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

[Holger Seelig]

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 <mailto: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 <mailto: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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