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Die Visualisierung und Quantifizierung von Datenfeldern im dreidimensionalen Raum gewinnt in vielen Bereichen von Wissenschaft und Technik mehr und mehr an Bedeutung. Anschauliche Visualisierung der Daten stellt eine Voraussetzung für effektive Kommunikation zwischen Mensch und Maschine dar. Dies läßt sich mit Hilfe der Computergraphik durch die Darstellung von Isoflächen, die einen bestimmten Datenwert repräsentieren, erreichen. Für die Visualisierung zeitabhängiger Resultate (z.B. dynamische Simulationen) sowie zur hochgradig interaktiven Bearbeitung der Daten sind extrem schnelle Computerprogramme zur Generierung dieser Isooberflächen erforderlich. Ein Beispiel für einen derartigen Algorithmus ist die hier vorgestellte Triangulation dreidimensionaler Gitter auf der Basis einzelner Würfel als Gitterelemente.
An algorithm for the generation of a solid molecular surface from a given number of surface points in 3D space is presented. This surface is represented by a triangle mesh. Such a mesh of triangles is not uniquely defined by the position vectors of the surface points, and there is no straight forward algorithm for triangulation. In this paper a hierarchy of algorithms is described which successfully works for the automatic triangulation of molecular surfaces of all sizes. Some examples are given for the application of this solid surface approach in molecular modelling of proteins.
Fast generation of molecular surfaces from 3D data fields with an enhanced "marching cube" algorithm
(1993)
An improved version of the "marching cubes" algorithm [W. Lorensen and H. Cline, Comp. Graph. 21, (1987)] for the generation of isosurfaces from 3D data fields is presented and applied to molecular surfaces. The new algorithm avoids inconsistent pattern definitions of the original one, which lead to artificial gaps. The advantage of a logarithmic interpolation procedure, in particular for data fields typically occurring in molecular science, is demonstrated. An example is the generation of molecular surfaces based upon electron density data.
New strategies for the use of interactive computer graphics for man-machine communication in the field of molecular modelling are described. It is shown that in particular the concept of molecular surfaces is very helpful for the discussion of specific intermolecular interactions: attractive and repulsive forces towards an interaction partner can be mapped by color coding on the molecular surface.
Benches and CAVEs
(1997)
Benches and Caves
(1998)
Augmented Perception - AuPer
(2004)
Der virtuelle Wetterfrosch
(1997)
The Virtual Memory Palace
(2006)
The intention of the Virtual Memory Palace is to help people memorize information by addressing their visual memory. The concept is based on the “Memory Palace” as an ancient Greek memorization technique, where symbols are placed in a certain way within an imaginative building in order to remember the original information whenever the mind goes through the vision of this building again. The goal of this work was to create such a Memory Palace in a virtual environment, so it requires less creative effort of the contemporary learner than was necessary in ancient Greece. The Virtual Memory Palace offers the possibility to freely explore a virtual 3d architectural model and to place icons at various locations within this model. Specific behaviors were assigned to these locations to make them more memorable. To test the benefit of this concept, an experiment with 15 subjects was conducted. The results show a higher remembrance rate of items learned in the Virtual Memory Palace compared to a wordlist. The observations made during the test showed that most of the subjects enjoyed the memorization environment and were astonished how well the Virtual Memory Palace worked for them.
The work being described in this paper is the result of a cooperation project between the Institute of Visual Computing at the Bonn-Rhein-Sieg University of Applied Sciences, Germany and the Laboratory of Biomedical Engineering at the Federal University of Uberlândia, Brazil. The aim of the project is the development of a virtual environment based training simulator which enables for better and faster learning the control of upper limb prostheses. The focus of the paper is the description of the technical setup since learning tutorials still need to be developed as well as a comprehensive evaluation still needs to be carried out.
Virtuelle Umgebungen
(2000)
