Le 13/10/2012 16:08, Stephen nous fit lire :
> On 13/10/2012 2:39 PM, Le_Forgeron wrote:
>> Why did you choose blob ?
>>
> 
> It just seemed the right object, for a blown glass shape, to me.
> 
>> Have a look in the portfolio the o_shapesq12: the Lemniscate.
>>
> 
> I did, or rather I tried the function f_lemniscate_of_gerono(x,y,z, P0).
> But the halves come together at a point, making it hard for the sand to
> get through. ;-)
> 
> A good suggestion if I did not want a close shot.

Merge it with a small cylinder where it is not thick enough (and I have
a preference for the quartic form, probably my old age)

something along:

difference {
  merge {
    outer_lemniscate
    cylinder_at_point
  }
  inner_lemniscate
 material { glass... }
}

For once, the point of the lemniscate seems good for the bottleneck (or
you can also add a cylinder too.

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