Importing regression tests for q3map2 from Rambetter-math-fix-experiments into

trunk.  Branch Rambetter-math-fix-experiments can be deleted now.


git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@417 8a3a26a2-13c4-0310-b231-cf6edde360e5

regression_tests/q3map2/coarse_snap_normal/README.txt

@@ -0,0 +1,16 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+Because of the coarse nature of SnapNormal(), planes that are 0.25 degrees
+away from being axial are "snapped" to be axial.  The "normal epsilon"
+is a very small value by default, and cannot go much smaller (without
+running into limits of floating point numbers).  The problem with
+SnapNormal() is that we compare the components of the normal that are near
+1, instead of comaring the components that are near 0.  This leads to a very
+coarse and inaccurate SnapNormal().
+
+If you open the example map in Radiant, you can see that the red brick should
+touch the middle checkered brick at the edge.  However, once this map is
+compiled, the edges are a significant distance apart.  This is due to the
+coarse and inaccurate nature of SnapNormal().  Likewise, the green brick should
+be flush with the center tiled brick, but it's not.

regression_tests/q3map2/coarse_snap_normal/maps/coarse_snap_normal.map

@@ -0,0 +1,96 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( 544 312 -8 ) ( -584 312 -8 ) ( -584 -488 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -576 -488 0 ) ( -576 312 0 ) ( 552 312 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -584 -512 8 ) ( 544 -512 8 ) ( 544 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -488 8 ) ( 512 312 8 ) ( 512 312 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 528 512 8 ) ( -600 512 8 ) ( -600 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 312 8 ) ( -512 -488 8 ) ( -512 -488 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 1
+{
+( 720 512 0 ) ( 512 512 0 ) ( 512 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 512 ) ( 512 512 512 ) ( 720 512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 512 ) ( 720 -512 512 ) ( 720 -512 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 520 -512 520 ) ( 520 512 520 ) ( 520 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 720 512 512 ) ( 512 512 512 ) ( 512 512 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 512 512 ) ( 512 -512 512 ) ( 512 -512 -8 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 2
+{
+( -512 512 0 ) ( -592 512 0 ) ( -592 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -592 -512 512 ) ( -592 512 512 ) ( -512 512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -592 -512 512 ) ( -512 -512 512 ) ( -512 -512 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -512 512 ) ( -512 512 512 ) ( -512 512 -8 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -512 512 512 ) ( -592 512 512 ) ( -592 512 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -520 512 536 ) ( -520 -512 536 ) ( -520 -512 16 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( 512 512 512 ) ( -512 512 512 ) ( -512 -512 512 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -488 -512 520 ) ( -488 512 520 ) ( 536 512 520 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -512 664 ) ( 512 -512 664 ) ( 512 -512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 664 ) ( 512 512 664 ) ( 512 512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 512 664 ) ( -512 512 664 ) ( -512 512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 512 664 ) ( -512 -512 664 ) ( -512 -512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 4
+{
+( 512 608 0 ) ( -512 608 0 ) ( -512 520 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 520 512 ) ( -512 608 512 ) ( 512 608 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 512 512 ) ( 512 512 512 ) ( 512 512 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 512 520 512 ) ( 512 608 512 ) ( 512 608 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 520 520 ) ( -512 520 520 ) ( -512 520 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 608 512 ) ( -512 520 512 ) ( -512 520 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( 512 -512 0 ) ( -512 -512 0 ) ( -512 -600 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -600 512 ) ( -512 -512 512 ) ( 512 -512 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -520 520 ) ( 512 -520 520 ) ( 512 -520 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -600 512 ) ( 512 -512 512 ) ( 512 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 512 ) ( -512 -512 512 ) ( -512 -512 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -512 -512 512 ) ( -512 -600 512 ) ( -512 -600 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( 512 72 64 ) ( -512 72 64 ) ( -512 -448 64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -128 448 260 ) ( 192 448 260 ) ( 192 -448 256 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -512 -448 256 ) ( 512 -448 256 ) ( 512 -448 56 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 192 -440 256 ) ( 192 80 256 ) ( 192 80 56 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 192 448 260 ) ( -128 448 260 ) ( -128 448 64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -128 56 256 ) ( -128 -464 256 ) ( -128 -464 56 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 7
+{
+( 192 -448 232 ) ( -128 -448 232 ) ( -128 -472 232 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -128 -472 256 ) ( -128 -448 256 ) ( 192 -448 256 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -128 -472 256 ) ( 192 -472 256 ) ( 192 -472 232 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( 192 -472 256 ) ( 192 -448 256 ) ( 192 -448 232 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( 192 -448 256 ) ( -128 -448 256 ) ( -128 -448 232 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -128 -448 256 ) ( -128 -472 256 ) ( -128 -472 232 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 8
+{
+( 192 472 260 ) ( -128 472 260 ) ( -128 448 260 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -128 448 280 ) ( -128 472 280 ) ( 192 472 280 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -128 448 280 ) ( 192 448 280 ) ( 192 448 256 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( 192 448 280 ) ( 192 472 280 ) ( 192 472 256 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( 192 472 280 ) ( -128 472 280 ) ( -128 472 256 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -128 472 280 ) ( -128 448 280 ) ( -128 448 256 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+}
+}
+// entity 1
+{
+"light" "3000"
+"origin" "0 0 384"
+"classname" "light"
+}
+// entity 2
+{
+"origin" "0 -64 384"
+"classname" "info_player_deathmatch"
+}

regression_tests/q3map2/degenerate_winding/README.txt

@@ -0,0 +1,4 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+I'm testing when windings become degenerate.

regression_tests/q3map2/degenerate_winding/maps/degenerate_winding.map

@@ -0,0 +1,78 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( 256 256 -8 ) ( -256 256 -8 ) ( -256 -264 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -264 0 ) ( -256 256 0 ) ( 256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 -256 8 ) ( 256 -256 8 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -264 8 ) ( 256 256 8 ) ( 256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 8 ) ( -256 256 8 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 8 ) ( -256 -264 8 ) ( -256 -264 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 1
+{
+( 296 256 0 ) ( 256 256 0 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 280 -256 512 ) ( 280 256 512 ) ( 320 256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 392 ) ( 296 -256 392 ) ( 296 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 264 -256 384 ) ( 264 256 384 ) ( 264 256 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 296 256 392 ) ( 256 256 392 ) ( 256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 392 ) ( 256 -256 392 ) ( 256 -256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 2
+{
+( -256 256 0 ) ( -320 256 0 ) ( -320 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -320 -256 512 ) ( -320 256 512 ) ( -256 256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -320 -256 504 ) ( -256 -256 504 ) ( -256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -256 504 ) ( -256 256 504 ) ( -256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 256 504 ) ( -320 256 504 ) ( -320 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -264 256 496 ) ( -264 -256 496 ) ( -264 -256 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( 256 256 512 ) ( -256 256 512 ) ( -256 -256 512 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -224 -256 520 ) ( -224 256 520 ) ( 288 256 520 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -256 584 ) ( 256 -256 584 ) ( 256 -256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 584 ) ( 256 256 584 ) ( 256 256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 584 ) ( -256 256 584 ) ( -256 256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 584 ) ( -256 -256 584 ) ( -256 -256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 4
+{
+( 256 328 0 ) ( -256 328 0 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 512 ) ( -256 328 512 ) ( 256 328 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 512 ) ( 256 256 512 ) ( 256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 256 256 512 ) ( 256 328 512 ) ( 256 328 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 264 536 ) ( -256 264 536 ) ( -256 264 24 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 328 512 ) ( -256 256 512 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( 256 -256 0 ) ( -256 -256 0 ) ( -256 -304 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -304 512 ) ( -256 -256 512 ) ( 256 -256 512 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -264 520 ) ( 256 -264 520 ) ( 256 -264 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -304 512 ) ( 256 -256 512 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 512 ) ( -256 -256 512 ) ( -256 -256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 -256 512 ) ( -256 -304 512 ) ( -256 -304 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( 64 0 128 ) ( 8 0 128 ) ( 8 -8 128 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( 8 -8 464 ) ( 8 0 464 ) ( 64 0 464 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -240 8 464 ) ( -240 0 464 ) ( -240 0 160 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -240 24 128 ) ( 160 8 128 ) ( -240 24 464 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( 160 8 128 ) ( -240 0 128 ) ( 160 8 464 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( 159 11 128 ) ( 159 0 128 ) ( 159 11 464 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+}
+}
+// entity 1
+{
+"light" "1000"
+"origin" "-40 0 32"
+"classname" "light"
+}
+// entity 2
+{
+"origin" "-40 128 96"
+"classname" "info_player_deathmatch"
+}

regression_tests/q3map2/disappearing_sliver/winding_logging.patch

@@ -1,18 +1,17 @@
 Index: tools/quake3/q3map2/brush.c
 ===================================================================
---- tools/quake3/q3map2/brush.c	(revision 371)
+--- tools/quake3/q3map2/brush.c	(revision 391)
 +++ tools/quake3/q3map2/brush.c	(working copy)
-@@ -356,17 +356,29 @@
+@@ -421,10 +421,16 @@
- 	winding_t	*w;
  	side_t		*side;
  	plane_t		*plane;
-+
+ 	
+-	
 +	static	int	brushord = -1;
 +	brushord++;
 +
 +	Sys_Printf("In CreateBrushWindings() for brush %i\n", brushord);	
- 	
++
--	
  	/* walk the list of brush sides */
  	for( i = 0; i < brush->numsides; i++ )
  	{
@@ -21,33 +20,46 @@ Index: tools/quake3/q3map2/brush.c
  		/* get side and plane */
  		side = &brush->sides[ i ];
  		plane = &mapplanes[ side->planenum ];
- 		
+@@ -435,7 +441,13 @@
- 		/* make huge winding */
+ #else
  		w = BaseWindingForPlane( plane->normal, plane->dist );
+ #endif
+-		
 +
 +		Sys_Printf("        Before clipping we have:\n");
 +		int z;
 +		for (z = 0; z < w->numpoints; z++) {
 +			Sys_Printf("            (%.8f %.8f %.8f)\n", w->p[z][0], w->p[z][1], w->p[z][2]);
 +		}
- 		
++
  		/* walk the list of brush sides */
  		for( j = 0; j < brush->numsides && w != NULL; j++ )
-@@ -379,6 +391,11 @@
+ 		{
- 				continue;
+@@ -451,7 +463,20 @@
- 			plane = &mapplanes[ brush->sides[ j ].planenum ^ 1 ];
+ #else
  			ChopWindingInPlace( &w, plane->normal, plane->dist, 0 ); // CLIP_EPSILON );
+ #endif
+-			
 +
 +			Sys_Printf("        After clipping w/ side %i we have:\n", j);
-+			for (z = 0; z < w->numpoints; z++) {
++			if (w)
++			{
++				for (z = 0; z < w->numpoints; z++)
++				{
 +					Sys_Printf("            (%.8f %.8f %.8f)\n", w->p[z][0], w->p[z][1], w->p[z][2]);
 +				}
- 			
++			}
++			else
++			{
++				Sys_Printf("            winding is NULL\n");
++			}
++
  			/* ydnar: fix broken windings that would generate trifans */
- 			FixWinding( w );
+ #if EXPERIMENTAL_HIGH_PRECISION_MATH_Q3MAP2_FIXES
+ 			FixWindingAccu(w);
 Index: tools/quake3/q3map2/map.c
 ===================================================================
---- tools/quake3/q3map2/map.c	(revision 371)
+--- tools/quake3/q3map2/map.c	(revision 391)
 +++ tools/quake3/q3map2/map.c	(working copy)
 @@ -803,7 +803,11 @@
  	char			shader[ MAX_QPATH ];
@@ -74,7 +86,7 @@ Index: tools/quake3/q3map2/map.c
  		if( !GetToken( qtrue ) )
  			break;
  		if( !strcmp( token, "}" ) )
-@@ -917,6 +924,10 @@
+@@ -917,7 +924,16 @@
  		}
  		
  		/* find the plane number */
@@ -83,5 +95,11 @@ Index: tools/quake3/q3map2/map.c
 +		Sys_Printf("        (%f %f %f)\n", planePoints[1][0], planePoints[1][1], planePoints[1][2]);
 +		Sys_Printf("        (%f %f %f)\n", planePoints[2][0], planePoints[2][1], planePoints[2][2]);
  		planenum = MapPlaneFromPoints( planePoints );
++		Sys_Printf("        normal: (%.10f %.10f %.10f)\n",
++				mapplanes[planenum].normal[0],
++				mapplanes[planenum].normal[1],
++				mapplanes[planenum].normal[2]);
++		Sys_Printf("        dist: %.10f\n", mapplanes[planenum].dist);
  		side->planenum = planenum;
  		
+ 		/* bp: get the texture mapping for this texturedef / plane combination */

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)
+************
+

regression_tests/q3map2/duplicate_plane/README.txt

@@ -0,0 +1,13 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+The 4-sided brush in the middle of the room (brush 0) has a duplicate plane.
+The last side (side 4) is a duplicate of the third side (side 2) with the
+vertexes re-arranged.
+
+I wanted to make sure that ChopWindingInPlaceAccu() is doing the right thing
+by setting a winding to NULL when all its points lie on the plane that the
+winding is being chopped with.  This seems to be the case.  My concern was
+that both windings for that duplicate plane will be NULL'ed out.
+
+Seems that some other code might be fixing duplicate planes.  That's OK.

regression_tests/q3map2/duplicate_plane/maps/duplicate_plane.map

@@ -0,0 +1,77 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( 136 128 64 ) ( -128 128 64 ) ( -128 -192 64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 136 128 384 ) ( -128 128 384 ) ( -128 128 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 128 -192 0 ) ( -128 128 0 ) ( 128 -192 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -128 128 256 ) ( 128 128 64 ) ( -128 -192 256 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 128 -192 384 ) ( 128 -192 0 ) ( -128 128 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 1
+{
+( 256 256 -8 ) ( -256 256 -8 ) ( -256 -256 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -256 0 ) ( -256 256 0 ) ( 256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 -256 8 ) ( 256 -256 8 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 8 ) ( 256 256 8 ) ( 256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 8 ) ( -256 256 8 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 8 ) ( -256 -256 8 ) ( -256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 2
+{
+( -256 256 0 ) ( -280 256 0 ) ( -280 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -280 -256 384 ) ( -280 256 384 ) ( -256 256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -280 -256 384 ) ( -256 -256 384 ) ( -256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -256 384 ) ( -256 256 384 ) ( -256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 256 384 ) ( -280 256 384 ) ( -280 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -264 256 392 ) ( -264 -256 392 ) ( -264 -256 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( 280 256 0 ) ( 256 256 0 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 384 ) ( 256 256 384 ) ( 280 256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 384 ) ( 280 -256 384 ) ( 280 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 264 -256 384 ) ( 264 256 384 ) ( 264 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 280 256 384 ) ( 256 256 384 ) ( 256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 384 ) ( 256 -256 384 ) ( 256 -256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 4
+{
+( 256 256 384 ) ( -256 256 384 ) ( -256 -256 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -248 -256 392 ) ( -248 256 392 ) ( 264 256 392 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -256 424 ) ( 256 -256 424 ) ( 256 -256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 424 ) ( 256 256 424 ) ( 256 256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 256 424 ) ( -256 256 424 ) ( -256 256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 424 ) ( -256 -256 424 ) ( -256 -256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( 256 296 0 ) ( -256 296 0 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 384 ) ( -256 296 384 ) ( 256 296 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 256 384 ) ( 256 256 384 ) ( 256 256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 256 256 384 ) ( 256 296 384 ) ( 256 296 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 264 392 ) ( -256 264 392 ) ( -256 264 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 296 384 ) ( -256 256 384 ) ( -256 256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( 256 -256 0 ) ( -256 -256 0 ) ( -256 -296 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -296 384 ) ( -256 -256 384 ) ( 256 -256 384 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -256 -264 392 ) ( 256 -264 392 ) ( 256 -264 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -296 384 ) ( 256 -256 384 ) ( 256 -256 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 256 -256 384 ) ( -256 -256 384 ) ( -256 -256 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 -256 384 ) ( -256 -296 384 ) ( -256 -296 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+// entity 1
+{
+"origin" "-8 16 256"
+"classname" "info_player_deathmatch"
+}
+// entity 2
+{
+"light" "1000"
+"origin" "-32 -40 256"
+"classname" "light"
+}

regression_tests/q3map2/plane_aliasing/README.txt

@@ -0,0 +1,129 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+This example map demonstrates what a relatively large value for plane distance
+epsilon can do as far as destroying draw surfaces.  The plane distance
+epsilon was 0.01 at the time of this writing.  This means that two planes
+with the same normal and a distance 0.00999 apart are considered to be the
+same plane.
+
+The recommended value of plane distance epsilon is more along the lines of
+0.001; however, we can't currently change this epsilon to that value due to
+lack of resolution in 32 bit floating point integers in the 2^16 number range.
+The smallest epsilon in 32 bit float land that can be added to 2^16 that
+results in a value greater than 2^16 is approximately 0.007, which is already
+practically the current default plane distance epsilon (0.01).
+
+Brush 0 in the example map is a 6-sided brush with red top face.  The red top
+face is defined such in the .map file:
+
+  ( -127 256 513 ) ( -127 384 513 ) ( 1 384 512 )
+
+During the -bsp stage,
+
+  In ParseRawBrush() for brush 0
+      Side 4:
+          (-127.000000 256.000000 513.000000)
+          (-127.000000 384.000000 513.000000)
+          (1.000000 384.000000 512.000000)
+          normal: (0.0078122616 0.0000000000 0.9999694824)
+          dist: 511.9921875000
+
+Now brush 1, the 4-sided brush with the red top face, has the following
+defined as the red top face:
+
+  ( -128 0 513 ) ( -128 128 513 ) ( 0 128 512 )
+
+It's almost the same plane, only off by a distance of about 0.01.
+
+During compiling:
+
+  In ParseRawBrush() for brush 1
+      Side 1:
+          (-128.000000 0.000000 513.000000)
+          (-128.000000 128.000000 513.000000)
+          (0.000000 128.000000 512.000000)
+          normal: (0.0078122616 0.0000000000 0.9999694824)
+          dist: 511.9921875000
+
+Note that the normal and dist are identical to the plane above, even though
+the two are different.  This leads to multiplying errors later on, when this
+side is intersected with the bottom green face.  In particular, the blue face
+disappears from the map.  The blue face:
+
+  In CreateBrushWindings() for brush 1
+      Handling side 2 on the brush
+          Before clipping we have:
+              (-262144.00000000 0.00000000 262144.00000000)
+              (262144.00000000 0.00000000 262144.00000000)
+              (262144.00000000 -0.00000000 -262144.00000000)
+              (-262144.00000000 0.00000000 -262144.00000000)
+          After clipping w/ side 0 we have:
+              (-262144.00000000 0.00000000 262144.00000000)
+              (262144.00000000 0.00000000 262144.00000000)
+              (262144.00000000 0.00000000 -19977.00073172)
+              (-262144.00000000 0.00000000 20983.00073758)
+          After clipping w/ side 1 we have:
+              (262144.00000000 0.00000000 -1535.99218726)
+              (262144.00000000 0.00000000 -19977.00073172)
+              (-128.11106773 0.00000000 513.00868046)
+          After clipping w/ side 3 we have:
+              (0.00000000 0.00000000 503.00000293)
+              (-128.11106773 0.00000000 513.00868046)
+              (-0.00000000 0.00000000 512.00781274)
+
+We see the error is greater than 0.1 in the X value -128.11106773.  This
+causes the draw surface to be discarded in processing later on.  We must
+not allow such a great error.  An error greater than or equal to 0.1 is
+considered to be very bad.
+
+This disappearing blue triangle can be fixed simply by deleting brush 0,
+the 6-sided brush that causes the bad plane alias.  I would suggest deleting
+this brush by editing the .map file manually (and then renumbering the brushes
+manually).
+
+After deleting this brush:
+
+  In ParseRawBrush() for brush 0
+      Side 1:
+          (-128.000000 0.000000 513.000000)
+          (-128.000000 128.000000 513.000000)
+          (0.000000 128.000000 512.000000)
+          normal: (0.0078122616 0.0000000000 0.9999694824)
+          dist: 511.9843750000
+
+  In CreateBrushWindings() for brush 0
+      Handling side 1 on the brush
+          Before clipping we have:
+              (262132.00000000 262136.00000000 -1535.90625143)
+              (262132.00000000 -262136.00000000 -1535.90625143)
+              (-262124.00048828 -262136.00000000 2559.84375238)
+              (-262124.00048828 262136.00000000 2559.84375238)
+          After clipping w/ side 0 we have:
+              (262132.00000000 262136.00000000 -1535.90625143)
+              (262132.00000000 -262136.00000000 -1535.90625143)
+              (-127.99993289 -262136.00000000 512.99999805)
+              (-127.99993289 262136.00000000 512.99999805)
+          After clipping w/ side 2 we have:
+              (262132.00000000 262136.00000000 -1535.90625143)
+              (262132.00000000 -0.00000000 -1535.90625143)
+              (-127.99993289 -0.00000000 512.99999805)
+              (-127.99993289 262136.00000000 512.99999805)
+          After clipping w/ side 3 we have:
+              (0.00000000 0.00000000 511.99999857)
+              (-127.99993289 -0.00000000 512.99999805)
+              (-127.99993289 127.99993289 512.99999805)
+
+Note that we're way more accurate now, and we're nowhere near to approaching
+the 0.1 error.  All it took was the deletion of a seemintly unrelated brush.
+
+
+SOLUTION TO PROBLEM:
+====================
+
+The suggested fix is to increase the resolution of plane distance from 32 bit
+float to 64 bit float for the relevant brush processing operations.  After that
+is done, decrease the default plane distance epsilon from 0.01 to 0.001.  Note
+that even though plane distance epsilon can be specified on the command-line,
+it will do no good (even if set to 0) if the plane distance is close to
+2^16.

regression_tests/q3map2/plane_aliasing/maps/plane_aliasing.map

@@ -0,0 +1,85 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( -127 384 513 ) ( -127 256 513 ) ( -127 256 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 1 384 512 ) ( -127 384 512 ) ( -127 384 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 1 256 512 ) ( 1 384 512 ) ( 1 384 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -127 256 512 ) ( 1 256 512 ) ( 1 256 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -127 256 513 ) ( -127 384 513 ) ( 1 384 512 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( 1 384 384 ) ( -127 384 384 ) ( -127 256 384 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 1
+{
+( 0 128 503 ) ( -128 128 513 ) ( 0 0 503 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -128 0 513 ) ( -128 128 513 ) ( 0 128 512 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+( -128 0 512 ) ( 0 0 512 ) ( 0 0 384 ) radiant_regression_tests/blue 0 0 0 0.500000 0.500000 0 0 0
+( -128 128 503 ) ( 0 0 503 ) ( -128 128 513 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 2
+{
+( -128 472 8 ) ( -128 320 8 ) ( -128 320 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -232 512 8 ) ( -416 512 8 ) ( -416 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -304 8 ) ( 512 -152 8 ) ( 512 -152 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 48 -512 8 ) ( 232 -512 8 ) ( 232 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -432 232 0 ) ( -432 384 0 ) ( -248 384 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -256 384 -8 ) ( -440 384 -8 ) ( -440 232 -8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( -136 512 1040 ) ( -136 -512 1040 ) ( -136 -512 8 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 512 1032 ) ( -520 512 1032 ) ( -520 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -128 -512 1032 ) ( -128 512 1032 ) ( -128 512 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -520 -512 1032 ) ( -512 -512 1032 ) ( -512 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -520 -512 1024 ) ( -520 512 1024 ) ( -512 512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 512 0 ) ( -520 512 0 ) ( -520 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 4
+{
+( 512 512 1024 ) ( 512 -512 1024 ) ( 512 -512 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 592 512 1024 ) ( 512 512 1024 ) ( 512 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 520 -512 1000 ) ( 520 512 1000 ) ( 520 512 -24 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 1024 ) ( 592 -512 1024 ) ( 592 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 1024 ) ( 512 512 1024 ) ( 592 512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 592 512 0 ) ( 512 512 0 ) ( 512 -512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( -128 512 1200 ) ( -128 -512 1200 ) ( -128 -512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 512 1200 ) ( -512 512 1200 ) ( -512 512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 1200 ) ( 512 512 1200 ) ( 512 512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -512 1200 ) ( 512 -512 1200 ) ( 512 -512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -456 -512 1032 ) ( -456 512 1032 ) ( 568 512 1032 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 512 1024 ) ( -512 512 1024 ) ( -512 -512 1024 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 6
+{
+( -128 712 1024 ) ( -128 512 1024 ) ( -128 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 520 1040 ) ( -512 520 1040 ) ( -512 520 16 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 512 1024 ) ( 512 712 1024 ) ( 512 712 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 512 1024 ) ( 512 512 1024 ) ( 512 512 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -512 512 1024 ) ( -512 712 1024 ) ( 512 712 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 712 0 ) ( -512 712 0 ) ( -512 512 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 7
+{
+( -128 -512 1024 ) ( -128 -624 1024 ) ( -128 -624 56 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -512 1024 ) ( -512 -512 1024 ) ( -512 -512 56 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 512 -624 1024 ) ( 512 -512 1024 ) ( 512 -512 56 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -520 1048 ) ( 512 -520 1048 ) ( 512 -520 80 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -512 -624 1024 ) ( -512 -512 1024 ) ( 512 -512 1024 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 512 -504 0 ) ( -512 -504 0 ) ( -512 -616 0 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+// entity 1
+{
+"classname" "light"
+"origin" "192 64 640"
+"light" "3000"
+}
+// entity 2
+{
+"classname" "info_player_deathmatch"
+"origin" "-64 64 640"
+}

regression_tests/q3map2/segmentation_fault/README.txt

@@ -0,0 +1,27 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+The example map, maps/segmentation_fault.map, contains an example of this
+bug.  q3map2 might segfault while compiling this map.  This sort of thing
+might happen in certain intermediate versions of q3map2 while work is being
+done on fixing the math accuracy.  The bug may not have happened in older
+version of q3map2, before the math accuracy issues were addressed.
+
+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.
+
+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" :-)
+
+Side 6 is actually a superfluous plane and will be NULL'ed out in the code.
+If the code does not handle a NULL'ed out winding correctly, it will
+segfault.

regression_tests/q3map2/segmentation_fault/maps/segmentation_fault.map

@@ -0,0 +1,79 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( 10296 17600 -592 ) ( 10240 17600 -592 ) ( 10240 17472 -592 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
+( 10280 17472 -576 ) ( 10280 17600 -576 ) ( 10336 17600 -576 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
+( 10280 17472 -576 ) ( 10336 17472 -576 ) ( 10336 17472 -1600 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
+( 10367 17472 -576 ) ( 10367 17600 -576 ) ( 10367 17600 -1600 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 134217728 257 0
+( 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
+}
+// brush 1
+{
+( 10504 17800 -768 ) ( 10112 17800 -768 ) ( 10112 17792 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17792 -320 ) ( 10112 17800 -320 ) ( 10504 17800 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17792 -576 ) ( 10504 17792 -576 ) ( 10504 17792 -592 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 10496 17792 -576 ) ( 10496 17800 -576 ) ( 10496 17800 -592 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10504 17800 -576 ) ( 10112 17800 -576 ) ( 10112 17800 -592 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17800 -576 ) ( 10112 17792 -576 ) ( 10112 17792 -592 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 2
+{
+( 10496 17408 -768 ) ( 10112 17408 -768 ) ( 10112 17392 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17384 -320 ) ( 10112 17400 -320 ) ( 10496 17400 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17400 -544 ) ( 10496 17400 -544 ) ( 10496 17400 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17392 -544 ) ( 10496 17408 -544 ) ( 10496 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17408 -544 ) ( 10112 17408 -544 ) ( 10112 17408 -768 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 10112 17408 -544 ) ( 10112 17392 -544 ) ( 10112 17392 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( 10568 17784 -768 ) ( 10496 17784 -768 ) ( 10496 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17408 -320 ) ( 10496 17784 -320 ) ( 10568 17784 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17408 -320 ) ( 10568 17408 -320 ) ( 10568 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10504 17400 -320 ) ( 10504 17776 -320 ) ( 10504 17776 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10568 17792 -320 ) ( 10496 17792 -320 ) ( 10496 17792 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17784 -320 ) ( 10496 17408 -320 ) ( 10496 17408 -768 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 4
+{
+( 10112 17792 -768 ) ( 10072 17792 -768 ) ( 10072 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10072 17408 -320 ) ( 10072 17792 -320 ) ( 10112 17792 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10072 17408 -320 ) ( 10112 17408 -320 ) ( 10112 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17408 -320 ) ( 10112 17792 -320 ) ( 10112 17792 -768 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 10112 17792 -320 ) ( 10072 17792 -320 ) ( 10072 17792 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10104 17792 -320 ) ( 10104 17408 -320 ) ( 10104 17408 -768 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( 10496 17792 -320 ) ( 10112 17792 -320 ) ( 10112 17408 -320 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 10112 17408 -312 ) ( 10112 17792 -312 ) ( 10496 17792 -312 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17408 -232 ) ( 10496 17408 -232 ) ( 10496 17408 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17408 -232 ) ( 10496 17792 -232 ) ( 10496 17792 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17792 -232 ) ( 10112 17792 -232 ) ( 10112 17792 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17792 -232 ) ( 10112 17408 -232 ) ( 10112 17408 -320 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( 10496 17792 -776 ) ( 10112 17792 -776 ) ( 10112 17408 -776 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17408 -768 ) ( 10112 17792 -768 ) ( 10496 17792 -768 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( 10112 17408 -768 ) ( 10496 17408 -768 ) ( 10496 17408 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17408 -768 ) ( 10496 17792 -768 ) ( 10496 17792 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10496 17792 -768 ) ( 10112 17792 -768 ) ( 10112 17792 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( 10112 17792 -768 ) ( 10112 17408 -768 ) ( 10112 17408 -856 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+// entity 1
+{
+"origin" "10312 17600 -480"
+"classname" "info_player_deathmatch"
+}
+// entity 2
+{
+"light" "1000"
+"origin" "10240 17608 -464"
+"classname" "light"
+}

regression_tests/q3map2/snap_plane/README.txt

@@ -0,0 +1,45 @@
+DESCRIPTION OF PROBLEM:
+=======================
+
+The example map, maps/snap_plane.map, contains an example of some bugs.
+The green brush with the red face is transformed into something totally
+unexpected.
+
+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:
+====================
+
+I actually came up with this regression test after reading the code to
+SnapPlane() and SnapNormal().  I decided to make this map as a test of
+whether or not I understand how the code is broken.  Sure enough, the map
+is broken in the same way that I would expect it to be broken.
+
+The problem is that the red face of the green brush in the center of the room
+is very close to being axially aligned, but not quite.  This plane will
+therefore be "snapped" to become axial.  This is not the problem.  The
+problem is that after the snap, the plane will be shifted a great deal,
+and the corner of the green brush will no longer come even close to meeting
+the corner of the other cube brush next to it (the two corners of the two
+brushes will drift apart a great deal).
+
+If you study the legacy SnapPlane() code, you will see that planes are
+defined as a unit normal and distance from origin.  Well, because
+of the position of this brush on the side of the world extents (far from
+the original), the snap will cause drastic effects on the points that the
+plane was supposed to approximate.
+
+Another problem with SnapPlane() is that SnapNormal() snaps too liberally.
+Once SnapNormal() is changed to only snap normals that are REALLY close
+to axial (and not anything within 0.25 degrees), this bug will no longer
+appear, but the SnapPlane() problem will still be present.  So, this
+regression test should be fixed BEFORE SnapNormal() is fixed, otherwise
+create another regression test with a red face that is much much closer to
+being axially aligned.  We want to make sure that SnapPlane() is fixed when
+things actually do get snapped.
+
+The code to address these issues is currently being worked on.

regression_tests/q3map2/snap_plane/maps/snap_plane.map

@@ -0,0 +1,89 @@
+// entity 0
+{
+"classname" "worldspawn"
+// brush 0
+{
+( -54784 5760 -64 ) ( -54976 5760 -64 ) ( -54976 5632 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54976 5632 0 ) ( -54976 5760 0 ) ( -54784 5760 0 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54976 5632 0 ) ( -54784 5632 0 ) ( -54784 5632 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54784 5632 0 ) ( -54784 5760 0 ) ( -54784 5760 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54784 5760 0 ) ( -54976 5760 0 ) ( -54976 5760 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54976 5760 0 ) ( -54976 5632 0 ) ( -54976 5632 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 1
+{
+( -53808 5616 -64 ) ( -55064 5616 -64 ) ( -55064 4944 -64 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -55072 4944 0 ) ( -55072 5616 0 ) ( -53816 5616 0 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -55040 4096 8 ) ( -53784 4096 8 ) ( -53784 4096 0 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -54272 4936 8 ) ( -54272 5608 8 ) ( -54272 5608 0 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -53816 5632 8 ) ( -55072 5632 8 ) ( -55072 5632 0 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -54784 5592 8 ) ( -54784 4920 8 ) ( -54784 4920 0 ) radiant_regression_tests/green 0 0 0 0.500000 0.500000 0 0 0
+( -54528 5632 -64 ) ( -54272 5631 -64 ) ( -54528 5632 0 ) radiant_regression_tests/red 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 2
+{
+( -54200 5904 -128 ) ( -55032 5904 -128 ) ( -55032 5824 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55024 5824 192 ) ( -55024 5904 192 ) ( -54192 5904 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 5824 0 ) ( -54208 5824 0 ) ( -54208 5824 -64 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -54208 5824 0 ) ( -54208 5904 0 ) ( -54208 5904 -64 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54200 5832 0 ) ( -55032 5832 0 ) ( -55032 5832 -64 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 5904 0 ) ( -55040 5824 0 ) ( -55040 5824 -64 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 3
+{
+( -54144 5824 -128 ) ( -54208 5824 -128 ) ( -54208 5424 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 5424 192 ) ( -54208 5824 192 ) ( -54144 5824 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54160 4032 192 ) ( -54096 4032 192 ) ( -54096 4032 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54200 5424 192 ) ( -54200 5824 192 ) ( -54200 5824 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54144 5824 192 ) ( -54208 5824 192 ) ( -54208 5824 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 5824 192 ) ( -54208 5424 192 ) ( -54208 5424 -128 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+}
+// brush 4
+{
+( -54208 4032 -128 ) ( -54760 4032 -128 ) ( -54760 3944 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54760 3944 192 ) ( -54760 4032 192 ) ( -54208 4032 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54752 4024 192 ) ( -54200 4024 192 ) ( -54200 4024 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 3944 192 ) ( -54208 4032 192 ) ( -54208 4032 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 4032 192 ) ( -54760 4032 192 ) ( -54760 4032 -128 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -55040 4016 192 ) ( -55040 3928 192 ) ( -55040 3928 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 5
+{
+( -55040 5824 -128 ) ( -55256 5824 -128 ) ( -55256 5256 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55256 5256 192 ) ( -55256 5824 192 ) ( -55040 5824 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55256 4032 192 ) ( -55040 4032 192 ) ( -55040 4032 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 5256 192 ) ( -55040 5824 192 ) ( -55040 5824 -128 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -55040 5824 192 ) ( -55256 5824 192 ) ( -55256 5824 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55048 5808 192 ) ( -55048 5240 192 ) ( -55048 5240 -128 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 6
+{
+( -54208 4032 192 ) ( -55040 4032 192 ) ( -55040 4024 192 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -55016 4024 200 ) ( -55016 4032 200 ) ( -54184 4032 200 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 4032 296 ) ( -54208 4032 296 ) ( -54208 4032 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 4024 296 ) ( -54208 4032 296 ) ( -54208 4032 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54200 5824 296 ) ( -55032 5824 296 ) ( -55032 5824 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 4032 296 ) ( -55040 4024 296 ) ( -55040 4024 192 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+// brush 7
+{
+( -54192 4560 -136 ) ( -55024 4560 -136 ) ( -55024 4552 -136 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 4024 -128 ) ( -55040 4032 -128 ) ( -54208 4032 -128 ) radiant_regression_tests/tile 0 0 0 0.500000 0.500000 0 0 0
+( -55040 4032 -128 ) ( -54208 4032 -128 ) ( -54208 4032 -256 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 4024 -128 ) ( -54208 4032 -128 ) ( -54208 4032 -256 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -54208 5824 -120 ) ( -55040 5824 -120 ) ( -55040 5824 -248 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+( -55040 4032 -128 ) ( -55040 4024 -128 ) ( -55040 4024 -256 ) common/caulk 0 0 0 0.500000 0.500000 0 4 0
+}
+}
+// entity 1
+{
+"light" "1000"
+"origin" "-54664 5696 40"
+"classname" "light"
+}
+// entity 2
+{
+"angle" "360"
+"origin" "-54840 5696 88"
+"classname" "info_player_deathmatch"
+}