A 17-faced whatsit...

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Nik_2213
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Joined: Sat Aug 18, 2018 4:22 pm

A 17-faced whatsit...

Post by Nik_2213 » Sat Aug 18, 2018 4:42 pm

Sorry, my Google-fu has drawn a blank on this...

Can Stella net a 'ball' shape consisting of a short, pentagonal prism capped at both ends by a truncated pentagonal pyramid ?

So, it has five parallelogram or square faces, ten trapezoidal faces and two pentagonal ends ??

I'd also like to export it as OBJ, so we're probably talking 'Great Stella'...

Thank you.

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robertw
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Location: Melbourne, Australia
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Re: A 17-faced whatsit...

Post by robertw » Sun Aug 19, 2018 5:51 am

Yes it can, here's how (you need Great Stella for this)
  • Start with a pentagonal prism:
    Image
  • If you want to change the pyramid height before starting, use "Scale->Stretch (Non-Uniform Scale)"
  • Select a pentagonal face
  • Use "Poly->Augment Polyhedron" (keyboard shortcut: a)
  • In the dialog that appears, select these options: Augment using...Prism (everything else can stay as default). You'll see this preview of the augmentation:
    Image
  • Use Ctrl+Right-drag to scale the top of the prism as required:
    Image
  • Use Ctrl+Left-drag if you want to change the height of the augmentation:
    Image
  • When happy, hit Enter to accept the preview as your new model
  • Now you can see nets, eg here it is with the 3D unfolding nets:
    Image

Nik_2213
Posts: 2
Joined: Sat Aug 18, 2018 4:22 pm

Re: A 17-faced whatsit...

Post by Nik_2213 » Tue Aug 21, 2018 10:04 pm

Thank you, thank you.

I have ordered a 'Great Stella'.

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