diff --git a/regression_tests/q3map2/decal_misalignment/README.txt b/regression_tests/q3map2/decal_misalignment/README.txt
new file mode 100644
index 00000000..f9aa3d6d
--- /dev/null
+++ b/regression_tests/q3map2/decal_misalignment/README.txt
@@ -0,0 +1,16 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+The info_null in the map for the decal is not 100% below the center of the
+decal itself, because to be totally below it would have to lie on half-units.
+So, the info_null lies almost directly below the center of the decal.  In
+this particular case, all kinds of bad things happen to the decal.  For one,
+during compiling we get warnings like this:
+
+  Bad texture matrix! (B) (50.512253, -49.515625) != (50.484375, -49.515625)
+  Bad texture matrix! (C) (48.723190, -49.522587) != (48.695312, -49.515625)
+  Bad texture matrix! (B) (48.723186, -49.522587) != (48.695312, -49.515625)
+
+If you look at where the decal (it's just a blue translucent tile texture)
+meets the far wall, it's clearly not aligned correctly.  The tile on the decal
+and the tile on the wall should align perfectly, and it's quite a bit off.
diff --git a/regression_tests/q3map2/decal_misalignment/maps/decal_misalignment.map b/regression_tests/q3map2/decal_misalignment/maps/decal_misalignment.map
new file mode 100644
index 00000000..aaa96b91
--- /dev/null
+++ b/regression_tests/q3map2/decal_misalignment/maps/decal_misalignment.map
@@ -0,0 +1,102 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( 6472 6336 -960 ) ( 6288 6336 -960 ) ( 6288 6320 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6264 6320 -576 ) ( 6264 6336 -576 ) ( 6448 6336 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6280 6328 -832 ) ( 6464 6328 -832 ) ( 6464 6328 -848 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6320 -832 ) ( 6464 6336 -832 ) ( 6464 6336 -848 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6336 -832 ) ( 6280 6336 -832 ) ( 6280 6336 -848 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 6336 -832 ) ( 6144 6320 -832 ) ( 6144 6320 -848 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 1
+{
+( 6552 6520 -960 ) ( 6464 6520 -960 ) ( 6464 6336 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6336 -576 ) ( 6464 6520 -576 ) ( 6552 6520 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6336 -576 ) ( 6552 6336 -576 ) ( 6552 6336 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6472 6344 -576 ) ( 6472 6528 -576 ) ( 6472 6528 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6528 7360 -576 ) ( 6440 7360 -576 ) ( 6440 7360 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6520 -576 ) ( 6464 6336 -576 ) ( 6464 6336 -960 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 2
+{
+( 6464 7424 -960 ) ( 6144 7424 -960 ) ( 6144 7360 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 7360 -576 ) ( 6144 7424 -576 ) ( 6464 7424 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 7360 -576 ) ( 6464 7360 -576 ) ( 6464 7360 -960 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+( 6464 7360 -576 ) ( 6464 7424 -576 ) ( 6464 7424 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 7368 -576 ) ( 6144 7368 -576 ) ( 6144 7368 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 7424 -576 ) ( 6144 7360 -576 ) ( 6144 7360 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( 6144 7360 -960 ) ( 5880 7360 -960 ) ( 5880 6808 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 5880 6808 -576 ) ( 5880 7360 -576 ) ( 6144 7360 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 5864 6336 -576 ) ( 6128 6336 -576 ) ( 6128 6336 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 6808 -576 ) ( 6144 7360 -576 ) ( 6144 7360 -960 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 7360 -576 ) ( 5880 7360 -576 ) ( 5880 7360 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6136 7384 -576 ) ( 6136 6832 -576 ) ( 6136 6832 -960 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 4
+{
+( 6456 7360 -968 ) ( 6136 7360 -968 ) ( 6136 6336 -968 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 6336 -960 ) ( 6144 7360 -960 ) ( 6464 7360 -960 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+( 6144 6336 -960 ) ( 6464 6336 -960 ) ( 6464 6336 -1008 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6336 -960 ) ( 6464 7360 -960 ) ( 6464 7360 -1008 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 7360 -960 ) ( 6144 7360 -960 ) ( 6144 7360 -1008 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 7360 -960 ) ( 6144 6336 -960 ) ( 6144 6336 -1008 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( 6464 7360 -576 ) ( 6152 7360 -576 ) ( 6152 6336 -576 ) radiant_regression_tests/bigtile 0 0 0 0.500000 0.500000 0 0 0
+( 6176 6336 -568 ) ( 6176 7360 -568 ) ( 6488 7360 -568 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6152 6336 -472 ) ( 6464 6336 -472 ) ( 6464 6336 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 6336 -472 ) ( 6464 7360 -472 ) ( 6464 7360 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6464 7360 -472 ) ( 6152 7360 -472 ) ( 6152 7360 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 6144 7360 -472 ) ( 6144 6336 -472 ) ( 6144 6336 -576 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( 6200 7360 -896 ) ( 6200 6336 -896 ) ( 6592 6336 -896 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+( 6360 6336 -832 ) ( 6360 7256 -832 ) ( 6464 7256 -832 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+( 6208 6337 -832 ) ( 6400 6337 -832 ) ( 6400 6337 -896 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+( 6463 6336 -816 ) ( 6463 7360 -816 ) ( 6463 7360 -880 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+( 6232 7264 -896 ) ( 6232 7264 -832 ) ( 6232 6337 -896 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+( 6232 7256 -832 ) ( 6232 7256 -896 ) ( 6463 7256 -832 ) radiant_regression_tests/glass 0 0 0 0.500000 0.500000 134217728 257 0
+}
+}
+// entity 1
+{
+"target" "checker"
+"classname" "_decal"
+// brush 0
+{
+patchDef2
+{
+radiant_regression_tests/tile_trans
+( 3 3 0 0 0 )
+(
+( ( 6462 7255 -832 50.484375 -56.679688 ) ( 6462 6796.500000 -832 50.484375 -53.097656 ) ( 6462 6338 -832 50.484375 -49.515625 ) )
+( ( 6347.500000 7255 -832 49.589844 -56.679688 ) ( 6347.500000 6796.500000 -832 49.589844 -53.097656 ) ( 6347.500000 6338 -832 49.589844 -49.515625 ) )
+( ( 6233 7255 -832 48.695312 -56.679688 ) ( 6233 6796.500000 -832 48.695312 -53.097656 ) ( 6233 6338 -832 48.695312 -49.515625 ) )
+)
+}
+}
+}
+// entity 2
+{
+"targetname" "checker"
+"origin" "6347 6796 -840"
+"classname" "info_null"
+}
+// entity 3
+{
+"origin" "6288 6704 -712"
+"classname" "info_player_deathmatch"
+}
+// entity 4
+{
+"light" "2000"
+"origin" "6304 6792 -704"
+"classname" "light"
+}
diff --git a/regression_tests/q3map2/decal_misalignment/scripts/ramb_common.shader b/regression_tests/q3map2/decal_misalignment/scripts/ramb_common.shader
new file mode 100644
index 00000000..2dce0da7
--- /dev/null
+++ b/regression_tests/q3map2/decal_misalignment/scripts/ramb_common.shader
@@ -0,0 +1,170 @@
+textures/ramb_common/caulk
+{
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nomarks
+}
+
+textures/ramb_common/hollowcaulk
+{
+    qer_editorImage textures/ramb_common/caulk.jpg
+    qer_trans 0.5
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nomarks
+    surfaceparm nonsolid
+}
+
+textures/ramb_common/nonsolidcaulk
+{
+    qer_editorImage textures/ramb_common/caulk.jpg
+    qer_trans 0.2
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nonsolid
+    surfaceparm trans
+    surfaceparm nomarks
+    surfaceparm detail
+}
+
+textures/ramb_common/softslickcaulk
+{
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nomarks
+    surfaceparm nodamage
+    surfaceparm slick
+}
+
+textures/ramb_common/softcaulk
+{
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nomarks
+    surfaceparm nodamage
+}
+
+textures/ramb_common/trigger
+{
+    qer_trans 0.5
+    qer_nocarve
+    surfaceparm nodraw
+    surfaceparm detail
+}
+
+textures/ramb_common/playerclip
+{
+    qer_trans 0.5
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nonsolid
+    surfaceparm trans
+    surfaceparm nomarks
+    surfaceparm noimpact
+    surfaceparm playerclip
+    surfaceparm slick
+    surfaceparm nodamage
+    surfaceparm detail
+}
+
+textures/ramb_common/tractionplayerclip
+{
+    qer_trans 0.5
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nonsolid
+    surfaceparm trans
+    surfaceparm nomarks
+    surfaceparm noimpact
+    surfaceparm playerclip
+    surfaceparm nodamage
+    surfaceparm detail
+}
+
+textures/ramb_common/nodrop
+{
+    qer_trans 0.3
+    qer_nocarve
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nonsolid
+    surfaceparm trans
+    surfaceparm nomarks
+    surfaceparm detail
+    surfaceparm nodrop
+}
+
+textures/ramb_common/clearfiller
+{
+    qer_trans 0.4
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm trans
+    surfaceparm nodamage
+    surfaceparm detail
+}
+
+textures/ramb_common/slickclearfiller
+{
+    qer_trans 0.4
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm trans
+    surfaceparm slick
+    surfaceparm nodamage
+    surfaceparm detail
+}
+
+textures/ramb_common/origin
+{
+    qer_nocarve
+    surfaceparm nodraw
+    surfaceparm nolightmap
+    surfaceparm nonsolid
+    surfaceparm trans
+    surfaceparm origin
+}
+
+textures/ramb_common/hint
+{
+    qer_nocarve
+    qer_trans 0.30
+    surfaceparm nodraw
+    surfaceparm nonsolid
+    surfaceparm structural
+    surfaceparm trans
+    surfaceparm hint
+}
+
+textures/ramb_common/alpha50
+{
+    qer_editorImage textures/ramb_common/alpha.jpg
+    qer_trans 0.4
+    q3map_alphaMod volume
+    q3map_alphaMod set 0.5
+    surfaceparm nodraw
+    surfaceparm nonsolid
+    surfaceparm trans
+}
+
+textures/ramb_common/alpha35
+{
+    qer_editorImage textures/ramb_common/alpha.jpg
+    qer_trans 0.3
+    q3map_alphaMod volume
+    q3map_alphaMod set 0.35
+    surfaceparm nodraw
+    surfaceparm nonsolid
+    surfaceparm trans
+}
+
+textures/ramb_common/alpha20
+{
+    qer_editorImage textures/ramb_common/alpha.jpg
+    qer_trans 0.2
+    q3map_alphaMod volume
+    q3map_alphaMod set 0.2
+    surfaceparm nodraw
+    surfaceparm nonsolid
+    surfaceparm trans
+}
diff --git a/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/bigtile.tga b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/bigtile.tga
new file mode 100644
index 00000000..b4adef0d
Binary files /dev/null and b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/bigtile.tga differ
diff --git a/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/glass.tga b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/glass.tga
new file mode 100644
index 00000000..506baedb
Binary files /dev/null and b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/glass.tga differ
diff --git a/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/qer_glass.tga b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/qer_glass.tga
new file mode 100644
index 00000000..d5683e3d
Binary files /dev/null and b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/qer_glass.tga differ
diff --git a/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/tile_trans.tga b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/tile_trans.tga
new file mode 100644
index 00000000..a9410ca0
Binary files /dev/null and b/regression_tests/q3map2/decal_misalignment/textures/radiant_regression_tests/tile_trans.tga differ