[x3d-public] glTF asset metadata support

[Andreas Plesch]

There is currently an industry effort to define better structured metadata
discussed here:

https://github.com/KhronosGroup/glTF/pull/1553

This effort follows the XMP standard used for some media.

I believe for x3dom we made an attempt to preserve metadata when inlining
gltf. Yes, here is the relevant translation in code:

https://github.com/x3dom/x3dom/blob/16cdee773c81f388c4b46b8aae76384a59dd1ecd/src/util/glTF/glTF2Loader.js#L55-L157

The asset info goes into a worldinfo, and extras for other items go into
metadata.




Date: Thu, 2 Jan 2020 09:08:13 -0800
> From: Don Brutzman <brutzman at nps.edu>
>
>
> Great metadata discussion on the weekly Design Printing Scanning
> teleconference.
>
> We decided to specifically call out that any metadata in a glTF asset
> (model) needs to get loaded as X3D metadata.
>
> Feedback and improvements welcome.
>
> ================================================
>
> Mantis issue 1272: glTF import needs to include metadata import
> https://www.web3d.org/member-only/mantis/view.php?id=1272
>
> When loading a glTF model, whatever metadata might be embedded needs to
> appropriately converted into X3D head/meta elements or Metadata* nodes as
> well.
>
> Reference:
> - - - - - - - - - - - - - - - - - - - - - - - - -
> glTF asset: Metadata about the glTF asset.
> https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#asset-1
> Properties Type Description Required
>
> * copyright string A copyright message suitable for display to credit the
> content creator. No
>
> * generator string Tool that generated this glTF model. Useful for
> debugging. No
>
> * version string The glTF version that this asset targets. ? Yes
>
> * minVersion string The minimum glTF version that this asset targets. No
>
> * extensions object Dictionary object with extension-specific objects. No
>
> * extras any Application-specific data. No
>
> Additional properties are allowed.
> - - - - - - - - - - - - - - - - - - - - - - - - -
>
> 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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