Jay, You said:
Mister Helie is a source of formulas and parameters that do not connect, or that are missing key ingredients, like a bail-out test.
I looked in the Fractint docs and discovered that the particular fractal type that Mister Helie used (potential=) doesn't use a bail-out test in the formula. Instead it's specified by "potential=" The bailout is given on the Y screen or using this syntax in the parameter set: potential=maxcolor[/slope[/modulus[/16bit]]] '"Modulus" is the bailout value used to determine when an orbit has "escaped". Larger values give more accurate and smoother potential. A value of 500 gives excellent results.' Mister Helie uses: potential=256/200/4 I was able to calculate his fractal OK after doing a couple of minor adjustments to it (like adding "frm:" in front of the formula name.) === Mister Helie's: caun fractal: ======== caun { ; make me think of Opuntia cactus species ; 2011-09-27 post in Fractint reset=2000 type=formula formulafile=caunplus.frm formulaname=caun1 function=sin center-mag=-1.64e-006/2.205e-006/0.6666676 potential=256/200/4 colors=000000_qT<3>Subqg5<58>tv9tv9tv9<3>uxApg5<14>OpFMqGKqH<3>CtKdW`qg5\ <63>S7pS6qR6r<3>P3uchuqg5<58>jC2jB2jB2<3>i81qg6<6>jhKiiMhiO<3>ejVph7djX<\ 5>Zlh } frm:caun1{;Sebastien Helie z=pixel x=real(z/0.66),y=imag(z/0.66) z=sin(x)/sin(y)+sin(z^(2.6/flip(0.46464*z)-0.46340/flip(0.103*z)-fn1(3.1416/ z)/z))+pixel } ############################################################## and you also said:
a.minimum := -2 graph3d.vectoralign := tail graph3d( ( (z)=sin(x)+1/3*sin(3*x)+1/5*sin(5*x)+1/7*sin(7*x)+1 /9*sin(9*x)+1/11*sin(11*x)+1/13*sin(13*x) +cos(time*y) )) (...)
That does not look like fractint source. mat-lab? I agree.
Sebastian mentioned Acrospin in his post, so the code he posted could be for that utility. I've not ever used it. I found some references to this older program: http://www.nahee.com/spanky/www/fractint/other_programs.html ACROSPIN, by David Parker - An inexpensive commercial program that reads an object definition file and creates images that can be rapidly rotated in three dimensions. The Fractint "orbitsave=yes" option creates files that this program can read for orbit-type fractals and IFS fractals Contact: MathWare www.mathware.com (800)255-2468 fax: (217)384-7043 email: info@mathware.com Unfortunately, that web address says: "MathWare no longer retails math software." But, "If you have any questions you can contact us at info@mathware.com" A few more Google searches gave: http://www.fractint.org/fractsvn/branches/ssg/fractint-float/help5.src ACROSPIN, by David Parker - An inexpensive commercial program that reads an object definition file and creates images that can be rapidly rotated in three dimensions. The Fractint "orbitsave=yes" option creates files that this program can read for orbit-type fractals and IFS fractals. Contact: David Parker 801-966-2580\ P O Box 26871 800-227-6248\ Salt Lake City, UT 84126-0871 And this page *may* be more recent: http://www.davidparker.com/ which says: "I may be the person you are looking for if you know of me in connection with: ... AcroSpin..." David Parker 3007 East 3215 South Salt Lake City, Utah 84109-2123 home: 801-487-4491 cell: 801-865-8331 daveparker@flamingthunder.com - Hal Lane ######################## # hallane@earthlink.net ########################