arch+ech

architecture + technology

PS_Light Sensitive

perforated sheet responsive to light changes in real time


Zeta Kachri, 2009
build with Processing



By introducing structural elements as autonomous and self-organized systems that are able to respond to changes of their context, architecture comes closer to an organic approach that can transform static buildings to interactive and dynamic motivated constructions.


Drawing on the above idea, this research investigates how a perforated sheet can be algorithmically generated as a responsive shading element that can rearrange its form due to real time light changes.







research objectives

1. Algorithm for the generation of the perforated sheet


The main part of the research was to find out the most appropriate programming method for generating the perforated sheet. After researching in several fields, it was decided that a one-dimensional cellular automaton rule was the most appropriate for generating the morphogenetic structure of the perforated sheet. Based on a specific rule that is given at the beginning each cell of the grid has two possible states that are based on the values of its neighbours. Because the rule of updating remains the same the cellular automata rule ensures a balanced and uniform result of different forms that can be generated depending on the requirements of every case. The two states define the density of the perforated sheet and can affect and define the area and the shape of the holes or the area of the static and dynamic parts or even the combination of shapes. In the example that is going to be analyzed at this paper, the rule specifies the fixed and dynamic parts of the perforated sheet and thus their shape and the final form.






2. Responsiveness to real time changes


The second phase was to reorganize the perforated sheet as a system with physics and dynamics that could move physically responding to real time changes. For this purpose, traer.physics library, which is responsible for particle systems, was used. By using particles with forces and specific characteristics, the virtual perforated sheet can be simulated, analyzed and organized for possible future fabrication of a physical piece that could be dynamically motivated. Furthermore, in terms of response to real time light changes the first generated cells are divided to smaller shapes, which are also adapted to the particle system.







3. Enlarging the constructive mechanism




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