[X3D-Ecosystem] Can I release mobius.x3d to sourceforge.net?

[John Carlson]

What should we call it?  The Marchetti Loop?

John

On Sat, Aug 2, 2025 at 11:55 AM vmarchetti--- via X3D-Ecosystem <
x3d-ecosystem at web3d.org> wrote:

> Holger, I agree with you, after my carefui examination of a 3-D printing
> of this:
>
> [image: corks.jpg]
>
> Described as an extrusion, this would be an extrusion of an equilateral
> triangle around a closed loop, with a rotation of
> the cross-section by 120 degrees over the loop.
>
> Vince
>
>
>
> On Aug 2, 2025, at 10:53 AM, Holger Seelig via X3D-Ecosystem <
> x3d-ecosystem at web3d.org> wrote:
>
> Sorry, but this is not a Möbius strip (denote the point above the o),
> because the rotation of the strip (crossSection) is 360 degrees, but there
> should only be a rotation about 180 degrees.
>
> The orientation field of the Extrusion node should better hold these
> values:
>
> 0 1 0 0,
> 0 1 0 0.130899693899575,
> 0 1 0 0.261799387799149,
> 0 1 0 0.392699081698724,
> 0 1 0 0.523598775598299,
> 0 1 0 0.654498469497874,
> 0 1 0 0.785398163397448,
> 0 1 0 0.916297857297023,
> 0 1 0 1.0471975511966,
> 0 1 0 1.17809724509617,
> 0 1 0 1.30899693899575,
> 0 1 0 1.43989663289532,
> 0 1 0 1.5707963267949,
> 0 1 0 1.70169602069447,
> 0 1 0 1.83259571459405,
> 0 1 0 1.96349540849362,
> 0 1 0 2.0943951023932,
> 0 1 0 2.22529479629277,
> 0 1 0 2.35619449019235,
> 0 1 0 2.48709418409192,
> 0 1 0 2.61799387799149,
> 0 1 0 2.74889357189107,
> 0 1 0 2.87979326579064,
> 0 1 0 3.01069295969022,
> 0 1 0 3.14159265358979
>
> Follow a plane or a edge of the strip and you will see that now it has
> only one of them.
>
> Here is a direct comparison of both of the strips:
>
> https://create3000.github.io/x_ite/playground/?url=https://create3000.github.io/Library/Tests/Components/Extrusion/M%C3%B6bius.x3d
>
> Please also have a look at the Wikipedia page:
> https://en.wikipedia.org/wiki/M%C3%B6bius_strip
>
> Best regards,
> Holger
>
> —
> Holger Seelig
> holger.seelig at yahoo.de
>
>
> Am 01.08.2025 um 20:15 schrieb Don Brutzman via X3D-Ecosystem <
> x3d-ecosystem at web3d.org>:
>
> Online, open source, in version control at SourceForge:
>
>    - X3D Example Archives: X3D4AM, X3D for Advanced Modeling, Geometric
>    Shapes, Mobius Extrusion
>    - Mobius (or Mobius) is a surface with only one side and only one
>    boundary component.
>    -
>    https://www.web3d.org/x3d/content/X3dForAdvancedModeling/GeometricShapes/MobiusExtrusionIndex.html
>
> Vince, didn't that get derived from something you originally did?
> Apologies if further provenance information is needed, if so then please
> advise and let's add it.
>
> all the best, Don
>
> On Fri, Aug 1, 2025 at 5:35 AM Vincent Marchetti via X3D-Ecosystem <
> x3d-ecosystem at web3d.org> wrote:
>
>> John
>>
>> Yes, you can use the file for a ticket submission
>>
>> Vince Marchetti
>>
>>
>> > On Aug 1, 2025, at 7:55 AM, John Carlson via X3D-Ecosystem <
>> x3d-ecosystem at web3d.org> wrote:
>> >
>> > Vince,
>> >
>> > Can I release mobius.x3d to the x3d tickets on sourceforge?  I sent you
>> email, probably too early!
>> >
>> > I’d like to get X3dToJson.xslt fixed, and stuff added to the X3DJSAIL
>> DOM loader.  Apparently, LineSets and NurbsPatchSurface need to be listed
>> in a humoungous set of if then else if statements as children of Shape.  I
>> don’t know why they aren’t in dispatch table(s), probably the branch
>> prediction on the CPU is wild.  Maybe Java’s Jackson APIs could supplant it.
>> >
>> > Here are a few of my type and method lookup tables.  They aren’t
>> perfect!
>> >
>> > Michalis, could I use these for data driving the JSON to X3DNode thing
>> in Pascal?  At least a first cut?
>> >
>> >
>> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/fieldTypes.js
>> >
>> >
>> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/mapToMethod.js
>> >
>> >
>> >
>> https://github.com/coderextreme/X3DJSONLD/blob/master/src/main/node/mapToMethod2.js
>> >
>> > Overrides the former.
>> >
>> >
>> > Thanks,
>> >
>> > John
>> > --
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>>
>>
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