From 938dddb6b23b7a4153e0c03cc97f74f70007adcc Mon Sep 17 00:00:00 2001
From: rambetter <rambetter>
Date: Fri, 31 Dec 2010 00:28:39 +0000
Subject: [PATCH] In branch Rambetter-math-fix-experiments.

Simplifying segmentation_fault and adding some random notes for regression
tests.


git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/branches/Rambetter-math-fix-experiments@387 8a3a26a2-13c4-0310-b231-cf6edde360e5
---
 .../q3map2/disappearing_sliver3/NOTES.txt     | 36 +++++++++++++++++++
 .../q3map2/segmentation_fault/README.txt      | 10 ++++++
 .../maps/segmentation_fault.map               |  1 -
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 regression_tests/q3map2/disappearing_sliver3/NOTES.txt

diff --git a/regression_tests/q3map2/disappearing_sliver3/NOTES.txt b/regression_tests/q3map2/disappearing_sliver3/NOTES.txt
new file mode 100644
index 0000000..aebd534
--- /dev/null
+++ b/regression_tests/q3map2/disappearing_sliver3/NOTES.txt
@@ -0,0 +1,36 @@
+Random notes for Rambetter, don't expect to understand this:
+============================================================
+
+Brush 0 is the problem.
+
+Side 0 is the problem (under surf tri).
+Side 1 is the +y 4-face.
+Side 2 is the -x 4-face.
+Side 3 is the -y 4-face.
+side 4 is the +z tri.
+
+(6144, 16122) -> (6784, 16241)
+x "climb" of side 1 is 6784 - 6144 = 640.
+y "climb" of side 1 is 16241 - 16122 = 119.
+
+x/y "climb rate" of side 1 is 640 / 119 = 5.378151261.
+
+After clipping side 0 against side 1, we get
+************
+**** (-262144, -33762.8125) -> (262144, 63722)
+************
+The slope of that is (262144 + 262144) / (63722 + 33762.8125) = 5.378150571. 
+
+(-262144, y) -> (6784, 16241)
+So (6784 + 262144) / (16241 - y) = 640 / 119
+So y = 16241 - ((119 * (6784 + 262144)) / 640) = -33762.8
+
+(6144, 16122) -> (262144, y)
+So (262144 - 6144) / (y - 16122) = 640 / 119
+So y = 16122 + ((119 * (262144 - 6144)) / 640) = 63722
+
+After clipping side 0 against side 1 should have
+************
+**** (-262144, -33762.8) -> (262144, 63722)
+************
+
diff --git a/regression_tests/q3map2/segmentation_fault/README.txt b/regression_tests/q3map2/segmentation_fault/README.txt
index 28eb3c7..4ea1622 100644
--- a/regression_tests/q3map2/segmentation_fault/README.txt
+++ b/regression_tests/q3map2/segmentation_fault/README.txt
@@ -12,6 +12,16 @@ To trigger the bug, compile the map; you don't need -vis or -light.  Only
 entities in the map are a light and a info_player_deathmatch, so the map will
 compile for any Q3 mod.
 
+Here is a description of the problem brush (brush #0):
+
+  side 0: -z face
+  side 1: +z face
+  side 2: -y face
+  side 3: +x face
+  side 4: +y face
+  side 5: -x face
+  side 6: problem side "accidentally showed up" :-)
+
 
 SOLUTION TO PROBLEM:
 ====================
diff --git a/regression_tests/q3map2/segmentation_fault/maps/segmentation_fault.map b/regression_tests/q3map2/segmentation_fault/maps/segmentation_fault.map
index 218e6c1..6a0aeca 100644
--- a/regression_tests/q3map2/segmentation_fault/maps/segmentation_fault.map
+++ b/regression_tests/q3map2/segmentation_fault/maps/segmentation_fault.map
@@ -10,7 +10,6 @@
 ( 10328 17727 -576 ) ( 10272 17727 -576 ) ( 10272 17727 -1600 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
 ( 10240 17608 -576 ) ( 10240 17480 -576 ) ( 10240 17480 -1600 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
 ( 10240 17727 -576 ) ( 10240 17726 -621 ) ( 10335 17727 -576 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
-( 10272 17472 -592 ) ( 10240 17504 -592 ) ( 10272 17472 -576 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
 }
 // brush 1
 {