Adapting multiuser 3D virtual environments to heterogeneous devices

Regina Borges de AraujoAlessandro Rodrigues e SilvaGlauco Todesco

With the growing dissemination and reliability ofwireless networks and the emergence of devices withincreasing processing and communication power,applications that up to now were restricted to the PCsare being envisaged to run on devices as heterogeneousas wrist clocks, refrigerators with access to the internet,mobile phones, PDAs, set-top-boxes, game consoles etc.Application development for this myriad of devices andnetworks with different capabilities requires specialattention from the software programmers and designers -especially when these applications are shared amongmultiple users. Application adaptation, which allows asoftware to react to device and environment resourcevariations, is an important process to fit the applicationto a certain device configuration. A large amount of workhas focused on the adaptation of multimedia such as text,images, audio and video. Less attention has been givento 3D media adaptation - firstly because of the complexityinvolved in the 3D application adaptation, and alsobecause true marketing opportunities for 3Dapplications in heterogeneous devices have just beganto emerge. This paper analyses 3D media adaptation asa nonfunctional requirement for 3D multiuser virtualenvironment applications. An adaptation framework isproposed that can be integrated to the MPEG-4 standardto offer a solution to the adaptation of 3D multiuser virtualenvironment applications, which can be accessed fromheterogeneous devices with different capabilities. Theadvantages of integrating the framework to the MPEG-4standard are twofold: it favors the creation of complexapplications, with high degree of interaction, such asmultiuser 3D collaborative environments; and makeseasier to build these applications for heterogeneousdevices (from cellular phones to PDAs and set-top-boxes)since MPEG-4 is aimed at small mobile devices andnarrowband networks, such as some wireless networks.

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