"Bald Eagle" <cre### [at] netscapenet> wrote:

> I'm thinking of doing the shell and the chambering all in one go with something
> like the attached.   It seems like a perfect use for the ovus {} object, if it
> gets hollowed out with a rounded cone first.   Then they'd all nest together.

A quick cobbling together of an ovus with an ellipsoid subtracted away.
The shell itself renders fairly quickly, the difference to show the cross
section was _slow_ (6.5 min.)

Parameterizing this would be challenging, to get the spiral tightness and
spacing correct while keeping the chambers properly spaced and angled the right
way...

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Op 30-4-2021 om 03:25 schreef Bald Eagle:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> 
>> I'm thinking of doing the shell and the chambering all in one go with something
>> like the attached.   It seems like a perfect use for the ovus {} object, if it
>> gets hollowed out with a rounded cone first.   Then they'd all nest together.
> 
> A quick cobbling together of an ovus with an ellipsoid subtracted away.
> The shell itself renders fairly quickly, the difference to show the cross
> section was _slow_ (6.5 min.)
> 
> Parameterizing this would be challenging, to get the spiral tightness and
> spacing correct while keeping the chambers properly spaced and angled the right
> way...
> 
Good try. Interested to see how this would show in a rock slab.

I found my old program: Helixir, from the 1990's. Saves mesh{} files but 
not yet sure if it will do.

-- 
Thomas

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plane {z, 0
 texture {
  object {Shell
   texture {T_Grnt1} // outside
   texture {T_Grnt14}  // inside
  }
 }
}

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Op 30/04/2021 om 23:32 schreef Bald Eagle:
> plane {z, 0
>   texture {
>    object {Shell
>     texture {T_Grnt1} // outside
>     texture {T_Grnt14}  // inside
>    }
>   }
> }
> 

ok... stylised ammonite ;-) Makes a nice pattern though; I would keep it 
as such, but as an ammonite... not yet there (too high above the uncanny 
valley).

-- 
Thomas

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Bald Eagle wrote on 30/04/2021 23:32:
> plane {z, 0
>   texture {
>    object {Shell
>     texture {T_Grnt1} // outside
>     texture {T_Grnt14}  // inside
>    }
>   }
> }
> 

A nice work!

Paolo

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Bald Eagle wrote on 28/04/2021 19:50:
> I know I have it ... somewhere.  Way back someone had posted an animation of a
> rotating pyramid, showing off sslt.  It was a glassy agate kind of thing with a
> great texture and amazing sslt finish.
> 
> I know Robert McGregor has done some very nice work employing sslt as well.
> Maybe search the archives for sslt scenes and see what sorts of examples you can
> find to get where you want faster.
> 
> 
> 

I will investigate...

Paolo

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Thomas de Groot wrote on 28/04/2021 16:58:
> Op 28-4-2021 om 14:35 schreef Paolo Gibellini:
>>
>> Ugh... a first try.
>>
> Aaah... yes, I can imagine a 'marble' table top with such a texture, 
> probably as an artificial stone but with such an intriguing/hypnotic 
> texture. I like your colour choices btw; they work extremely well 
> indeed. I am not entirely certain about the normal though.
> 

The normal is not related with the content... is just a quick test ;-)

Paolo

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Paolo Gibellini <p.g### [at] gmailcom> wrote:
> Bald Eagle wrote on 28/04/2021 19:50:
> > I know I have it ... somewhere.


Found it.
No idea when it's from, who made it, or where I got it.

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Bald Eagle wrote on 26/05/2021 03:39:
> Paolo Gibellini <p.g### [at] gmailcom> wrote:
>> Bald Eagle wrote on 28/04/2021 19:50:
>>> I know I have it ... somewhere.
> 
> 
> Found it.
> No idea when it's from, who made it, or where I got it.
> 

It looks great,
   Paolo

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Op 26-5-2021 om 03:39 schreef Bald Eagle:
> Paolo Gibellini <p.g### [at] gmailcom> wrote:
>> Bald Eagle wrote on 28/04/2021 19:50:
>>> I know I have it ... somewhere.
> 
> 
> Found it.
> No idea when it's from, who made it, or where I got it.
> 
It is good showcase.

-- 
Thomas

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