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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| What is the name of the shape of a go stone ? http://www.lifein19x19.com/viewtopic.php?f=10&t=11483 |
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| Author: | oca [ Tue Feb 17, 2015 2:09 am ] |
| Post subject: | What is the name of the shape of a go stone ? |
Does anyone knows the name of the shape of a go stone ? Thanks |
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| Author: | oca [ Tue Feb 17, 2015 2:27 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | Uberdude [ Tue Feb 17, 2015 2:57 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
Traditional biconvex stones are fairly close to an ellipsoid, though they may have a more pronounced 'lip' on the equator. |
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| Author: | tj86430 [ Tue Feb 17, 2015 3:28 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
Uberdude wrote: Traditional biconvex stones are fairly close to an ellipsoid And a specific kind of ellipsoid: oblate spheroid |
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| Author: | oca [ Tue Feb 17, 2015 4:51 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | gowan [ Tue Feb 17, 2015 7:03 pm ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
Lenticular? |
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| Author: | DrStraw [ Tue Feb 17, 2015 7:46 pm ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
gowan wrote: Lenticular? Can't lenticular also refer to a concave lens? |
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| Author: | Boidhre [ Tue Feb 17, 2015 8:12 pm ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | DrStraw [ Tue Feb 17, 2015 8:20 pm ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | Boidhre [ Tue Feb 17, 2015 8:29 pm ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | gowan [ Thu Feb 19, 2015 7:50 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | John Fairbairn [ Thu Feb 19, 2015 10:32 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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| Author: | Bill Spight [ Thu Feb 19, 2015 11:27 am ] |
| Post subject: | Re: What is the name of the shape of a go stone ? |
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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