It was discovered that BaseWindingForPlane() in polylib.c did some sloppy
mathematics with significant loss of precision. Those problems have been
-addressed in commit revision 371.
+addressed in commits to revisions 371 and 377.
POSSIBLE SIDE EFFECTS:
As you can see, all points but one have an increase in accuracy. This is
still not accurate enough in my opinion, but is a step in the right direction.
+After the fix committed in revision 377, which is a further attempt to address
+BaseWindingForPlane(), we get the following accuracy:
+
+ (6784.00000000 16241.00000000 -1722.00000000)
+ (6144.00000000 16083.00000000 -1443.00000000)
+ (6144.00000000 16122.00000000 -1424.00000000)
+
+It's just a fluke for this particular case, but obviouly revision 377 looks
+favorably upon this regression test, because there is zero percent error.
+
MORE NOTES:
===========
I attempted to improve upon revision 371 by streamlining the code in
-BaseWindingForPlane() some more. Those attempts were committed as r375.
-After revision 375:
+BaseWindingForPlane() some more. Those attempts were committed as revision
+375. After revision 375:
(6784.09375000 16241.01757812 -1722.04687500)
(6144.00000000 16082.99414062 -1443.00390625)
(6144.00000000 16122.00000000 -1424.00097656)
Revision 375 has since been reverted (undone) because of the loss in
-accuracy.
+accuracy. Revision 377 is a fix for those failed attempts.