Summary Background Requirements Design Basis RFP Process Milestones
The Web3D Consortium's Extensible 3D (X3D) Working Group requests technology contributions for development of the X3D Compressed Binary Encoding.
Due date for submissions: 1 November 2003, sent by email to X3D Specification Team at x3d-binary-rfp@web3D.org.
This call was released 29 July 2003 at the start of SIGGRAPH 2003.
The X3D Working Group is developing the Extensible 3D (X3D) Graphics Specification as a componentized and extensible evolution of the Virtual Reality Modeling Language (VRML 97) standard.
The X3D Abstract Specification (IISO/IEC 19775-1) is now advanced as an ISO Draft International Specification. No further functional changes are allowed in this version of the specification, thus enabling significant optimization of corresponding compression algorithms.
X3D includes multiple encodings that consistently implement the same abstract-functionality specification. The Extensible Markup Language (XML) and Classic VRML encodings are currently defined. The forthcoming X3D Compressed Binary Encoding will also fully implement X3D capabilities.
In order to address needs of X3D user constituencies in the context of the above developments, the X3D Task Group has developed the following requirements and Request for Proposals (RFP).
The X3D Task Group has established the following overall requirements for binary encoding:
Extensive work has gone into proving the concept of binary structure for the X3D scene graph. The NPS Cross-Format Schema Protocol (XFSP) has been developed as a general approach to binary serialization of XML documents. Yumetech and Media Machines have also developed prototyped X3D tokenized binary formats. The X3D Specification Team expects to use the results of these efforts, and others as appropriate, to provide the basis of a format definition for automatically serializing and deserializing scene graph structure, through X3D node and field tokenization. The technologies underlying these development efforts are well documented and are to be submitted on a Royalty Free (RF) basis.
For the forthcoming scene-graph serialization/deserialization algorithms, two open-source implementations in Java will be provided by Yumetech and NPS. A third open-source implementation in C++ will be provided by MediaMachines. Further private or public implementations are welcome.
Technical improvements to XFSP that specifically support X3D optimization will be performed during the conduct of this work. Additionally, should the World Wide Web Consortium (W3C) commence work to produce a formal recommendation for XML serialization, we will consider how to adapt to (or adopt) such work.
Of particular interest in this RFP are proposals for definition of default compression algorithms corresponding to each of the various X3D data types. Proposals that address only some of the data/node types, as well as proposals that address broad comprehensive approaches, and even alternative scene-graph serialization techniques, are all encouraged. Proposals not selected as default algorithms may yet remain suitable as alternative compression algorithms, since the compressed binary encoding will be extensible.
Scene-markup capabilities will also be provided for defining alternative compression algorithms, using mechanisms similar to those defined by the W3C Recommendations for XML Encryption and XML Signature.
All parties that hold relevant technology satisfying one or more of these requirements are invited to submit proposals for consideration by the X3D Specification Team and X3D Working Group. Submitting parties do not necessarily have to be members of the Web3D Consortium.
The X3D specification team accepts responsibility for considering and integrating diverse input contributions. We will produce an appropriate extensible binary compressed geometry encoding, and present that X3D solution back for further consideration, implementation and evaluation.
Due date for submissions: 1 November 2003, sent by email to X3D Specification Team at x3d-specification@web3D.org
Responses to the RFP should include specific information on the following:
In keeping with existing Web3D policy and practice, preference will be given to technologies without IPR encumbrances. Two implementations, including at least one in open source, will eventually be required for adoption.
Proposals and their implementations accepted for consideration by the X3D Specification Team and X3D Working Group will be rapidly advanced for evaluation as X3D "Phase 3: Implementation and Evaluation" submissions (see X3D Specification Process).
The ultimate goal of this effort is to submit the entire compressed binary encoding to ISO as part three of the X3D Encodings specification (ISO/IEC 19776).
|X3D Task Group and Web3D Consortium authorizes X3D Compressed Binary Encoding requirements and RFP|
|Technology submissions received and considered|
|Draft solution by X3D Specification Team offered for review and comment by X3D Contributors and Web3D Consortium||March 2004|
|One or more example implementations presented at Web3D 2004 Symposium|
|Milestone dates for ISO submission decided|
Last revised: 18 August 2003.
Online at http://www.web3D.org/TaskGroups/x3d/X3dBinaryRFP.html
© 2003 Web3D CONSORTIUM