Fractals/fractint

< Fractals

Images

commons:Category:Fractals created with Fractint

Fractint parameters

Fractint image information

Image Calculation Parameters

 CORNERS=[xmin/xmax/ymin/ymax[/x3rd/y3rd]]

"Example: corners=-0.739/-0.736/0.288/0.291 Begin with these coordinates as the range of x and y coordinates, rather than the default values of (for type=mandel) -2.0/2.0/-1.5/1.5. When you specify four values (the usual case), this defines a rectangle: x- coordinates are mapped to the screen, left to right, from xmin to xmax, y-coordinates are mapped to the screen, bottom to top, from ymin to ymax. Six parameters can be used to describe any rotated or stretched parallelogram: (xmin,ymax) are the coordinates used for the top-left corner of the screen, (xmax,ymin) for the bottom-right corner, and (x3rd,y3rd) for the bottom-left. Entering just "CORNERS=" tells Fractint to use this form (the default mode) rather than CENTER-MAG (see below) when saving parameters with the [B] command."[1]

 CENTER-MAG=[Xctr/Yctr/Mag[/Xmagfactor/Rotation/Skew]]

"This is an alternative way to enter corners as a center point and a magnification that is popular with some fractal programs and publications. Entering just "CENTER-MAG=" tells Fractint to use this form rather than CORNERS (see above) when saving parameters with the [B] command. The [TAB] status display shows the "corners" in both forms. When you specify three values (the usual case), this defines a rectangle: (Xctr, Yctr) specifies the coordinates of the center of the image while Mag indicates the amount of magnification to use. Six parameters can be used to describe any rotated or stretched parallelogram: Xmagfactor tells how many times bigger the x- magnification is than the y-magnification, Rotation indicates how many degrees the image has been turned, and Skew tells how many degrees the image is leaning over. Positive angles will rotate and skew the image counter-clockwise."

Mag indicates the amount of magnification to use. Initial value ( no zoom ) is 6.66666667e-01. "If the magnification is set to 1, the range on the Y axis is +1 to -1 - this is zoomed in too much and cuts off some of the top & bottom bulbs on the Mandelbrot set. With magnification set to .666666667, the range on the Y axis is +1.5 to -1.5, which gives a view of the complete Mandelbrot set. " (Ryan Davenport )[2]


/* 
frames.c - frames for endless zoom 
http://www.nahee.com/spanky/www/fractint/loewer/frames.c
Results of Wesley Loewer's Study : 
"The C program, frames.c, was used to generate the batch file, using "frames > tmp.bat" at the command line prompt.   I put the following in my sstools.ini and then ran tmp.bat.

      batch=y
      video=f3
      sound=off
      float=y
      passes=b
      viewwindows=///128/128 
      maxiter=1000
      colors=000_HcaDhc9n<2>YGkD_HEdH76H<2>50GTWJ<2>YLZA7F<73>YQo\
      000<75>IdU111<36>igu102<14>SAi000<13>5815917105A1<14>AJ3
When I stitched them together in an animation, the last frame looks just like the first frame."

*/
 
#include <stdio.h>
#include <math.h>


main(int argc, char *argv[])
{
	int frame, frames;
	double zoom, relzoom, zoomfactor;

    zoom = 1e5; /* seems like a deep enough starting place */
	relzoom = pow(2.0, 2.5*8); /* 2**(2.5 * 8 steps/lap ) */
	frames = 100;
	zoomfactor = pow(relzoom, 1.0 / (frames - 1));
	for (frame = 0; frame < frames; frame++)
	{
		printf("fractint center-mag=0/1/%g\n", zoom);
		zoom *= zoomfactor;
	}
	return 0;
}



/* 
frames45.c - frames at 45 degree increments using autokey option 
http://www.nahee.com/spanky/www/fractint/loewer/frames45.c
Results of Wesley Loewer's Study : 
"The C file, frames45.c, generates an auto.key script to produce the whole sequence of frames via FractInt's "g" command.   
After compiling frames45.c, at the command line prompt, just enter "frames45 > auto.key".   
Then I started FractInt with:

      video=af3 
      float=y
      viewwindows=///128/128 
      passes=b 
      maxiter=5000
      autokey=play
and away it went. "
*/

#include <stdio.h>
#include <math.h>


main(int argc, char *argv[])
{
	int angle, frame, frames;
	double zoomfactor, zoom;

	frames = 100;
	zoomfactor = pow(2.0, 2.5);
	zoom = 1.0; /* looks like a good starting place */
	angle = 0;
	for (frame = 0; frame < frames; frame++)
	{
		printf(
"\"g\"\n"
"\"center-mag=0/1/%g/1.333333/%d\"\n"
"ENTER\n"
"CALCWAIT\n"
"\"s\"\n"
"CALCWAIT\n"
"\"eh..\"\n"
"ESC\n\n"

			, zoom, angle);
		zoom *= zoomfactor;
		angle = (angle + 45) % 360;
	}
	return 0;
}

fractint files

Most important files are :

map

par

"Fractint uses Parameter files[5][6] to save/restore all options and settings,[7] required to recreate particular images. The parameters required to describe an image require very little disk space, especially compared with saving the image itself. " [8]

Parameter files contain named groups of parameters, looking something like this:

    name { ; main comment 
         ....
         } 
      
    quickdraw {      ; a set of parameters named quickdraw
       maxiter=150
       float=no
       }
    slowdraw {       ; another set of parameters named slowdraw
       maxiter=2000
       float=yes
       }

These sections are called parset sections and describe a fractal equation, a view area, parameters and a color palette.[9]

For standard view of parameter plane and Mandelbrot set : 

Mandel_Demo        { ; PAR for initialization of Fractint demo
  reset=1900 type=mandel corners=-2.5/1.5/-1.5/1.5 params=0/0 inside=0
  sound=no
  }

or :[10]

1_01                  { ; quite good spirals 
  reset=2000 type=mandel passes=1
  corners=-0.6014129278/-0.5990935452/0.427747516/0.429487053
  params=0/0 float=y maxiter=1000 inside=0 outside=15
  distest=1/10/320/200 
  }

1_02                  { ; stringy one, with dist estimator
  reset=2000 type=mandel passes=1
  corners=-1.9228429644992/-1.9228427944992/-6.3749991620026e-008/6.375000\
  8379971e-008 params=0/0 float=y maxiter=1000 inside=0 outside=15
  distest=1/20/320/200
  }

1_03                  { ; OK, bit dull, not zoomed in far 
  reset=2000 type=mandel passes=1
  corners=0.3734922373/0.3820837907/-0.243292645/-0.23684898
  params=0/0 float=y maxiter=1000 inside=0 outside=15
  distest=1/10/320/200
  }

1_04                  { ; a mess, needs dist est
  reset=2000 type=mandel passes=1
  corners=-1.862224008886682/-1.86222400040936/-3.214020831358832e-009/3.1\
  43970347410528e-009 params=0/0 float=y maxiter=1000 inside=0
  outside=15 distest=1/10/320/200 
  }

1_05                  { ; A twirly twiddly one 
  reset=2000 type=mandel passes=1
  corners=-0.77464016774366/-0.77463987034365/0.12426328506998/0.124263508\
  11999 params=0/0 float=y maxiter=1000 inside=0 outside=15
  distest=1/10/320/200 
  }

Parameter file for FractInt ( extension PAR) : 

top-mag1500      { ; a really really deep zoom        Wesley Loewer
                   ; highly self similar
                  ; took over 1200 hours at 320x240 on a 486sx/25
                  reset=1920 type=mandel passes=b center-mag=0.0/1.0/1e+1500
                  maxiter=15000  }


Julia set : 

test               {
  reset=2004 type=julia center-mag=0/0/0.6666667
  params=-0.49749687108886109/-0.0025041736227045075 float=y inside=0
  colors=@default.map
  }


To use it :

One can :


Reset causes Fractint to reset all calculation related parameters to their default values. Non-calculation parameters such as "printer=", "sound=", and "savename=" are not affected. [11]The reset=1730 in the parameter file shows that it was created with 17.3 version of Fractint. [12]


Search the code :

grep -R "par file"

result : 

 miscres.c:   /* just to make par file look nicer */
 miscovl.c:               ranges which can be written as <nn> to compress .par file entry.
 printer.c:            /* user might change gammas with a .par file entry mid-run.     */


Lists

Install

References

  1. ↑ fractint Image Calculation Parameters
  2. ↑ Fractaal forum : FractInt > Mag
  3. ↑ Converting between FractInt and Fractal eXtreme palettes
  4. ↑ the KAM map by Fred Schimmel
  5. ↑ A short Introducion to PAR Files by Laurent Chabin
  6. ↑ julian haight : filmer instructions
  7. ↑ Fractint doc index
  8. ↑ Fractint par files by Rupert Russell
  9. ↑ Video for FRACTINT by Chabin Laurent
  10. ↑ Fractint .par file page
  11. ↑ fractint Image Calculation Parameters
  12. ↑ [Fractint] FOTD 27-07-11 (Bad Moon on the Rise [No Rating])
  13. ↑ Fractint deep zoom
  14. ↑ Index of /spanky/pub/fractals/params
  15. ↑ nehee par collection
  16. ↑ fracton links
This article is issued from Wikibooks. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.