Wolfgang Lellek

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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)
memory and a Reality graphics board. In all the video segments, the control over I Dif i via T Dif (Equation (4)) and I Sil i via T Sil (Equation (5)) is demonstrated, as well as the ability to generate several frames per second of line art drawings in various styles. The video segments include: A recording of the wavy torus with three stroke styles, along(More)
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