Marc Schimmler <sch### [at] icauni-stuttgartde> writes:

> Lewis wrote:
> > 
> > Thanks! But what if someone tries to cancel my messages?
> 
> This is not possible! I would have been tempted to do that with -@--
> posts! :-)
> 
> Only the poster can cancel it. And only from the same address if I
> remember right.

Since you can fake your address, it is possible to cancel articles of
other users. I haven't tried it, but I know that it is possible at least
on other newsservers.

Thomas (hoping that Nick won't read this)

-- 
http://www.fmi.uni-konstanz.de/~willhalm

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Thomas

Are you sure about this?  Administrators can delete messages, but
I would think that if I post a message here and go away, turn off
and come back tomorrow, I might not be able to remove even my own
messages.  I'm on DHCP via my ISP, and tomorrow would probably
have a different unique identifier.

Just thinking.....

Cheers
Steve

Thomas Willhalm wrote:
> 
> Marc Schimmler <sch### [at] icauni-stuttgartde> writes:
> 
> > Lewis wrote:
> > >
> > > Thanks! But what if someone tries to cancel my messages?
> >
> > This is not possible! I would have been tempted to do that with -@--
> > posts! :-)
> >
> > Only the poster can cancel it. And only from the same address if I
> > remember right.
> 
> Since you can fake your address, it is possible to cancel articles of
> other users. I haven't tried it, but I know that it is possible at least
> on other newsservers.
> 
> Thomas (hoping that Nick won't read this)
> 
> --
> http://www.fmi.uni-konstanz.de/~willhalm

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interesting images, what was the formulae, again?
(*hint*)

Alex Vandiver wrote:
> 
> With all of these fractals flying around, I decided to dig through a
> book I had lying around.  There's an interesting passage in the book,
> where it is discussing these figures, called 3d dragon curves, and I
> quote,
> "..he uses IBM's computer resources to plot a million or more points in
> three dimensions to generate a three-dimensional dragon curve.  He then
> runs a ray tracing program which determines the illumination of every
> point and the positioning of it on a two-dimensional display.  Needless
> to say, this is beyond the capability of our personal compters."
> The book is a little out of date, apparently.. (published in 1990)  I
> didn't quite use a million points, but I did use 1 out of every 5 of my
> 288000 calculated points.  57600 blobs still makes a pretty funky image,
> tho..
> -Alex V.
> 
>   --------------------------------------------------------------------------------
>  [Image]  [Image]  [Image]

-- 
//Spider    --  [ spi### [at] bahnhofse ]-[ http://www.bahnhof.se/~spider/ ]
And the meek'll inherit what they damn well please
	Get ahead, go figure, go ahead and pull the trigger
		Everything under the gun
			--"Sisters Of Mercy" -- "Under The Gun"

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Marc Schimmler wrote:
> 
> I guess you have serious problems to answer to the right posting! :-)
> 
> You can cancel the ones that have gone wrong with
> 
> EDIT -> cancel message   in your netscape menu.

I just press the delete key. Saves steps and works exactly the same.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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anyone know how to delete your own messages in IE5?

--
Rygad


Marc Schimmler <sch### [at] icauni-stuttgartde> wrote in message
news:37299B55.D1DB3ACF@ica.uni-stuttgart.de...
> I guess you have serious problems to answer to the right posting! :-)
>
> You can cancel the ones that have gone wrong with
>
> EDIT -> cancel message   in your netscape menu.
>
> Have a nice day,
>
> Marc
> --
> Marc Schimmler

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Umm, under "Compose" I think. Cancel message.

GrimDude
vos### [at] arkansasnet

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Spider wrote:

> interesting images, what was the formulae, again?
> (*hint*)

Unfortunatly, I'm not all that clear on the formula, myself, I just thought it looked
interesting.. ;>
Originally, I wrote the code to export the points in Turbo Pascal, but here's the POV
translation of it; make sense of it what you will.  I'm not posting this as a real
macro, though, as it would take way too long to get any number of points.  POV just
doesn't like the serious number crunching..  As soon as I can throw one together, I'll
post a .. *gasp* .. 2d .. image of the dragon curve, which will probably make it more
clear why it's called that..  Hrm.  Actually, as posting of 2d images is unlawful
around
here, I just may have to TGAmosaic it.. *g*
-Alex

---- Code follows ----
-- Oooh! Indention! --

#declare detail = 400;   // Lower numbers make more blobs..
#declare Qval = 0.97064; // Main parameter to change to get different shapes.
                         // Note that Qval=0 doesn't work.. this is actually the
                         // imaginary part of a complex number; P is the real
                         // part.
#declare R = seed(42);

blob {
#declare k = 3;
#while (k >= -3)
  #debug concat(str(k,5,5),"\n")
  #declare tx = 0.50001;
  #declare ty = 0;
  #declare magnitude = (k*k + Qval*Qval);
  #declare Q = (-4*Qval/magnitude);
  #declare P = (4*k/magnitude);
  #declare i = 1;
  #while (i <= 12000)       // Iteration part.  Each iteration is more accurate.
    #declare temp_x = (tx*P - ty*Q);
    #declare ty = (tx*Q + ty*P);
    #declare temp_y = ty;
    #declare tx = (1- temp_x);
    #declare magnitude = sqrt(tx*tx + ty*ty);
    #declare ty = sqrt((-tx+magnitude)/2);
    #declare tx = sqrt((tx+magnitude)/2);
    #if (temp_y < 0)
      #declare tx = (-tx);
    #end
    #if (rand(R) < 0.5)  // 50-50 chance of using the negative square root
      #declare tx = (-tx);
      #declare ty = (-ty);
    #end
    #declare tx = ((1-tx)/2);
    #declare ty = (ty/2);
    #declare tz = (P/2);
    #if (mod(i,detail) = 0)
      sphere {<tx,ty,tz>,0.0625,1  pigment {rgb vnormalize(<tx,ty,tz>)} finish {phong
1/(1+sqrt(tx*tx + ty*ty))}}
    #end
    #declare i = (i+1);
  #end
  #declare k = (k - 0.025);
#end
}

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Here's the promised 2d image.  It uses the same function, but only takes a
crossection.  If
you stretch your imagination, it *might* look like a dragon..
-Alex

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Attachments:
Download '2ddrag.jpg' (45 KB)

Preview of image '2ddrag.jpg'

Interesting. Now I know almost nothing about fractals so I don't know if this has
anything to
do with it but the outline of this "dragon curve" looks a bit like the outline of a
julia
fractal. I've posted a julia fractal from Fractint.

Alex Vandiver wrote:

> Here's the promised 2d image.  It uses the same function, but only takes a
crossection.  If
> you stretch your imagination, it *might* look like a dragon..
> -Alex
>
>   ------------------------------------------------------------------------
>  [Image]

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Attachments:
Download 'fract001.gif' (82 KB)

Preview of image 'fract001.gif'

I think you might be on to something here!

I love Fractint, anybody else ever play with it?

Rick
Thomas Lake <tla### [at] homecom> wrote in message
news:372B6AE8.C5B43480@home.com...
> Interesting. Now I know almost nothing about fractals so I don't know if
this has anything to
> do with it but the outline of this "dragon curve" looks a bit like the
outline of a julia
> fractal. I've posted a julia fractal from Fractint.
>
> Alex Vandiver wrote:
>
> > Here's the promised 2d image.  It uses the same function, but only takes
a crossection.  If
> > you stretch your imagination, it *might* look like a dragon..
> > -Alex
> >
>
  ------------------------------------------------------------------------
> >  [Image]
>

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