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    Triangle Sets in PHIGS PLUS: a Valuable Link with Finite Element Modeling
    (Blackwell Science Ltd and the Eurographics Association, 1991) Bakker, Miente
    At the ISO/IEC editing meeting on PHIGS PLUS1 in Villars sur Ollon, Switzerland from 9 to 14 September 1990, an additional output primitive was added to PHIGS PLUS: TRIANGLE SET 3 WITH DATA together with its 2D shorthand. The principal reason for that addition was that only triangular primitives admit uniquely defined interpolation of data (colours, normals, etc.) across the facet.However, an additional advantage of this new primitive is its value for the visualization of scientific computing results. It corresponds in a very pleasant way with the Finite Element Method using piecewise linear blending functions on a triangular partition of the function domain.In this paper, an outline will be given of the possible use of this function by Finite Element engineers.1983 CR Categories: G.1.1, G.1.2,I.3.2,I.3.5,I.3.7, J.6.
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    At Last an ISO C Binding of GKS
    (Blackwell Science Ltd and the Eurographics Association, 1991) Bakker, Miente
    The C4 bindings of GKS1 and other semantic computer graphics standards like GKS-3D2 and PHIGS3 are long overdue. While GKS was completed in 1985 and GKS-3D2 (and PHIGS3) became an international standard in 1988, none of their C bindings could be standardized, for the simple reason that the C language itself was not a standard. Instead, a host of de facto GKS/C bindings9 appeared.This paper will give the flavour of the ISO C binding5,6 of GKS- the main features will be outlined.1983 CR Categories: D.3.0,I.3.0,I.3.4.
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    Parametric Surfaces in PHIGS PLUS: a New Chance for Patterning and Hatching?
    (Blackwell Publishing Ltd and the Eurographics Association, 1990) Bakker, Miente
    The Polygon Fill style PATTERN and HATCH, which are quite successful in 2D graphics standards as GKS1 and CGI2 have proved to be less suitable for 3D graphics standards as GKS-3D3 and PHIGS4. However, the emerging standard PHIGS PLUS5 offers a unique chance to successfully employ these Interior Styles (under another name and in a slightly different form), because PHIGS PLUS supports a.o. topologically rectangular parametric surfaces In this article it is shown how these Interior Styles could be efficiently applied to curved surfaces in PHIGS PLUS. In addition, the possible interaction between the tessellation method and the patterning is shown.