Digitally interpreting traditional folk crafts

The cultural heritage preservation requires that objects persist throughout time to continue to communicate an intended meaning. The necessity of computer-based preservation and interpretation of traditional folk crafts is validated by the decreasing number of masters, fading technologies, and crafts losing economic ground. We present a long-term applied research project on the development of a mathematical basis, software tools, and technology for application of desktop or personal fabrication using compact, cheap, and environmentally friendly fabrication devices, including '3D printers', in traditional crafts. We illustrate the properties of this new modeling and fabrication system using several case studies involving the digital capture of traditional objects and craft patterns, which we also reuse in modern designs. The test application areas for the development are traditional crafts from different cultural backgrounds, namely Japanese lacquer ware and Norwegian carvings. Our project includes modeling existing artifacts, Web presentations of the models, automation of the models fabrication, and the experimental manufacturing of new designs and forms

Morphological shape generation through user-controlled group metamorphosis

Morphological shape design is interpreted in this paper as a search for new shapes from a particular application domain represented by a set of selected shape instances. This paper proposes a new foundation for morphological shape design and generation. In contrast to existing generative procedures, an approach based on a user-controlled metamorphosis between functionally based shape models is presented. A formulation of the pairwise metamorphosis is proposed with a variety of functions described for the stages of deformation, morphing and offsetting. This formulation is then extended to the metamorphosis between groups of shapes with user-defined, dynamically correlated and weighted feature elements. A practical system was implemented in the form of plugin to Maya and tested by an industrial designer on a group of representative shapes from a particular domain. © 2013 Elsevier Ltd

Procedural function-based modelling of volumetric microstructures

We propose a new approach to modelling heterogeneous objects containing internal volumetric structures with size of details orders of magnitude smaller than the overall size of the object. The proposed function-based procedural representation provides compact, precise, and arbitrarily parameterised models of coherent microstructures, which can undergo blending, deformations, and other geometric operations, and can be directly rendered and fabricated without generating any auxiliary representations (such as polygonal meshes and voxel arrays). In particular, modelling of regular lattices and cellular microstructures as well as irregular porous media is discussed and illustrated. We also present a method to estimate parameters of the given model by fitting it to microstructure data obtained with magnetic resonance imaging and other measurements of natural and artificial objects. Examples of rendering and digital fabrication of microstructure models are presented

A web oriented function-based volume modeling framework

The paper presents a web-oriented function-based modeling framework utilizing a high-level volume modeling language for defining 3D point sets and their volumetric attributes. We illustrate how function-based modeling allows for advanced control and manipulation of 3D models and associated attributes while at the same time allowing for simplified interfaces and parametrization that is difficult or impossible to achieve in other systems. This and other properties of function-based modeling allows for the creation of modeling interfaces suitable for the casual and novice user on the web

Poly(p-phenylen vinylen)e nach Gilch - Konstitutions- und Morphologieeinflüsse auf die Emissionsfarbe und das Ermüdungsverhalten in organischen LED's

Diese Arbeit beschäftigt sich mit Poly(p-phenylen vinylen)en (PPVs), welche über die „Gilch-Route“ hergestellt und in organischen Leuchtdioden (OLEDs) auf ihr Verhalten hin getestet wurden. Ziel der Untersuchungen war es verlässliche Informationen bezüglich des Einflusses von Konstitution und Morphologie auf die Emissionsfarbe und das Ermüdungsverhalten in organischen Leuchtdioden zu erhalten. Die zentralen Aufgaben dieser Arbeit waren die Optimierung der Reaktionsbedingungen rot-orange emittierender PPVs hinsichtlich möglicher auftretender Defektstrukturen. Weiterhin galt es Gilch-PPVs herzustellen, deren Emissionswellenlängen in den kürzerwelligen Bereich des elektromagnetischen Spektrums verschoben sind. Es sollte geklärt werden auf welche Weise die Emission am effektivsten und zuverlässigsten hypsochrom verschoben werden kann und welche Auswirkungen diese Modifikationen auf die Eigenschaften resultierender Leuchtdioden haben

Procedural function-based spatial microstructures

We propose a new approach to modelling heterogeneous objects containing internal spatial geometric structures with size of details orders of magnitude smaller than the overall size of the object. The proposed function-based procedural representation provides a compact, precise, and arbitrarily parameterized model allowing for modelling coherent microstructures, which can undergo blending, offsetting, deformations, and other geometric operations, and can be directly rendered and fabricated without generating any auxiliary representations. In particular, modelling of regular lattices and porous media is discussed and illustrated. Examples of microstructure models rendering and fabrication using a variety of digital fabrication machines and materials are presented

Multi-scale space-variant FRep cellular structures

Existing mesh and voxel based modeling methods encounter difficulties when dealing with objects containing cellular structures on several scale levels and varying their parameters in space. We describe an alternative approach based on using real functions evaluated procedurally at any given point. This allows for modeling fully parameterized, nested and multi-scale cellular structures with dynamic variations in geometric and cellular properties. The geometry of a base unit cell is defined using Function Representation (FRep) based primitives and operations. The unit cell is then replicated in space using periodic space mappings such as sawtooth and triangle waves. While being replicated, the unit cell can vary its geometry and topology due to the use of dynamic parameterization. We illustrate this approach by several examples of microstructure generation within a given volume or along a given surface. We also outline some methods for direct rendering and fabrication not involving auxiliary mesh and voxel representations