International audienceWe propose to illustrate how the PAC-C3D software model makes it possible to share networked 3D Virtual Environments (VE) between heterogeneous 3D viewers written in Java3D and jReality

Duval, Thierry

Fleury, Cédric

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HAL Id: inria-00638638https://hal.inria.fr/inria-00638638Submitted on 6 Apr 2014HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.L’archive ouverte pluridisciplinaire HAL, estdestinée au dépôt et à la diffusion de documentsscientifiques de niveau recherche, publiés ou non,émanant des établissements d’enseignement et derecherche français ou étrangers, des laboratoirespublics ou privés.Enabling Collaboration between Heterogeneous 3DViewers through a PAC-C3D Modeling of the SharedVirtual EnvironmentThierry Duval, Cédric FleuryTo cite this version:Thierry Duval, Cédric Fleury. Enabling Collaboration between Heterogeneous 3D Viewers through aPAC-C3D Modeling of the Shared Virtual Environment. ICAT 2011 (The 21st International Confer-ence on Artificial Reality and Telexistence), VRSJ, Nov 2011, Osaka, Japan. pp.156. ￿inria-00638638￿Collaboration between Networked Heterogeneous 3D Viewersthrough a PAC-C3D Modeling of the Shared Virtual EnvironmentThierry Duval ∗Université de Rennes 1, IRISA UMR CNRS 6074, Rennes, FranceCédric Fleury†INSA de Rennes, IRISA UMR CNRS 6074, Rennes, FranceABSTRACTWe propose to illustrate how the PAC-C3D software model makesit possible to share networked 3D Virtual Environments (VE) be-tween heterogeneous 3D viewers written in Java3D and jReality.Keywords: Software Architectural Models for CVEIndex Terms: H.5.2 [Information Interfaces and Presentation(e.g., HCI)]: User Interfaces—Theory and methods; I.3.7 [Com-puter Graphics]: 3-Dimensional Graphics and Realism—Virtualreality; D.2.11 [Software Engineering]: Software Architectures—Patterns1 THE PAC-C3D MODELWe propose to design each object of a Collaborative Virtual En-vironment (CVE) according to the PAC-C3D model [1] illustratedfigure 1. It is an explicit evolution of the PAC model dedicatedto 3D CVE. On each user’s computer, shared virtual objects of aCVE must be decomposed into three main kinds of components de-scribed by three interfaces. The Abstraction is in charge of the coredata and behavior of the object, the Presentations are in charge ofthe virtual representation of the object to the user, and the Controlis in charge of the consistency maintenance between Abstractionand Presentations, and between all the distributed Controls of theshared object.Figure 1: Adaptation of the PAC model for 3D CVE2 VIEWING THE SAME VE WITH DIFFERENT VIEWERSPAC makes it possible to design a VE with very small dependencyto the 3D graphics API used for the 3D rendering: it proposes toconfine all the graphics features of the virtual object in its Presen-tation. PAC-C3D proposes to use explicit interfaces components tostrengthen this separation: it makes the Control components totallyindependent of the implementation of the Presentation components.The same 2D GUI and external interaction devices allow also todrive in a similar way these 3D viewers, as all the interaction andnavigation orders are sent to Control and then to Abstraction com-ponents. We have used this model to design our IIVC [2] and threeviewers based on Java3D, jReality and jMonkey.∗e-mail: thierry.duval@irisa.fr†e-mail: cedric.fleury@irisa.frFigure 2: Two different viewers sharing the same virtual environment3 SHARING THE SAME VE BETWEEN DIFFERENT VIEWERSPAC-C3D allows these different 3D viewers to share the same 3DVE at run-time (see figure 2) over a network. PAC-C3D proposesto put all the collaborative features (distribution, synchronization,etc.) in the Control components, ensuring that each evolution of avirtual object is distributed to the other Control components of thisvirtual object, according to their distribution policy [3].4 ENRICHING 3D VIEWERS INTER-OPERABILITYIt is possible to enrich the interaction possibilities of a viewer Xwith extra functions provided by an other viewer Y. It consists inallowing the viewer X to control a virtual object provided by theviewer Y. The viewer X owns a local Control of this object, so eachorder given to this local Control by the viewer X will be forwardedto the Control of the object on the viewer Y that will forward it to itsAbstraction. To be more efficient, the distribution policy of this vir-tual object can be changed dynamically at run-time. For example,the Referent Control can be migrated to the same process than theviewer Y. These exchanges between different viewers strengthentheir inter-operability.5 CONCLUSIONPAC-C3D makes it possible to design a CVE with very small depen-dency on a 3D graphics API, and it makes it easy to use different3D graphics API on different remote computers sharing the samecollaborative session, providing easy inter-operability between 3Dgraphics API such as Java3D, jReality and jMonkey.ACKNOWLEDGEMENTSThis work was partly funded by the French Research NationalAgency project named Collaviz (ANR-08-COSI-003-01).REFERENCES[1] T. Duval and C. Fleury. PAC-C3D: A New Software ArchitecturalModel for Designing 3D Collaborative Virtual Environments. In Proc.of ICAT, page to Appear, 2011.[2] C. Fleury, A. Chauffaut, T. Duval, V. Gouranton, and B. Arnaldi. AGeneric Model for Embedding Users’ Physical Workspaces into Multi-Scale Collaborative Virtual Environments. In Proc. of ICAT, pages 1–8,2010.[3] C. Fleury, T. Duval, V. Gouranton, and B. Arnaldi. A New AdaptiveData Distribution Model for Consistency Maintenance in CollaborativeVirtual Environments. In Proc. of JVRC, pages 29–36, 2010.

Enabling Collaboration between Heterogeneous 3D Viewers through a PAC-C3D Modeling of the Shared Virtual Environment

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Enabling Collaboration between Heterogeneous 3D Viewers through a PAC-C3D Modeling of the Shared Virtual Environment

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