Difference between revisions of "X3D Binary Compression Capabilities and Plans"

Revision as of 02:07, 15 December 2011

Synopsis. Lots of work has been accomplished towards proper support of X3D Binary Compression for a wide variety of potential uses.

Standards and implementations
- Approved ISO standard Compressed Binary Encoding (CBE) for X3D
- .x3db file extension
- Based on ISO standard Fast Infoset (FI) for XML compression
- Two independent open-source implementations available
  - C++ codebase: XIOT X3D Input Output Tool library
  - Java codebase: Xj3D
  - Ongoing status: Player_support_for_X3D_components and Tool_support_for_X3D_components
- Several thousand X3D Examples available in .x3db form, encoded by Xj3D
  - TODO: Plan to similarly automate conversions with XIOT for cross-check validation testing

Polygon reduction
- CAD Distillation Filter (CDF) technique allowing successive refinement of large X3D scenes into tighter X3D scenes
- Extensible, repeatable compression-decompression data flow/production chains
- Multiple filters implemented in open-source Xj3D and X3D-Edit
- Multiple other conversion and translation tools available with supporting capabilities
- X3D Canonicalization (C14N) provides standardized formatting so that digital signatures are not thwarted by whitespace variations

Binary encodings
- Plan to add a further-improved X3D Compressed Binary Encoding using now-approved W3C Recommendation for Efficient XML Interchange (EXI)
- Web3D contributed to EXI working group and XML Binary Characterization working group efforts, ensuring that 3D Model Compression, Serialization and Transmission use-case requirements are defined and met
- Design includes compatibility with CDF techniques, XML Encryption, and XML Digital Signature for author authentication
  - Relevant example scenes maintained as part of X3D Basic Examples Archive - Security
- This meets most needs of digital authors for digital rights management

Networking
- Several capabilities are available for flexible network transmission
- Anchor, Inline, LOD, LoadSensor, Script and Prototype nodes support successive retrieval of content once initial model is displayed
- TODO: Willing to consider further addition of progressive-mesh geometric streaming technologies, perhaps by a public Call for Contributions
  - For example, the original X3D Compressed Binary Encoding Request For Proposals (RFP)
- Intellectual Property Rights (IPR) protections for X3D specification
  - Patented technologies can be considered, but only when eventual use will be royalty free for X3D use (if eventually accepted)
  - Submitters can restrict patented submissions to working group while under consideration, if desired
- TODO: Use cases and test examples can demonstrate whether http/https and local-file url retrieval are sufficient for a network protocol
  - Other network protocols (Web sockets, P2P channels, etc.) might be possible, but only if security restrictions can be handled satisfactorily

Looking ahead
- Web3D's X3D and CAD Working Groups each have member commitments to pursue this continued innovative work in 2012
- TODO: A workshop might be a rapid way to compare candidate technologies that might complete these capabilities
- X3D appears to have have an 80% solution already available that meets various requirements for a general 3D transmission format

@@ Line 30: / Line 30: @@
 ** Anchor, Inline, LOD, LoadSensor, Script and Prototype nodes support successive retrieval of content once initial model is displayed
 ** TODO: Willing to consider further addition of progressive-mesh geometric streaming technologies, perhaps by a public Call for Contributions
+*** For example, the original [http://www.web3d.org/x3d/binary/X3dBinaryRFP.html X3D Compressed Binary Encoding Request For Proposals (RFP)]
 ** [http://www.web3d.org/realtime-3d/about/legal Intellectual Property Rights (IPR)] protections for X3D specification
 *** Patented technologies can be considered, but only when eventual use will be royalty free for X3D use (if eventually accepted)