IEEE Computer Graphics and Applications

Issue 2 • March 1989

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Displaying Results 1 - 8 of 8
  • Compositing 3D images with antialiasing and various shading effects

    Publication Year: 1989, Page(s):21 - 29
    Cited by:  Papers (5)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1625 KB)

    A method is proposed for compositing 3-D images produced by different programs, taking depth order into consideration. The method can add the following effects to composited images: antialiased images with scaling are displayed by a simple algorithm; the algorithm can add shading effects due to various types of light, such as area sources and skylight; and ray tracing can be performed in localized... View full abstract»

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  • Spatial transformations for rapid scan-line surface shadowing

    Publication Year: 1989, Page(s):30 - 38
    Cited by:  Papers (17)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1008 KB)

    A novel approach to surface shadowing is presented that is based on a parallel solution to the hidden-surface (visibility) problem. The approach computes visibility along scan lines of a spatial transformation of the surface height data. The transformation aligns in scan lines all potentially occluding points on the surface, allowing rapid 1-D determination of whether a point can be seen by the li... View full abstract»

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  • Boundary evaluation using inner and outer sets: the ISOS method

    Publication Year: 1989, Page(s):39 - 51
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1208 KB)

    A boundary-evaluation algorithm for constructive solid geometry is presented for representations in which the primitives can be bounded by complex surfaces (such as splines) as well as by simpler polynomial surfaces. A fundamental part of the algorithm is the spatial decomposition of each primitive in a way that yields three planar bounded volumes, one containing the primitive (outer set), one con... View full abstract»

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  • Curvature and the fairness of curves and surfaces

    Publication Year: 1989, Page(s):52 - 57
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (531 KB)

    The use of curvature plots for the design of curves that have to meet aesthetic requirements is discussed. The aim is to emphasize the usefulness of curvature as a measure for curve fairness. A local method to optimize the curvature plot of a given cubic spline curve is presented. It automatically determines where the curve is to be faired and can be applied repeatedly. A straightforward generaliz... View full abstract»

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  • Faster plots by fan data compression

    Publication Year: 1989, Page(s):58 - 66
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (652 KB)

    A fan data compression method is presented that tripled laser printer speed for Bode and simulation plots with many points. This reduced printer delays without the expense of a faster laser printer, and it saved computer time as well. The authors describe their problem, solution, and conclusions. They give the fan algorithm and present its performance for several applications. They include a pseud... View full abstract»

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  • A pyramidal data structure for triangle-based surface description

    Publication Year: 1989, Page(s):67 - 78
    Cited by:  Papers (83)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1093 KB)

    A hierarchical model for approximating 2-1/2-dimensional surfaces is described. This model, called a Delaunay pyramid, is a method for compression of spatial data and representation of a surface at successively finer levels of detail. A Delaunay pyramid is based on a sequence of Delaunay triangulations of suitably defined subsets of the set of data points. A triangle-oriented encoding structure fo... View full abstract»

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  • Jim Blinn's corner-return of the Jaggy (high frequency filtering)

    Publication Year: 1989, Page(s):82 - 89
    Cited by:  Papers (14)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (554 KB)

    The antialiasing problem of filtering out high frequencies before sampling is considered. The techniques examined are simple filters, box filters, the triangle or tent filter, Gaussian and similarly shaped filters, and the ideal filter. The use of subsampling and the effect of D/A (digital-to-analog) converters are discussed.<> View full abstract»

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  • Comments, with reply, on 'Display of surfaces from volume data' by M. Levoy

    Publication Year: 1989, Page(s):90 - 91
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (187 KB)

    The commenter clarifies some of the terminology used by M. Levoy (see ibid., vol.8, no.3, p.29-37, May 1988) and puts it into historical perspective with other terminology in use in medical imaging today. He takes exception to Levoy's use of the term 'volume rendering'. He also discusses his prior use of the term 'gradient shading' and suggests that it be renamed 'distant gradient shading' to dist... View full abstract»

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IEEE CG&A bridges the theory and practice of computer graphics. From specific algorithms to full system implementations, CG&A offers a unique combination of peer-reviewed feature articles and informal departments, including product announcements.

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L. Miguel Encarnação
The QED Group