At 07:59 AM 2/11/03 -0500, Harold lane wrote: Anyone - in JackOTradez's posting to this forum on Sun, 9 Feb 2003 he includes a set of parameters and the formula it refers to. When I use these I get a solid blue screen. REPLY: The original post does not work because the 'frm:' has been omitted before the formula name. Save this letter as a text file with a .par extension and it will run correctly. The image is really quite good. The first few lines are black, so don't be concerned when nothing appears on the screen for a minute or so. Jim M. --------------------------------------------------------- 6ml08402 { ; Image Copyright 2000 by Lee H. Skinner ; Version 2000 Patchlevel 8 reset=2000 type=formula formulafile=mmix_lak.frm formulaname=mmix4-lake-0084 function=ident passes=1 center-mag=-27.441/-0.000702002/11.62791/1/90 params=0/0/33.33/0/0.2/300 float=y maxiter=2500 bailout=25 inside=0 logmap=9 symmetry=none periodicity=10 colors=000D`z<3>7hz5kz4mz2oz0rz<2>1nv2lu3jt4hr4gq\ <10>CPbDN`EL_<2>GGWGFVGFT<5>EALE9KE9J<3>C6DB5CB5B\ <3>A48937B37<36>rG6sH6tH6<2>xI6zJ5zH5zE6<3>ZF7\ SF7LF7E07707<13>JWHKYIK_J<2>NgL<13>ntmpuorvq<2>xy\ wzzzzzx<10>zyVzySzyQzyNzyKzxH<3>zw7zw8<10>zg3ze3z\ d2<2>z_1zY0yX1<3>rR9pPBnODlMFjK0<8>sh`tkeuni<2>xw\ uzzzzxz<8>z`zzYzzVz<3>yKz<3>f7rb3pY0n<7>W8tW9uWAv\ <3>UEyTFzSHz<7>FZz } frm:MMix4-lake-0084 { ; 6990726 - Formula by Sylvie Gallet & Jim Muth ; MandelbrotMix4 parameters (hard-coded): ; ------------------------- p_p1 = (1,2) p_p2 = (81.5,-100) p_p3 = (-0.95,10000) ; Function: i ; User-selectable Lake parameters: ; ------------------------------- ; real part of p2: 0 = lake transform disabled ; any value between 0 and 100: water level in % of ; the screen height (0 = bottom, 100 = top) ; imag part of p2: phase ; real part of p3: amplitude of the wave (try 0.2) ; imag part of p3: frequency (try 300) ; Lake transformation (Sylvie Gallet) ; ------------------- if (real(p2) > 0 && real(p2) <= 100) level = real(p2) / 100 ; water level phase = imag(p2) ; phase ampl = real(p3) ; amplitude of the wave freq = imag(p3) ; frequency angle = real(rotskew * pi / 180) exp_irot = exp(-flip(angle)) h = 1 / real(magxmag) w = h / 0.75 * imag(magxmag) tanskew = tan(imag(rotskew * pi / 180)) u = 2 * w * exp_irot v = 2 * h * (tanskew + flip(1)) * exp_irot z3rd = center + (-w-h*tanskew - flip(h)) * exp_irot z = pixel - z3rd b = imag(conj(u)*z) / imag(conj(u)*v) if (b <= level) dy = level - b z = z + 2*dy * (1+ampl*sin(freq*dy^0.2 + phase)) * v endif pixel = z + z3rd endif ; Modified MandelbrotMix4 formula (Jim Muth) ; ------------------------------- a = real(p_p1) , b = imag(p_p1) , d = real(p_p2) , f = imag(p_p2) g = 1/f , h = 1/d , j = 1/(f-b) , z = (-a*b*g*h)^j k = real(p_p3) + 1 , l = imag(p_p3) + 100 , c = fn1(pixel) : z = k*(a*(z^b) + d*(z^f)) + c |z| < l } ------------------------------------------------