kleines Entwerfen "gesteckt nicht geschraubt"
G. Wurzer, W.E. Lorenz, S. Swoboda. Im Zuge der Lehrveranstaltung wird die Digitalisierung vom Entwurfsprozess bis zur Produktion an Hand einer selbsttragenden Holzstruktur untersucht: vom Stadtmöbel über die Skulptur zur Brücke. ...
Visual representation of adjacencies
eCAADe SIGraDi 2019 - Architecture in the Age of the 4th Industrial Revolution. (paper & talk)
W Lorenz, G. Wurzer. This paper is based on the assumption that a key challenge of good design is spatial organisation as a result of functional requirements. The authors present a new NetLogo application that assists designers to understand the proposed functional relationships (of spaces) by visualizing them graphically. ...
kleines Entwerfen customized bricks
G. Wurzer, W.E. Lorenz, S. Swoboda. Nach positiver Absolvierung der Lehrveranstaltung sind Studierende in der Lage algorithmisch zu Denken. Durch das Präzisieren der Problemstellung sind die Studierenden in der Lage den sinnvollen Einsatz von Algorithmen im Planungsprozess gedanklich zu erfassen. ...
Another category of fractals represents the so-called chaotic, non-linear fractals. This fractal type is connected with the theory of chaos, and its elements are obtained by a simple mathematical equation .For visualizing them, each point on the paper or screen is related to a certain number - e.g. in the case of the “Mandelbrot set” this is a complex number. This number is then iterated, that means it is used in a formula and the new number resulting from that is then again used in the same formula, which leads to the next iteration. This sequence of operations is "similar" to the work of the "copy-machine" of linear fractals - with regard to insertion.
The insertion is repeated until the numerical values approach infinity, converge or fluctuate between several numbers. Depending on the result, the original point may be colored differently.
3.2.1 The Mandelbrot Set
The Mandelbrot-fractal itself is the picture of the Mandelbrot set - the Mandelbrot set being the numerical set of the complex numbers for that is valid if, being repeatedly put into the formula , the absolute value remains a finite number . The plane in which it is drawn is called the complex plane where each point represents a complex number of the form C=a+bi - with and . The system of co-ordinates of the plane or screen is defined with the x-axes representing the value of “a” respectively “X” and the y-axes the value of “bi” respectively “Yi” with “i” being the root of -1. Numbers multiplied by “i” are called imaginary numbers “b”, those which are not are called real numbers “a”.
For visualizing the set, each pixel of the screen, representing a certain complex number, is iterated in the formula . For each pixel, point, , mostly fixed in the zero point , remains the same but the value of “C=a+bi” is chosen differently. After a certain number of iterations there are two possibilities, first the iteration for a specific “C” diverges to infinity or second it does not diverge but approximates a certain number or fluctuates between several numbers, so-called fix-points. If the iteration remains limited, the analyzed pixel for a specific “C”, is an element of the Mandelbrot set and colored black. If it diverges to infinity mostly the steps are counted and, depending on how fast it diverges, the pixel is given a special color. Then the procedure is repeated for another value of “C” and so on . What is fractal about that are the infinitely small boundaries between being a finite value or jumping between certain numbers and diverging towards infinity - see picture 14.
picture 14: Mandelbrot set and Julia sets
On the left side the sequence of , named “orbit”, is shown for three different starting points “C”: the 1st example converges to a fix-point and the 3rd jumps between two points which means that both starting points “C” belong to the Mandelbrot-set and are colored black. The 2nd example grows very fast from which follows that there is a high probability that reaches infinity and therefore the starting point is colored.
3.2.2 The Julia Sets
The Julia sets use the same formula as for the Mandelbrot set, whereas this time for one certain Julia set, the value of “C” keeps the same and is changing. The behavior of each starting point is examined by iterating it in the formula , whereby the same complex plane as for the Mandelbrot set is applied. Finally the examined point belongs to the Julia set if keeps a finite value. The procedure is repeated for each pixel, containing different starting values , of the screen .
For each value of “C” in the Mandelbrot set there exists one specific Julia set, which shows us that there are unlimited Julia sets as there are infinite points of the Mandelbrot set . Julia sets for points outside the Mandelbrot set look like dust or a disconnected cloud of points, they consist of infinite loose points. Whereas Julia sets for points being elements of the Mandelbrot set itself are connected, which means that each point of the real Julia set, mostly colored black, has a neighboring-point. Those for values of “C” in the heart-shaped main-body of the Mandelbrot set look like rugged, deformed circles - see picture 14.
How can it be proved easily that a certain set is not interrupted? Gaston Julia found out that one only has to analyze the behavior of the critical zero-point, . The resulting picture of “C” is continuous if the set of iterations of these points does not grow too extremely.
 Jürgens Hartmut, Peitgen Heinz-Otto, Saupe Dietmar: Fraktale - eine neue Sprache für komplexe Strukturen, Spektrum der Wissenschaft (9/1989), p.59.