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  • 1
    ISSN: 1432-2315
    Keywords: Constraints ; Modeling ; Animation ; Simulation ; Dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper presents an integrated set of methods for the automatic construction and interactive animation of solid systems that satisfy specified geometric constraints. Displacement contraints enable the user to design articulated bodies with various degrees of freedom in rotation or in translation at highes and to restrict the scope of the movement at will. The graph of constrained objects may contain closed loops. The animation is achieved by decoupling the free motion of each solid component from the action of the constraints. We do this with iterative tunings in displacements. The method is currently implemented in a dynamically based animation system and takes the physical parameters into account while reestablishing the constraints. In particular, first-order momenta are preserved during this process. The approach would be easy to extend to modeling systems or animation modules without a physical model just by allowing the user to control more parameters.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2315
    Keywords: Thematic map ; User interface ; Computer mapping ; Human factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Problem analysis in designing thematic maps and user interfaces which assist map designers in incorporating their ideas into maps are presented. Problems in designing choropleth maps are analyzed from the map designers point of view. A graphical user interface, called “Histogram Interface”, is implemented as countermeasure for problems in designing choropleth maps. The user interface can assist map designers in representing their ideas and achieving the desired maps through the designing process. The user interface operations, which correspond to the map designer's ideas, are explained. The user interface effectiveness is confirmed by resulting map examples and the corresponding graphical patterns on the interface. A concept is proposed concerning the importance in any computer graphics field, which the designers should consider in determining how to incorporate their ideas into pictures.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 202-205 
    ISSN: 1432-2315
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 67-67 
    ISSN: 1432-2315
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 194-201 
    ISSN: 1432-2315
    Keywords: Color ; Color contrast ; Color models ; Color selection ; Color spaces ; Color specification ; User-interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract With the introduction of low-cost color graphics systems comes a host of problems specifically concerned with the color aspect of the system. This paper discusses two of these problems: the selection and manipulation of colors by (possibly) inexperienced users, and the automatic selection of colors by the system to achieve high contrast effects on the screen. A new color space based on color opponency theory is described. This space is useful both in the user interface and in the automatic selection of high contrast colors.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 68-68 
    ISSN: 1432-2315
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-2315
    Keywords: Z-buffer ; Shadows ; Annaliasing ; Computer graphics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Shadows are important in enhancing both the realism and the intelligibility of synthetic 2D images of 3D scenes. In order to determine which part of a scene is in shadow, numerous algorithms have been developed. The Z-buffer shadow algorithm and its descendants have proved to be both efficient and easy to implement. However, in casting shadows, the aliasing introduced by the Z-buffer point sampling is notorious. Therefore a new method that is based on a modification of the Z-buffer has been developed. This method deals with the aliasing problem but preserves the strengths of the Z-buffer algorithm. Moreover, as a side effect, the information stored in the modified Z-buffer allows accurate antialiasing of the resulting image.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 69-91 
    ISSN: 1432-2315
    Keywords: Convexity ; Duality ; Parallel coordinates ; Intelligent control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract By means ofParallel Coordinates planar “graphs” of multivariate relations are obtained. Certain properties of the relationship correspond tothe geometrical properties of its graph. On the plane a point ←→ line duality with several interesting properties is induced. A new duality betweenbounded and unbounded convex sets and hstars (a generalization of hyperbolas) and between Convex Unions and Intersections is found. This motivates some efficient Convexity algorithms and other results inComputational Geometry. There is also a suprising “cusp” ←→ “inflection point” duality. The narrative ends with a preview of the corresponding results inR N .
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The visual computer 1 (1985), S. 92-100 
    ISSN: 1432-2315
    Keywords: Algebraic surfaces ; Automated design ; Computer aided design ; Graphics ; Surfaces ; Solid modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A technique for smoothly blending algebraic surfaces and a language for syntactic specification of objects are developed. Their use in automated design is illustrated by a gate valve example in which all fillets, edge roundings and joining surfaces are automatically constructed. The resulting object has an internal representation that is particularly amenable to interactive editing.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-2315
    Keywords: Implicitization ; Inversion ; Intersection ; Resultant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Resultants were originally developed in the 18th and 19th centuries to solve certain simple algebraic problems. Here we shall present some applications of resultants to several important problems in computational geometry, including the implicitization, inversion, and intersection of parametric rational polynomial curves and surfaces.
    Type of Medium: Electronic Resource
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