Subject:
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Re: icosahedron in soccer-ball style
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Newsgroups:
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lugnet.build.sculpture
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Date:
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Mon, 15 Sep 2003 13:38:56 GMT
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Viewed:
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905 times
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In lugnet.build.sculpture, Philippe Hurbain wrote:
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Hi John,
Sure I do !
You say in
brickshelf text “But for some reason I didn’t realize that the flat faces of
the pentagons would line up with the ajoining hexagon” Actually the problem
is that triangle in the pentagons should not be equilateral. The vertices
inside the triangle should be shorter than outside vertices , 3.4 studs
instead of 4 to be precise. I think that if you manage to build triangles
that are 4 studs / 3.5 studs / 3.5 studs, the resulting thing will be much
closer to a soccer ball
(truncated
icosaedron)
Cheers,
Philo
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Yup, I realize that now. Holding the big ball in your hands can really make
those ideas clear! The problem is, how to do it within the limits of the “Lego
System”?
I want to experiment with other triangle sizes, and see what happens and what
other shapes I could build. I think making the black triangles 6/5/5 might
flatten out the pentagons enough to make it more spherical. Of course, the
hexagons might have to be made of triangles 6/7/7 -- at this rate the sphere
will end up being a lot larger than I originally intended! But, that’s half the
fun, you know... *grin*
JohnG, GMLTC
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Message has 2 Replies:
 | | Re: icosahedron in soccer-ball style
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| (...) Originally I thought of using 2x1 plates with one stud to get a 1/2 stud value, but your 6/5/5 idea is probably (much) better. The precise value is 6/5.1/5.1 so here the pentagons will be taut and flat. There is probably enough slack in the (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
| | | Re: icosahedron in soccer-ball style
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| (...) I don't have the parts to try this out, so my suggestion may be highly disposable. How about making each black triangle a 4/3/4? By this I mean: each black/white join would be 4/4, and each black/black join would be 4/3. The pentagon wouldn't (...) (21 years ago, 16-Sep-03, to lugnet.build.sculpture, FTX)
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Message is in Reply To:
| | Re: icosahedron in soccer-ball style
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| Hi John, (...) Sure I do ! You say in (URL) text> "But for some reason I didn't realize that the flat faces of the pentagons would line up with the ajoining hexagon" Actually the problem is that triangle in the pentagons should not be equilateral. (...) (21 years ago, 15-Sep-03, to lugnet.build.sculpture, FTX)
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