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Offline oca
 Post subject: What is the name of the shape of a go stone ?
Post #1 Posted: Tue Feb 17, 2015 2:09 am 
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Does anyone knows the name of the shape of a go stone ?
Thanks

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Offline oca
 Post subject: Re: What is the name of the shape of a go stone ?
Post #2 Posted: Tue Feb 17, 2015 2:27 am 
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Oh thanks,... "biconvex" that may be a good starting point for me... I'm trying to draw a stone using the javascript library
"THREE.js", but don't really know where to start... There are examples with cube and sphere, but none with go stones ;)

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Offline Uberdude
 Post subject: Re: What is the name of the shape of a go stone ?
Post #3 Posted: Tue Feb 17, 2015 2:57 am 
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Traditional biconvex stones are fairly close to an ellipsoid, though they may have a more pronounced 'lip' on the equator.

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Offline tj86430
 Post subject: Re: What is the name of the shape of a go stone ?
Post #4 Posted: Tue Feb 17, 2015 3:28 am 
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Uberdude wrote:
Traditional biconvex stones are fairly close to an ellipsoid

And a specific kind of ellipsoid: oblate spheroid

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Offline oca
 Post subject: Re: What is the name of the shape of a go stone ?
Post #5 Posted: Tue Feb 17, 2015 4:51 am 
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Whoaw... what a lovely name...
unfortunatly, there are no ready to use OblateSpheroidGeometry in three.js so for now I will use just Sphere and scale it's z axis... which should be the ellipsoid right ?

Maybe I should post that in Computer GO topic but here is what I get now :

http://www.gocdf.ch/gobook/3D/stone.html

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Offline gowan
 Post subject: Re: What is the name of the shape of a go stone ?
Post #6 Posted: Tue Feb 17, 2015 7:03 pm 
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Lenticular?

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Offline DrStraw
 Post subject: Re: What is the name of the shape of a go stone ?
Post #7 Posted: Tue Feb 17, 2015 7:46 pm 
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gowan wrote:
Lenticular?


Can't lenticular also refer to a concave lens?

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Offline Boidhre
 Post subject: Re: What is the name of the shape of a go stone ?
Post #8 Posted: Tue Feb 17, 2015 8:12 pm 
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DrStraw wrote:
gowan wrote:
Lenticular?


Can't lenticular also refer to a concave lens?


In maths or English? In maths, as far as I can remember lens in the sense of shape only is used for 2d convex-convex shapes and lenticular for a 3d rotation of that shape. In English the usage isn't as precise as that and you have lens referring to convex-concave shapes and others.

Go stones aren't lenticular for the reasons Uberdude said above about elipsoids which lenticular objects are a subset of iirc (many years since I studied this stuff so I could be wrong).

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Offline DrStraw
 Post subject: Re: What is the name of the shape of a go stone ?
Post #9 Posted: Tue Feb 17, 2015 8:20 pm 
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Boidhre wrote:
DrStraw wrote:
gowan wrote:
Lenticular?


Can't lenticular also refer to a concave lens?


In maths or English? In maths, as far as I can remember lens in the sense of shape only is used for 2d convex-convex shapes and lenticular for a 3d rotation of that shape. In English the usage isn't as precise as that and you have lens referring to convex-concave shapes and others.

Go stones aren't lenticular for the reasons Uberdude said above about elipsoids which lenticular objects are a subset of iirc (many years since I studied this stuff so I could be wrong).


Well, I thought this was a thread about an English word.

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Offline Boidhre
 Post subject: Re: What is the name of the shape of a go stone ?
Post #10 Posted: Tue Feb 17, 2015 8:29 pm 
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DrStraw wrote:
Well, I thought this was a thread about an English word.


The discussion has been about elipsoids and oblate spheroids, was going with the flow.
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Offline gowan
 Post subject: Re: What is the name of the shape of a go stone ?
Post #11 Posted: Thu Feb 19, 2015 7:50 am 
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DrStraw wrote:
gowan wrote:
Lenticular?


Can't lenticular also refer to a concave lens?


Dictionary definition: having the shape of a double-convex lens.

The second meaning is having the shape of a lens which, as you say, might be concave.
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Offline John Fairbairn
 Post subject: Re: What is the name of the shape of a go stone ?
Post #12 Posted: Thu Feb 19, 2015 10:32 am 
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Quote:
Well, I thought this was a thread about an English word.


I want to agree, having, possibly like you, been brought up in a world where four hanks make a spangle, but the real words traditionally used to describe stone shapes are Japanese: kamaboko, (soroban) abacus bead and Honinbo.

The fact that the abacus bead stone shape resembles no abacus bead I have ever seen just adds to its charm.

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Offline Bill Spight
 Post subject: Re: What is the name of the shape of a go stone ?
Post #13 Posted: Thu Feb 19, 2015 11:27 am 
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John Fairbairn wrote:
Quote:
Well, I thought this was a thread about an English word.


I want to agree, having, possibly like you, been brought up in a world where four hanks make a spangle, but the real words traditionally used to describe stone shapes are Japanese: kamaboko, (soroban) abacus bead and Honinbo.

The fact that the abacus bead stone shape resembles no abacus bead I have ever seen just adds to its charm.


I does kind of look like the plastic beads of a cheap soroban I used to have. :) But not like those of the classier, wooden sorobans I have seen.

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