More mobius related material.

-tgq

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Attachments:
Download 'MobTwist.avi.dat' (439 KB)

On Thu, 18 Jul 2002 14:47:38 -0400, TinCanMan wrote...
> More mobius related material.

Cute...  :)

Jamie.

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Dammit, just spent all night rendering this, and you beat me to it :-)

Actually, you will be the man to ask. In my (albeit) short experiment, I
couldn't work out how to keep the strip closed. In this anim, Nr goes from 0
to 4 (equalling 4*180 = 360 degrees. Correct?), and SA from 0 to 360. Still,
they twist at different speeds. Are they additive? ie does one act on the
other, so they'll never be in sync? (I glanced at mobius.inc, got a headache
immediately, and thought better of it. Looks complicated!)

Anyhow, not to worry. I was just messin'

All the best,

Andy Cocker

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Attachments:
Download 'Photon_Twistin.mpg' (563 KB)

"Andrew Cocker" <mai### [at] mariner9net> wrote in message
news:3d37da15@news.povray.org...
>
> Dammit, just spent all night rendering this, and you beat me to it :-)
>
> Actually, you will be the man to ask. In my (albeit) short experiment, I
> couldn't work out how to keep the strip closed. In this anim, Nr goes from
0
> to 4 (equalling 4*180 = 360 degrees. Correct?), and SA from 0 to 360.
Still,
> they twist at different speeds. Are they additive? ie does one act on the
> other, so they'll never be in sync? (I glanced at mobius.inc, got a
headache
> immediately, and thought better of it. Looks complicated!)
>

Very nice, I see you even tried the uv mapping.
As for your question: The strip is only closed when Nr is an integer (i.e. a
full half-twist) anything in between will only have partial twists and will
end up not being closed as such.  SA just defines the twist angle that the
mobius starts at (the start position is at the +x axis and runs ccw around
the y-axis).  Increasing SA from 0 to 360 will have the effect of the whole
mobius twisting around the NA, but won't add to the number of twists.
Increasing Nr from 0 to 4 will  (BTW 4*180 = 720!) cause more twists to be
added to the mobius, but as it increases between full twists, it will not be
closed.  There is no way to get from 0 twists to one complete 180 twist
smoothly without this happening.

-tgq

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"TinCanMan" <Tin### [at] hotmailcom> wrote in message
news:3d37fd9d$1@news.povray.org...
>  (BTW 4*180 = 720!)

Doh!! ;-)

Thanks for the info.

Andy

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*starring at it for several times*
Hey, that's funky!
Is it plain old CSG kept smooth with many, many pieces? Or some isosurface?

cukk

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"KalleK" <kal### [at] gmxde> wrote in message news:3d384e90@news.povray.org...
> *starring at it for several times*
> Hey, that's funky!
> Is it plain old CSG kept smooth with many, many pieces? Or some
isosurface?
>
> cukk
>
mesh2 object created with a macro.  See p.b.s-f for the file.

-tgq

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"Andrew Cocker" <mai### [at] mariner9net> wrote in
news:3d37da15@news.povray.org 

Beautiful :))

-- 

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> kolejny atak na centrale TPSA
- Expert vel Jacek (obecnie gol### [at] pocztaonetpl)

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