Issue 1

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https://diglib.eg.org/handle/10.2312/99

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    Eurographics
    (Blackwell Publishers Ltd and the Eurographics Association., 2001)
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    Multiresolution for Algebraic Curves and Surfaces using Wavelets
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Esteve, Jordi; Brunet, Pere; Vinacua, Alvar
    This paper describes a multiresolution method for implicit curves and surfaces. The method is based on wavelets, and is able to simplify the topology. The implicit curves and surfaces are defined as the zero-valued piece-wise algebraic isosurface of a tensor-product uniform cubic B-spline. A wavelet multiresolution method that deals with uniform cubic B-splines on bounded domains is proposed. In order to handle arbitrary domains the proposed algorithm dynamically adds appropriate control points and deletes them in the synthesis phase.
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    Displacement Mapping using Scan Conversion Hardware Architectures
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Doggett, Michael; Kugler, Anders; Strasser, Wolfgang
    This paper presents a novel algorithm and architectures for perspective correct displacement of the surface geometry of a polygonal model using a displacement map. This new displaced surface geometry is passed onto a traditional rendering pipeline. The algorithm uses a multiple pass approach in which the geometry is displaced in the first pass and then the displaced geometry is rendered. The significant features of the algorithm are that the surface is displaced after its triangle mesh is transformed into screen space and that it uses only bi-linear interpolation for calculating the displaced geometry allowing a cheap incremental scan-line implementation. A hardware architecture based on this algorithm is presented along with possible alternative implementations. The technique presented here allows greater photorealism by using increased detail without an increase in bandwidth for geometry or calculation time for transformation.
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    The John Lansdown Award
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Jones, Huw; Willis, Phil
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    Alain Fournier, 1943-2000 An Appreciation
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Fiume, E.
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    Editorial
    (Blackwell Publishers Ltd and the Eurographics Association., 2001)
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    Visualizing Stars and Emission Nebulas
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Nadeau, David R.; Genetti, Jon D.; Napear, Steve; Pailthorpe, Bernard; Emmart, Carter; Wesselak, Erik and Davidson, Dennis
    We describe star and nebula visualization techniques used to create a 3D volumetric visualization of the Orion Nebula. The nebula's ionization layer is modeled first as a surface model, derived from infrared and visible light observations. The surface model is imported into a volume scene graph-based visualization system that uses procedural volume modeling to simulate the nebula's emissive gas layers. Additional scene graphs model proplyds and shock fronts within the nebula. Stars are rendered using Gaussian spots that are attenuated with distance. Finally, eighty-six separate volumes are voxelized from these scene graphs, then simultaneously volume rendered.
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    A Recursive Subdivision Algorithm for Piecewise Circular Spline
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Nasri, Ahmad H.; Van Overveld, C. W. A. M.; Wyvill, Brian
    We present an algorithm for generating a piecewise G1 circular spline curve from an arbitrary given control polygon. For every corner, a circular biarc is generated with each piece being parameterized by its arc length. This is the first subdivision scheme that produces a piecewise biarc curve that can interpolate an arbitrary set of points. It is easily adopted in a recursive subdivision surface scheme to generate surfaces with circular boundaries with pieces parameterized by arc length, a property not previously available. As an application, a modified version of Doo-Sabin subdivision algorithm is outlined making it possible to blend a subdivision surface with other surfaces having circular boundaries such as cylinders.
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    Antialiasing of Environment Maps
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) Schilling, Andreas
    Environment maps, like texture maps or any other maps consisting of discretely stored data have to be properly filtered, if they are being resampled in the process of rendering an image. For environment maps, this is especially important, as the sampling rate is subject to extreme changes due to the curvature of the reflecting surfaces. However, for the same reason, the antialiasing is especially difficult to perform, as the sampling rate has to be determined for each pixel. We introduce a method to perform this calculation and determine the parameters for anisotropic filtering of the environment map. Instead of the BRDF, we employ roughness pyramids to account for the properties of the reflecting surface. The principles that are used to perform this antialiasing can be applied for antialiasing reflected textures in general e.g. in ray tracing.
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    Erratum: Conflict Neutralization on Binary Space Partitioning
    (Blackwell Publishers Ltd and the Eurographics Association., 2001) James, A.; Day, A. M.