Today's post is another formula by Kerry Mitchell based on the Julia iteration loop. Gif and jpg version available at http://maxitersfractalfollies.blogspot.com Threaded Julia { ; fract499.gif another Julia iteration loop fractal ; blank ; calctime 0:05:22.08 ; created Nov 04, 2010 ; Fractint Version 2004 Patchlevel 10 reset=2004 type=formula formulafile=kerrym.frm formulaname=km_08 center-mag=-0.730914/0.135225/2.109705 params=0.5243385113071077/0.07968382824182867/-0.8776207770012513/-0.809\ 0762047181616/-0.5746330149235511/0.3112582781456953/-0.8414868617816705\ /0.2847071749015778 float=y maxiter=1500 inside=0 decomp=256 periodicity=0 colors=000734633523422312211101000000100200311411512612723823924A34B35B3\ 5C46D46E46F47G57H58I58J69K69L6AM6AN7BO7BP7BQ8CR8CS8DT9DU9EU9EV9FWAFXAGYA\ GZBH_BH`BHaCIbCIcCJdCJeDKfDKgDLhELiEMjEMkEMlFNlFNmFOnGOoGPpGPqHQrHQsHRtH\ RuISvISwJTwJTwKUwLVwLVwMWwNWwNXwOXwPYwQYwQZwRZxS_xS_xT`xU`xUaxVbxWbxWcxX\ cxYdxZdxZex_ex`fx`fxagxbgxbhxchxdiyejyejyfkygkyglyhlyimyimyjnyknykoyloym\ pynpynqyoqyprypsyqsyrtyrtzsuztuztvzuvzvwzwwzwxzxxzyyzyyzzzzzzzyyzxxzxxzw\ wzvwzvvzuvztuztuzstzrtzqszqszprzorzoqynqympympyloykoyknyjnyimyimyhlyglyg\ kyfkyejyejydiychybhybgyagy`fy`fy_eyZeyZdyYdyXcyXcyWbyVbxVaxUaxT`xT`xS_xR\ _xQZxQZxPYxOYxOXxNXxMWxMWxLVxKUwJTvJTuJTtISsISrIRqIRpHQoHQnHPnGPmGOlGOkF\ NjFNiFNhFMgEMfELeELdDKcDKbDJaCJ`CI_CIZCHYBHYBHXBGWAGVAFUAFTAES9ER9DQ9DP8\ CO8CN8BM7BL7AK7AJ7AI69H69H68G58F57E57D46C46B45A45934834 } frm:km_08 { ; Kerry Mitchell 11may98 ; originally conic-near_jul16 ; tweaked by rjr 2k04 to allow user to directly input ; julia parameters previously hardcoded to 0.2882,0.0106 cc=p4, zc=pixel, maxr=1e12, minr=maxr, iter=1 a=real(p1), b=imag(p1), c=real(p2), d=imag(p2) e=real(p3), f=imag(p3): iter=iter+1, zc=sqr(zc)+cc, x=real(zc), y=imag(zc) conic=|x*(a*x+b)+y*(c*y+d)+e*x*y+f| if (conic<minr) minr=conic end if if ((|zc|>maxr)||(iter==maxit)) iter=-1 t=log(minr) z=cos(t)+flip(sin(t)) end if iter>0 } Roger Alexander