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A ConfectionPeriod 17 MinibrotPeriod 18 Julia (periodic bailout)
Period 17 Minibrot
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Description: Just a quick example from the standard z^2+c Mandelbrot that I created when testing my new periodic bailout formula, rendered exactly as seen (i.e. at 640*480) with the divergent area in black and max. iterations set to 10000.
The divergent bailout was 65536, the convergent bailout was 1e-8, the centre is:
-0.7325973162545/-0.216460853226
with magnification:
2018.8244
The coloured areas are periods 17,34,51,68,85,102 and 119 simply coloured using smooth iterations with the ArcTan transfer function.
The render took around 2mins 50 secs using just one thread on my 3GHz P4HT - one thread as I'm still using the "DEBUG" option occaissionally and using more than one thread produces confusing compiler message output.
You can see slight errors for instance where the higher periodic areas attach to the main period 17 cardoid - the formula does allow the option of increasing the accuracy to almost completely avoid this but at the cost of using much higher iterations internally.
Unfortunately I haven't had as much time to work on the formula and special colourings for it as I hoped so it may be another few days before I finally upload to the UF database.

Edit: I just realised an optimisation for cases like this one so I added an extra option to the user parameters and tried it - with the extra option in use exactly the same image was rendered under the same conditions in 1min 4secs.
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Total Favorities: 0 View Who Favorited
Filesize: 71.23kB
Height: 480 Width: 640
Keywords: period periodic attractor convergent mandelbrot minibrot 
Posted by: David Makin March 15, 2009, 04:35:59 PM

Rating: **** by 1 members.

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