Bengt-Olaf Schneider

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To reduce the cost of correcting design errors, assemblies of mechanical parts are modeled using CAD systems and verified electronically before the designs are sent to manufacturing. Shaded images are insufficient for examining the internal structures of assemblies and for detecting interferences. Thus, designers must rely on expensive numerical techniques(More)
This paper gives a short introduction into the field of computer image generation in hardware. It discusses the two main approaches, namely partit:oning in Image space and In object space. Based on the object space partitioning approach we have defined the PROOF architecture. PROOF is a system that aims at high performance and high quality rendering of(More)
Contemporary graphics architectures are based on a hardware: supported geometric pipeline, a rasterizer, a z-buffer and two frame buffers. Additional pixel memory is used for alpha blending and for storing logical information. Although their function-ality is growing it is still limited because of the fixed use of pixel memory and the restricted set of(More)
Rational B-spline surfaces make it possible to merge the concepts of freeform surfaces and that of surfaces described by rational polynomials espe­ cially conic sections. For ray tracing it is crucial to determine the intersection between ray and object. Therefore an algorithm is developed that is suitable for a VLSI implementation. Some alternatives for(More)
Polygon clipping is a central part of image generation and image visualization systems. In spite of its algorithmic simplicity it consumes a considerable amount of hardware or software resources. Polygon clipping performance is dominated by two processes: intersection calculations and data transfers. The paper analyzes the prevalent Sutherland-Hodgman(More)