The Treatment of Tullio Lombardo’s <i>Adam</i>: A New Approach to the Conservation of Monumental Marble Sculpture

Riccardelli, Carolyn; Morris, Michael; Wheeler, George; Soultanian, Jack; Becker, Lawrence; Street, Ronald

doi:10.1086/680027

Cited by 20 publications

(10 citation statements)

References 15 publications

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“…The second approach has a range of slightly different methods, such as bare simplification of the triangular surface mesh before converting it in a volumetric one, that may give significant deviations between the actual shape and the simulated one [7]. The simplified description of the shape in this case are discretized profiles giving a low-resolution representation of the interior and the exterior of the structure, from which produce a volumetric model or the fitting of the acquired model with a parametric model suitable to be converted in volumetric mesh.…”

Section: State Of the Artmentioning

confidence: 99%

A New Methodology for the Structural Analysis of 3D Digitized Cultural Heritage through FEA

Barsanti

Guidi

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Finite Elements Analysis (FEA) is widely used for modelling stress behaviour in any mechanical system. The processing workflow starts from CAD 3D models representing the ideal shape of the object to be simulated. Such models are typically made of mathematical elements defining its geometrical components. Those are pre-processed before the simulation for creating a volumetric mesh out of the CAD model. Recently the use of FEA has also been extended to the simulation of ancient structures and artefacts, revealing significant potentialities for the conservation of Cultural Heritage. Unlike modern mechanical systems, heritage objects are usually altered by the time passed since their original creation, and the representation with a schematic CAD model may introduce an excessive level of approximation leading to wrong simulation results. In the last two decades, 3D documentation of CH has been developed through reality-based approaches. However, the related mesh models of the exterior surfaces are not proper for direct use in FEA. Such high-resolution surface meshes has to be converted to volumetric meshes made of tetrahedral or hexahedral elementary volumes and a limited number of external and internal nodes. The focus of this paper is on a new method aiming at generating the best possible 3D solid representation of a real artefact from its accurate reality-based surface model by reducing its number of nodes of several orders of magnitude while maintaining a geometrical coherence in the order of the measurement uncertainty of the 3D capturing technique used. The approach proposed is based on wise use of retopology procedures and a transformation of this retopologized model to a mathematical one made by NURBS surfaces, suitable for being processed by a volumetric mesh generator typically embedded in any standard FEM package. The resulting volumetric mesh allows obtaining FEA of ancient structures, providing a far better accurate simulation than those attainable by a rough CAD redrawing of the heritage asset of interest.

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Section: State Of the Artmentioning

confidence: 99%

A New Methodology for the Structural Analysis of 3D Digitized Cultural Heritage through FEA

Barsanti

Guidi

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…If this procedure, with all its accuracy limitations, can be applied to CH buildings because the geometry of the structure can be replicated through a CAD drawing using profiles, cannot be instead used for statues, whose geometry is more complex and that cannot be simplified through elements as bean, truss or shell, used for the modelling in FEA. The second approach has a range of slightly different methods: i) bare simplification of the triangular surface mesh before converting it in a volumetric one, that may give significant deviations between the actual shape and the simulated one (Riccardelli et al, 2014); ii) the simplified description of the shape through a set of profiles that are then discretized for generating a limited number of nodes, for creating a reliable low resolution representation of the interior and the exterior of a structure, from which produce a volumetric model (Castellazzi et al, 2015); iii) the fitting of the acquired model with a parametric model suitable to be converted in volumetric mesh (Bassier et al, 2016). Finally, the last approach does not even pass from the mesh, generating a volumetric approximation of the shape from the raw 3D cloud of points (Shapiro and Tsukanov, 1999), later compared by the same authors to the other approaches (Freytag et al, 2011;Shapiro et al, 2011).…”

Section: State Of the Artmentioning

confidence: 99%

A Geometric Processing Workflow for Transforming Reality-Based 3d Models in Volumetric Meshes Suitable for Fea

Barsanti

Guidi

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Conservation of Cultural Heritage is a key issue and structural changes and damages can influence the mechanical behaviour of artefacts and buildings. The use of Finite Elements Methods (FEM) for mechanical analysis is largely used in modelling stress behaviour. The typical workflow involves the use of CAD 3D models made by Non-Uniform Rational B-splines (NURBS) surfaces, representing the ideal shape of the object to be simulated. Nowadays, 3D documentation of CH has been widely developed through reality-based approaches, but the models are not suitable for a direct use in FEA: the mesh has in fact to be converted to volumetric, and the density has to be reduced since the computational complexity of a FEA grows exponentially with the number of nodes. The focus of this paper is to present a new method aiming at generate the most accurate 3D representation of a real artefact from highly accurate 3D digital models derived from reality-based techniques, maintaining the accuracy of the high-resolution polygonal models in the solid ones. The approach proposed is based on a wise use of retopology procedures and a transformation of this model to a mathematical one made by NURBS surfaces suitable for being processed by volumetric meshers typically embedded in standard FEM packages. The strong simplification with little loss of consistency possible with the retopology step is used for maintaining as much coherence as possible between the original acquired mesh and the simplified model, creating in the meantime a topology that is more favourable for the automatic NURBS conversion.

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“…Similarly, digital fabrication techniques were also used to create full size replicas fragments and for assembly testing for the case of the restoration of the unfortunate shattering of the Tullio Lombardo's Adam[RMW*14].…”

Section: Applicationsmentioning

confidence: 99%

Digital Fabrication Techniques for Cultural Heritage: A Survey

Scopigno

Cignoni

Pietroni

et al. 2015

Computer Graphics Forum

123

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Digital fabrication devices exploit basic technologies in order to create tangible reproductions of 3D digital models. Although current 3D printing pipelines still suffer from several restrictions, accuracy in reproduction has reached an excellent level. The manufacturing industry has been the main domain of 3D printing applications over the last decade. Digital fabrication techniques have also been demonstrated to be effective in many other contexts, including the consumer domain. The Cultural Heritage is one of the new application contexts and is an ideal domain to test the flexibility and quality of this new technology. This survey overviews the various fabrication technologies, discussing their strengths, limitations and costs. Various successful uses of 3D printing in the Cultural Heritage are analysed, which should also be useful for other application contexts. We review works that have attempted to extend fabrication technologies in order to deal with the specific issues in the use of digital fabrication in the Cultural Heritage. Finally, we also propose areas for future research.

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The Treatment of Tullio Lombardo’s Adam: A New Approach to the Conservation of Monumental Marble Sculpture

Cited by 20 publications

References 15 publications

A New Methodology for the Structural Analysis of 3D Digitized Cultural Heritage through FEA

A New Methodology for the Structural Analysis of 3D Digitized Cultural Heritage through FEA

A Geometric Processing Workflow for Transforming Reality-Based 3d Models in Volumetric Meshes Suitable for Fea

Digital Fabrication Techniques for Cultural Heritage: A Survey

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