[X3D-Ecosystem] Castle-model-converter HAnim glTF to X3D

[John Carlson]

This looks like the related issue:

https://github.com/castle-engine/castle-model-viewer/issues/60

Michalis leaves good information there.

The biggest issue with post-processing is the size of the files being
transformed.   I know about how to set —float-precision in the converter,
and I’ll employ that.   I believe I’ve tried a couple of approaches,
combining another source with converter output to identify Joints, which
becomes a time sink development for large HAnim files.

Another approach is to abandon HAnim and go with some alternative
(Transforms), but then we probably have to do a different type of Skin,
which appears to be talked about in link above (I didn’t get into details,
sorry).  It just seems like we’re diverging from the standard, but HAnim
version 2.1 is on the doorstep, so there might be opportunities to adopt
another technique.

Any collaboration on getting x3d-tidy and castle-model-converter working in
cross-browser support welcome!

John

On Mon, Sep 1, 2025 at 2:50 PM John Carlson <yottzumm at gmail.com> wrote:

> Michalis, where are we in respect to converting glTF to X3D with
> castle-model-converter, especially HAnim?  I recall you were going to add
> something to ease post processing into HAnim, but I forgot the details.  I
> am having issues with x3d-tidy output that views in Sunrize, but is all
> stretchy in castle-model-viewer.  I can use
> castle-model-converter, but I lose HAnim in that case, so I’m looking to
> do some post processing.
>
> See the WalkingAlien* models here,
> https://github.com/coderextreme/HAnimUtilityKit, convert glTF to X3D,
> then look for and HAnim in the output.   Joe is pushing for something
> viewable in both Castle and Sunrize, and I don’t have a solution yet, even
> ignoring HAnim (what’s generated from Castle looks horrible in Sunrize as
> well).
>
> I will work on Castle converter stuff probably in a few hours.
>
> I think you probably want a ticket, but I don’t recall the old ticket
> resolution.
>
> Thanks,
>
> John
>
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