ◽  
◽  
Denis F. Kutuzov ◽  
Keyword(s):  
3D Models ◽  
Definition Of

BIM Application in Documenting and Recreating Lost Architectural Heritage

2019 ◽  
pp. 112-141
Author(s):  
Paola Casu ◽  
Claudia Pisu
Keyword(s):  
Nineteenth Century ◽  
Cultural Heritage ◽  
3D Models ◽  
Full Potential ◽  
Architectural Heritage ◽  
Research Focus ◽  
Digital Archiving ◽  
Food Market ◽  
Definition Of

The digital archiving process of complex historical architectural 3D models is a key point in the field of tangible cultural heritage. A lot of research focus on the definition of methodologies and tools that exploit the full potential of ICT applied to the documentation of cultural heritage. This chapter illustrates a part of a study in this line of investigation. It focuses on the use of BIM for the reconstruction of lost architectural heritage. BIM will be applied to virtual reconstruct the nineteenth-century covered food market of Cagliari that was demolished in 1957. Thanks to the properties of BIM to enter information related to each element constituting a building, every part of the model will be accompanied by information on the degree of reliability and references adopted for its creation. In this way, each family of elements could more easily and knowingly be reused for other similar projects.

scholarly journals Development of a method for improving the accuracy of measurement of linear measures of 3D models via scanning

2021 ◽  
Vol 6 (2(62)) ◽  
pp. 30-36
Author(s):  
Volodymyr Kvasnikov ◽  
Dmytro Ornatskyi ◽  
Valerii Dostavalov
Keyword(s):  
3D Model ◽  
3D Models ◽  
Poor Quality ◽  
Advanced Technology ◽  
Combined Method ◽  
Linear Dimensions ◽  
Photogrammetric Method ◽  
Real Size ◽  
Definition Of

The object of research is to refine the linear sizes of the obtained 3D models via scanning, and reducing the numbers of errors when obtaining the model. For now, there is no accuracy method for transferring the actual sizes of an object to a 3D model. One of the most problematic places in the existing methods of transferring sizes from the object to the model is the error in the placement of dimensional markers due to inaccuracy, or poor quality of the received surface via scanning. A model of the instrument complex is used to implement an improved method of 3D scanning, based on the photogrammetric method. The advanced technology of construction and measurement of 3D models on the basis of photos on the principle of stereo pairs in combination with image projection is based on a combination of existing scanning methods. As well as the introduction of new functionalities, such as maintaining the actual sizes of an object, its textures, color and light characteristics, as well as improving the accuracy of linear sizes. As a result of the use of a standard, reference projections, and a new method of comparing photographs to build a 3D model, a 60 % increase in the accuracy of linear dimensions was achieved. This is due to the fact that the proposed new combined method incorporates all the existing most important aspects of scanning. And also has a number of features, such as the definition of boundary surfaces, automatic sizing, detection, and processing of glass and mirror surfaces. Due to this, this method eliminates the main disadvantages of the usual photogrammetric method – inaccuracies in the surface quality of the models, and inaccuracies in the transfer of linear dimensions. It is estimated that the combined method will allow to transfer the real size of simple objects in 3D with an accuracy of 99.97 % of the actual size of the object. It will also improve the quality of complex surfaces (boundary, glass, mirror) by at least 40–60 %, compared to other existing methods.

scholarly journals Capiteles sevillanos. Técnicas avanzadas para su documentación gráfica

2015 ◽  
Vol 4 (8) ◽  
pp. 117 ◽  
Author(s):  
B. Molero Alonso ◽  
J.A. Barrera Vera ◽  
E. Cabrera Revuelta
Keyword(s):  
Graphic Design ◽  
New Technologies ◽  
Point Clouds ◽  
3D Models ◽  
Software Management ◽  
Optical Scanners ◽  
Architectural Elements ◽  
Recent Developments ◽  
Design Software ◽  
Definition Of

<p>Recent developments in the field of documentation of cultural heritage using digital photogrammetry and scanning have led to a renewed interest in techniques and processes that are being used to get geometric models of heritage. So far, however, there has been little discussion about the definition of standardized processes in order to ensure homogeneity and interoperability.<br />On the other hand, very valuable information of the buildings is contained by capitals. The aim of our research is to get a protocol in the documentation of this kind of architectural elements, through the use and comparison of new technologies in the graphic documentation. For this purpose, we have used photogrammetric techniques and optical scanners in order to obtain field data, specialized software management and modeling point clouds for the development of textured 3D models and graphic design software that allows us to analyze and disseminate the results.</p>

scholarly journals METHODS FOR MODELS PARAMETERS ESTIMATE TO SOLVE PROBLEMS ON 3D RECONSTRUCTION OF REAL OBJECTS COMPLEX MODELS

2016 ◽  
Vol 2016 (3) ◽  
pp. 233-242 ◽  
Author(s):  
Владислав Колякин ◽  
Vladislav Kolyakin ◽  
Владимир Аверченков ◽  
Vladimir Averchenkov ◽  
Максим Терехов ◽  
...  
Keyword(s):  
Computer Games ◽  
Three Dimensional ◽  
3D Models ◽  
Model Parameters ◽  
Complex Objects ◽  
Image Brightness ◽  
Real Objects ◽  
Complex Models ◽  
Three Dimensional Models ◽  
Definition Of

Virtual threedimensional (3 D) models of complex objects are used in many fields of science and engineering, such as architecture, industry, medicine, robotics. Besides, 3D models are used in geoinformation systems, computer games, virtual and supplemented reality and so on. Three dimensional models can be formed in dif-ferent ways, one of which consists in 3 D reconstruc-tion. One of the stages of the 3 D reconstruction of complex models of real objects is a definition of the mathematical models of geometric primitives emphasized on the image. One of the ways for the estimate of model parameters is a method of Hough vote and its modifications – Hough probabilistic transformation, Hough random transformation, Hough hierarchical transformation, phase space blurriness, use of a gra-dient of image brightness and so on. As an alternative way for models selection is a choice of suitable points from a set of data.

scholarly journals Referent geometric entities in orthodontics on 3D models

2014 ◽  
Vol 61 (2) ◽  
pp. 102-112
Author(s):  
Nemanja Majstorovic ◽  
Jelena Macuzic ◽  
Branislav Glisic
Keyword(s):  
Plane Curve ◽  
3D Models ◽  
Anatomical Features ◽  
Cad System ◽  
Straight Line ◽  
Coordinate Origin ◽  
Set Up ◽  
Definition Of ◽  
Point Line ◽  
Engineering Modeling

3D modeling is often used in orthodontics. Most commonly used software today is problem- oriented CAD system (OrthoCAD and others), as well as general CAD software for engineering modeling. Both methods require definition and use of various geometric entities to describe and monitor orthodontic status, but still there have been more than one approach to definition of geometric entities that characterize orthodontic parameters. The aim of this study was to define the referent geometric entities (RGE) on 3D models, perform their classification and provide examples of their application. For defining and monitoring orthodontic parameters the following RGE groups are used: (a) basic geometric entities (point, line, straight line, plane, curve, curved surface); (b) derived geometric entities (coordinate origin, coordinate system, coordinate plane, axis, edge, perspective); and (c) anatomical geometric entities (surfaces, points). In this study, using 11 examples is shown how orthodontic parameters can be modeled over three classification groups RGE. Presented analysis and RGE examples indicate that RGE give interdisciplinary and systematic approach to computer modeling in orthodontics, and create a basis for development and implementation of methods of anatomical features in orthodontics which can be used to set up an integrated orthodontic parameter.

scholarly journals The reconstruction of drawn architecture

2017 ◽  
Vol 1 (2) ◽  
pp. 380-395 ◽  
Author(s):  
Fabrizio Ivan Apollonio ◽  
Federico Fallavollita ◽  
Elisabetta Caterina Giovannini ◽  
Riccardo Foschi ◽  
Salvatore Corso
Keyword(s):  
3D Reconstruction ◽  
Manufacturing Systems ◽  
3D Models ◽  
Reconstruction Process ◽  
Documentary Sources ◽  
Reconstructive Process ◽  
Physical Form ◽  
The Many ◽  
Definition Of ◽  
Object Of Study

Among the many cases concerning the process of digital hypothetical 3D reconstruction a particular case is constituted by never realized projects and plans. They constitute projects designed and remained on paper that, albeit documented by technical drawings, they pose the typical problems that are common to all other cases. From 3D reconstructions of transformed architectures, to destroyed/lost buildings and part of towns.This case studies start from original old drawings which has to be implemented by different kind of documentary sources, able to provide - by means evidence, induction, deduction, analogy - information characterized by different level of uncertainty and related to different level of accuracy.All methods adopted in a digital hypothetical 3D reconstruction process show us that the goal of all researchers is to be able to make explicit, or at least intelligible, through a graphical system a synthetic/communicative level representative or the value of the reconstructive process that is behind a particular result.The result of a reconstructive process acts in the definition of three areas intimately related one each other which concur to define the digital consistency of the artifact object of study: Shape (geometry, size, spatial position); Appearance (surface features); Constitutive elements (physical form, stratification of building/manufacturing systems)The paper, within a general framework aimed to use 3D models as a means to document and communicate the shape and appearance of never built architecture, as well as to depict temporal correspondence and allow the traceability of uncertainty and accuracy that characterizes each reconstructed element.  

scholarly journals THE SURVEY OF CULTURAL HERITAGE AFTER AN EARTHQUAKE: THE CASE OF EMILIA–LOMBARDIA IN 2012

2016 ◽  
Vol XLI-B5 ◽  
pp. 161-168 ◽  
Author(s):  
A. Adami ◽  
S. Chiarini ◽  
S. Cremonesi ◽  
L. Fregonese ◽  
L. Taffurelli ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
Point Cloud ◽  
Three Dimensional ◽  
3D Models ◽  
Civil Protection ◽  
Damage Survey ◽  
Second Stage ◽  
Economic Decisions ◽  
Definition Of ◽  
Survey Approach

In recent years many earthquakes hit Italy and its Cultural Heritage. The topic of survey of buildings damaged by seismic events and their interpretation has become very relevant and involved many research groups and Italian Civil Protection. &lt;br&gt;&lt;br&gt; The damage survey has different roles: in the first stage, immediately after the emergency, the documentation is necessary for the shoring and protection of damaged structures (AEDES forms of Civil Protection). The aim of the second stage is the study and the documentation for the restoration, reconstruction and retrofitting of buildings. &lt;br&gt;&lt;br&gt; In this context, this study presents methods and instruments used in the survey of 24 churches in the province of Mantua, Lombardy, after the 2012 earthquake sequence. The paper examines the difficulties in surveying damaged buildings and presents the classification used to define, time by time, the most suitable survey approach in the field of Geomatics. In this classification, many aspects are taken into account, such as logistical and practical problems, safety conditions, time preserving methods, economic decisions, complexity of building and required results. &lt;br&gt;&lt;br&gt; The accurate documentation obtained as a three-dimensional architectural database allows for the observation and analysis of the damage, the definition of interpretative models and the development of intervention projects. Different results are obtained from the point cloud database: traditional 2D representations for architectural projects as well as 3D models for structural analysis or for the development of BIM.

scholarly journals Fuentes de color mejoradas para el modelado tridimensional de artefactos arqueológicos de tamaño medio localizados in situ.

2014 ◽  
Vol 5 (10) ◽  
pp. 59 ◽  
Author(s):  
Fabrizio I. Apollonio ◽  
Massimo Ballabeni ◽  
Marco Gaiani
Keyword(s):  
Processing System ◽  
3D Models ◽  
Archaeological Artifacts ◽  
Definition Of

The paper describes a color enhanced processing system - applied as case study on an artifact of the Pompeii archaeological area - developed in order to enhance different techniques for reality-based 3D models construction and visualization of archaeological artifacts. This processing allows rendering reflectance properties with perceptual fidelity on a consumer display and presents two main improvements over existing techniques: a. the color definition of the archaeological artifacts; b. the comparison between the range-based and photogrammetry-based pipelines to understand the limits of use and suitability to specific objects.

B.I.M. Application in Documenting and Recreating Lost Architectural Heritage

2016 ◽  
pp. 144-173 ◽  
Author(s):  
Paola Casu ◽  
Claudia Pisu
Keyword(s):  
Nineteenth Century ◽  
Cultural Heritage ◽  
3D Models ◽  
Full Potential ◽  
Architectural Heritage ◽  
Research Focus ◽  
Digital Archiving ◽  
Food Market ◽  
Definition Of

The digital archiving process of complex historical architectural 3D models is a key point in the field of tangible cultural heritage. A lot of research focus on the definition of methodologies and tools that exploit the full potential of ICT applied to the documentation of cultural heritage. This chapter illustrates a part of a study in this line of investigation. It focuses on the use of BIM for the reconstruction of lost architectural heritage. BIM will be applied to virtual reconstruct the nineteenth-century covered food market of Cagliari that was demolished in 1957. Thanks to the properties of BIM to enter information related to each element constituting a building, every part of the model will be accompanied by information on the degree of reliability and references adopted for its creation. In this way, each family of elements could more easily and knowingly be reused for other similar projects.

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