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James Gregory 2013-12-30 20:26:41 +11:00
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[Previous](59-02.html) [Table of Contents](index.html) [Next](59-04.html)
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Creating a BSP tree is a recursive process, so we'll perform the first
split and go from there. Figure 59.3 shows the world carved along the
line of wall C into two parts: walls that are in front of wall C, and
@ -131,11 +127,3 @@ of the left and right vertices indicates which way the wall is facing.
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![](images/i.jpg) *Be aware that BSP trees can often be made smaller and more efficient by detecting collinear surfaces (like aligned wall segments) and generating only one BSP node for each collinear set, with the collinear surfaces stored in, say, a linked list attached to that node. Collinear surfaces partition space identically and can't occlude one another, so it suffices to generate one splitting node for each collinear set.*
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash