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- Thomas Neumann, Christoph Hornung
- VLDB
- 1982

A CAD database will reach a consistent state only at the end of the design process. This paper provides a framework for transforming the CAD database into the final consistent state. "or this purpose we developed a model of a design object. Each design object can be composed of several representations. Some representations are independent of any other… (More)

- Christoph Hornung, Wolfgang Lellek, Peter Rehwald, Wolfgang Straßer
- Computer Aided Geometric Design
- 1985

An analytical method to determine the visible parts of parametrically defined tensor-product surfaces is described. All vistbility calculations are strictly oriented on the (u, u)-parameter plane. This leads to substantial advantages over visibility algorithms based on the approximation of curved surfaces by sets of planar polygons. The new algorithm allows… (More)

- Josef Pöpsel, Christoph Hornung
- Computers & Graphics
- 1990

-Today's graphics standard for the rendering of scenes with illumination and reflection is defined by PHIGS+. PEX is a proposal to integrate that functionality into the window environment of X. This paper first describes the lighting and shading models of PHIGS+/PEX. Then a comparison of the different shading methods follows. At last, a new shading method,… (More)

- Christoph Hornung
- IEEE Computer Graphics and Applications
- 1984

Faster solutions to 3-D visibility problems and better distribution of multiprocessor systems can be achieved when this new connectivity data algorithm is used.

- Michael Jäger, Utz Osterfeld, Hans-Josef Ackermann, Christoph Hornung
- IEEE Computer Graphics and Applications
- 1993

A personal-computer-based architecture that uses graphics methods to improve cooperative multimedia work over integrated services digital networks (ISDNs) is discussed. The system supports cooperative multimedia work by providing real-time video, graphics, and speech. The system requirements, components, and general architecture are considered, as is the… (More)

- Christoph Hornung
- Computers & Graphics
- 1982

- Christoph Hornung, Michael Jäger, Adelino Santos, Bernhard Tritsch
- The Visual Computer
- 1993

This paper describes the integration of computer-supported cooperative work (CSCW), multimedia, and hyperstructures into a single framework calledCooperative Hyper Media (CHM). The concept of CHM supports groups of users acting on a single hypermedia document. Cooperative HyperMedia is a layered concept that integrates several notions related to the… (More)

- Kawa Nazemi, Matthias Breyer, Christoph Hornung
- HCI
- 2009

- Hans-Josef Ackermann, Christoph Hornung
- Advances in Computer Graphics Hardware V
- 1990

This paper describes an algorithm implementing the Gouraud-shading of triangles and its realization in hardware. Different realizations using span shading hard ware are discussed. Their drawbacks lead to the concept of a triangle shader, designed as an ASIC. Interfaced to a signal processor for geometry computations, this chip will provide an effective and… (More)