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ACM Transactions on Graphics (TOG), Volume 6 Issue 4, Oct. 1987

Digital halftones by dot diffusion
Donald E. Knuth
Pages: 245-273
DOI: 10.1145/35039.35040
This paper describes a technique for approximating real-valued pixels by two-valued pixels. The new method, called dot diffusion, appears to avoid some deficiencies of other commonly used techniques. It requires approximately the same total...

Geometric approaches to nonplanar quadric surface intersection curves
James R. Miller
Pages: 274-307
DOI: 10.1145/35039.35041
Quadric surfaces occur frequently in the design of discrete piece parts in mechanical CAD/CAM. Solid modeling systems based on quadric surfaces must be able to represent intersection curves parametrically and in a fashion that allows the...

An enhanced treatment of hidden lines
Tomihisa Kamada, Satoru Kawai
Pages: 308-323
DOI: 10.1145/35039.35042
A new display scheme is presented in which three-dimensional objects are represented with a much higher degree of user control of the line-drawing format than those in conventional schemes. In this scheme, the attribute of a line is determined...