My personally (!) implemented fourth order Runge-Kutta algorithm calcluated
two million points in about five seconds. Not bad? (Or so I'd like to
believe.) This is a two hour render, moslty because of the depth-four
antialiasing with threshold zero. (Threshold 0.01 made some of the thin
lines dissappear, so I thought what the heck and went to dinner. :)

Problem: The region where the lower "wing" is partially covered with the
upper one is kind of messy. I guess it is because of the nature of
aliasing/antialiasing. Would depth 5 or higher have any effect? What about
renering larger and rescaling? I don't have time for such things right now,
though ...

Regards.

--
---------------------------------------------
Simen Kvaal

Student at the faculty of mathematics and
natural sciences, University of Oslo, Norway.
Webmaster for \hbar (Fysikkforeningen).

e-mail: sim### [at] studentmatnatuiono
web: http://www.uio.no/~simenkv/
---------------------------------------------

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Attachments:
Download 'l2.gif' (124 KB)

Preview of image 'l2.gif'

My hat's off to you. You've managed to make an excellent [Anthony] Lawrence
attractor. I must see the source for this thing...

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Simen Kvaal wrote:

> My personally (!) implemented fourth order Runge-Kutta algorithm calcluated
> two million points in about five seconds. Not bad? (Or so I'd like to
> believe.) This is a two hour render, moslty because of the depth-four
> antialiasing with threshold zero. (Threshold 0.01 made some of the thin
> lines dissappear, so I thought what the heck and went to dinner. :)

For some scene, you may want to render at, say, a resolution of 8k x 6k and
then use some intelligent viewer to resize to a more modest size. This usually
deals with aliases due to very small objects.

By the way, care to share the implementation of the R-K algorithm ?


Best,

    S.



>
>
> Problem: The region where the lower "wing" is partially covered with the
> upper one is kind of messy. I guess it is because of the nature of
> aliasing/antialiasing. Would depth 5 or higher have any effect? What about
> renering larger and rescaling? I don't have time for such things right now,
> though ...
>
> Regards.
>
> --
> ---------------------------------------------
> Simen Kvaal
>
> Student at the faculty of mathematics and
> natural sciences, University of Oslo, Norway.
> Webmaster for \hbar (Fysikkforeningen).
>
> e-mail: sim### [at] studentmatnatuiono
> web: http://www.uio.no/~simenkv/
> ---------------------------------------------
>
>  [Image]



--
----------------------------------------------------------
Steven Pigeon                     Ph. D. Student.
University of Montreal.
pig### [at] iroumontrealca           Topics: data compression,
pig### [at] jspumontrealca          signal processing,
ste### [at] researchattcom           non stationnary signals
                                  and wavelets.
----------------------------------------------------------
         http://www.iro.umontreal.ca/~pigeon

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>
> By the way, care to share the implementation of the R-K algorithm ?
>

Sure. Is it any group where it fits naturally to post C++ code? I saw
bin.prog. and pov.prog, but it seems it is a bit off topic ...

Simen.

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Simen Kvaal wrote:
> 
> >
> > By the way, care to share the implementation of the R-K algorithm ?
> >
> 
> Sure. Is it any group where it fits naturally to post C++ code? I saw
> bin.prog. and pov.prog, but it seems it is a bit off topic ...

povray.binaries.utilities would be about as close as you could get...

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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Source posted in p.b.u.

-Simen.

Ken insisted at:
> povray.binaries.utilities would be about as close as you could get...

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Ok compiled the application and ran the two million points... ( way more than
5 seconds for me )
What am i supposed to do with them to produce the image here...
I tried using a 3d spline... I just get one curved line... Not all the
connected lines you see in your pict...

Simen Kvaal wrote:

> My personally (!) implemented fourth order Runge-Kutta algorithm calcluated
> two million points in about five seconds. Not bad? (Or so I'd like to
> believe.) This is a two hour render, moslty because of the depth-four
> antialiasing with threshold zero. (Threshold 0.01 made some of the thin
> lines dissappear, so I thought what the heck and went to dinner. :)
>
> Problem: The region where the lower "wing" is partially covered with the
> upper one is kind of messy. I guess it is because of the nature of
> aliasing/antialiasing. Would depth 5 or higher have any effect? What about
> renering larger and rescaling? I don't have time for such things right now,
> though ...
>
> Regards.
>
> --
> ---------------------------------------------
> Simen Kvaal
>
> Student at the faculty of mathematics and
> natural sciences, University of Oslo, Norway.
> Webmaster for \hbar (Fysikkforeningen).
>
> e-mail: sim### [at] studentmatnatuiono
> web: http://www.uio.no/~simenkv/
> ---------------------------------------------
>
>  [Image]

Post a reply to this message