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

Fri Feb 24 10:32:35 PST 2023

X_ITE supports the following extensions:

- KHR_materials_unlit implemented with PhysicalMaterial because of gamma correction.

- KHR_materials_emissive_strength - implemented by adding emissiveStrength field to X3DOneSidedMaterialNode.

- KHR_lights_punctual - mapped to Point/Spot/DirectonalLight

- KHR_texture_transform - mapped to X3D TextureTransform

- KHR_materials_pbrSpecularGlossiness - not really supported, without a SpecularGlossinessMaterial node there will be no real support, but PhysicalMaterial is more straightforward.

Best regards,
Holger

> Am 24.02.2023 um 19:15 schrieb Michalis Kamburelis <michalis.kambi at gmail.com>:
> 
> 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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