26 Apr
2010
26 Apr
'10
3:32 a.m.
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 }