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ACM Transactions on Graphics (TOG), Volume 6 Issue 1, Jan. 1987

Weighted bicubic spline interpolation to rapidly varying data
Thomas A. Foley
Pages: 1-18
DOI: 10.1145/27625.27626
The weighted bicubic spline that is a C1 piecewise bicubic interpolant to three-dimensional gridded data is introduced. This is a generalization of the univariate weighted spline, developed by Salkauskas, in that a weighted...

Worst-case optimal hidden-surface removal
Michael McKenna
Pages: 19-28
DOI: 10.1145/27625.27627
An O(n2) hidden-surface removal algorithm is shown. This is an improvement over the previous best worst-case performance of O(n2 log n). It has been...

Polyhedral subdivision methods for free-form surfaces
Ahmad H. Nasri
Pages: 29-73
DOI: 10.1145/27625.27628
One of the central issues in computer-aided geometric design is the representation of free-form surfaces which are needed for many purposes in engineering and science. Several limitations are imposed on most available surface systems: the...

The incrementor: a graphical technique for manipulating parameters
Sanford Ressler
Pages: 74-78
DOI: 10.1145/27625.214381
Description: The incrementor is a visually compact, flexible, and consistent mechanism for modifying the variables presented to the user. A locator (i.e., mouse) with two buttons is the required input device. The names of the variables appear in...