Research and technical expertise

Published papers and technical reports

Research by Gary Crocker, founder and CTO of IntegrityWare, on computer graphics, geometric and solid modeling, boundary evaluation, and editable nonmanifold representations.

Published papers

  1. 1

    Invisibility Coherence for Faster Scan-Line Hidden Surface Algorithms

    Gary A. Crocker

    Computer Graphics: Proceedings of SIGGRAPH ’84, vol. 18, no. 3, pp. 95–102, July 1984.

    Presents a visibility-coherence method for accelerating scan-line hidden-surface rendering by avoiding portions of a scene unlikely to contribute visible surfaces. The method applies to polygonal and parametrically curved surfaces.

    DOI: 10.1145/800031.808584
  2. 2

    Screen-Area Coherence for Interactive Scanline Display Algorithms

    Gary A. Crocker

    IEEE Computer Graphics and Applications, vol. 7, no. 9, pp. 10–17, September 1987.

    Recalculates only screen regions affected by geometric changes to make scan-line display more interactive for constructive-solid-geometry models. Reported tests reduced average frame-update time to roughly one quarter of a full redisplay.

    DOI: 10.1109/MCG.1987.277050
  3. 3

    Boundary Evaluation of Non-Convex Primitives to Produce Parametric Trimmed Surfaces

    Gary A. Crocker and William F. Reinke

    Computer Graphics: Proceedings of SIGGRAPH ’87, vol. 21, no. 4, pp. 129–136, July 1987.

    Describes boundary evaluation for non-convex primitives that produces parametric trimmed surfaces, supporting interaction between constructive-solid models and surface- or wireframe-oriented CAD representations.

    DOI: 10.1145/37401.37418
  4. 4

    An Editable Nonmanifold Boundary Representation

    Gary A. Crocker and William F. Reinke

    IEEE Computer Graphics and Applications, vol. 11, no. 2, pp. 39–51, 1991.

    Develops an editable nonmanifold boundary-representation scheme supporting Boolean operations, surface and wireframe information, and retained input-primitive descriptions for subsequent editing.

    DOI: 10.1109/38.75589

Additional technical documents

  1. Boundary Evaluation of Solid Models: Algorithm Study and Implementation

    Gary A. Crocker

    Master’s thesis, Rensselaer Polytechnic Institute, 1988.

    A more extensive treatment of boundary-evaluation algorithms underlying Crocker’s solid-modeling research, cited in later technical literature.

  2. Boundary Evaluation in a Non-Manifold Environment

    Gary A. Crocker and William F. Reinke

    Technical report or prepublication material, November 1989.

    A cataloged technical document of approximately 30 pages plus 16 pages of illustrations and a bibliography. Its subject overlaps the later work on editable nonmanifold boundary representations, although the catalog record does not establish that the documents are identical.