we activate the parent pointer and increment the child index of the collapsed node.
Deactivating the parent pointer and decrementing the child index reverses the col-
lapse operation. The algorithm maintains a set of
display strips,
which represent the
current simplification of the full-resolution triangle strips. Whenever a fold or unfold
affects a triangle strip, the corresponding display strips are regenerated by walking the
original triangle strip and following parent pointers at each vertex to find the corre-
sponding vertex in the simplified mesh. Figure 5.13 illustrates
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