[x3d-public] X3D4 updates: MultiTexture validation, X3DUOM, Java, Python, Turtle

[Brutzman, Donald (Don) (CIV)]

Extensible 3D (X3D) Graphics is the royalty-free open standard for publishing, viewing, printing and archiving interactive 3D models on the Web.

Here are recent updates.  Had some good refinements related to MultiTexture, now rippled out through all of the open-source autogenerated software builds.


  1.  X3D XML Schema update activity, addressing some scene validation issues:
https://www.web3d.org/specifications/x3d-schema-changelog.txt

25 SEP 2021, brutzman
- (v3.1-v4.0) MultiTexture texture field has type X3DSingleTextureNode and can include
  ComposedCubeMapTexture, GeneratedCubeMapTexture, ImageCubeMapTexture,
  ComposedTexture3D, ImageTexture3D, PixelTexture3D
- (v3.1-v4.0) MultiTextureCoordinate is part of ComposedGeometryContentModel
- (v4.0) allow X3DComposedGeometryNode texCoord field to include
  X3DSingleTextureCoordinateNode|MultiTextureCoordinate
- (v4.0) allow watchlist containerField for backwards compatibility of X3D models in
  containerFieldChoicesAudioClip

Corresponding changes added to X3D XML DOCTYPE as appropriate.  All details found at


  *   X3D Specifications: Schema and DOCTYPE Validation
  *   https://www.web3d.org/specifications


  1.  X3D XML Schema changes are applied to the X3DUOM, which then in turn is applied via XSLT conversion stylesheets to create multiple coding projects.


  *   X3D Unified Object Model (X3DUOM)
  *   https://www.web3d.org/specifications/X3DUOM.html
  *   https://www.web3d.org/specifications/X3dUnifiedObjectModel-4.0.xml

“The X3D Unified Object Model (X3DUOM) is a full set of object-oriented interfaces for all nodes, fields and statements in the X3D Architecture Specification.”

Each of the following codebase updates passed respective sets of unit tests and conversions using the test scenes (nearly 4000 total).


  *   X3D Resources, Examples: Scene Archives for X3D
  *   https://www.web3d.org/x3d/content/examples/X3dResources.html#Examples


  1.  JAVA X3DJSAIL API


  *   X3D Java Scene Access Interface Library (X3DJSAIL)
  *   http://www.web3d.org/specifications/java/X3DJSAIL.html

“X3D Java Scene Access Interface Library (X3DJSAIL) supports programmers with standards-based X3D Java interfaces and objects, all as open source.”


  1.  Python X3DPSAIL API


  *   X3D Python Scene Access Interface Library (X3DPSAIL)
  *   https://www.web3d.org/x3d/stylesheets/python/python.html


  *   Python x3d.py package
  *   https://pypi.org/project/x3d

“The x3d.py Python X3D Package supports programmers with Python interfaces and objects for standards-based X3D programming, all as open source.”

Design Features


  *   The current implementation strives to follow first principles of python package design, being as "pythonic" as possible. Creating a native-Python implementation for X3D data structures appears to provide the greatest possible portability.
  *   Python is exceedingly rigorous regarding design and implementation, demands crisp readability, and often leads to a single best approach for each programming task. These are valuable features that lead to ease of programming and greatly reduced debugging. A single well-constructed open-source Python X3D implementation has the potential to serve all Python distributions and programmers well.


  1.  X3D Ontology


  *   X3D Ontology for Semantic Web
  *   https://www.web3d.org/x3d/content/semantics

“The X3D Ontology for Semantic Web provides terms of reference for semantic query of X3D models.”

Steady work continues.  All feedback welcome.  Have fun with X3D4!   8)

all the best, Don
--
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman

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