--- /dev/null
+DESCRIPTION OF PROBLEM:
+=======================
+
+The example map, maps/disappearing_sliver2.map, contains an example of this
+bug. The triangle sliver surface in the middle of the room is not rendered
+in the final BSP.
+
+To trigger the bug, compile the map; you don't need -vis or -light. Only
+-bsp (the first q3map2 stage) is necessary to trigger the bug. The only
+entities in the map are a light and a info_player_deathmatch, so the map will
+compile for any Q3 mod.
+
+
+SOLUTION TO PROBLEM:
+====================
+
+None yet. The problem is likely caused by sloppy math operations (significant
+loss of precision).
--- /dev/null
+{
+"message" "Icy Fantasy by Rambetter"
+"classname" "worldspawn"
+{
+( 6784 16241 -1722 ) ( 6144 16083 -1443 ) ( 6144 16122 -1424 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 0 0
+( 6784 16241 -1722 ) ( 6784 16241 -2048 ) ( 6144 16083 -1443 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 16083 -1443 ) ( 6144 16083 -2048 ) ( 6144 16122 -1424 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 16122 -1424 ) ( 6144 16122 -2048 ) ( 6784 16241 -1722 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 16122 -2048 ) ( 6144 16083 -2048 ) ( 6784 16241 -2048 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+}
+{
+( 6136 16424 168 ) ( 6136 15928 168 ) ( 6136 15928 -3544 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6112 16896 160 ) ( 6000 16896 160 ) ( 6000 16896 -3552 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 160 ) ( 6144 16432 160 ) ( 6144 16432 -3552 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6032 15936 160 ) ( 6144 15936 160 ) ( 6144 15936 -3552 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6128 15936 -896 ) ( 6128 16432 -896 ) ( 6240 16432 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6160 16432 -2048 ) ( 6048 16432 -2048 ) ( 6048 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6784 16672 -1296 ) ( 6784 16176 -1296 ) ( 6784 16176 -1776 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 16896 -1312 ) ( 6136 16896 -1312 ) ( 6136 16896 -1792 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6792 16160 -1296 ) ( 6792 16656 -1296 ) ( 6792 16656 -1776 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 15936 -1280 ) ( 6144 15936 -1280 ) ( 6144 15936 -1760 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 16192 -896 ) ( 6136 16688 -896 ) ( 6144 16688 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16672 -2048 ) ( 6136 16672 -2048 ) ( 6136 16176 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6144 15936 -896 ) ( 6144 15880 -896 ) ( 6144 15880 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15936 -896 ) ( 6144 15936 -896 ) ( 6144 15936 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6784 15880 -896 ) ( 6784 15936 -896 ) ( 6784 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15928 -896 ) ( 6784 15928 -896 ) ( 6784 15928 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15880 -896 ) ( 6144 15936 -896 ) ( 6784 15936 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15936 -2048 ) ( 6144 15936 -2048 ) ( 6144 15880 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6144 16960 -896 ) ( 6144 16896 -896 ) ( 6144 16896 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16904 -896 ) ( 6144 16904 -896 ) ( 6144 16904 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -896 ) ( 6784 16960 -896 ) ( 6784 16960 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16896 -896 ) ( 6784 16896 -896 ) ( 6784 16896 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 16896 -896 ) ( 6144 16960 -896 ) ( 6784 16960 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16960 -2048 ) ( 6144 16960 -2048 ) ( 6144 16896 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6144 16896 -784 ) ( 6144 16536 -784 ) ( 6144 16536 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -784 ) ( 6144 16896 -784 ) ( 6144 16896 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16536 -784 ) ( 6784 16896 -784 ) ( 6784 16896 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 -744 ) ( 6784 15936 -744 ) ( 6784 15936 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16552 -888 ) ( 6144 16912 -888 ) ( 6784 16912 -888 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -896 ) ( 6144 16896 -896 ) ( 6144 16536 -896 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+{
+( 6144 16544 -2048 ) ( 6144 15936 -2048 ) ( 6144 15936 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -2048 ) ( 6144 16896 -2048 ) ( 6144 16896 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15936 -2048 ) ( 6784 16544 -2048 ) ( 6784 16544 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 -2048 ) ( 6784 15936 -2048 ) ( 6784 15936 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 -2048 ) ( 6144 16544 -2048 ) ( 6784 16544 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6784 16584 -2056 ) ( 6144 16584 -2056 ) ( 6144 15976 -2056 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+{
+"classname" "info_player_deathmatch"
+"origin" "6432 16168 -1472"
+"angle" "180"
+}
+{
+"classname" "light"
+"origin" "6440 16160 -1192"
+"light" "1000"
+}
--- /dev/null
+DESCRIPTION OF PROBLEM:
+=======================
+
+The example map, maps/sparkly_seam.map, contains two triangular brushes near
+the side of the room. The seam between these two brushes "sparkles" even
+though the endpoints of the edges are exactly the same.
+
+To trigger the bug, compile the map; you don't need -vis or -light. Only
+-bsp (the first q3map2 stage) is necessary to trigger the bug. The only
+entities in the map are a light and a info_player_deathmatch, so the map will
+compile for any Q3 mod.
+
+
+SOLUTION TO PROBLEM:
+====================
+
+None yet. The problem is likely caused by sloppy math operations (significant
+loss of precision).
--- /dev/null
+{
+"classname" "worldspawn"
+{
+( 6784 16015 -2048 ) ( 6144 15958 -2048 ) ( 6784 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6784 16015 -1788 ) ( 6784 16015 -2048 ) ( 6784 15936 -1792 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 15958 -1471 ) ( 6144 15958 -2048 ) ( 6784 16015 -1788 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6784 15936 -1792 ) ( 6784 15936 -2048 ) ( 6144 15958 -1471 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6784 15936 -1792 ) ( 6144 15958 -1471 ) ( 6784 16015 -1788 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 0 0
+}
+{
+( 6784 15936 -2048 ) ( 6144 15958 -2048 ) ( 6144 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6784 15936 -1792 ) ( 6144 15936 -2048 ) ( 6144 15936 -1472 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 15936 -1472 ) ( 6144 15958 -2048 ) ( 6144 15958 -1471 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 15958 -1471 ) ( 6784 15936 -2048 ) ( 6784 15936 -1792 ) common/caulk 0 0 0 0.500000 0.500000 134217728 4 0
+( 6144 15936 -1472 ) ( 6144 15958 -1471 ) ( 6784 15936 -1792 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 0 0
+}
+{
+( 6160 16432 -2048 ) ( 6048 16432 -2048 ) ( 6048 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6128 15936 -896 ) ( 6128 16432 -896 ) ( 6240 16432 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6032 15936 160 ) ( 6144 15936 160 ) ( 6144 15936 -3552 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 160 ) ( 6144 16432 160 ) ( 6144 16432 -3552 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6112 16896 160 ) ( 6000 16896 160 ) ( 6000 16896 -3552 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 16424 168 ) ( 6136 15928 168 ) ( 6136 15928 -3544 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6144 16672 -2048 ) ( 6136 16672 -2048 ) ( 6136 16176 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 16192 -896 ) ( 6136 16688 -896 ) ( 6144 16688 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 15936 -1280 ) ( 6144 15936 -1280 ) ( 6144 15936 -1760 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6792 16160 -1296 ) ( 6792 16656 -1296 ) ( 6792 16656 -1776 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16896 -1312 ) ( 6136 16896 -1312 ) ( 6136 16896 -1792 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16672 -1296 ) ( 6784 16176 -1296 ) ( 6784 16176 -1776 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+{
+( 6784 15936 -2048 ) ( 6144 15936 -2048 ) ( 6144 15880 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15880 -896 ) ( 6144 15936 -896 ) ( 6784 15936 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15928 -896 ) ( 6784 15928 -896 ) ( 6784 15928 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15880 -896 ) ( 6784 15936 -896 ) ( 6784 15936 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15936 -896 ) ( 6144 15936 -896 ) ( 6144 15936 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 15936 -896 ) ( 6144 15880 -896 ) ( 6144 15880 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6784 16960 -2048 ) ( 6144 16960 -2048 ) ( 6144 16896 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16896 -896 ) ( 6144 16960 -896 ) ( 6784 16960 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16896 -896 ) ( 6784 16896 -896 ) ( 6784 16896 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6784 16896 -896 ) ( 6784 16960 -896 ) ( 6784 16960 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16904 -896 ) ( 6144 16904 -896 ) ( 6144 16904 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16960 -896 ) ( 6144 16896 -896 ) ( 6144 16896 -2048 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6784 16896 -896 ) ( 6144 16896 -896 ) ( 6144 16536 -896 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 16552 -888 ) ( 6144 16912 -888 ) ( 6784 16912 -888 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 -744 ) ( 6784 15936 -744 ) ( 6784 15936 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16536 -784 ) ( 6784 16896 -784 ) ( 6784 16896 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -784 ) ( 6144 16896 -784 ) ( 6144 16896 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16896 -784 ) ( 6144 16536 -784 ) ( 6144 16536 -896 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+{
+( 6784 16584 -2056 ) ( 6144 16584 -2056 ) ( 6144 15976 -2056 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 15936 -2048 ) ( 6144 16544 -2048 ) ( 6784 16544 -2048 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 15936 -2048 ) ( 6784 15936 -2048 ) ( 6784 15936 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 15936 -2048 ) ( 6784 16544 -2048 ) ( 6784 16544 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6784 16896 -2048 ) ( 6144 16896 -2048 ) ( 6144 16896 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 16544 -2048 ) ( 6144 15936 -2048 ) ( 6144 15936 -2376 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+{
+"angle" "180"
+"origin" "6608 15968 -1608"
+"classname" "info_player_deathmatch"
+}
+{
+"light" "1000"
+"origin" "6440 16160 -1192"
+"classname" "light"
+}