[x3d-public] 3D Working Group agenda 23 FEB 2023: progress reports, proposed Metaverse group, glTF extensions, X3D 4.1 feature discussion

[Andreas Plesch]

KHR_lights_environment is at this point a proposal:

https://github.com/KhronosGroup/glTF/pull/1956

Not sure what the relation is to EXT_lights_image_based :

https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Vendor/EXT_lights_image_based

-Andreas

On Fri, Feb 24, 2023 at 1:16 PM Michalis Kamburelis
<michalis.kambi at gmail.com> wrote:
>
> From others:
>
> 1. Blender: they support a number of extensions at import and export:
> https://docs.blender.org/manual/en/dev/addons/import_export/scene_gltf2.html#extensions
>
> 2. CGE supports ( https://castle-engine.io/gltf ):
>
> - KHR_materials_unlit - unlit materials. This translates nicely to
> X3D4 UnlitMaterial.
>
> - KHR_lights_punctual - define lights (point, spot, directional)
> within glTF file. These translate nicely to X3D lights (with unbounded
> intensity in X3D4).
>
> - KHR_texture_transform - transform (scale, offset, rotate) texture
> coordinates. These translate to X3D texture coordinate transformation
> nodes.
>
> - KHR_materials_pbrSpecularGlossiness - support for alternative
> specification of material parameters using specular-glossiness. Only
> partial support — without textures. Extension considered deprecated by
> Khronos in favor of KHR_materials_specular.
>
> My most important plans:
>
> - X3D nodes for binary meshes (I know X3DOM has this already) and then
> KHR_draco_mesh_compression
>
> - EnvironmentLight in X3D4, consistent with EXT_lights_image_based ,
> KHR_lights_environment .
>
> 3. Everyone: As you see, there is a big overlap between all these
> extension lists (X3DOM, Blender, CGE) and that's good :)
>
> Some glTF extensions are quite popular and in practice supported by
> all/most glTF viewers.
>
> Regards,
> Michalis
>
> pt., 24 lut 2023 o 17:56 Andreas Plesch <andreasplesch at gmail.com> napisał(a):
> >
> > On glTF extension below:
> > >
> > > ...
> > > 4.      glTF Extensions.
> > >
> > > Recent email threads have pointed out that X3D 4.0 normatively references
> > > glTF 2.0.  Meanwhile numerous glTF extensions are available.  Nothing
> > > prohibits X3D browsers/players/tools from going beyond baseline glTF 2.0 -
> > > the "X" in X3D is Extensible.  8)
> > >
> > > There is benefit to software developers, content authors and end users to
> > > having a shared strategy on what new features to support.  Considering and
> > > supporting such a list is further suitable as a Web3D Recommendation as a
> > > stepping stone towards future pursuit of X3D 4.1 with International
> > > Standards Organization (ISO).
> >
> >
> > >
> > > Here are a few glTF extensions that have been proposed.  Let's discuss which
> > > have high value and deserve consideration as part of a shared strategy.
> > >
> > >
> > >
> > > *       EnvironmentLight
> > > *       emissiveColor bloom
> > > *       Draco geometry compression
> > > *       Human animation
> > > *       Others?
> > >
> >
> > x3dom supports a few extensions:
> >
> > "KHR_materials_pbrSpecularGlossiness", (now deprecated and replaced by
> > KHR_materials_specular)
> > "KHR_materials_unlit",
> > "KHR_texture_transform"
> >
> > Soon it will also support Draco decompression.
> >
> > KHR prefixed extensions are sanctioned by Khronos.
> >
> > Here is a complete list:
> >
> > KHR_draco_mesh_compression
> > KHR_lights_punctual
> > KHR_materials_clearcoat
> > KHR_materials_emissive_strength
> > KHR_materials_ior
> > KHR_materials_iridescence
> > KHR_materials_sheen
> > KHR_materials_specular
> > KHR_materials_transmission
> > KHR_materials_unlit
> > KHR_materials_variants
> > KHR_materials_volume
> > KHR_mesh_quantization
> > KHR_texture_basisu
> > KHR_texture_transform
> > KHR_xmp_json_ld
> >
> > KHR_lights_punctual may be feasible to support, and KHR_xmp_json_ld is
> > about metadata and also should be possible to translate to Metadata
> > nodes.
> >
> > EXT_lights_image_based is a multi-vendor extension related to EnvironmentLight
> >
> > -Andreas
> >
> >
> > >
> > >
> > >
> > >
> > > 5.      X3D 4.1 feature discussion. (carried over from last week)
> > >
> > >
> > >
> > > Many possibilities!  The "X" in X3D is Extensible, so pursuit of further
> > > evolution is an essential part of our design.  We benefit from (but are not
> > > limited by) ISO stability, since implementers can experiment with innovative
> > > practices and also match Web3D Consortium recommended practices.
> > >
> > >
> > >
> > > a.      Near term: resolving Sound component differences with Web Audio API.
> > > Some noted issues will likely get deferred as X3D 4.1 issues.
> > > b.      In progress: HAnim2/X3D4 additions for site names, poses, and
> > > clothing to provide support for apparel.
> > > c.      What else? What's next?
> > >
> > >
> > >
> > > Wishing best progress.  Have fun with X3D!  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 https://
> > > faculty.nps.edu/brutzman
> > >
> > >
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> > --
> > Andreas Plesch
> > Waltham, MA 02453
> >
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-- 
Andreas Plesch
Waltham, MA 02453