“Spherical shading” by Porter

  • ©Thomas (Tom) K. Porter

Conference:


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Title:

    Spherical shading

Presenter(s)/Author(s):



Abstract:


    Hidden surface algorithms in three-dimensional computer graphics have relied on polygons and patches as primitive objects. Spheres are shown to be computationally feasible for transforming and shading. A fast algorithm is presented for the shaded surface display of intersecting spheres. Problems of aliasing common to polygonbased images are resolved. The contribution to molecular graphics is demonstrated.

References:


    1. Bresenham, J. E. An incremental algorithm for digital display of circular arcs; Communications of the ACM 20, 2 (February 1977), 100-106. 

    2. Bui Tuong Phong. Illumination for computer generated pictures. Communications of the ACM 18, 6 (June 1975), 311-317. 

    3. Catmull, E. A subdivision algorithm for computer display of curved surfaces. UTEC-CSc-74-133, U. of Utah, December 1974.

    4. Crow, F. C. The aliasing problem in computer-generated shaded images. Communications of the ACM 20, 11 (November 1977), 799-805. 

    5. Gouraud, H. Computer display of curved surfaces. UTEC-CSc-71-113, U. of Utah’, June 1971.

    6. Jordan, B. W., Lennon, W. J., and Holm, B. C. An improved algorithm for generation of non-parametric curves. IEEE Trans. Computers C-22 12(December 1973), 1052- 1060.

    7. Knowlton, K., and Cherry, L. ATOMS–A threed opaque molecule system–for color pictures of space-filling or ball-and-stick models. Computers & Chemistry 1(1977), 161-166.

    8. Myers, A. J. An efficient visible surface algorithm. Report to the National Science Foundation, Grant Number DCR 74-00768A01, July 1975.

    9. O’Rourke, J. Representation and display of three dimensional objects with spheres. Masters Thesis, U. of Pa, August 1977.

    10. Watkins, G. S. A real time visible surface algorithm. UTEC-CSc-70-101, U. of Utah, June 1970.


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