[x3d-public] X3D Working Group Minutes, 2 SEP 2022: X3D glTF feature comparison

Fri Sep 2 13:09:33 PDT 2022

I went through the X3D-glTF comparison.  Of note:  X3JSONLD uses EXI-JSON
libraries from the web.   I don’t think there’s a command-line or
server-side EXI-JSON program in X3DJSONLD at this time.   Volunteer efforts
are welcome.

John

On Fri, Sep 2, 2022 at 1:54 PM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> The Extensible 3D (X3D) Working Group coordinates all Web3D Consortium
> technical development efforts.  Working groups are essentially driven by
> the efforts of participants. They focus on issues and technologies that
> produce improvements to our open standards, always achieving results that
> are royalty free for any purpose.  All efforts are geared towards improving
> a coordinated set of steadily evolving ISO standards including X3D Version
> 4.
>
>    - Web3D Consortium Working Groups
>    - https://www.web3d.org/working-groups
>
>
>
> Attendees: Bill Benman, Anita Havele, Dick Puk, Don Brutzman.
>
>
>
>    1. Today we worked to update the following comparison spreadsheet (HTML
>    version below, .pdf also attached).
>
>
>    - Features Comparison X3D 4.0 and glTF 2.0
>    -
>    https://docs.google.com/spreadsheets/d/1x0DnRtg33AuOA_aSl70L41Gq5m6TFt4t/edit#gid=1010586376
>
>
>
> Comments and improvements to these feature comparisons are welcome.  Have
> we expressed everything precisely and correctly?
>
>
>
>
>
>    1. We further considered recent news regarding World Wide Web
>    Consortium (W3C) getting rechartered as a 501c3 non-profit organization,
>    and how that might influence Web3D Consortium which is chartered as a 501c6
>    non-profit organization.
>
>
>    - W3C will become a public-interest non-profit organization. W3C is
>    replacing its original Hosted model and boosting its crucial web standards
>    work.  In the months leading to the launch of a new legal entity in January
>    2023, we will release further details.
>    - https://twitter.com/w3c/status/1542135556007763968
>    - https://www.w3.org/2022/06/pressrelease-w3c-le.html.en
>
>
>
>
>
>    1. Next week we will consider Web3D inputs to a draft Metaverse
>    Standards Forum (MSF) document regarding feature sets for technical
>    interoperability.
>
>
>
> Consortium and community members are welcome to participate.  As usual, we
> meet each Friday.
>
>    - X3D Working Group, Fridays 0900-1000 pacific
>    -
>    https://us02web.zoom.us/j/81634670698?pwd=a1VPeU5tN01rc21Oa3hScUlHK0Rxdz09
>
>
>
> Web3D Consortium membership has value.  Please consider joining to
> maximize your ability to benefit and influence.
>
>    - Join the Web3D Consortium
>    - https://www.web3d.org/join
>
>
>
> Have fun with X3D and glTF!   8)
>
>
>
>
>
> *Features Comparison X3D 4.0 and glTF 2.0*
>
> 2 August 2022
>
> *References*
>
> X3D 4.0 specification
>
> *https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/Architecture.html
> <https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/Architecture.html>*
>
> glTF 2.0 specification
>
> *https://github.com/KhronosGroup/glTF/tree/master/specification/2.0
> <https://github.com/KhronosGroup/glTF/tree/master/specification/2.0>*
>
> IEEE 3D Body Processing Paper
>
> *https://standards.ieee.org/downloads/3DBPWhitePaper.pdf
> <https://standards.ieee.org/downloads/3DBPWhitePaper.pdf>*
>
> IEEE 3DBP Features
>
> *https://docs.google.com/spreadsheets/d/15wCQ8CHJnQD_tmwaRPFfZqBe6KJzE1CzOKd2XOlPL4M/
> <https://docs.google.com/spreadsheets/d/15wCQ8CHJnQD_tmwaRPFfZqBe6KJzE1CzOKd2XOlPL4M/edit#gid=416054782>*
>
> IEEE 3DBP Working Group
>
> *https://standards.ieee.org/develop/wg/3DBP.html
> <https://standards.ieee.org/develop/wg/3DBP.html>*
>
> *Value Proposition*
>
> X3D is a file format allowing 3D scenes to be used by a wide variety of
> applications.
>
> X3D can be used by Web browsers and other viewers, authoring tools, 3D
> Printing applications, text editors, and XML tools.
>
> X3D is the appropriate choice if the primary goal is saving your
> interactive 3D scenes for use over time and multiple applications.
>
> glTF™ (GL Transmission Format) is a specification for efficient
> transmission from server to client.
>
> glTF is the appropriate choice if the primary goal is viewing 3D scenes in
> a Web browser.
>
> *Technology Comparison Summaries*
>
> X3D: A royalty-free open ISO standards file format and run-time
> architecture to represent and communicate 3D scenes and models.
>
> X3D: Data Interchange and Rendering format, useful for both general Web
> deployment and diverse 3D applications.
>
> X3D: Interoperability with other "vertical" functional domains and
> international Web standards.
>
> X3D: Metadata Support is thorough, working groups are currently mapping to
> external metadata vocabularies.
>
> X3D: Stable long-term archival stability and re-usability, two decades of
> proven capability.
>
> X3D: Ensure portability and consistency across multiple file formats,
> programming languages and platforms.
>
> X3D: Forward/backward compatibility and extensibility are specification
> goals that have been demonstrated successfully for 20 years.
>
> X3D: Strong intellectual property rights (IPR) policy, no cost-bearing
> patents allowed, IPR fully aligned with W3C Web standards.
>
> X3D: Strong community, wide industry compatibility, many
> importers/exporters, many standards-organization liaisons.
>
> X3D: Full Inline support for glTF features, especially compressed geometry
> plus advanced lighting model planned for X3D version 4.
>
> glTF is a royalty-free specification for efficient transmission and
> loading of 3D scenes and models.
>
> glTF: Transmission format designed for applications rendering using WebGL
> or OpenGLES.
>
> glTF: A run-time delivery system for highly optimized mesh data for
> rendering, delivered from source to client.
>
> glTF: Always changing to support the fast changing GPU, a delivery system
> for highly optimized mesh data for rendering.
>
> glTF: Backward compatibility, archivability, are not listed as
> specification goals.
>
> glTF: Strong community, good industry support.
>
> *Feature *
>
> *X3D Support v4.0*
>
> *glTF Support (v2.0 binary + ASCII)*
>
> Triangular meshes
>
> Yes
>
> Yes
>
> Points and lines
>
> Yes
>
> Yes
>
> Quad meshes
>
> Yes
>
> No
>
> Primitive shapes: box, sphere, cone, cylinder, text
>
> Yes
>
> No
>
> NURBS curves and surfaces
>
> Yes
>
> No
>
> CAD Structure (assemblies)
>
> Yes
>
> No
>
> Animation (general)
>
> Yes
>
> Yes
>
> Picking (touch/over TouchSensor, PickableGroup)
>
> Yes
>
> Yes
>
> Clipping planes
>
> Yes
>
> Yes
>
> Human animation: skeleton, skin, motion
>
> Yes, including anatomically correct humans
>
> Yes, ad hoc anatomy
>
> Morph targets
>
> HAnim displacers
>
> Yes
>
> Skin/joint animation
>
> Yes
>
> Yes
>
> Scripting
>
> Yes
>
> No
>
> Extensibility by authors (prototype mechanism)
>
> Yes
>
> No
>
> Metadata Structures
>
> Complete support, now mapping vocabularies
>
> Partial, in separate files
>
> Annotation
>
> Planned X3D v4.1; experimental support now
>
> No
>
> Material
>
> Yes
>
> Yes
>
> Physically Based Rendering, advanced lighting
>
> X3D v4.0, matching glTF
>
> Yes (e.g. metallic-roughness model)
>
> Custom Shader
>
> Yes (multiple shader languages supported)
>
> No
>
> Bump mapping
>
> Yes
>
> Yes
>
> Occlusion map
>
> Yes
>
> Yes
>
> Emissive map
>
> Yes
>
> Yes
>
> Normal map
>
> Yes
>
> Yes
>
> Image (2D) texturing
>
> Yes (image files or embedded pixel map)
>
> Yes
>
> Texture mapping
>
> Yes
>
> Yes
>
> Volume (3D) textures, imaging
>
> Yes
>
> No
>
> Movie (2D + time) texturing
>
> Yes (optional support for streaming)
>
> No
>
> Audio
>
> Yes (optional support for streaming)
>
> No
>
> Spatial 3D Audio
>
> Yes
>
> No
>
> Inline
>
> Supports X3D, scripts, glTF
>
> ?
>
> Formats/encodings
>
> ASCII (XML, ClassicVRML, JSON, languages)
>
> Binary & ASCII (JSON based)
>
> Binary: .x3db, Efficient XML Interchange (EXI)
>
> Inline glTF
>
> Security
>
> Yes (optional signature and encryption in XML)
>
> No inherent encryption
>
> (X3D note: collection of animation displacers equivalent to HAnim morph
> target)
>
>
>
>
>
> 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 https://
> faculty.nps.edu/brutzman
>
>
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>
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