The popularization of podcasting provides Internet users more opportunities to access interesting and entertaining multimedia content. The podcasting content hosting sites became the shared platforms for all Internet users to access third-party contributions. More and more Internet users are encouraged to become active content providers that share their resources and multimedia productions. Building a large scale multi-user 3D application can benefit from the same content distribution pattern as the development cost can be distributed if the application implementation is outsourced. The application is constructed by integrating 3D content from various third-party service providers. In addition, the implementation outsourcing can inspire contributors to provide creative application content. Unfortunately, sharing and distributing 3D resources are more challenging and the podcasting framework cannot resolve the problems effectively.
We introduce a standardized framework that supports the seamless integration of distributed 3D resources as coarse-grained components of constructed Distributed Virtual Environments (DVEs). Component Application Framework For Extensible NEtworked Virtual Environments (Caffe Neve) uses service-oriented architecture (SOA) and incorporates streaming technology for dynamic content delivery. Using Caffe Neve, third-party developers can create distributed services to stream 3D content. The framework provides an application integrator that constructs a shared virtual environment and delivers the application content to the end users.
In this paper we describe the framework details. The application integration infrastructure of the framework is designed based on a distributed Model-View-Controller model. The framework uses an ontology to support the semantic level content integration and service coordination. In addition, the framework incorporates streaming within the architecture for the real-time data delivery and improved performance. By deploying services within the framework, 3D resource owners can conveniently podcast or broadcast their 3D content to the end users. In the end, we demonstrate how to use the framework to construct 3D podcast and broadcast applications. Regardless of the type of 3D applications and delay tolerance, performance is important and has to be carefully studied. We evaluate the framework performance by examining the sample application and present the analysis results. We also present the experiment results on the simulated framework application in large scale by using simulation tools.