It is currently Mon May 05, 2025 3:30 pm

View unanswered posts | View active topics View unread posts | View new posts | View your posts


Board index » Life In 19x19.com General Topics » General Go Chat

All times are UTC - 8 hours [ DST ]



Post new topic Reply to topic  Page 1 of 1
  [ 13 posts ] 
  Print view Previous topic | Next topic 
Author Message
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 
Lives in gote
User avatar

Posts: 699
Location: Switzerland
Liked others: 485
Was liked: 166
Rank: DDK
KGS: aco
IGS: oca
OGS: oca
Does anyone knows the name of the shape of a go stone ?
Thanks

_________________
Converting the book Shape UP! by Charles Matthews/Seong-June Kim
to the gobook format. last updated april 2015 - Index of shapes, p.211 / 216
Top
 Profile  
 
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 
Lives in gote
User avatar

Posts: 699
Location: Switzerland
Liked others: 485
Was liked: 166
Rank: DDK
KGS: aco
IGS: oca
OGS: oca
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 ;)

_________________
Converting the book Shape UP! by Charles Matthews/Seong-June Kim
to the gobook format. last updated april 2015 - Index of shapes, p.211 / 216
Top
 Profile  
 
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 
Judan

Posts: 6727
Location: Cambridge, UK
Liked others: 436
Was liked: 3720
Rank: UK 4 dan
KGS: Uberdude 4d
OGS: Uberdude 7d
Traditional biconvex stones are fairly close to an ellipsoid, though they may have a more pronounced 'lip' on the equator.

This post by Uberdude was liked by: oca
Top
 Profile  
 
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 
Gosei

Posts: 1348
Location: Finland
Liked others: 49
Was liked: 129
Rank: FGA 7k GoR 1297
Uberdude wrote:
Traditional biconvex stones are fairly close to an ellipsoid

And a specific kind of ellipsoid: oblate spheroid

_________________
Offending ad removed

This post by tj86430 was liked by: oca
Top
 Profile  
 
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 
Lives in gote
User avatar

Posts: 699
Location: Switzerland
Liked others: 485
Was liked: 166
Rank: DDK
KGS: aco
IGS: oca
OGS: oca
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

_________________
Converting the book Shape UP! by Charles Matthews/Seong-June Kim
to the gobook format. last updated april 2015 - Index of shapes, p.211 / 216
Top
 Profile  
 
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 
Gosei

Posts: 1628
Liked others: 546
Was liked: 450
Rank: senior player
GD Posts: 1000
Lenticular?

This post by gowan was liked by 2 people: Bonobo, palapiku
Top
 Profile  
 
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 
Oza

Posts: 2180
Location: ʍoquıɐɹ ǝɥʇ ɹǝʌo 'ǝɹǝɥʍǝɯos
Liked others: 237
Was liked: 662
Rank: AGA 5d
GD Posts: 4312
Online playing schedule: Every tenth February 29th from 20:00-20:01 (if time permits)
gowan wrote:
Lenticular?


Can't lenticular also refer to a concave lens?

_________________
Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).
Top
 Profile  
 
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 
Oza

Posts: 2356
Location: Ireland
Liked others: 662
Was liked: 442
Universal go server handle: Boidhre
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).

This post by Boidhre was liked by: Bonobo
Top
 Profile  
 
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 
Oza

Posts: 2180
Location: ʍoquıɐɹ ǝɥʇ ɹǝʌo 'ǝɹǝɥʍǝɯos
Liked others: 237
Was liked: 662
Rank: AGA 5d
GD Posts: 4312
Online playing schedule: Every tenth February 29th from 20:00-20:01 (if time permits)
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.

_________________
Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).
Top
 Profile  
 
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 
Oza

Posts: 2356
Location: Ireland
Liked others: 662
Was liked: 442
Universal go server handle: Boidhre
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.
Top
 Profile  
 
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 
Gosei

Posts: 1628
Liked others: 546
Was liked: 450
Rank: senior player
GD Posts: 1000
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.
Top
 Profile  
 
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 
Oza

Posts: 3723
Liked others: 20
Was liked: 4671
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.

This post by John Fairbairn was liked by: oca
Top
 Profile  
 
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 
Honinbo

Posts: 10905
Liked others: 3651
Was liked: 3374
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.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 13 posts ] 

Board index » Life In 19x19.com General Topics » General Go Chat

All times are UTC - 8 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group