scholarly journals A Multidisciplinary Approach for Historic Buildings Diagnosis: The Case Study of the Kaisariani Monastery

Heritage ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 1211-1232 ◽  
Author(s):  
Ekaterini T. Delegou ◽  
Georgia Mourgi ◽  
Elisavet Tsilimantou ◽  
Charalabos Ioannidis ◽  
Antonia Moropoulou
Keyword(s):  
Computer Aided Design ◽  
Building Materials ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Diagnostic Study ◽  
Thematic Maps ◽  
Architectural Drawings ◽  
The Creation ◽  
Ground Penetrating ◽  
Sustainable Protection

In this work, a multi-disciplinary approach regarding diagnostic study processes is presented, using as an example the Catholicon of Kaisariani Monastery in Attica, Greece. Kaisariani Monastery is considered one of the most important Byzantine architectural complexes in Greece. The Catholicon of Kaisariani Monastery was built during the middle Byzantine period, and has undergone many reconstructions during the centuries. It is a semi-complex, four-columned, cross-in-square church, with a cloisonné masonry. The suggested diagnostic processes included the creation of multidisciplinary thematic maps in Computer Aided Design (CAD) environment, which incorporated: (a) data of historical and architectural documentation; (b) data of geometric documentation; and (c) data of building materials characterization and decay diagnosis. The historical and general architectural data were acquired by thorough bibliographical/archival research. Geometric documentation data were acquired by three-dimensional (3D) laser scanner for the creation of the Catholicon section drawings, whereas image based photogrammetric techniques were utilized for the creation of a 3D textured model, from which orthoimages and architectural drawings of the Catholicon façades were developed. In parallel, characterization of building materials and identification of decay patterns took place after the onsite application of the nondestructive techniques of digital microscopy, infrared thermography and ground penetrating radar. These vast array kinds of data were elaborated and integrated into the architectural drawings, developing thematic maps that record and represent the current preservation state of the monument, a concerning major construction phases, the most important conservation intervention projects, building materials and decay. Furthermore, data quantification regarding the extent of building materials and decay at each monument’s façade took place. Therefore, correlation and better understanding of the environmental impact on building materials according to façade orientation and historical data, e.g., construction phases, was accomplished. In conclusion, the presented processes are multidisciplinary tasks that require collaboration among architects, surveyor engineers and materials scientists/engineers. They are also prerequisites for the planning and application of compatible and efficient conservation/restoration interventions, for the ultimate goal of the sustainable protection of a monument.

Stereolithographic Additive Manufacturing of Bulky Ceramic Components with Functionally Geometric Micropattern

2016 ◽  
Vol 2016 (CICMT) ◽  
pp. 000001-000005
Author(s):  
Soshu Kirihara
Keyword(s):  
Additive Manufacturing ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Porous Electrodes ◽  
Beam Diameter ◽  
Cross Sectional ◽  
Geometric Patterns ◽  
Artificial Bones ◽  
Cad Cam

Abstract In a stereolithographic additive manufacturing (AM), two dimensional (2D) cross sectional patterns were created through photo polymerization by ultraviolet laser drawing on spread resin paste including ceramic nanoparticles, and three dimensional (3D) composite models were sterically printed by layer lamination through chemical bonding. An automatic collimeter was equipped with the laser scanner to adjust beam diameter. Fine or coarse beams could realize high resolution or wide area drawings, respectively. Metal and ceramic bulky components including dendritic networks were geometrically built by using stereolithographic AM. Geometric patterns with periodic, self-similar, graded and fluctuated arrangements were created by computer aided design, manufacture and evaluation (CAD/CAM/CAE) for effective modulations of energy and material flows through dielectric lattices in photonic crystals, porous electrodes in fuel cells and biological scaffolds in artificial bones.

An interactive, visual approach to developing and applying parametric three-dimensional spatial grammars

2011 ◽  
Vol 25 (4) ◽  
pp. 333-356 ◽  
Author(s):  
Frank Hoisl ◽  
Kristina Shea
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Visual Development ◽  
General Level ◽  
Design Environment ◽  
Prototype Implementation ◽  
Left Hand ◽  
Spatial Grammar ◽  
The Creation ◽  
Definition Of

AbstractSpatial grammars are rule based, generative systems for the specification of formal languages. Set and shape grammar formulations of spatial grammars enable the definition of spatial design languages and the creation of alternative designs. Since the introduction of the underlying formalism, they have been successfully applied to different domains including visual arts, architecture, and engineering. Although many spatial grammars exist on paper, only a few, limited spatial grammar systems have been computationally implemented to date; this is especially true for three-dimensional (3-D) systems. Most spatial grammars are hard-coded, that is, once implemented, the vocabulary and rules cannot be changed without reprogramming. This article presents a new approach and prototype implementation for a 3-D spatial grammar interpreter that enables interactive, visual development and application of grammar rules. The method is based on a set grammar that uses a set of parameterized primitives and includes the definition of nonparametric and parametric rules, as well as their automatic application. A method for the automatic matching of the left hand side of a rule in a current working shape, including defining parametric relations, is outlined. A prototype implementation is presented and used to illustrate the approach through three examples: the “kindergarten grammar,” vehicle wheel rims, and cylinder cooling fins. This approach puts the creation and use of 3-D spatial grammars on a more general level and supports designers with facilitated definition and application of their own rules in a familiar computer-aided design environment without requiring programming.

scholarly journals Hybrid approach for alignment of a pre-processed three-dimensional point cloud, video, and CAD model using partial point cloud in retrofitting applications

2018 ◽  
Vol 14 (3) ◽  
pp. 155014771876645 ◽  
Author(s):  
Ashok Kumar Patil ◽  
G Ajay Kumar ◽  
Tae-Hyoung Kim ◽  
Young Ho Chai
Keyword(s):  
Computer Aided Design ◽  
Point Cloud ◽  
Hybrid Approach ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Point Cloud Data ◽  
Cloud Data ◽  
Video Scene ◽  
Engineering Models ◽  
Aided Design

Acquiring the three-dimensional point cloud data of a scene using a laser scanner and the alignment of the point cloud data within a real-time video environment view of a camera is a very new concept and is an efficient method for constructing, monitoring, and retrofitting complex engineering models in heavy industrial plants. This article presents a novel prototype framework for virtual retrofitting applications. The workflow includes an efficient 4-in-1 alignment, beginning with the coordination of pre-processed three-dimensional point cloud data using a partial point cloud from LiDAR and alignment of the pre-processed point cloud within the video scene using a frame-by-frame registering method. Finally, the proposed approach can be utilized in pre-retrofitting applications by pre-generated three-dimensional computer-aided design models virtually retrofitted with the help of a synchronized point cloud, and a video scene is efficiently visualized using a wearable virtual reality device. The prototype method is demonstrated in a real-world setting, using the partial point cloud from LiDAR, pre-processed point cloud data, and video from a two-dimensional camera.

scholarly journals Application of process mapping for digitization of mechanical parts with 3D laser scanner

2018 ◽  
Vol 9 ◽  
pp. 11 ◽  
Author(s):  
Antonio Piratelli-Filho ◽  
Alberto José Alvares ◽  
Rosenda Valdés Arencibia
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Mapping Method ◽  
Free Form ◽  
Process Mapping ◽  
Mechanical Parts ◽  
Cad Models ◽  
Measurement Planning ◽  
Aided Design

This work presents a systematization method for digitization of mechanical parts with three-dimensional (3D) laser scanner using the process mapping method. The application involves the use of the IDEFØ methodology of process mapping to address the sequence of steps required to obtain the computer-aided design (CAD) model of the measured part. The variables involved in the setup and measurement with 3D laser scanner were investigated and applied to regular and free-form parts, and the parameter geometry, texture, light reflection and procedure of data acquisition were considered in the analysis. The software commands used to create the CAD models were also included and the ones related to mesh and surface creation were detailed. The systematized measurement planning was graphi graphically presented, and it proved useful to operators during the digitization process.

scholarly journals Drawing in Perspective: A Proposition for a Discursive Architecture in the Age of Digital Representation

2021 ◽  
Author(s):  
◽  
Laura Coates
Keyword(s):  
Computer Aided Design ◽  
Ground Plane ◽  
Three Dimensional ◽  
Picture Plane ◽  
Linear Perspective ◽  
Architectural Drawings ◽  
Digital Representation ◽  
Architectural Drawing ◽  
Architectural Representation ◽  
The Relationship

<p>Contemporary architectural practise has come to depend upon digital representation as a means of design and for the production of architectural drawings. The computer is common place in architectural offices, relegating the drawing board as a machine of the past. Today, the architect is more likely to draw with a mouse than a mechanical pencil. The proposition of this research suggests such a dramatic shift within representational technology will not only affect how architects design, but also, what they design. Digital modes of architectural representation are reliant on mathematical code designed to artificially simulate visual experience. Such software offers strict alliance with a geometrically correct perspective code making the construction of perspective as simple as taking a ‘snap shot’. The compliance of the digital drawing to codes prescribed by a programmer distance the architect from the perspectival representation, consequently removing the architect’s control of the drawing convention. The universality of perspectival views is enforced by computer programmes such as Google Sketch-Up, which use perspective as a default view. This research explores the bias of linear perspective, revealing that which architects have forgotten due to a dependence on digital software. Special attention is drawn to the lack of control the architect exerts over their limits of representation. By using manual drawing the perspective convention is able to be unpacked and critiqued against the limitations of the system first prescribed by Brunelleschi. The manual drawing is positioned as a powerful mode of representation for it overtly expresses projection and the architect’s control of the line. The hand drawing allows the convention to be interpreted erroneously. The research is methodology driven, focusing on representation as more than a rudimentary tool, but a component of the design process. Thus, representational tools are used to provide a new spatial representation of a site. Computer aided design entered wide spread architectural practice at the end of the 1980’s, a decade that provided an ideal setting for speculative drawn projects. Such projects proved fruitful to architects critically approaching issues of representation and drawing convention, treating the drawing as more than utilitarian in the production of architecture. Whilst the move into digital imagining is not a paradigm shift for the act of drawing, it fundamentally shifted the way architects draw, separating drawing conventions onto visually separate ‘sheets’. The architectural drawing known today was that discovered in the Renaissance, Renaissance architects, the first to conceive of architecture through representation, thus was their endeavour to produce a true three dimensional image. The Renaissance architect executed absolute control of perspective, control, which has since defined the modern architect. Positioned within research by design, the ‘drawing-out’ process is a critical interpretation of perspective. In particular the drawing of instrumental perspective is unpacked within the realm of scientific research. The picture plane, horizon line and ground plane remain constant as the positions of these are well documented. The stationary point, vanishing point (possibly the most speculative components of the drawing) or the relationship between the two, behave as independent variables. In breaking the assumptions that underlie linear perspective as a fixed geometric system we may ask ourselves if we are in control of representational methods, or if they control us. Since architects are controlled by their means of representation this question is paramount to the discipline, particularly today, when digital drawing has shifted the relationship between architect and representation. The implications of this new relationship may result in monotony across the architectural disciple, where the production of critical architecture is secondary to computer technology.</p>

scholarly journals FROM SURVEY TO MODEL, AND RETURN. THE CASE OF THE PARMA BAPTISTERY

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 801-808
Author(s):  
A. Zerbi ◽  
S. Mikolajewska
Keyword(s):  
3D Model ◽  
Three Dimensional ◽  
Laser Scanner ◽  
3D Models ◽  
Special Focus ◽  
Monumental Architecture ◽  
Survey Techniques ◽  
Levels Of Detail ◽  
Three Dimensional Representation ◽  
The Creation

<p><strong>Abstract.</strong> Although this is not always the common practice, the survey should be an essential preliminary stage to any operation of restoration, enhancement and promotion of cultural heritage. Today, various surveying techniques make it possible to collect large amounts of data quickly and to provide a complete three-dimensional representation of extremely complex artefacts. In fact, 3D models allow a much richer description than traditional 2D representations. However, these survey techniques (laser scanner and photogrammetry above all) necessarily imply that the data that must be elaborated during the processing phase increase dramatically. It is therefore essential to identify methods and workflows that allow to find a compromise between the richness and completeness of the survey data and the problems inherent in the costs and times of execution of the modelling operations. The problem is further heightened by the fact that the importance of historical monumental architecture inevitably requires the use of different techniques integrated with each other, the production of documentation at different scales with different levels of detail and the creation of a 3D model that has the ability to be used for different purposes. This paper describes the survey of one of the most important medieval monuments in northern Italy, the Parma Baptistery, with a special focus on the phase of data restitution. The integrated survey campaigns conducted in recent years have aimed to describe the building in its totality: from the scale of the architecture to the detail, passing through the description of the pictorial cycle that characterizes the interior. This case study represents a moment of reflection, at least for those who wrote it, on the validity of the methods and techniques to be used for the creation of a complete 3D model of a complex historical monument.</p>

scholarly journals Drawing in Perspective: A Proposition for a Discursive Architecture in the Age of Digital Representation

2021 ◽  
Author(s):  
◽  
Laura Coates
Keyword(s):  
Computer Aided Design ◽  
Ground Plane ◽  
Three Dimensional ◽  
Picture Plane ◽  
Linear Perspective ◽  
Architectural Drawings ◽  
Digital Representation ◽  
Architectural Drawing ◽  
Architectural Representation ◽  
The Relationship

<p>Contemporary architectural practise has come to depend upon digital representation as a means of design and for the production of architectural drawings. The computer is common place in architectural offices, relegating the drawing board as a machine of the past. Today, the architect is more likely to draw with a mouse than a mechanical pencil. The proposition of this research suggests such a dramatic shift within representational technology will not only affect how architects design, but also, what they design. Digital modes of architectural representation are reliant on mathematical code designed to artificially simulate visual experience. Such software offers strict alliance with a geometrically correct perspective code making the construction of perspective as simple as taking a ‘snap shot’. The compliance of the digital drawing to codes prescribed by a programmer distance the architect from the perspectival representation, consequently removing the architect’s control of the drawing convention. The universality of perspectival views is enforced by computer programmes such as Google Sketch-Up, which use perspective as a default view. This research explores the bias of linear perspective, revealing that which architects have forgotten due to a dependence on digital software. Special attention is drawn to the lack of control the architect exerts over their limits of representation. By using manual drawing the perspective convention is able to be unpacked and critiqued against the limitations of the system first prescribed by Brunelleschi. The manual drawing is positioned as a powerful mode of representation for it overtly expresses projection and the architect’s control of the line. The hand drawing allows the convention to be interpreted erroneously. The research is methodology driven, focusing on representation as more than a rudimentary tool, but a component of the design process. Thus, representational tools are used to provide a new spatial representation of a site. Computer aided design entered wide spread architectural practice at the end of the 1980’s, a decade that provided an ideal setting for speculative drawn projects. Such projects proved fruitful to architects critically approaching issues of representation and drawing convention, treating the drawing as more than utilitarian in the production of architecture. Whilst the move into digital imagining is not a paradigm shift for the act of drawing, it fundamentally shifted the way architects draw, separating drawing conventions onto visually separate ‘sheets’. The architectural drawing known today was that discovered in the Renaissance, Renaissance architects, the first to conceive of architecture through representation, thus was their endeavour to produce a true three dimensional image. The Renaissance architect executed absolute control of perspective, control, which has since defined the modern architect. Positioned within research by design, the ‘drawing-out’ process is a critical interpretation of perspective. In particular the drawing of instrumental perspective is unpacked within the realm of scientific research. The picture plane, horizon line and ground plane remain constant as the positions of these are well documented. The stationary point, vanishing point (possibly the most speculative components of the drawing) or the relationship between the two, behave as independent variables. In breaking the assumptions that underlie linear perspective as a fixed geometric system we may ask ourselves if we are in control of representational methods, or if they control us. Since architects are controlled by their means of representation this question is paramount to the discipline, particularly today, when digital drawing has shifted the relationship between architect and representation. The implications of this new relationship may result in monotony across the architectural disciple, where the production of critical architecture is secondary to computer technology.</p>

scholarly journals Three-dimensional imaging from laser scanner, photogrammetric and acoustic non-destructive techniques in the characterization of stone building materials

2018 ◽  
Vol 45 ◽  
pp. 57-62 ◽  
Author(s):  
Maria Giovanna Bianchi ◽  
Giuseppe Casula ◽  
Francesco Cuccuru ◽  
Silvana Fais ◽  
Paola Ligas ◽  
...  
Keyword(s):  
High Resolution ◽  
Building Materials ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Building Stone ◽  
Data Sets ◽  
Ultrasonic Tomography ◽  
Three Dimensional Imaging ◽  
Stone Materials ◽  
D Model

Abstract. When combined, the three-dimensional imaging of different physical properties of architectural monumental structures acquired through different methodologies can highlight with efficiency the characteristics of the stone building materials. In this work, we compound high resolution Digital Color Images (DCI) and Terrestrial Laser Scanner (TLS) data for a dense 3-D reconstruction of an ancient pillar in a nineteenth century building in the town of Cagliari, Italy. The TLS technique was supported by a digital photogrammetry survey in order to obtain a natural color texturized 3-D model of the studied pillar. Geometrical anomaly maps showing interesting analogies were computed both from the 3-D model derived from the TLS application and from the high resolution 3-D model detected with the photogrammetry. Starting from the 3-D reconstruction from previous techniques, an acoustic tomography in a sector of prior interest of the investigated architectural element was planned and carried out. The ultrasonic tomography proved to be an effective tool for detecting internal decay or defects, locating the position of the anomalies and estimating their sizes, shapes, and characteristics in terms of elastic-mechanical properties. Finally, the combination of geophysical and petrographical data sets represents a powerful method for understanding the quality of the building stone materials in the shallow and inner parts of the investigated architectural structures.

Complex Shape Measurement Using 3D Scanner

2012 ◽  
Author(s):  
Rahmita Wirza O.K. Rahmat ◽  
Seng Beng Ng ◽  
Kamini Sangaralingam
Keyword(s):  
Computer Aided Design ◽  
Complex Shape ◽  
Knee Prosthesis ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Raw Material ◽  
Surface Model ◽  
Automated Inspection ◽  
3D Scanner ◽  
Inspection Systems

Sistem Pemeriksaan Automatik biasanya bermula dengan teknik Reka bentuk Berbantukan Komputer (CAD) dan berakhir dengan janaan arahan mesin untuk menukarkan bahan mentah kepada produk akhir, memperolehi data tiga dimensi untuk membina model permukaan berparameter bagi tujuan analisis ralat, duplikasi atau memperbaiki objek tersebut. Ia melibatkan pendigitalan permukaan objek yang perlu diperiksa, janaan model CAD dan analisis keputusan pemeriksaan. Pendigitalan boleh dilakukan dengan teknik kuar sentuh atau pengesan tanpa sentuh. Biasanya, tanpa bantuan daripada pengeluar, adalah sukar untuk memantau dan mengenal pasti perubahan produk selepas digunakan. Tambahan pula, reka bentuk cetakan asal tidak didedahkan. Objektif utama kertas ini ialah mencadangkan suatu algoritma yang mampu mengekstrak maklumat daripada objek berbentuk kompleks yang telah didigitalkan (dengan menggunakan pengimbas laser), misalnya cangkukan lutut, untuk menjanakan reka bentuk cetakannya. Diharapkan penyelidik lain, terutamanya dalam bidang perubatan dan bio-kejuruteraan mendapat manfaat daripada algoritma ini untuk meramal dan menganggar perubahan bekas cangkukan perubatan dan seterusnya mengubah reka bentuknya untuk memenuhi kehendak pesakit. Kata kunci: Pemeriksaan automatik, reka bentuk cetakan, cangkukan lutut, pengimbas 3D, gantian lutut total Automated inspection systems usually start from computer-aided design (CAD) techniques, and end with either generation of machining instructions required to convert a raw material into a finished product, or to obtain three-dimensional data for constructing a parametric surface model of the product for the purpose of error analysis, or to duplicate or enhance the object. It involves surface digitization of an existing part that needs inspection, CAD model creation and analyzing the inspection results. Most of the time, without the help from the manufacturer, it is very difficult to do inspection and to detect any changes of the product after being used. In addition, the original blueprints of most manufacturing products are not being revealed to the public. The main objective of this paper is to propose an algorithm that is able to extract information from digitized complex shape objects (using laser scanner), such as the medical knee implant (knee prosthesis), to generate their blueprint. It is hoped that other researchers, especially in the medical and bioengineering field, can benefit from this proposed algorithm to predict or approximate the changes of the medical ex-plant and modify its design to suit the patient needs. Key words: Automated inspection, blueprint, prosthesis, 3D scanner, total knee replacement

scholarly journals Reverse modeling of the human mandible 3D geometric model

2020 ◽  
Vol 77 (3) ◽  
pp. 262-270
Author(s):  
Jelena Mitic ◽  
Nikola Vitkovic ◽  
Miodrag Manic ◽  
Miroslav Trajanovic ◽  
Sladjana Petrovic ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Geometric Model ◽  
Three Dimensional ◽  
Bone Geometry ◽  
Geometrical Model ◽  
The Body ◽  
Surface Model ◽  
Anatomical Landmarks ◽  
The Creation ◽  
Polygonal Model

Background/Aim. The geometry of each bone in the human skeletal system is unique. The aim of this research was to present application of a new method, method of anatomical features (MAF), for the creation of the geometrical model (surface and solid) of the human mandible. Methods. The method was based on Referential Geometrical Entities (RGEs) which have been defined on mandible polygonal model in accordance with anatomical properties of the mandible. Polygonal model was created over the input data (anatomical landmarks of the mandible) acquired from computed tomography scans. For the creation of computer-aided design (CAD) models in CATIA software, referential geometrical entities were defined according to the bone geometry and morphology features. Results. Definition of B-spline curves was performed on the body and on the ramus of the mandible. In this way, it was possible to create the geometrically accurate and anatomically correct three-dimensional geometric (surface and solid) models. The accuracy of the obtained surface model was tested through comparison with the geometry of the original bone model. Conclusion. Compared to the previously applied methods for creating geometric models, MAF provides more satisfactory results, and in some cases even better.

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