[x3d-public] Blender 3.0 import/export of HelloWorld.x3d

[John Carlson]

There’s something with line 364 of io_utils.py I tried to patch.   With
that exception being tested for (thanks Don for your suggestion on the
python error), I got decimated textures in all later round trips, in all
collada, fbx, glTF and X3D. I tried running the .x3d in a browser under
both X_ITE and X3DUOM—no luck.

At this point I don’t know how to replace the texture in the exported X3D,
 but it’s likely one can replace decimated textures (data url?), but
without a url attribute, this is more difficult.   If you have multiple
textures, which do you replace if there’s no names to your images?

So the good news is, export textures are somewhat working for me (in
blender) but changes to the exported textures to add a comment with the
image file name in it would be welcome.   Ideally one should be able to
configure export to add url attributes instead of using decimated textures.
  So don’t provide images, just provide a spot to put a file name in.  Make
it optional.  Note, I’m a blender noob.

So one can patch the loop in io_utils.py by testing if the iterable is
None,  but you might get decimated images.  A way forward is to test
exports of unpatched versions of blender.   If all exports show decimated
textures, then Blender team has work which X3D may benefit from.

I may need to upgrade my blend file.   I recommend starting with a fresh
cube and a text to adequately test this deficiency.   I believe Don did
this.   The Blender file may have historical issues that newer version may
deprecated

John



On Wed, Dec 29, 2021 at 11:03 PM Brutzman, Donald (Don) (CIV) <
brutzman at nps.edu> wrote:

> Blender 3.0 is released, online at
>
>
>
>    - https://blender.org
>
>
>
> Tried to import HelloWorld.x3d
>
>
>
>    - https://www.web3d.org/x3d/content/examples/HelloWorld.x3d
>
>
>
> That seemed to work, result is large (4KB grew to 835KB) and so pushed
> online at
>
>
>
>    -
>    https://x3dgraphics.com/examples/X3dForAdvancedModeling/HelloWorldScenes/HelloWorldImportBlender.blend
>
>
>
> However exporting back to X3D failed, with Blender console not providing
> copyable text, screenshot of traceback attacked.
>
>
>
> Wondering if anyone with Blender skills can figure out what is wrong?
> Likely we should submit a bug report to Blender.  TIA for all
> troubleshooting.
>
>
>
> 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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> x3d-public at web3d.org
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>
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