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1 Dec 2022 02:28:29 EST (-0500)
  Spiral (Message 11 to 20 of 26)  
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From: Jörg "Yadgar" Bleimann
Subject: Re: Spiral
Date: 5 Feb 2022 10:57:49
Message: <61fe9e7d@news.povray.org>
Hi(gh)!

On 03.02.22 08:41, Thomas de Groot wrote:

> Not the same, but this reminds me of Kenneth's airbrush technique (2008, 
> iirc). I am unable to find the exact post here.

Did you mean this:


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From: Jörg "Yadgar" Bleimann
Subject: Re: Spiral
Date: 5 Feb 2022 11:07:03
Message: <61fea0a7$1@news.povray.org>
Hi(gh)!

On 03.02.22 21:59, William F Pokorny wrote:

> Freezing rain, sleet & wet snow falling outside here. Yuck. :-(

Df and Cf climates close to D suck! I prefer Csa... and, luckily, global 
warming will bring the Mediterranean to Cologne!

See you in Khyberspace!

Yadgar


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From: Thomas de Groot
Subject: Re: Spiral
Date: 6 Feb 2022 02:20:23
Message: <61ff76b7@news.povray.org>
Op 05/02/2022 om 16:57 schreef Jörg "Yadgar" Bleimann:
> Hi(gh)!
> 
> On 03.02.22 08:41, Thomas de Groot wrote:
> 
>> Not the same, but this reminds me of Kenneth's airbrush technique 
>> (2008, iirc). I am unable to find the exact post here.
> 
> Did you mean this:
> 

I was thinking this:


-- 
Thomas


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From: Thomas de Groot
Subject: Re: Spiral
Date: 6 Feb 2022 02:23:45
Message: <61ff7781@news.povray.org>
Op 06/02/2022 om 08:20 schreef Thomas de Groot:
> Op 05/02/2022 om 16:57 schreef Jörg "Yadgar" Bleimann:
>> Hi(gh)!
>>
>> On 03.02.22 08:41, Thomas de Groot wrote:
>>
>>> Not the same, but this reminds me of Kenneth's airbrush technique 
>>> (2008, iirc). I am unable to find the exact post here.
>>
>> Did you mean this:
>>
> 
> I was thinking this:
> 
or this:



-- 
Thomas


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From: David Buck
Subject: Re: Spiral
Date: 6 Feb 2022 10:22:44
Message: <61ffe7c4$1@news.povray.org>
This makes me wonder if you could get the illusion of a full-color image 
by having three spirals - one red, one green and one blue - that are 
separate but which spiral out together.

David

On 2022-02-03 2:04 p.m., Cousin Ricky wrote:
> On 2022-02-03 11:19 (-4), Cousin Ricky wrote:
>> On 2022-02-02 07:19 (-4), m@b wrote:
>>> I saw this
>>> <https://publicdomainreview.org/collection/mellan-sudarium-of-saint-veronica>
>>>
>>> And I made this:
>>
>> Still tuning the macro, but it's essentially done.  This image is made
>> with spheres and cylinders, but it can easily be switched to a sphere_sweep.
> 
> Another, plus color channel renders.  And my hair appears to be thinning.


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From: Cousin Ricky
Subject: Re: Spiral
Date: 6 Feb 2022 12:54:37
Message: <62000b5d$1@news.povray.org>
On 2022-02-06 11:22 (-4), David Buck wrote:
> This makes me wonder if you could get the illusion of a full-color image
> by having three spirals - one red, one green and one blue - that are
> separate but which spiral out together.

I'm sure it's possible, although it would need some sort of value
inversion somewhere.  A naive application would have, say, redder
(lighter) areas with a thicker (darker) line.  One quick, if somewhat
goth, fix would be to just have a black background.

> On 2022-02-03 2:04 p.m., Cousin Ricky wrote:
>>
>> Another, plus color channel renders.  And my hair appears to be thinning.

P.S. I believe this is our first direct communication, so let me take
this opportunity to thank you for DKBTrace and POV-Ray.


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From: David Buck
Subject: Re: Spiral
Date: 6 Feb 2022 16:07:21
Message: <62003889$1@news.povray.org>
I'm happy that I've been able to play a part in this project.  It's been 
a fun ride and still a source of pride for me.

David

On 2022-02-06 12:54 p.m., Cousin Ricky wrote:
> P.S. I believe this is our first direct communication, so let me take
> this opportunity to thank you for DKBTrace and POV-Ray.


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From: Cousin Ricky
Subject: Re: Spiral
Date: 8 Feb 2022 16:40:50
Message: <6202e362$1@news.povray.org>
On 2022-02-03 11:19 (-4), Cousin Ricky wrote:
> 
> Still tuning the macro, but it's essentially done.  This image is made
> with spheres and cylinders, but it can easily be switched to a sphere_sweep.

Spheres and cones, actually.  My macro calls SphereSweep from the Object
Collection, and on the quoted post I wasn't thinking about how
SphereSweep did its job.

I was planning to wean my macro off SphereSweep, but then it occurred to
me that a sudden change in color might be too drastic a change in sphere
sizes to connect with a cone.  I'm talking degenerate cone and square
root of a negative number parse errors here.  SphereSweep handles these
complications automatically, so I'm just going to keep it as a prerequisite.


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From: Kenneth
Subject: Re: Spiral
Date: 10 Feb 2022 13:35:00
Message: <web.620559d3c95e65754cef624e6e066e29@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
>
> Not the same, but this reminds me of Kenneth's airbrush technique
> (2008, iirc). I am unable to find the exact post here.
> ...
> I was thinking this:
>

Sorry for not posting here earlier; I was totally absorbed in running camera
'normal' experiments.

Hmm, I don't remember posting those images, although they look like the
experiments you and I did in my long-ago post (the one that Yadgar referenced).
Perhaps from a different 'Kenneth'? I searched all of the image posts for 2008
and didn't see another fellow by that name. TWO users named Kenneth??
Impossible! :-P

Anyway...I really like these spiral experiments. I was thinking about the
earlier suggestion of somehow using the technique to reproduce a full-color
photo-- perhaps by making separate spirals of the image's 3 separate color
channels (with the spirals colored red/green/blue), but having different
spacings or gaps between the spirals so that they sort of 'blend together' in
the viewer's eye. I haven't thought this through in detail, though. By using
different spiral 'frequencies? Maybe it's not possible geometrically.


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From: m@b
Subject: Re: Spiral
Date: 11 Feb 2022 02:20:29
Message: <62060e3d@news.povray.org>
On 06/02/2022 11:22 pm, David Buck wrote:
> This makes me wonder if you could get the illusion of a full-color image 
> by having three spirals - one red, one green and one blue - that are 
> separate but which spiral out together.
> 
> David

It's quick and dirty, but here it is, 3 spirals, one red, one green and 
one blue:


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