[x3d-public] X3D Blender write to file. HAnim

[John Carlson]

Problem with Blender I/O solved.  I also found a "command-line Blender"
that is very helpful.

$ /c/Program\ Files/Blender\ Foundation/Blender\ 3.6/blender.exe
--background --python your_file.py

I was able to pull out skin weights and joints, or something resembling
them.  I realize that these are available in glTF.  Other people are doing
glTF parsing.

Thanks for being patient.

John

On Wed, Sep 13, 2023 at 2:23 AM John Carlson <yottzumm at gmail.com> wrote:

> If you’re not interested in the subject, please ignore this message.  This
> is merely a dump from this afternoon’s experiments with Blender.
>
> Ultimately, what I am trying to do here is build a skeleton graph from
> bones, for use on other projects.  This may be done.
>
> First off, I have been having issues with Blender Scripting file I/O.  I’m
> mostly focusing this paragraph on Doug’s experience.  I don’t want to file
> a bug yet, because I need to explore developer resources, like chat.  I
> have tried searching on Internet.  Something that seems possible, that I
> haven’t tried yet is redirecting console messages to a file. Another is
> copying a shortcut to Blender.exe to your home folder and launching it from
> there, then writing to a log.  I have tried launching from a Windows
> shortcut in my home folder.  I have Python  code if someone wants to try
> their hand at this.
>
> Because of these hoops beyond standard python, I consider modifying a
> plugin instead.  I realize this is a much higher level of complexity.
>
> I am willing to put in effort to at least add HAnim Joints to a Blender
> plugin.  The value added beyond glTF is IndexedFaceSets and real HAnim
> skeletons.  IndexedFaceSets can add quality over what I’ve seen exported to
> glTF. This is achievable currently through a combination of X3D, glTF,
> custom perl, and view3dscene.  It works with 1 model.  I have shared what I
> can, but it’s still roughly done, and model specific, it’s not really
> Blender specific.  I just wanted to see if it was possible.  Now I know
> what is needed for a plugin beyond what is already there.
>
>
> I had been experimenting with exporting HAnim skinCoord info from Blender
> Scripting to a file.  I’ve been trying to get something beyond writing to
> console, because i have over 20000 weights, and I don’t  think copy/paste
> is feasible.  It seems like Blender Python has issues with writing or
> appending to files.  Creating files works okay.
>
> It seems like Blender python has their own I/O package, at least on
> Windows 10.  I feel like I don’t want to try to get around their
> restrictions, if there are any, so I am considering forking the Blender
> plugins branch.  It seems appropriate to fork the Web3D Consortium branch,
> but I will probably fork the main Blender plugin branch listed on the
> github for Web3d.  The Web3d branch is a couple of years behind.
>
> I’m off to chat about Blender and find info.
>
> John
>
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