My first image with photons.

I used radiosity too.

The shapes are made with intersections of some tori.
(Except from the ground plane and the sky sphere.)


Tor Olav

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Attachments:
Download 'TorusStrip13.jpg' (60 KB)

Preview of image 'TorusStrip13.jpg'

Beautiful.  Being a metalworker, I love the interaction with metal and
glass.


"Tor Olav Kristensen" <tor_olav_kCURLYAhotmail.com> wrote in message
news:3ffc9730@news.povray.org...
>
> My first image with photons.
>
> I used radiosity too.
>
> The shapes are made with intersections of some tori.
> (Except from the ground plane and the sky sphere.)
>
>
> Tor Olav
>
>

Post a reply to this message

I usually just lurk around here, but I had to reply cause... man, that's
stunning! Absolutely love it.

Matt

"Tor Olav Kristensen" <tor_olav_kCURLYAhotmail.com> wrote in message
news:3ffc9730@news.povray.org...
>
> My first image with photons.
>
> I used radiosity too.
>
> The shapes are made with intersections of some tori.
> (Except from the ground plane and the sky sphere.)
>
>
> Tor Olav
>
>

Post a reply to this message

In article <3ffc9730@news.povray.org>,
 Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote:

> The shapes are made with intersections of some tori.
> (Except from the ground plane and the sky sphere.)

A beautiful little object...a nice illustration of the relation between 
mobius strips and torii as well.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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If I saw this sitting in a shop I would have to buy it!  Amazing!   :)

To me words can't describe this image and do it justice... :)


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Very nice, Tor!

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"Christopher James Huff" <cja### [at] earthlinknet> wrote
> In article <3ffc9730@news.povray.org>,
>  Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote:

> > The shapes are made with intersections of some tori.
> > (Except from the ground plane and the sky sphere.)

> A beautiful little object...a nice illustration of the relation between
> mobius strips and torii as well.

Mobius strips?

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In article <3ffd5873$1@news.povray.org>,
 "Jason F. Kowalski" <jfk### [at] hotmailcom> wrote:

> > > The shapes are made with intersections of some tori.
> > > (Except from the ground plane and the sky sphere.)
> 
> > A beautiful little object...a nice illustration of the relation between
> > mobius strips and torii as well.
> 
> Mobius strips?

The white bands in that image. A Mobius strip is a ribbon loop with a 
half twist, giving it one side.

http://mathworld.wolfram.com/MoebiusStrip.html

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

Post a reply to this message

Outstanding. I'd like one of those. :-)

> My first image with photons.
>
> I used radiosity too.
>
> The shapes are made with intersections of some tori.
> (Except from the ground plane and the sky sphere.)

Post a reply to this message

"Tor Olav Kristensen" <tor_olav_kCURLYAhotmail.com> wrote in message
news:3ffc9730@news.povray.org...
>
> My first image with photons.
>
> I used radiosity too.

If you have spare time, could you post the same image without photons and
with caustics? Just curious :)

Severi

Post a reply to this message

Thank you all !

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,,,,,,,,,,,,,,,,,,,,,,,,,,,.tjjj,:,,,,,,.tjjj,:,,,,,,,,,,,,,,,,,,,,,,,
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,,,,,,:jW##Ej::,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,:,GW##Ki.,,,,,,
,,,,,,,:,GW##Kf,:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,::iGW##Kf::,,,,,,,
,,,,,,,,,:,GW###Ef;::,,,,,,,,,,,,,,,,,,,,,,,,,,,,:,iLK###Kf,:,,,,,,,,,
,,,,,,,,,,,:,LK####WDfi,,::,,,,,,,,,,,,,,,,::,;ifEW####Kj::,,,,,,,,,,,
,,,,,,,,,,,,,::iDW######WKDGfjjttttttttjffGDKW######KL;::,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,:,iLKW##########################WEf;::,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,,:,ifGEW###############WKELj;,:,,,,,,,,,,,,,,,,,,,,
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Tor Olav

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"Severi Salminen" <sev### [at] NOT_THISsibafi> wrote in 
news:3ffde15b$1@news.povray.org:

> 
> "Tor Olav Kristensen" <tor_olav_kCURLYAhotmail.com> wrote in message
> news:3ffc9730@news.povray.org...
>>
>> My first image with photons.
>>
>> I used radiosity too.
> 
> If you have spare time, could you post the same image without photons and
> with caustics? Just curious :)


Ok, but first I'll let my PC finish
a 800x600 rendering of this image.


Tor Olav

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Christopher James Huff <cja### [at] earthlinknet> wrote in
news:cja### [at] netplexaussieorg: 

> In article <3ffd5873$1@news.povray.org>,
>  "Jason F. Kowalski" <jfk### [at] hotmailcom> wrote:
> 
>> > > The shapes are made with intersections of some tori.
>> > > (Except from the ground plane and the sky sphere.)
>> 
>> > A beautiful little object...a nice illustration of the relation
>> > between mobius strips and torii as well.
>> 
>> Mobius strips?
> 
> The white bands in that image. A Mobius strip is a ribbon loop with a 
> half twist, giving it one side.
> 
> http://mathworld.wolfram.com/MoebiusStrip.html


I was a bit surprised that you referred to them as
Moebius strips.

But then I saw that the Mathworld page you gave a
link to above mentions this specifically:

"A torus can be cut into a Möbius strip with an even
number of half-twists ... "

Nice to know.


Tor Olav

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Among other things, Tor Olav Kristensen wrote:

>> The white bands in that image. A Mobius strip is a ribbon loop with a
>> half twist, giving it one side.
>> 
>> http://mathworld.wolfram.com/MoebiusStrip.html
> 
> I was a bit surprised that you referred to them as
> Moebius strips.
> 
> But then I saw that the Mathworld page you gave a
> link to above mentions this specifically:
> 
> "A torus can be cut into a Möbius strip with an even
> number of half-twists ... "

But a Möbius strip with an even number of half-twists isn't single-sided 
anymore, is it? Then that's not what I'd call a Möbius strip, it still has 
a definite inside and outside (when in the surface of the torus).

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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Jellby <jel### [at] M-yahoocom> wrote in news:3ffef8d2@news.povray.org:

> Among other things, Tor Olav Kristensen wrote:
> 
>>> The white bands in that image. A Mobius strip is a ribbon loop with
>>> a half twist, giving it one side.
>>> 
>>> http://mathworld.wolfram.com/MoebiusStrip.html
>> 
>> I was a bit surprised that you referred to them as
>> Moebius strips.
>> 
>> But then I saw that the Mathworld page you gave a
>> link to above mentions this specifically:
>> 
>> "A torus can be cut into a Möbius strip with an even
>> number of half-twists ... "
> 
> But a Möbius strip with an even number of half-twists isn't
> single-sided anymore, is it? Then that's not what I'd call a Möbius
> strip, it still has a definite inside and outside (when in the surface
> of the torus). 

It is interesting to see that my Encyclopædia
Britannica has this definition of a Moebius strip:

"Möbius strip, the topological space obtained by
identifying, or pasting together, the ends of a
rectangular strip after first having given one of
the ends a one-half twist."

And, of course, it also says this:

"This space exhibits interesting properties, such
as having only one side and remaining still in one
piece when split down the middle."


Tor Olav

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In article <3ffef8d2@news.povray.org>, Jellby <jel### [at] M-yahoocom> 
wrote:

> But a Möbius strip with an even number of half-twists isn't single-sided 
> anymore, is it? Then that's not what I'd call a Möbius strip, it still has 
> a definite inside and outside (when in the surface of the torus).

It is two-sided...I don't know if that's a requirement for it to be a 
Möbius strip, though. One would think the MathWorld people would know, 
but that page kind of contradicts itself, giving a definition of a 
Möbius strips as a one-sided ribbon loop with a single half twist, and 
then referring to Möbius strips with even numbers of half twists...but 
there's not really any other differences between the shapes. I think 
it's close enough, though...

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: <chr### [at] tagpovrayorg>
http://tag.povray.org/

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Tor Olav Kristensen <tor_olav_kCURLYAhotmail.com> wrote in
news:3ffe1094$1@news.povray.org: 

> "Severi Salminen" <sev### [at] NOT_THISsibafi> wrote in 
> news:3ffde15b$1@news.povray.org:
> 
>> 
>> "Tor Olav Kristensen" <tor_olav_kCURLYAhotmail.com> wrote in message
>> news:3ffc9730@news.povray.org...
>>>
>>> My first image with photons.
>>>
>>> I used radiosity too.
>> 
>> If you have spare time, could you post the same image without photons
>> and with caustics? Just curious :)
...

Here it is.

I have also attached two other images that shows the
difference between the images.

In the last image I have modified the color tones to
"amplify" the difference.


Tor Olav

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Attachments:
Download 'TorusStrip13_NoPhotons.jpg' (61 KB) Download 'TorusStrip13_Difference.jpg' (32 KB) Download 'TorusStrip13_DifferenceAmplified.jpg' (77 KB)

Preview of image 'TorusStrip13_NoPhotons.jpg'

Preview of image 'TorusStrip13_Difference.jpg'

Preview of image 'TorusStrip13_DifferenceAmplified.jpg'

Among other things, Christopher James Huff wrote:

>> But a Möbius strip with an even number of half-twists isn't single-sided
>> anymore, is it? Then that's not what I'd call a Möbius strip, it still
>> has a definite inside and outside (when in the surface of the torus).
> 
> It is two-sided...I don't know if that's a requirement for it to be a
> Möbius strip, though. One would think the MathWorld people would know,
> but that page kind of contradicts itself, giving a definition of a
> Möbius strips as a one-sided ribbon loop with a single half twist, and
> then referring to Möbius strips with even numbers of half twists...but
> there's not really any other differences between the shapes. I think
> it's close enough, though...

For me it is an important difference, but I'm no one in Mathematics :-) 
They're topologically different, a Möbius strip is one-sided and that makes 
it strange in some way; a strip with an odd number of half-twists is 
one-sided too, it's not a proper Möbius strip, but it is related; a strip 
with an even number of half-twists is just a twisted strip, there's nothing 
strange about it. Well, that's my view, I wouldn't say an "open" cylinder 
is a Möbius strip with an even number (zero) of half-twists :-P

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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>>>If you have spare time, could you post the same image without photons
>>>and with caustics? Just curious :)
> 
> ...
> 
> Here it is.
> 
> I have also attached two other images that shows the
> difference between the images.
> 
> In the last image I have modified the color tones to
> "amplify" the difference.

Thanks, it looks good, allthough the photon version looks a lot more 
realistic, of course. Do you remember how big was the difference in 
render time?

Severi

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Severi Salminen <sev### [at] NOT_THISsibafi> wrote in 
news:3fffd7e7$1@news.povray.org:

>>>>If you have spare time, could you post the same image without photons
>>>>and with caustics? Just curious :)
>> 
>> ...
>> 
>> Here it is.
>> 
>> I have also attached two other images that shows the
>> difference between the images.
>> 
>> In the last image I have modified the color tones to
>> "amplify" the difference.
> 
> Thanks, it looks good, allthough the photon version looks a lot more 
> realistic, of course. Do you remember how big was the difference in 
> render time?

The 640x480 no-photons version took about 1.5 hour
to render. I'm don't remember how long time the
photons version took. But I think it took more than
twice that time.


Tor Olav

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