Life In 19x19

Does anyone knows the name of the shape of a go stone ?
Thanks

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

Traditional biconvex stones are fairly close to an ellipsoid, though they may have a more pronounced 'lip' on the equator.

Uberdude wrote:Traditional biconvex stones are fairly close to an ellipsoid

And a specific kind of ellipsoid: oblate spheroid

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

Lenticular?

gowan wrote:Lenticular?

Can't lenticular also refer to a concave lens?

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).

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.

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.

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.

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.

John Fairbairn wrote:

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.