Earlier today I messed around a little 
bit with Peter Popov's code for
"one of those twisted thingies" 

And from his code I learned something 
that some (or many ?) of you others 
probably already knew:

Components in a Blob can be Scaled and 
Transformed individually !

Very useful !  Thank you Peter.


This is one of the images that came out.

(I rendered it a little to dark, so 
instead of waiting for another 4 hours
rendering, I adjusted the tonal balance 
a little bit.)


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Attachments:
Download 'twistedtorus02.jpg' (22 KB)

Preview of image 'twistedtorus02.jpg'

Wow... I like it... What did you do...?

Tor Olav Kristensen wrote:

> Earlier today I messed around a little
> bit with Peter Popov's code for
> "one of those twisted thingies"
>
> And from his code I learned something
> that some (or many ?) of you others
> probably already knew:
>
> Components in a Blob can be Scaled and
> Transformed individually !
>
> Very useful !  Thank you Peter.
>
> This is one of the images that came out.
>
> (I rendered it a little to dark, so
> instead of waiting for another 4 hours
> rendering, I adjusted the tonal balance
> a little bit.)
>
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
>
>   ------------------------------------------------------------------------
>  [Image]

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>
> And from his code I learned something
> that some (or many ?) of you others
> probably already knew:
>
> Components in a Blob can be Scaled and
> Transformed individually !


Grrrr... i knew that and never managed such an interesting object with that
knowledge ;)

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On Tue, 04 Jul 2000 02:13:44 +0200, Tor Olav Kristensen
<tor### [at] onlineno> wrote:

>Earlier today I messed around a little 
>bit with Peter Popov's code for
>"one of those twisted thingies" 

Oh no! Zilvah, what have we done?
*runs away*

>Components in a Blob can be Scaled and 
>Transformed individually !

Eureka :))

>Very useful !  Thank you Peter.

De nada.

>This is one of the images that came out.

/me likes. Looks like an amoeba of sorts (or so my brother says).

>(I rendered it a little to dark, so 
>instead of waiting for another 4 hours
>rendering, I adjusted the tonal balance 
>a little bit.)

I thought you were using a Mac and hence the gamma problem. It's a
nice image nonetheless.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg

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[snip]
> >This is one of the images that came out.
> 
> /me likes. Looks like an amoeba of sorts (or so my brother says).

Looks more like a Sand Dollar to me.  For those who don't know, a Sand 
Dollar is an echinoderm (or starfish for the non-biologists out there) 
which ends up sold to tourists as a curiosity in various places (I think 
my mother brought a couple back from Florida)

Cute image though.

Bye for now,
     Jamie,

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But the main body is missing, and that is where the stomach and the mouth
and "Brain" is located... how would it eat?

--
"Yub-Yub!" Lt. Kettch

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> But the main body is missing, and that is where the stomach and the mouth
> and "Brain" is located... how would it eat?

Brain?  These are echinoderms we're talking about... :)

They have a pentaradial nerve ring, which is about as close as you get to 
a nervous centre.

If I could be bothered, I'd dig out my invertebrates text from my degree 
and *really* bore you :)

But I was thinking more of the skeletons which are what get sold to 
tourists.

(BTW, don't get me started any more than I am already.  It's not a pretty 
sight <grin>)

Bye for now,
     Jamie.

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Moon47 wrote:
> 
> Wow... I like it... What did you do...?

Thank you, but I didn't do much.

I just modified some of Peter's translation 
and rotation statements with some cosine values.


See code below.

Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html


#declare Steps = 1500;
#declare MajorRad = 10;
#declare MinorRad = 2;
#declare Turns = 5;

#declare Circumference = 2*pi*MajorRad;
#declare Thickness = 5*Circumference/Steps;

#declare dDegStep = 360/Steps;
#declare dRadStep = 2*pi/Steps; 

#declare TwistedTorus =
blob {
  threshold 1
  #declare Cnt = 0;
  #while (Cnt < Steps)
    #local RadCnt = Cnt*dRadStep;
    #local DegCnt = Cnt*dDegStep;
    sphere {
      0, 3, 0.125
      scale <2*MinorRad, MinorRad*0.5, Thickness>
      translate x*MinorRad
      rotate 12*cos(Turns*RadCnt)*z
      translate MajorRad*x + MinorRad/8*cos(Turns*RadCnt)*y
      rotate (DegCnt + 8*cos(Turns*RadCnt))*y
    }
    #declare Cnt = Cnt + 1;
  #end
  sturm
}

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Ross Litscher wrote:
> 
> >
> > And from his code I learned something
> > that some (or many ?) of you others
> > probably already knew:
> >
> > Components in a Blob can be Scaled and
> > Transformed individually !
> 
> Grrrr... i knew that and never managed such an interesting object with that
> knowledge ;)

:|  Do not Bite !


In this image the scaling for each blob 
component (sphere) is the same. 

But how about scaling each blob component 
completely independently from all the
others ?

One could for example do the scaling 
relative to the components position in 
space or relative to a pattern (in 
MegaPOV ?) or as functions of a loop 
counter or by some trigonometric 
functions or ....

But I guess most of this has been done 
before. :(


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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Peter Popov wrote:
> ...
> Oh no! Zilvah, what have we done?
> *runs away*

Hmmm ... I wonder who Zilvah is. :) 

(None of my searches at Altavista, Excite or 
Infoseek produced any results.)


> /me likes. Looks like an amoeba of sorts (or so my brother says).

Thank you.


Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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