[x3d-public] Problem constructing Mobius strip by extrusion of rectangular cross-section

[vmarchetti at kshell.com]

Tony

This sounds like an interesting project for the X3D community to help with.

As a proof of concept, this X-ITE rendering shows it is possible to render Mobius-like geometry in X3D:  https://spri-open-resources.s3.us-east-2.amazonaws.com/trimobius/index.html 

The X3D file that this page is rendering may be retrieved at https://spri-open-resources.s3.us-east-2.amazonaws.com/trimobius/mobius.x3d

If you can share screenshots or webpages with your not-satisfactory results, that may give us some hint as to what's going on, and also sharing code may also help us.

Vince Marchettti
Web3D Consortium



> On Aug 28, 2023, at 1:38 AM, Anthony Judge <anthony.judge at gmail.com> wrote:
> 
> I have a working model of a Mobius strip, but it uses Indexed Faceset
> which I cannot manipulate as I had hoped to do. Basically I want to
> extend the edges of the strip, possibly dynamically.
> 
> So as an alternative I extruded a thin rectangular cross-section along
> a circular spine, but modifying the orientation of each element along
> the spine through 180 degrees.
> 
> This gives a correct result, except that the ends do not meet
> correctly -- the end is offset because it is rotated around the spine.
> This is apparent if I change the orientation through 360 degrees, when
> the ends do connect correctly -- but I have two twists in the strip,
> which is not what I need for a Mobius strip
> 
> I can provide snippets of this simple issue and I can understand how
> the issue is created by using the spine/orientation combination with
> the extrusion.
> 
> Any comments/help?
> 
> Tony
> 
> -- 
> Anthony Judge
> <anthony.judge at gmail.com>
> www.laetusinpraesens.org
> 
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