Issue 1

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https://diglib.eg.org/handle/10.2312/78

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    EG Network Service
    (Blackwell Publishers Ltd and the Eurographics Association, 1997)
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    Join Now!
    (Blackwell Publishers Ltd and the Eurographics Association, 1997)
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    Trends and Developments in Computational Geometry
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) De Berg, Mark
    This paper discusses some trends and achievements in computational geometry during the past five years, with emphasis on problems related to computer graphics. Furthermore, a direction of research in computational geometry is discussed that could help in bringing the fields of computational geometry and computer graphics closer together.
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    Calendar of Events
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Greiner, Gunther
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    Bulge Elimination in Convolution Surfaces
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Bloomenthal, Jules
    The relationship between surface bulge and several implicit blend techniques, particularly those based on convolution of a skeleton, is discussed. An examination of branching skeletons reveals that for two and three-dimensional skeletons, the surface will be bulge-free if skeletal elements are sufficiently large with respect to the convolution kernel.
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    Prize Competition: 1998 Cover Photograph
    (Blackwell Publishers Ltd and the Eurographics Association, 1997)
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    Parallel Progressive Ray-tracing
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Notkin, Irena; Gotsman, Craig
    A dynamic task allocation algorithm for ray-tracing by progressive refinement on a distributed-memory parallel computer is described. Parallelization of progressive ray-tracing is difficult because of the inherent sequential nature of the sample location generation process, which is optimized (and different) for any given image. We report on experimental results obtained from our implementation of this algorithm on a Meiko parallel computer. The three performance measures of the algorithm, namely, load-balance, speedup, and image quality, are shown to be good.
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    EG Eurographics ' 97: Annual Conference of the European Association for Computer Graphics
    (Blackwell Publishers Ltd and the Eurographics Association, 1997)
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    Synthesizing Novel Views from Unregistered 2-D Images
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Havaldar, Parag; Lee, Mi-Suen; Medioni, Gerard
    Synthesizing the image of a 3-D scene as it would be captured by a camera from an arbitrary viewpoint is a central problem in Computer Graphics. Given a complete 3-D model, it is possible to render the scene from any viewpoint. The construction of models is a tedious task. Here, we propose to bypass the model construction phase altogether, and to generate images of a 3-D scene from any novel viewpoint from prestored images. Unlike methods presented so far, we propose to completely avoid inferring and reasoning in 3-D by using projective invariants. These invariants are derived from corresponding points in the prestored images. The correspondences between features are established off-line in a semi-automated way. It is then possible to generate wireframe animation in real time on a standard computing platform. Well understood texture mapping methods can be applied to the wireframes to realistically render new images from the prestored ones. The method proposed here should allow the integration of computer generated and real imagery for applications such as walkthroughs in realistic virtual environments. We illustrate our approach on synthetic and real indoor and outdoor images.
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    Editorial
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Seidel, Hans-Peter; Coquillart, Sabine
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    Book Reviews
    (Blackwell Publishers Ltd and the Eurographics Association, 1997)
    Steinmetz, Ralf and Nahrstedt, Klara. Multimedia: Computing, Communications and ApplicationsStollnitz, Eric J, Derose, Tony D and Salesin, David H. Wavelets for Computer GraphicsPrusinkiewicz, P and Lindenmayer, A. The Algorithmic Beauty of PlantsGeary, David M and McClellan, Alan L. Graphic Java: Mastering the AWTSantos, Adelino. Multimedia and Groupware for EditingMagnenat Thalmann, Nadia and Thalmann, Daniel. Interactive Computer Animation
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    Rendering Caustics on Non-Lambertian Surfaces
    (Blackwell Publishers Ltd and the Eurographics Association, 1997) Jensen, Henrik Wann
    This paper presents a new technique for rendering caustics on non-Lambertian surfaces. The method is based on an extension of the photon map which removes previous restrictions limiting the usage to Lambertian surfaces. We add information about the incoming direction to the photons and this allows us to combine the photon map with arbitrary reflectance functions. By using a cone-filter we improve the quality of the radiance estimate in particular at discontinuities. Furthermore we introduce balancing of the photon map which not only reduces the memory requirements but also significantly reduces the rendering time. We have used the method to render caustics on surfaces with reflectance functions varying from Lambertian to glossy specular.