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Convert figure images to markdown

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James Gregory 2013-12-31 07:56:10 +11:00
commit 77a95ec319
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67-02.md
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@ -65,8 +65,7 @@ two spans may cross such that part of each span is visible, in which
case the spans have to be split and drawn appropriately, as shown in
Figure 67.1.
![](images/67-01.jpg)\
**Figure 67.1**  *Intersecting span sorting.*
![**Figure 67.1**  *Intersecting span sorting.*](images/67-01.jpg)
Intersecting is the slowest and most complicated type of span sorting,
because it is necessary to compare 1/z values at two points in order to
@ -105,8 +104,7 @@ falsely reporting close-but-not-abutting edges as ties, proved to be
troublesome in Quake, and the epsilon calculations and extra comparisons
slowed things down.
![](images/67-02.jpg)\
**Figure 67.2**  *Abutting span sorting.*
![**Figure 67.2**  *Abutting span sorting.*](images/67-02.jpg)
I do think that abutting 1/z span sorting could have been made reliable
enough for production use in Quake, were it not that we share edges