[X3D-Ecosystem] X3D (JSON) to PLY and STL (tessellation)

[John Carlson]

And yes, I saw all the errors that X3dToJson.xslt threw, apparently.
Luckily, I used x3d-tidy by renaming the output extension

On Sun, Jul 27, 2025 at 6:53 AM John Carlson <yottzumm at gmail.com> wrote:

> Very good example.  I tried to load it into Sunrize, failed.  Castle Model
> Viewer reported 4 errors, fixed those.  still wouldn't view in Sunrize.
> Tried to convert to JSON with x3d-tidy.  I used the wrong output file
> extension, it's .x3dj.   Tried to use X3DJSAIL's CommandLine to validate,
> borked, typical containerField issues (this is hardcoded in the stylesheet,
> I can probably fix X3DJSAIL for you, let me know.  It's a very typical
> error in X3DJSAIL:  Note that this has nothing to do with
> setContainerFieldOverride() in any other Java except X3DSAIL.
>
> java -cp "../../../X3DJSAIL.4.0.full.jar" org.web3d.x3d.jsail.CommandLine
> -validate ../data/mobius.x3d
> CommandLine parameter: "-validate" for model validation
> parameter: source file mobius.x3d filesize 42115 bytes
> Parsing using Document Object Model (DOM) based X3DLoaderDOM...
> Exception in thread "main" org.web3d.x3d.sai.InvalidFieldValueException:
> *** Invalid setContainerFieldOverride() value='controlPoint', legal values
> for Coordinate are containerField_ALLOWED_VALUES='"coord" "skinCoord"
> "skinBindingCoords"'
>         at
> org.web3d.x3d.jsail.X3DConcreteNode.setContainerFieldOverride(X3DConcreteNode.java:424)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:633)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:621)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:621)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:621)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:492)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.toX3dModelInstance(X3DLoaderDOM.java:455)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.loadModelFromFileX3D(X3DLoaderDOM.java:249)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.loadModelFromFileX3D(X3DLoaderDOM.java:233)
>         at
> org.web3d.x3d.jsail.X3DLoaderDOM.loadModelFromFileX3D(X3DLoaderDOM.java:207)
>         at org.web3d.x3d.jsail.CommandLine.run(CommandLine.java:924)
>         at org.web3d.x3d.jsail.CommandLine.main(CommandLine.java:244)
>
> So here's the two files.  I will work with AI next.
>
> Nice picture from X3DJSONLD (no AI yet).
> [image: image.png]
>
> On Sun, Jul 27, 2025 at 5:46 AM vmarchetti--- via X3D-Ecosystem <
> x3d-ecosystem at web3d.org> wrote:
>
>> In response to "What I really need are X3D examples with a variety of
>> shapes" here's a doughnut constructed out of NurbsPatchSurface nodes, if
>> you pay attention to the obvious faces and edges it's a mobius strip folded
>> on itelf three times and the edge sewn together.
>>
>> Vince Marchetti
>>
>>
>>
>> On Jul 27, 2025, at 5:24 AM, John Carlson via X3D-Ecosystem <
>> x3d-ecosystem at web3d.org> wrote:
>>
>> I've done some work with PLY and STL converting to and from X3D JSON with
>> my simple examples on X3DJSONLD 12.  I'd like to expand the geometry which
>> I can convert from X3D JSON to STL and PLY.  I've found https://ai.dev
>> quite useful for tessellation in JavaScript, so I'm going to rely on it
>> more.  For example, it mostly figured out how to tessellate a Sphere.
>>
>> What I really need are X3D examples with a variety of shapes. I recently
>> saw that Holger's Connectors.x3d did not translate to STL or PLY (probably
>> no surprise).  I have not tried the Castle Model Converter yet.  If anyone
>> has a scenegraph that presents an X3D Catalog, that would be useful!
>>
>> I'm guessing that X_ITE and X3DOM can tessellate to geometry render, so
>> it's probably easy enough to extract the code from there and use it to
>> output triangles and material to STL and PLY.  An alternative is to convert
>> Pascal code to JavaScript using Pas2Js and use Michalis' X3DNode to STL
>> converter.
>>
>> If such code appears in my lap, I would be extremely happy.
>>
>> This is all for the "bake-off" I've been planning.
>>
>>
>> John
>> --
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>>
>>
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>>
>
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