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

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(primary source instead of secondary everchanging "source")
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** Patented technologies can be considered, but only when eventual use will be royalty free for X3D use (if eventually accepted).
 
** Patented technologies can be considered, but only when eventual use will be royalty free for X3D use (if eventually accepted).
 
** Submitters can restrict access to patented submissions during member-only working group review, if desired.
 
** Submitters can restrict access to patented submissions during member-only working group review, if desired.
 +
 
* TODO: Use cases and test examples can demonstrate whether http/https and local-file url retrieval are sufficient for a network protocol.
 
* 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.
 
** Other network protocols (Web sockets, P2P channels, etc.) might be possible, but only if security restrictions can be handled satisfactorily.
 +
* Javascript Object Notation (JSON) might be suitable for simple streaming of X3D scene-graph data via Script node or external HTML page, which can be useful for progressive mesh and other incremental network-update approaches
  
 
== X3D Implementations ==
 
== X3D Implementations ==

Revision as of 15:41, 20 March 2013

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

X3D appears to have have an 80% solution already available that meets various requirements for a general 3D transmission format.

  • TODO: We are updating this page and creating a draft 2013 Call For Contributions to further progress these technical capabilities for X3D.

Existing Compression Usage for X3D and VRML97

  • Approved ISO standard Compressed Binary Encoding (CBE) for X3D.
  • Optional, alternative gzip compression and MIME Type definitions for X3D.
  • Optional, alternative gzip compression for VRML97.
    • Original compression technique of applying gzip to .wrl compressed VRML97 files was called .wrz.
    • This emerged as a common practice when gzip was originally used. No formal specification of .wrz or corresponding mime type was produced.
    • Occasionally authors might also gzip .wrl files while retaining the .wrl file extension.

Polygon Reduction and Geometric Compression

Formal specifications:

Best practices:

Data-Centric Binary Encodings

Network Streaming

  • Multiple capabilities are already available in X3D 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. Note however that an effective progressive-mesh approach is likely dependent on the availability of a corresponding mesh compression algorithm.
  • 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 access to patented submissions during member-only working group review, 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.
  • Javascript Object Notation (JSON) might be suitable for simple streaming of X3D scene-graph data via Script node or external HTML page, which can be useful for progressive mesh and other incremental network-update approaches

X3D Implementations

The following tools implement the X3D Compressed Binary Encoding (CBE) standard.

Looking Ahead

  • Web3D's X3D and CAD Working Groups each have member commitments to pursue this continued innovative work in 2013.
  • TODO: An open workshop on 3D Transmission Formats might be a thorough way to compare candidate technologies to complete these capabilities.
  • Consider common, sharable technical strategies with MPEG-4 and Collada.