On 2010-04-26 03:30, Jay Litwyn wrote:
Roger Alexander quoted a formula in fractint.frm
GenInvMand_rjr { ; Jm Collard-Richard and rjr 2k03 c=z=1/pixel+p1: z=fn1(z)*fn2(z+p2)+fn3(fn4(c)) |z|<=4 ;SOURCE: fractint.frm }
; Notice that fn3(fn4(c)) is a constant. In a re-entrant function, constant input yields constant output, ; so the formula can be sped up quite a bit like this:
GenInvMand_rjr { ; Jm Collard-Richard and rjr 2k03 z=1/pixel+p1, c=fn3(fn4(z)): z=fn1(z)*fn2(z+p2)+c |z|<=4 ;SOURCE: fractint.frm }
Thanx for the input. I modded this formula ages ago using the monkey at the keyboard approach-throw enough, something sticks! My grasp of fractal math is shaky at best and I will rewrite the formula before I use it the next time. Cheers, Roger