1,720,984 research outputs found
3D procedural modeling of complex vaulted systems: Geometric rules vs SfM based modeling
No full textStarting from the geometric genesis of simple and complex vaulted systems, the paper proposes a workflow developing an algorithmic model for the construction of 3D digital surface model of some vaulted systems. The writing of an algorithm allows us to obtain pavilion and cross vaults digital surface models. To test the effectiveness of the models obtained in the application of the algorithms to real case studies, the ongoing phase of the research involved the survey of some complex vaulted systems based on Light Detection And Raging (LiDAR) and Structure from Motion (SfM) techniques. The models obtained by entering the data derived from the survey in the algorithm, allow a comparison between the model derived from dense matching techniques and the algorithmic model. In particular, the results obtained from the analysis of a cross vault system present in a side gothic chapel of the church of Santa Lucia in Cagliari are presented
Algorithmic Modelling as a Key Tool for Ribbed Vault Geometry
No full textThe paper proposes the first results of an ongoing research on the geometry of ribbed cross vaults starting from the principles and theories illustrated in some historical treatises. In the research, a particular role is assumed by algorithmic modelling which is an effective tool for the construction and verification of the geometry of the intrados surfaces of vaults. Starting from the studies conducted in this regard by the two Italian engineers. The construction of the digital models deriving from treatises by Curioni and Lamberti has allowed us to compare them with the geometry of the vaults of a side chapel of the church of Santa Lucia in Cagliari. Through the 3D laser scanner survey of these vaults, it was possible to evaluate which of the models proposed in the two treatises best approximated the case study of Santa Lucia in order to conduct algorithmic modelling of the surface closest to the geometry of the vaults revealed by the point cloud
Digital Translations of Paper Architectures|Traduzioni digitali di architetture di carta
No full textDigital gypsotheque. Online features as inclusive educational tool
Full text linkThe paper deals with the first results of an ongoing research on the issues of digitization of CH for educational and museum purposes. The research starts from the study of the small plaster casts collection kept inside the Santa Croce complex at the University of Cagliari. The workflow aims to investigate the potential of advanced technologies by reconciling the needs strictly related to the two principles of measurement and visualization. The construction of an information system will facilitate not only the classification and management of the digital plaster collection but also communication for scientific and didatic purposes. Two different possible applications are considered: the first for the construction of a web platform for the remote interactive query of the database, the second for the virtual visit of the rooms that host some of the casts through the delivery platform for point & click games developed in the PAC-PAC research project
Analysis and Geometric Modelling of Stellar Vaults of the Mediterranean Gothic in HBIM Environment
No full textSurvey and architectural representation, intended as moments in a path of knowledge, can connote themselves as processes aimed at the study of the rules that govern the formal principles of architecture. Surveying and drawing a vaulted system means researching its formal genesis, the construction procedures and the structural solutions that distinct it. In the study of vaulted systems, digital modelling defines a path of reinterpretation of formal genesis: by translating and revealing geometry as a principle generating form and idea, digital modelling emphasizes the heuristic function of drawing. This occurs only when the representation, and therefore the modelling, introduces a discretization
of the form. Through the selection of some case studies of stellar vaults found in religious architecture in the city of Cagliari, the paper presents the application of procedural modelling processes in the BIM environment starting from the survey of point clouds acquired with 3D Terrestrial Laser Scanner technology systems (TLS). The experimentation of these processes on the historical architecture poses several challenges related first to the definition of the levels of
knowledge of the building and to the modelling of the geometric components deriving from the survey. The objective of the paper is to trace a workflow that, overcoming the limits currently inherent in the local modelling of complex
architectural elements in the BIM environment, introduces procedural modelling when it is not possible to resort to libraries of precompiled parametric objects that can be reused, as often happens in the so-called HBIM processes
Virtual environments to communicate built cultural heritage: a HBIM based virtual tour
Full text linkHBIM methodology is nowadays widely used for the management of all aspects of architectural heritage, from survey to analysis, up
to protection and management issues. This interest is due to the potential that HBIM methodology offers in terms of collection,
processing, management and sharing of information, through a multidimensional and multidisciplinary approach. Practical
application of HBIM are the Scan-to-BIM processes, i.e. the digital reproduction of architectures starting from survey methodologies
based on laser scanning and photogrammetry.
An increasingly frequent application of HBIM models is their integration in game engines for educational or communicative
purposes. Actually, examples of AR and VR applications, serious games or virtual tours employing such models are increasingly
frequent. Indeed, such tools allow the generation of virtual immersive environments in which the user is free to navigate or interact
with objects. The use of virtual environments that reproduce real places or architectures, is able to generate new attraction and
interest in users, while facilitating immaterial accessibility and, allowing a dynamic formulation of content, greater ease of
understanding and reading calibrated to the user. The paper aims at the development of a virtual tour set entirely in the former
Jesuitical Complex of Santa Croce, located in the historical district of Castello in Cagliari. This tour will be a potential tool to
support the understanding and communication of historic architecture by going to the virtual accessibility of the complex
Analytical representation of architectural built heritage. A Sketch-to-Bim approach
Full text linkHBIM methodology is increasingly used for the management of all aspects of architectural heritage, from survey and analysis to
conservation, management and restoration issues.
Application of HBIM are the so-called Scan-to-BIM processes in which the artifact is surveyed with digital techniques of laser
scanning and photogrammetry. These techniques result in point clouds, the basis of the subsequent process of informative and
geometric modelling of the artifact. The resulting "smart models" are composed of parametric objects rich in information that can be
easily updated at any time.
The proposed methodology aims at integrating a study of architectural orders, whose results become preparatory to the subsequent
phases of survey and modeling, to the classic Scan-to-BIM workflows. In particular, in the modeling these results have allowed a
more targeted choice of techniques used.
The method has been applied to the atrium of the former Jesuit College of Santa Croce in Cagliari, which today hosts one of the seats
of the Faculty of Engineering and Architecture of the University of Cagliari; in particular, the atrium of the east body of the former
Jesuit College, designed by the Piedmontese architect Antonio Felice De Vincenti, has been modelled
FROM LIDAR DATA TOWARDS HBIM FOR STRUCTURAL EVALUATION
Full text linkIn HBIM processes, the extraction of geometric components from 3D point clouds data can sometimes be a complex process. The so-called "Scan to BIM" process has been widely utilized: deriving 3D models from point clouds often a local modelling of geometric components is necessary. This leads in most cases to use external modelling tools or complex local modelling processes. In both cases, we often get a model that cannot be reused for other items belonging to the same category, contravening the BIM philosophy. Vaulted systems are a typical example of complex elements that we can find in historical architecture. The paper presents the first results of an ongoing research on geometric modelling and structural evaluation of masonry ribbed vaults. An algorithm is developed to generate a NURBS surface of masonry vaults that, starting from the data extrapolated from the point cloud, allows to obtain an HBIM family. The research aims to overcome the inability to reference to standardised objects in local modelling of historical architecture elements. Directed to a standardization in the geometric modelling process of 3D laser scan data, the developed workflow is a possible alternative to commonly used workflows. Particular attention is focused on a case study of stellar vaults, a special class of masonry ribbed vaults whose three-dimensional geometry features a star-shaped projection on the horizontal plane. The work is carried out to verify that this family can be used for the structural analysis of stellar masonry vaults
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