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

[John Carlson]

One might check if glTF uses EXI or not, but i guess the equivalent in glTF
to EXI is glb?  I don’t know if glb is ASCII or not, and EXI-JSON is
encoded in ASCII.

Technically EXI-JSON is not really binary, AFAIK, it just looks a whole lot
like it.

John

On Fri, Sep 2, 2022 at 3:09 PM John Carlson <yottzumm at gmail.com> wrote:

> 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
>>
>>
>> _______________________________________________
>> x3d-public mailing list
>> x3d-public at web3d.org
>> http://web3d.org/mailman/listinfo/x3d-public_web3d.org
>>
>
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