Plate 18 (Figure 7.1, p. 186) Screen shot of the Grand Canyon with debug view~using the Digital
Dawn Graphics Toolkit, now incorporated into the Crystal Space portal engine. Courtesy
of Alex Pfaffe.
Plate 19
(Figure 7.11, p. 202) Terrain surface tessellations for Lindstrom et al.'s system, where (a) cor-
responds to a projected geometric error threshold of one pixel and (b) corresponds to an
error threshold of four pixels [Lindstrom 96]. Copyright 9 1996 Association for Comput-
ing Machinery, Inc.
Plate 20 (Figure 7.14, p. 205) (a) ...
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