Issue 4
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Item Modeling and Rendering of the Atmosphere Using Mie-Scattering(Blackwell Publishers Ltd and the Eurographics Association, 1997) Jackel, D.; Walter, B.This paper presents a method for rendering of the atmosphere by means of Mie-scattering. The method is based on a concentric atmospheric model, which is divided into four submodels: for clear air, aerosol, ozone, and rain. In order to simulate and visualize the various atmospheric effects, each of these submodels can be parameterized by the user as desired. The process of rendering an outdoor scene requires an enormous amount of computing power. In order to make this method suitable for efficient implementation, some simplifications and approximations are discussed. In addition, a selection of the rendering results are presented, and our further activities in the field of atmospheric rendering are discussed.Item Calendar of Events(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Fifteenth Annual Conference Eurographics UK â 97: University of East Anglia, Norwich, March 24-26, 1997(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Surface Reconstruction Using Alpha Shapes(Blackwell Publishers Ltd and the Eurographics Association, 1997) Guo, Baining; Menon, Jai; Willette, BrianWe describe a method for reconstructing an unknown surface from a set of data points. The basic approach is to extract the surface as a polygon mesh from an ?-shape. Even though alpha shapes are generalized polytopes having complicated internal structures, we show that manifold surfaces, with or without boundaries, can be efficiently generated, and these surfaces completely describe the ?-shapes to the extent that they are visible from outside. Unlike the original ?-shapes, the polygonal surfaces can be easily simplified to yield compact models suitable for a variety of geometric modeling applications such as surface fitting.Item Book Reviews(Blackwell Publishers Ltd and the Eurographics Association, 1997) Howard, TobyItem Eurographics UK Chapter 16th Annual General Meeting: University of East Anglia, Norwich, March 25, 1997(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Editorial(Blackwell Publishers Ltd and the Eurographics Association, 1997) Coquillart, Sabine; Seidel, Hans-PeterItem The Open Inventor Toolkit and the PREMO Standard(Blackwell Publishers Ltd and the Eurographics Association, 1997) Wang, D.; Herman, I.; Reynolds, G. J.PREMO is an emerging international standard for the presentations of multimedia objects including computer graphics. Open InventorT is a commercially available "de facto" standard for interactive computer graphics packaged as a library of objects. In this paper, we consider whether the concepts and objects of PREMO are sufficient to represent a professional quality system, such as Open Inventor.By comparing PREMO with Open Inventor, we hope to show that PREMOâ s computer graphics environment model and event model can properly describe Open Inventorâ s rendering action and event model. The scene graph is very important in Open Inventor. Most Open Inventor functions rely on various operations over scene graphs. The construction, edition and traversal of the scene graphs are implemented as a set of newly defined PREMO objects. Graphics rendering, event handling and scene graphs constitute the fundamental parts of Open Inventor, other Open Inventor functionalities can be constructed from these. We conclude that since these three fundamental parts of Open Inventor can be properly modelled and implemented by means of PREMO, that the concepts and objects of PREMO are sufficient to represent Open Inventor.Item Interactive Sculpting with Deformable Nonuniform B-splines(Blackwell Publishers Ltd and the Eurographics Association, 1997) Vassilev, Tzvetomir IvanovThis paper describes an efficient method for manipulating deformable B-spline surfaces, based on minimizing an energy functional. The major benefit of the proposed new fairness norm is that it preserves the natural representation of the B-spline surface control points (a two dimensional array) which has an efficiency advantage over other methods. The designer uses forces as a main sculpting tool and is free to specify a single force, a set of isolated forces, forces situated on a line or curve or area of the deformable surface. The user is allowed to modify several parameters and in this way to change the physical properties of the object.Item Network Services(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item From Footprints to Animation(Blackwell Publishers Ltd and the Eurographics Association, 1997) Van De Panne, MichielA method of using footprints as a basis for generating animated locomotion is proposed. An optimization process is used to maximize the physical plausibility and perceived comfort of a motion which is constrained to match given footprint and timing information. The proposed method creates plausible walking, turning, leaping, and running motions for bipedal figures at interactive rates. Autonomous motions are generated using a planning algorithm which dynamically generates new footprints and the associated new motions.Item Eurographics'98(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Eighth Eurographics Workshop on Visualization in Scientific Computing: Boulogne-sur-Mer, France, April 28-30, 1997(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Join Now!(Blackwell Publishers Ltd and the Eurographics Association, 1997)Item Fourth Eurographics Workshop on Graphics and Visualization Education (GVE):Poitiers, France, August 24-25, 1996(Blackwell Publishers Ltd and the Eurographics Association, 1997)