EGGH01: SIGGRAPH/Eurographics Workshop on Graphics Hardware 2001

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https://diglib.eg.org/handle/10.2312/334

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Browsing EGGH01: SIGGRAPH/Eurographics Workshop on Graphics Hardware 2001 by Subject "Computational Geometry"

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    High-Quality Pre-lntegrated Volume Rendering
    (The Eurographics Association, 2001) Engel, Klaus; Kraus, Martin; Ertl, Thomas; Kurt Akeley and Ulrich Neumann
    We introduce a novel texture-based volume rendering approach that achieves the image quality of the best post-shading approaches with far less slices. It is suitable for new flexible consumer graphics hardware and provides high image quality even for low-resolution volume data and nonlinear transfer functions with high frequencies, without the performance overhead caused by rendering additional interpolated slices. This is especially useful for volumetric effects in computer games and professional scientific volume visualization, which heavily depend on memory bandwidth and rasterization power. We present an implementation of the algorithm on current programmable consumer graphics hardware using multi-textues with advanced texture fetch and pixel shading operations. We implemented direct volume rendering, volume shading, arbitrary number of isosurfaces, and mixed moder endering. The performance does neither depend on the number of isosurfaces nor the definition of the transfer functions, and is therefore suited for interactive highquality volume graphics.
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    Watertight Tessellation using Forward Differencing
    (The Eurographics Association, 2001) Moreton, Henry; Kurt Akeley and Ulrich Neumann
    In this paper we describe an algorithm and hardware for the tessellation of polynomial surfaces. While conventional forward difference-based tessellation is subject to round off error and cracking, our algorithm produces a bit-for-bit consistent triangle mesh across multiple independently tessellated patches. We present tessellation patterns that exploit the efficiency of iterative evaluation techniques while delivering a defect free adaptive tessellation with continuous level-of-detail. We also report the rendering performance of the resulting physical hardware implementation.