Open Community

A proposal of standard for multiuser enabling technologies from Mitsubishi Electric Research Laboratories (MERL)

Spline (Scalable Platform for Large Interactive Networked Environments) is an implementation compliant with OC which provides a library with ANSI C and Java API.

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Open Community (OC) is a proposal of standard for multiuser enabling technologies from Mitsubishi Electric Research Laboratories. Spline (Scalable Platform for Large Interactive Networked Environments) is an implementation compliant with OC which provides a library with ANSI C and soon Java API. Such library provides very detailed and essential services for real-time multi-user cooperative applications. For its communication, Spline uses the Interactive Sharing Transfer Protocol (ISTP) which is a hybrid protocol supporting many modes of transportation for VR data and information, namely

Spline uses the Interactive Sharing Transfer Protocol (ISTP) which is a hybrid protocol supporting many modes of transportation for VR data and information:

• 1-1 Connection Subprotocol: Used to establish and maintain a TCP connection
  between two ISTP processes;

• Object State Transmission Subprotocol: Used to communicate the state of objects from one ISTP process to another. Such updates may be sent via 1-1 Connection or UDP Multicast (1-1 Connection is used as a backup route);

• Streaming Audio Subprotocol: Used to stream audio data via RTP;

• Locale-Based Communications Subprotocol: This is the core of ISTP and supports the sharing of information about objects in the world model;

• And Content-Based Communication Subprotocol: Supports central server style communication of beacon information. Beacons are tags through which is it possible to retrieve a given object (similar to an URL).

The last two subprotocols are build upon the other three. ISTP does not provide videostreaming capability to date, however such support could be provided by extending ISTP with an extra appropriated subprotocol.

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