"Kenneth" <kdw### [at] gmailcom> wrote:

> I wonder if others see the same thing?

I (obviously) did not.
Try pasting into archive.org's Wayback Machine and use the archived page.

- BE

Post a reply to this message

Le 2026-04-08 à 09:46, Kenneth a écrit :
> "Bald Eagle" <cre### [at] netscapenet> wrote:
>>
>> https://www.geocities.ws/povstairs/
>>
> 
> Using Firefox: When I go to that URL, I *briefly* see the intended page, which
> is then interrupted by another page requiring 'notifications' to be sent to me;
> otherwise I can't access it. I don't know if that's a Geocities thing, or if the
> site is being hijacked. In any case, I don't like having to accept notifications
> just to see a page.
> 
> I wonder if others see the same thing?
> 
> 
> 
> 
Also using Firefox and no problem.
Check your antivirus and other security application. Maybe it's over 
zealous.

Post a reply to this message

Am 08.04.26 um 19:02 schrieb Alain Martel:
> Le 2026-04-08 à 09:46, Kenneth a écrit :
>> "Bald Eagle" <cre### [at] netscapenet> wrote:
>>>
>>> https://www.geocities.ws/povstairs/
>>>
>>
>> Using Firefox: When I go to that URL, I *briefly* see the intended 
>> page, which
>> is then interrupted by another page requiring 'notifications' to be 
>> sent to me;
>> otherwise I can't access it. I don't know if that's a Geocities thing, 
>> or if the
>> site is being hijacked. In any case, I don't like having to accept 
>> notifications
>> just to see a page.
>>
>> I wonder if others see the same thing?
>>
>>
>>
>>
> Also using Firefox and no problem.
> Check your antivirus and other security application. Maybe it's over 
> zealous.

Using Firefox, I get a brief glimpse of a website displaying POV-Stairs 
macros, but a few seconds later I’m redirected to a porn site. As far as 
I know, Geocities has been offline since 2009. Perhaps someone is trying 
to lure visitors to their website using old content.

Best regards
Michael

Post a reply to this message

"Kenneth" <kdw### [at] gmailcom> wrote:
> "Bald Eagle" <cre### [at] netscapenet> wrote:
> >
> > https://www.geocities.ws/povstairs/
> >
>
> Using Firefox: When I go to that URL, I *briefly* see the intended page, which
> is then interrupted by another page requiring 'notifications' to be sent to me;
> otherwise I can't access it. I don't know if that's a Geocities thing, or if the
> site is being hijacked. In any case, I don't like having to accept notifications
> just to see a page.
>
> I wonder if others see the same thing?

I went too that website in duckduckgo.  Briefly saw the staircase page that was

Post a reply to this message

"Clarence1898" <dle### [at] comcastnet> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:
> > "Bald Eagle" <cre### [at] netscapenet> wrote:
> > >
> > > https://www.geocities.ws/povstairs/
> > >
> >
> > Using Firefox: When I go to that URL, I *briefly* see the intended page, which
> > is then interrupted by another page requiring 'notifications' to be sent to me;
> > otherwise I can't access it. I don't know if that's a Geocities thing, or if the
> > site is being hijacked. In any case, I don't like having to accept notifications
> > just to see a page.
> >
> > I wonder if others see the same thing?
>
> I went too that website in duckduckgo.  Briefly saw the staircase page that was
>

immediately followed by the message: This <webpage> can't be found

When I posted the previous message the line containing the message page name was
deleted.  Sent it from firefox on win 11.

The page was whicoosparabed.com

Post a reply to this message

---%<---%<---%<---%<
#version 3.7;
global_settings{assumed_gamma 1}
#default{ finish{ambient 0.1 diffuse 0.9}}
camera {
   orthographic
   location <0,0,1> look_at 0
   right x*image_width/image_height
}

#declare Chladni = function(x,y,z,A,B,C,L,M,N){
   (A * sin(pi * L * x) * sin(pi * M * y) * sin(pi * N * z) +
   B * sin(pi * M * x) * sin(pi * N * y) * sin(pi * L * z) +
   C * sin(pi * N * x) * sin(pi * L * y) * sin(pi * M * z)) / (A+B+C)
}

box {
   <-0.5, -0.5, 0>, <0.5, 0.5, 0>
   texture {
     pigment {
       function{Chladni(x,y,z,3.3,4.0,1.0,2.3,3.8,2.1)}
       color_map {
          [0 rgb 0]
          [0 rgb 1]
          [0.05 rgb 1]
          [0.05 rgb 0]
       }
     }
     translate <0,0,0.8>
     scale 0.15

     finish {
       ambient 1.0
       diffuse 0.0
     }
   }
}
---%<---%<---%<---

Post a reply to this message

Attachments:
Download 'chladni.png' (90 KB)

Preview of image 'chladni.png'

Ah, the good ole' Chladni functions  :)

I've played around with these in both 2D and 3D.  I think it takes some time to
evaluate all the possibilities and choose the really good patterns that emerge.

The Chladni patterns remind me of the Zernicke polynomials that I investigated
when exploring lens distortions that cause and relieve astigmatism.

And then there are the spherical harmonics and the atomic oribitals.

Presumably there are a lot more related phenomena that could be pressed into
service for 2D patterns and 3D shapes.

It would be even nicer if there exists a way to interpolate between them.

I have an idea for interpolating between all of the 16 different Boolean
operations via Grey code numbers along the edges connecting the vertices of a
hypercube . . .

.... which may require time expansion, insomnia, and something stronger than
coffee and a gin & tomic.

- BE

Post a reply to this message

On 08/04/2026 20:39, MichaelJF wrote:

> 
> Using Firefox, I get a brief glimpse of a website displaying POV-Stairs 
> macros, but a few seconds later I’m redirected to a porn site. As far as 
> I know, Geocities has been offline since 2009. Perhaps someone is trying 
> to lure visitors to their website using old content.
> 

Neither the website nor Firefox is to blame.
Your computer is simply infected with malware ;)




-- 
kurtz le pirate
compagnie de la banquise

Post a reply to this message

On 10/04/2026 17:17, ingo wrote:

> 
> #declare Chladni = function(x,y,z,A,B,C,L,M,N){
>    (A * sin(pi * L * x) * sin(pi * M * y) * sin(pi * N * z) +
>    B * sin(pi * M * x) * sin(pi * N * y) * sin(pi * L * z) +
>    C * sin(pi * N * x) * sin(pi * L * y) * sin(pi * M * z)) / (A+B+C)
> }
> 


Chladni patterns... another area I wanted to explore but never got 
around to. Congrats on this “simple” code, too


-- 
kurtz le pirate
compagnie de la banquise

Post a reply to this message

kurtz le pirate <kur### [at] freefr> wrote:

> Chladni patterns... another area I wanted to explore but never got


Maybe this absolute classic will inspire you to forge ahead:

https://www.youtube.com/watch?v=tFAcYruShow

- BE

Post a reply to this message