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>Scientifiques (25) | Magazines et revues (9) | Rapports de fouille (5) |
25. Digital and handcrafting processes applied to sound-studies of archaeological bone flutes
Proceedings of the International Conference on Culturage Heritage, EuroMed (2016)
Etienne Safa, Jean-Baptiste Barreau, Ronan Gaugne, Wandrille Duchemin, Jean-Daniel Talma, Bruno Arnaldi, Georges Dumont, Valérie Gouranton

Bone flutes make use of a naturally hollow raw-material. As nature does not produce duplicates, each bone has its own inner cavity, and thus its own sound-potential. This morphological variation implies acoustical specificities, thus making it impossible to handcraft a true and exact sound-replica in another bone. This phenomenon has been observed in a handcrafting context and has led us to conduct two series of experiments (the first-one using handcrafting process, the second-one using 3D process) in order to investigate its exact influence on acoustics as well as on sound-interpretation based on replicas. The comparison of the results has shed light upon epistemological and methodological issues that have yet to be fully understood. This work contributes to assessing the application of digitization, 3D printing and handcrafting to flute-like sound instruments studied in the field of archaeomusicology.

24. Internal 3D Printing of Intricate Structures
Proceedings of the International Conference on Culturage Heritage, EuroMed (2016)
Théophane Nicolas, Ronan Gaugne, Cédric Tavernier, Valérie Gouranton, Bruno Arnaldi

Additive technologies are increasingly used in Cultural Heritage process , for example in order to reproduce, complete, study or exhibit artefacts. 3D copies are based on digitization techniques such as laser scan or photogramme-try. In this case, the 3d copy remains limited to the external surface of objects. Medical images based digitization such as MRI or CT scan are also increasingly used in CH as they provide information on the internal structure of archaeological material. Different previous works illustrated the interest of combining 3D printing and CT scan in order to extract concealed artefacts from larger archaeological material. The method was based on 3D segmentation techniques within volume data obtained by CT scan to isolate nested objects. This approach was useful to perform a digital extraction, but in some case it is also interesting to observe the internal spatial organization of an intricate object in order to understand its production process. We propose a method for the representation of a complex internal structure based on a combination of CT scan and emerging 3D printing techniques mixing colored and transparent parts. This method was successfully applied to visualize the interior of a funeral urn and is currently applied on a set of tools agglomerated in a gangue of corrosion.

23. 3d digitisation and reconstruction of a capital in northwestern gaul: interim results on the city of alet
Proceedings of the 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation 'ARQUEOLÓGICA 2.0' in Valencia (2016)
Yann Bernard, Jean-Baptiste Barreau, Catherine Bizien-Jaglin, Laurent Quesnel, Loïc Langouët, Marie-Yvane Daire

The City of Alet is an important archaeological site in Brittany because it was in the late Iron Age the capital of the Coriosolites. The remains, scattered today in a neighbourhood of Saint-Malo, are highly heterogeneous. Because of its great archeological interest, it has become since 2015 the subject of experimentation in digital archeology. From 3D scanning and Ground Penetrating Radar experimentation, we started a 3D reconstruction of city including several levels of uncertainty and fuelling archaeological thoughts, the results of which are still in discussion.

22. Les stèles gravées du plateau de la bretellière à saint-macaire-en-mauges (maine-et-loire, france)
Arqueología y Prehistoria del Interior Peninsular (2016)
Emmanuel Mens, Gérard Berthaud, Paul Raux, Bruno Berson, avec la collaboration de Roger Joussaume, Yann Le Jeune, Stéphane Jupin, Jean-Baptiste Barreau, Yann Bernard, Serge Cousseau et Didier Pfost

Le plateau de la Bretellière à Saint-Macaire en Mauges (Maine-et-Loire) est un site exceptionnel où l’art monumental du Ve millénaire est situé dans un espace préservé. Pour la plupart, les stèles gravées n’ont pas bougées depuis 6000 ans et sont donc étudiables dans leur contexte initial. Les zigzags et les serpentiformes sont les deux signes « phares » du plateau et montrent des affinités avec la Péninsule Ibérique. Avec quatre mètres de long, l’un d’entre eux est le décor mégalithique en ligne brisée le plus imposant d’Europe. Par lumière rasante, il est actuellement visible à 150 mètres de distance. Profitant de l’immuabilité des stèles, des distances et des zones de visibilité bien spécifiques de leurs gravures ont été calculées. Les premiers résultats s’orientent vers l’existence d’un cheminement longeant les différentes figures inscrites sur les parois minérales.

21. Megalithic constructional techniques in north-west France: cairn III at Prissé-la-Charrière
The Megalithic Architectures of Europe. Oxbow Books. Laporte, L., Scarre, C. (Eds.) (2016)
Florian Cousseau

Independent circular cairns have been observed since the 19th century within long quadrangular mounds. These cairns, called rotundas since 1936 in Great Britain, are present in the west of France but have been little studied. Given the methods and knowledge available at the time, their original discovery did not lead to comprehensive architectural studies. In 2001, a rotunda was unearthed in tumulus C of Péré at Prissé-la-Charrière, allowing us to return to the issues concerning rotundas: how were they built; to what degree were they autonomous in relation to the covering monument; and what might have been their morphology? Since 2007, a methodology developed for historical architecture has been used in the excavation of tumulus C: building archaeology. It allows us to deconstruct the monument, establishing its construction sequences, and understand the intentions and the technical quality of the builders. This data is used to better understand the chronology of the monument, the objectives of its construction, and to reconstruct its original morphology, in order to establish its autonomy from the long mound that encloses it.

20. 3D reconstitution of the loyola sugar plantation and virtual reality applications
Proceedings of Computer Applications and Quantitative Methods in Archaeology, CAA (2015)
Jean-Baptiste Barreau, Quentin Petit, Yann Bernard, Reginald Auger, Yannick Le Roux, Ronan Gaugne and Valérie Gouranton

Discovered in 1988, the Loyola sugar plantation, owned by the Jesuits in French Guiana, is a major plantation of colonial history and slavery. Ongoing archaeological excavations have uncovered the Jesuit’s house and the outbuildings usually associated with a plantation such as a chapel and its cemetery, a blacksmith shop, a pottery, the remains of the entire sugar production (a windmill, a boiler and a dryer), coffee and indigo warehouses etc. Based on our findings and our network with 3D graphic designers and researchers in virtual reality, a 3D restitution integrated within a virtual reality platform was initiated to develop a better understanding of the plantation and its surrounding landscape. Also, our work on the interactive changes of sunlight and animal sounds aims to reconstruct a coherent evolution during one day of the site's environment.

19. Touching and Interacting with Inaccessible Cultural Heritage
Presence: Teleoperators and Virtual Environments (2015)
Théophane Nicolas, Ronan Gaugne, Cédric Tavernier, Quentin Petit, Valérie Gouranton, and Bruno Arnaldi

The sense of touch provides a particular access to our environment, enabling a tangible relation with it. In the particular case of cultural heritage, touching the past, apart from being a universal dream, can provide essential information to analyze, understand, or restore artifacts. However, archaeological objects cannot always offer a tangible access, either because they have been destroyed or are too damaged, or because they are part of a larger assembly. In other cases, it is the context of use that has become inaccessible, as it is related to an outdated activity. We propose a workflow based on a combination of computed tomography, 3D images, and 3D printing to provide concrete access to cultural heritage, and we illustrate this workflow in different contexts of inaccessibility. These technologies are already used in cultural heritage, but seldom combined, and are most often employed for exceptional artifacts. We propose to combine these technologies in case studies corresponding to relevant archaeological situations.

18. An Immersive Virtual Sailing on the 18th-Century Ship Le Boullongne
Presence: Teleoperators and Virtual Environments (2015)
Jean-Baptiste Barreau, Florian Nouviale, Ronan Gaugne, Yann Bernard, Sylviane Llinares, and Valérie Gouranton

The work presented in this article is the result of collaboration between historians and computer scientists whose goal was the digital reconstitution of Le Boullongne, an 18th-century merchant ship of La Compagnie des Indes orientale. This ship has now disappeared and its reconstitution aims at understanding on-board living conditions. Three distinct research laboratories have participated in this project so far. The first, a department of naval history, worked on historical documents, especially the logbooks describing all traveling events of the ship. The second, a research laboratory in archaeology, archaeoscience, and history, proposed a 3D model of the ship based on the original naval architectural plans. The third, a computer science research laboratory, implemented a simulation of the ship sailing in virtual reality.

17. Another brick in the wall: fifth millennium BC earthen-walled architecture on the Channel shores
Antiquity. Cambridge Univ Press. (2015)
Luc Laporte, Catherine Bizien-Jaglin, Julia Wattez, Jean-Noël Guyodo, Jean-Baptiste Barreau, Yann Bernard, David Aoustin, Véronique Guitton, Gwenaelle Hamon, Luc Jallot, Alexandre Lucquin, Ramiro March, Nancy Marcoux, Emmanuel Mens, Ludovic Soler and Elise Werthe

The west European Neolithic is famed for its funerary and ceremonial monuments, but the evidence for houses is sparse. Can this be explained by the materials of which they were built? On the northern coast of Brittany, the site of Lillemer rises from the surrounding marshes and presents abundant evidence of Middle Neolithic occupation, contemporary with the passage graves of the region. Surprisingly, their evidence includes the remains of collapsed earthen-walled structures, providing the northernmost example of this type of architecture in a Neolithic context and a possible explanation for the invisibility of much Neolithic domestic architecture.

16. Study of a wreck in foreshore context
The International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences (2015)
O. Hulot , M. Jaouen, J.-B. Barreau, Y. Bernard, Q. Petit, R. Gaugne, V. Gouranton

We present the study of a wreck, in a foreshore area, in the North of Brittany, France, using two different digitization methods, photogrammetry and laser scanning. The digitization process had to deal with the tide constraints. The 3D data produced using these technologies has been deployed in a large immersive infrastructure dedicated to virtual reality research, in order to propose new practises for archaeologists. The overall purpose of our research project is to define an innovative and efficient methodology for the study and preservation of cultural heritage in an inter-tidal context. In the inter-tidal context, heritage is really fragile and the risk of destruction is real (storms, erosion, coastal development...). The traditional methods are no longer efficient. This paper describes preliminary results, through the joint work of a research institute specialized in underwater archaeology, a research laboratory of archaeology and archaeosciences, and a research laboratory in computer science.

15. Photogrammetry Based Study of Ceramics Fragments
International Journal of Heritage in the Digital Era (2014)
J-B. Barreau, T. Nicolas, G. Bruniaux, E. Petit, Q. Petit,Y. Bernard, R. Gaugne and V. Gouranton

Reconstitution of whole ceramics from fragments is a true priesthood for ceramographers. This activity remains mainly handled by manual sketching and can be very time consuming. However, more and more tools and workflows provide digital solutions, based on 3D technologies, to assist such tasks. In this paper, we present an application of photogrammetry on ceramic fragments from two excavation sites located in Brittany, France. This study was required by two ceramics specialists and conducted in CReAAH, a French research center in archaeology, archaeosciences and history. The 3D restitution by photogrammetry of these different fragments allowed reconstructions of the original shapes of the potteries or at least to get to as close as possible. We furthermore used the resulting 3D models of the ceramics to compute various metrics required by the ceramographers. In collaboration with IRISA, a French research center in computer science, we designed and generated a presentation support using a 3D printer. This work is based on affordable tools and illustrates how 3D technologies can be quite easily integrated in archaeology process with limited financial resources, to obtain useful results for the study and analysis of such artefacts.

14. La Réalité Virtuelle au Conservatoire Numérique du Patrimoine Archéologique de l’Ouest
9es journées de l’Association Française de Réalité Virtuelle, Augmentée, Mixte et d’Interaction 3D (AFRV) (2014)
Jean-Baptiste Barreau, Ronan Gaugne, Valérie Gouranton

L’objectif du travail présenté est de fournir aux archéologues, des outils de travail basés sur la réalité virtuelle. Ces outils vont pouvoir être utilisés à différentes étapes : (i) pour l’analyse scientifique et la compréhension de contextes archéologiques, (ii) pour valider certaines hypothèses, argumenter et démontrer, (iii) pour diffuser, à des fins pédagogiques et de médiation scientiques. Les différents sites étudiés dans le cadre de ce travail portent sur des travaux d’archéologie en cours, qui ont pu bénéficier de l’apport de la réalité virtuelle : le cairn de l’ile de Carn, la villa Gallo-Romain du bourg Saint-Père, le temple Gallo-Romain du Haut-Bécherel, le donjon de Sainte-Suzanne, la chapelle de Languidou, le navire de la compagnie des Indes « Le Boullongne ».

13. Bronze age hoards and cremations : deposition practices revealed by tomography and 3d printing
Colloque international: Les nouvelles technologies appliquées au patrimoine : perspectives et enjeux (2014)
Théophane Nicolas, Cédric Tavernier, Ronan Gaugne, Valérie Gouranton and Bruno Arnaldi

Preserving archaeological material while excavating and analysing it, is a major concern for archaeologists. This problematic is often difficult to address because studied artefacts may be encased in corroded materials or a block of block of cremated bones, or integrated with, and inseparable from, larger assemblies, such as manufactured objects composed of several pieces. Once a material is destructed, some hypotheses on the original structure become unverifiable. We aim at proposing a workflow for analysing archaeological artefacts by combining computed tomography with 3D printing, which is non-destructive, and accurate enough to perform further analysis. Computed tomography (CT) is an imaging technology widely used in medicine, CT scanners use computer-processed x-rays to produce tomographic images (virtual «slices») of specific areas of the scanned object. The data provided by CT scanning is processed to produce 3D volume and surface data of encased artefacts, which can be use to generate 3D images or 3D tangible copies. We already successfully applied this methodology for the a priori analysis of archaeological material, accessing to encased artefacts through 3D images, and 3D printed replications without any irreversible physical action on the original material. We illustrate now an a posteriori utilization of the same methodology by working on the 3D data of a Bronze Age deposit (conglomerate of bracelets) and of a Bronze Age cremation after laboratory macro-excavation. The goal of the first work is to study a tangible representation of the conglomerate after the separation of the different bracelets. Starting from CT data generated before the destruction of the conglomerate, we propose several 3D surface models to study the shape of the conglomerate and propose hypotheses on the original container of the bracelets. The 3D surface models have been 3D printed to produce tangible material helping for the understanding of the shape. In the second work, we illustrate how CT scan can be used to retrieve information on vanished material in a cremation block. The volume model generated from CT data allows to detect clues on the container composition by providing 3D images of its imprint. This information would have been hardly detected from a destructing analysis of the cremation block. While our workflow demonstrated highly interesting application for the domain of archaeological and cultural heritage, we faced several locks and identified new promising tracks. A first obstacle concerns the software used in this work, dedicated to medical images processing. Some improvements are required to adapt this technology to digital heritage specificities. We also plan to combine this workflow with mixed reality technologies in order to introduce tangible or virtual interaction with the original material and 3D data.

12. Ceramics Fragments Digitization by Photogrammetry, Reconstructions and Applications
International Conference on Culturage Heritage, EuroMed (2014)
J-B. Barreau, T. Nicolas, G. Bruniaux, E. Petit, Q. Petit, Y. Bernard, R. Gaugne and V. Gouranton

This paper presents an application of photogrammetry on ceramic fragments from two excavation sites located north-west of France. The restitution by photogrammetry of these different fragments allowed reconstructions of the potteries in their original state or at least to get to as close as possible. We used the 3D reconstructions to compute some metrics and to generate a presentation support by using a 3D printer. This work is based on affordable tools and illustrates how 3D technologies can be quite easily integrated in archaeology process with limited financial resources.

11. Preservative approach to study encased archaeological artefacts
International Conference on Culturage Heritage, EuroMed (2014)
Ronan Gaugne, Théophane Nicolas, Cédric Tavernier, Valérie Gouranton and Bruno Arnaldi

We propose a workflow based on a combination of computed tomography, 3D images and 3D printing to analyse different archaeological material dating from the Iron Age, a weight axis, a helical piece, and a fibula. This workflow enables a preservative analysis of the artefacts that are unreachable because encased either in stone, corrosion or ashes. The combination of computed tomography images with 3D printing provides a rich toolbox for archaeologist’s work allowing to access a tangible representation of hidden artefacts.

10. Combination of 3D Scanning, Modeling and Analyzing Methods around the Castle of Coatfrec Reconstitution
International Conference on Culturage Heritage, EuroMed (2014)
Jean-Baptiste Barreau, Yann Bernard, Quentin Petit, Laurent Beuchet, Emilien Petit, Volker Platen, Ronan Gaugne, Julien Le Rumeur and Valérie Gouranton

The castle of Coatfrec is a medieval castle in Brittany constituting merely a few remaining ruins currently in the process of restoration. Beyond its great archeological interest, it has become, over the course of the last few years, the subject of experimentation in digital archeology. Methods of 3D scanning were implored in order to gauge comparisons between the remaining structures and their absent hypothetical ones, resulting in the first quantitative results of its kind. This paper seeks to introduce the methods which carried out said research, as well as to present the subsequent results obtained using these new digital tools.

9. Immersia, an open immersive infrastructure: doing archaeology in virtual reality
Archeologia e Calcolatori, supplemento 5 (2014)
Ronan Gaugne, Valérie Gouranton, Georges Dumont, Alain Chauffaut et Bruno Arnaldi

This paper contributes to cross-domain mutual enrichment between archaeology and virtual reality. We present Immersia, an open high-end platform dedicated to research on immersive virtual reality and its usages. Immersia is a node of the european project Visionair that offers an infrastructure for high level visualisation facilities open to research communities across Europe. In Immersia, two projects are currently activeon on the theme of archaeology thematics. One is relative to the study of the Cairn of Carn, with the Creaah, a pluridisciplinary research laboratory of archeology and archeosciences, and one on the reconstitution of the gallo-roman villa of Bais, with the French institute INRAP.

8. Virtual reality tools for the West Digital Conservatory of Archaeological Heritage
Proceedings of the Virtual Reality International Conference (2014)
Jean-Baptiste Barreau, Ronan Gaugne, Yann Bernard, Gaétan Le Cloirec et Valérie Gouranton

In the continuation of the 3D data production work made by the WDCAH, the use of virtual reality tools allows archaeologists to carry out analysis and understanding research about their sites. In this paper, we focus on the virtual reality services proposed to archaeologists in the WDCAH, through the example of two archaeological sites, the Temple de Mars in Corseul and the Cairn of Carn Island.

7. Carrière de Menhirs, rochers naturels et maisons des morts: l’exemple du site de Roh-Coh-Coet, dans le Morbihan
Journée du "CReAAH" (2014)
Philippe Gouézin, Luc Laporte, Florian Cousseau, Jean-Baptiste Barreau et Yann Bernard

La mise en évidence, toute récente, d’une carrière d’extraction de grandes «stèles» néolithiques sur le site de Roh Coh Coët à Saint-Jean-Brévelay, dans les Landes de Lanvaux, est une découverte tout à fait exceptionnelle. Plusieurs milliers de pierres dressées sont recensées en Bretagne, dont certaines ont pu être transportées sur plusieurs kilomètres au moins, mais très rares sont en effet les carrières correspondantes à avoir été identifiées. Les landes de Lanvaux constituent l’une des principales concentrations de ces pierres dressées dans le département du Morbihan. La carrière a été aménagée au sommet d’une petite butte, dans un affleurement de granit feuilleté. Au moins trois négatifs d’enlèvements ont été identifiés à la suite d’une rapide prospection de surface, dont l’un d’entre eux porte encore le bloc en cours de dégagement...

6. Experiencing the past in virtual reality: A virtual reality event for the French National Days of Archaeology
4th IEEE International Conference on Cognitive Infocommunications (2013)
Ronan Gaugne, Gaétan Le Cloirec, Jean-Baptiste Barreau and Valérie Gouranton

This document reports a public exhibition organized during the French National Days of Archaeology, that is the result of an interdisciplinary collaboration between archaeologists and computer scientists, centered on the immersive virtual reality platform Immersia, a node of the European Visionair project. This public exhibition had three main goals: (i) presentating our interdisciplinary collaboration, (ii) communicating on the scientific results of this collaboration, and (iii) offering an immersive experience in the past for visitors. This paper presents the scientific context of the event, its organization, and a discussion on feedbacks.

5. The West Digital Conservatory of Archaeological Heritage project
Digital Heritage International Congress (2013)
Jean-Baptiste Barreau, Ronan Gaugne, Yann Bernard, Gaétan Le Cloirec and Valérie Gouranton

The West Digital Conservatory of Archaeological Heritage project, a.k.a. WDCAH, is a new French research organization whose aim is to both ensure the preservation of digital archaeological data, and deliver expertise in production, analysis, visualization and virtual reality exploration techniques. This project is an interdisciplinary project composed of engineers and researchers in archaeology, computer science, virtual reality and 3D interaction with virtual environments. The major objectives of this conservatory project are: (i) sustainable and centralized safeguarding and archiving of 2D/3D data produced by the archaeological community; (ii) free access to metadata; (iii) secure access to data for the different actors involved in scientific projects and (iv) the support and advice for these actors in the 3D data production and exploration through the latest digital technologies, modeling tools and virtual reality systems. This paper focuses on the first activities of the WDCAH which mainly concern digital models production using photogrammetry, 3D laser scans, and 3D computer graphics software. We are currently working on the reconstitution of six archaeological sites located in the west of France ranging from prehistory to the Middle Ages: the Cairn of Carn Island, the covered pathway of Roh Coh Coet, the Goh Min Ru megalithic site, the gallo-roman mansion of Vanesia, the keep of the Château de Sainte-Suzanne, the Porte des Champs of the Château d'Angers. Other proposals are currently under study.

4. Atlantic Megalithism: an aborted attempt for time and space domestication?
II International Congress on Archaeology of Transition: the Funerary World (2013)
Luc Laporte, avec la collaboration de Yann Bernard

Everybody agrees that the main developments of western European Megalithisms stands during the Neolithic period. However, to witch extent, how and even whether, the very first Atlantic Megalithisms should be linked to the adoption and rise of agriculture in Western Europe is still debated, since almost a century. We will mainly talk here about megaliths as funerary monuments. Death is obviously one of the major transitions in human life. Funerals participate to a negotiation of such transition by the livings. Funerary monuments can be seen as places of memory where growing and mineral worlds, time and space ordnance, are declined with concepts and values proper to each past society. "Domus" of the dead: elongated enclosures or mounds have been related since long with the plan of some LBK houses. In Northern Europe, the emergence of monumentality has always been associated with Megalithism, leading to confused debates while transposed to a wider scale. "Storing" ancestors: when the dead is buried at north, it is frequently deposited on top of the soil within storing places as pits (or ceramics) and caves (some were yet memory places) in South-western Europe. First hided below the ground such places will soon rise in the territory of the livings. Erecting big blocs: large weights of stones were yet removed during funeral practices and burials at least since the middle Mesolithic, while dating the first standing stones, erected or elevated on top of the ground, is still in debate. But, whatever, if erected or elevated big stones gave their name to the whole phenomenon, it includes also many other realizations. None of the preceding assumptions are sufficient on their own to explain Megalithism all over Atlantic Europe. None of it will be expressed exactly in the same way, nor with the same weight, through various regions and time. Integration of standing stones within the construction of various types of monuments, in a way to provide different types of funerary chambers, seems to firstly occur during the mid Vth millennium in Western France. Built for the dead of generation not yet birthed, some of these rocky ancestor's houses also constrain space with moving perspective effects. We will then wonder whether such megalithic constructions could not be also understood as an original but illusory attempt of time and space domestication, after those of plants and animals.

3. Conservatoire Numérique du Patrimoine Archéologique de l’Ouest (CNPAO)
Journée du "CReAAH" (2013)
Jean-Baptiste Barreau

La production de données numériques dans le domaine de l’archéologie suit une croissance exponentielle, en raison notamment de l’informatisation systématique de la gestion des données de terrain et de l’importance croissante accordée à l’imagerie informatique. Ces données multimédias, multithématiques et multi-sources sont aujourd’hui stockées de manières assez isolées par projet ou par chercheur sur des supports disséminés, ne permettant qu’une sécurisation, une pérennisation et un partage extrêmement limités...

2. Large-scale immersive reconstitution of a Neolithic corbel dome
International Symposium on Virtual Reality, Archaeology and Cultural Heritage (2012)
Ronan Gaugne, Jean-Baptiste Barreau, Florian Cousseau and Valérie Gouranton

We propose a workflow of tools and procedures to reconstruct an existing archaeological site as a virtual 3D reconstitution in a large scale immersive system. This interdisciplinary endeavor, gathering archaeologists and virtual reality computer scientists, is the first step of a joint research project with three objectives: (i) propose a common workflow to reconstruct archaeological sites as 3D models in fully immersive systems, (ii) provide archaeologists with tools and interaction metaphors to exploit immersive reconstitutions, and (iii) develop the use and access of immersive systems to archaeologists.In this context, we present results from the immersive reconstitution of Carn’s monument central chamber, in Finistère, France, a site currently studied by the Creaah archaeology laboratory. The results rely on a detailed workflow we propose, which uses efficient solutions to enable archaeologists to work with immersive systems. In particular, we proposed a procedure to model the central chamber of the Carn monument, and compare several softwares to deploy it in an imersive structure. We then proposed two immersive implementations of the central chamber, with simple interaction tools, and finally describe the European project Visionair which provides access to high level visualization facilities.

1. Les atouts de l’imagerie 3D pour l’archéologie de terrain (réflexions à partir d’exemples fouillés récemment en Bretagne)
Actes du colloque Virtual Retrospect (2009)
Gaétan Le Cloirec

The persons in charge of archaeological operations must explain différent observations in reports and publications which generally decompose into two main parts, one descriptive and one interpretative. The first is based on a speech supported by methodical records and photos while the second appeals to more imaginative resources which nevertheless have to base themselves on a credible reflection. At this level, the imaging 3D is an appropriate way to explain and justify a point of view by leaning on clear and demonstrative illustrations. The restitutions elaborated in this spirit can not be reduced to simple digital images but are conceived as means of study and argumentation since the phase of ground. These principles, implemented during several interventions made these last years in Brittany, allow to understand better and to restore more clearly sites often very damaged and with difficulty understandable. The set testifies of an evolution of the archaeological discipline through the emergence of new tools of reflection. To date, the reproduction of the examples convinces more and more local researchers of the possibilities offered by the imaging 3D in the functional analysis of sites and, by extension, in the understanding of the ancient societies.