“Shadow algorithms for computer graphics” by Crow

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Title:

    Shadow algorithms for computer graphics

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Abstract:


    Shadows are advocated for improved comprehension and enhanced realism in computer-synthesized images. A classification of shadow algorithms delineates three approaches: shadow computation during scanout; division of object surfaces into shadowed and unshadowed areas prior to removal of hidden surfaces; and inclusion of shadow volumes in the object data. The classes are related to existing shadow algorithms and implementations within each class are sketched. A brief comparison of the three approaches suggests that the last approach has the most appealing characteristics.

References:


    1. Appel, A., The Notion of Quantitative Invisibility and the Machine Rendering of Solids, Proceedings ACM 1967 National Conference. 
    2. Appel, A., Some Techniques for Shading Machine Renderings of Solids, 1968 SJCC, AFIPS Vol. 32.
    3. Appel, A., On Calculating the Illusion of Reality, IFIP 1968.
    4. Bouknight, W. J., A Procedure for the Generation of 3-D Half-Toned Computer Graphics Presentations, CACM, Vol. 13, no. 6, Sept. 1970.
    5. Bouknight, W. J. and Kelley, K., An Algorithm for Producing Half-Tone Computer Graphics Presentations with Shadows and Moveable Light Sources, 1970 SJCC, AFIPS Vol. 36.
    6. Bui Tuong Phong and Crow, F. C., Improved Rendition of Polygonal Models of Curved Surfaces, Proc. of the 2nd USA-Japan Computer Conf., 1975.
    7. Clark, J. H., Hierarchical Geometric Models for Visible Surface Algorithms, CACM, Vol. 19 no. 10, Oct. 1976. 
    8. Crow, F. C., The Aliasing Problem in Computer-Synthesized Shaded Images, Dept of Computer Science University of Utah, UTEC-CSc-76-015, March 1976. (abridged version to appear in CACM)
    9. Newell, M. G., Newell, R. G. and Sancha, T. L. A Solution to the Hidden-Surface Problem, Proceedings of the 1972 ACM National Conference.
    10. Newell, M. G., The Utilization of Procedural Models in Digital Image Synthesis, Department of Computer Science, University of Utah, UTEC-CSc-76-218, Summer 1975.
    11. Sutherland, I. E., Polygon Sorting by Subdivision: A Solution to the Hidden-Surface Problem, Unpublished, 1973.
    12. Sutherland, I. E., Sproull, R. F. and Schumaker, R. G., A Characterization of Ten Hidden-Surface Algorithms, Computing Surveys, Vol. 6, No. 1, March 1974. 

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