Constructs

noun : an abstract or general idea inferred or derived from specific instances [syn: concept, conception]; verb 1: make by combining materials and parts [syn: build, make]; verb 2: put together out of components or parts [syn: manufacture, fabricate]; verb 3: draw with suitable instruments and under specified conditions, of geometrical figures; verb 4: of past events [syn: reconstruct, retrace]

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Wreath attractor: parameter study

What I call the wreath attrac­tor isn’t a chaotic or strange attrac­tor in the math­e­mat­i­cal sense. But I started using the name and it kind of stuck.

I guess the most we can say is that it’s a transform:

x right p_0 + (x + p_1 sin(p_2 y + p_3)) cos(pi/p_5) + y sin(pi/p_5)
y right p_4  - (x + p_1 sin(p_2 y + p_3)) sin(pi/p_5) + y cos(pi/p_5)

In my imple­men­ta­tion p0 to p4 are nor­mal real para­me­ters with typ­i­cal ranges from –1 to +1 for p1 to p3. p0 and p4 are about 10 times larger. p5 is a spe­cial case and can take only dis­crete val­ues: 0.5, 1, 1.5, 2, 2.5,…

This sys­tem of equa­tions lends itself well to exper­i­men­ta­tion. For exam­ple, lim­it­ing the source, the pos­si­ble start­ing posi­tions of the trac­ing par­ti­cles, has a pro­found impact on the final look. A strik­ing exam­ple is used in the animation. 10 con­cen­tric cir­cles serve as the source and the result­ing image is what you get when the cir­cles are iter­a­tively trans­formed a hun­dred times.

Dur­ing the ani­ma­tion, the para­me­ters p1 to p3 are slightly tweaked from frame to frame. The con­vo­luted geom­e­try is quite sen­si­tive so the changes are smaller than 0.001.  Each frame con­sists of 5 mil­lion par­ti­cle iter­a­tions, tak­ing a few sec­onds to ren­der. The retro flick­er­ing effect is a result of the sta­tis­ti­cal nature of the process,  giv­ing a slightly dif­fer­ent expo­sure each frame.

Wreath attrac­tor para­me­ter study: longer expo­sure from Wblut on Vimeo.

2 Responses to “Wreath attractor: parameter study”

  1. subblue says:

    Very nice indeed. I did a sim­i­lar type of exper­i­ment a while ago with the Gumowski-Mira trans­form (http://www.subblue.com/blog/2008/9/25/gumowski-mira_patterns) but your wreath attrac­tor is par­tic­u­lar pleas­ing with the degen­er­a­tion from the purely geo­met­ric form to some­thing more organic.

  2. Frederik says:

    Inter­est­ing choice of words. For me, it’s the purely geo­met­ric form that is degenerate.

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