Period 18 Julia (periodic bailout)

[David Makin]

Period 18 Julia (periodic bailout)



http://www.fractalforums.com/index.php?action=gallery;sa=view;id=491

Hi, this is a period 18 Julia Set rendered by bailing out when the period is discovered and coloured using a mixture of smooth iterations and the real value of z at bailout.
Normal divergent bailout was also used but that area is just coloured black.
Just one layer - the colouring formula used was mmf3:Extended Cilia and max. iterations was set to 10000 with a convergent bailout test value of 1e-8 and a divergent bailout of 65536.
Note that because this is a Julia Set with only one period involved no extra iterations were required beyond the initial bailout.

It was rendered to disk at 3840*2880 without AA and took about 11mins on a (heat challenged) 3GHz P4HT.

The fractal formula used is still WIP but I hope to finish it this week

[Adam Majewski]

Great image. Can you show source code ? You use a divergent bailout of 65536 ? Why not 2 if you are making exterior all black ?

[David Makin]

I realise this is a little late......all code included in the UPR.


Using 65536 is just habit from using colourings that require higher bailouts for accuracy.

[Adam Majewski]

Thx.

It is 3500 lines of code
Probably  your own program in c should be shorter.