diff --git a/src/nodebuild.cpp b/src/nodebuild.cpp
index 5ac860be..a4b56868 100644
--- a/src/nodebuild.cpp
+++ b/src/nodebuild.cpp
@@ -243,12 +243,16 @@ void FNodeBuilder::CreateSubsectorsForReal ()
 		D(Printf (PRINT_LOG, "Output subsector %d:\n", Subsectors.Size()));
 		for (unsigned int i = firstline; i < SegList.Size(); ++i)
 		{
-			D(Printf (PRINT_LOG, "  Seg %5d%c(%5d,%5d)-(%5d,%5d)\n", SegList[i].SegPtr - &Segs[0],
+			D(Printf (PRINT_LOG, "  Seg %5d%c%d(%5d,%5d)-%d(%5d,%5d)  [%08x,%08x]-[%08x,%08x]\n", SegList[i].SegPtr - &Segs[0],
 				SegList[i].SegPtr->linedef == -1 ? '+' : ' ',
+				SegList[i].SegPtr->v1,
 				Vertices[SegList[i].SegPtr->v1].x>>16,
 				Vertices[SegList[i].SegPtr->v1].y>>16,
+				SegList[i].SegPtr->v2,
 				Vertices[SegList[i].SegPtr->v2].x>>16,
-				Vertices[SegList[i].SegPtr->v2].y>>16));
+				Vertices[SegList[i].SegPtr->v2].y>>16,
+				Vertices[SegList[i].SegPtr->v1].x, Vertices[SegList[i].SegPtr->v1].y,
+				Vertices[SegList[i].SegPtr->v2].x, Vertices[SegList[i].SegPtr->v2].y));
 			SegList[i].SegNum = DWORD(SegList[i].SegPtr - &Segs[0]);
 		}
 		Subsectors.Push (sub);
@@ -330,7 +334,8 @@ bool FNodeBuilder::CheckSubsector (DWORD set, node_t &node, DWORD &splitseg)
 
 	do
 	{
-		D(Printf (PRINT_LOG, " - seg %d(%d,%d)-(%d,%d) line %d front %d back %d\n", seg,
+		D(Printf (PRINT_LOG, " - seg %d%c(%d,%d)-(%d,%d) line %d front %d back %d\n", seg,
+			Segs[seg].linedef == -1 ? '+' : ' ',
 			Vertices[Segs[seg].v1].x>>16, Vertices[Segs[seg].v1].y>>16,
 			Vertices[Segs[seg].v2].x>>16, Vertices[Segs[seg].v2].y>>16,
 			Segs[seg].linedef,
diff --git a/src/nodebuild.h b/src/nodebuild.h
index a6f0459a..81c7b134 100644
--- a/src/nodebuild.h
+++ b/src/nodebuild.h
@@ -34,6 +34,8 @@ public:
 	FEvent *FindEvent (double distance) const;
 	void DeleteAll ();
 
+	void PrintTree () const { PrintTree (Root); }
+
 private:
 	FEvent Nil;
 	FEvent *Root;
@@ -42,6 +44,8 @@ private:
 	void DeletionTraverser (FEvent *event);
 	FEvent *Successor (FEvent *event) const;
 	FEvent *Predecessor (FEvent *event) const;
+
+	void PrintTree (const FEvent *event) const;
 };
 
 struct FSimpleVert
diff --git a/src/nodebuild_events.cpp b/src/nodebuild_events.cpp
index d7660f58..2b71e01c 100644
--- a/src/nodebuild_events.cpp
+++ b/src/nodebuild_events.cpp
@@ -210,3 +210,17 @@ FEvent *FEventTree::GetMinimum ()
 	}
 	return node;
 }
+
+void FEventTree::PrintTree (const FEvent *event) const
+{
+	// Use the CRT's sprintf so that it shares the same formatting as ZDBSP's output.
+	char buff[100];
+	if (event != &Nil)
+	{
+		PrintTree(event->Left);
+		sprintf(buff, " Distance %g, vertex %d, seg %u\n",
+			sqrt(event->Distance/4294967296.0), event->Info.Vertex, (unsigned)event->Info.FrontSeg);
+		Printf(PRINT_LOG, "%s", buff);
+		PrintTree(event->Right);
+	}
+}
diff --git a/src/nodebuild_extract.cpp b/src/nodebuild_extract.cpp
index 6260ac2f..c0f76987 100644
--- a/src/nodebuild_extract.cpp
+++ b/src/nodebuild_extract.cpp
@@ -78,7 +78,8 @@ void FNodeBuilder::Extract (node_t *&outNodes, int &nodeCount,
 	memcpy (outNodes, &Nodes[0], nodeCount*sizeof(node_t));
 	for (i = 0; i < nodeCount; ++i)
 	{
-		D(Printf(PRINT_LOG, "Node %d:\n", i));
+		D(Printf(PRINT_LOG, "Node %d:  Splitter[%08x,%08x] [%08x,%08x]\n", i,
+			outNodes[i].x, outNodes[i].y, outNodes[i].dx, outNodes[i].dy));
 		// Go backwards because on 64-bit systems, both of the intchildren are
 		// inside the first in-game child.
 		for (int j = 1; j >= 0; --j)
@@ -296,12 +297,14 @@ int FNodeBuilder::CloseSubsector (TArray<glseg_t> &segs, int subsector, vertex_t
 	{
 		seg = &Segs[SegList[j].SegNum];
 		angle_t ang = PointToAngle (Vertices[seg->v1].x - midx, Vertices[seg->v1].y - midy);
-		Printf(PRINT_LOG, "%d%c %5d(%5d,%5d)->%5d(%5d,%5d) - %3.3f  %d,%d\n", j,
+		Printf(PRINT_LOG, "%d%c %5d(%5d,%5d)->%5d(%5d,%5d) - %3.5f  %d,%d  [%08x,%08x]-[%08x,%08x]\n", j,
 			seg->linedef == -1 ? '+' : ':',
 			seg->v1, Vertices[seg->v1].x>>16, Vertices[seg->v1].y>>16,
 			seg->v2, Vertices[seg->v2].x>>16, Vertices[seg->v2].y>>16,
 			double(ang/2)*180/(1<<30),
-			seg->planenum, seg->planefront);
+			seg->planenum, seg->planefront,
+			Vertices[seg->v1].x, Vertices[seg->v1].y,
+			Vertices[seg->v2].x, Vertices[seg->v2].y);
 	}
 #endif
 
@@ -395,12 +398,16 @@ int FNodeBuilder::CloseSubsector (TArray<glseg_t> &segs, int subsector, vertex_t
 	Printf(PRINT_LOG, "Output GL subsector %d:\n", subsector);
 	for (i = segs.Size() - count; i < (int)segs.Size(); ++i)
 	{
-		Printf(PRINT_LOG, "  Seg %5d%c(%5d,%5d)-(%5d,%5d)\n", i,
+		Printf(PRINT_LOG, "  Seg %5d%c(%5d,%5d)-(%5d,%5d)  [%08x,%08x]-[%08x,%08x]\n", i,
 			segs[i].linedef == NULL ? '+' : ' ',
 			segs[i].v1->x>>16,
 			segs[i].v1->y>>16,
 			segs[i].v2->x>>16,
-			segs[i].v2->y>>16);
+			segs[i].v2->y>>16,
+			segs[i].v1->x,
+			segs[i].v1->y,
+			segs[i].v2->x,
+			segs[i].v2->y);
 	}
 #endif
 
diff --git a/src/nodebuild_gl.cpp b/src/nodebuild_gl.cpp
index add4f712..d029e7f6 100644
--- a/src/nodebuild_gl.cpp
+++ b/src/nodebuild_gl.cpp
@@ -83,6 +83,8 @@ double FNodeBuilder::AddIntersection (const node_t &node, int vertex)
 // seg information will be messed up in the generated tree.
 void FNodeBuilder::FixSplitSharers (const node_t &node)
 {
+	D(Printf(PRINT_LOG, "events:\n"));
+	D(Events.PrintTree());
 	for (unsigned int i = 0; i < SplitSharers.Size(); ++i)
 	{
 		DWORD seg = SplitSharers[i].Seg;
@@ -95,6 +97,18 @@ void FNodeBuilder::FixSplitSharers (const node_t &node)
 			continue;
 		}
 
+		// Use the CRT's printf so the formatting matches ZDBSP's
+		D(char buff[200]);
+		D(sprintf(buff, "Considering events on seg %d(%d[%d,%d]->%d[%d,%d]) [%g:%g]\n", seg,
+			Segs[seg].v1,
+			Vertices[Segs[seg].v1].x>>16,
+			Vertices[Segs[seg].v1].y>>16,
+			Segs[seg].v2,
+			Vertices[Segs[seg].v2].x>>16,
+			Vertices[Segs[seg].v2].y>>16,
+			SplitSharers[i].Distance, event->Distance));
+		D(Printf(PRINT_LOG, "%s", buff));
+
 		if (SplitSharers[i].Forward)
 		{
 			event = Events.GetSuccessor (event);
diff --git a/src/nodebuild_utility.cpp b/src/nodebuild_utility.cpp
index b3753392..e7d5865d 100644
--- a/src/nodebuild_utility.cpp
+++ b/src/nodebuild_utility.cpp
@@ -185,6 +185,9 @@ int FNodeBuilder::CreateSeg (int linenum, int sidenum)
 	segnum = (int)Segs.Push (seg);
 	Vertices[seg.v1].segs = segnum;
 	Vertices[seg.v2].segs2 = segnum;
+	D(Printf(PRINT_LOG, "Seg %4d: From line %d, side %s (%5d,%5d)-(%5d,%5d)  [%08x,%08x]-[%08x,%08x]\n", segnum, linenum, sidenum ? "back " : "front",
+		Vertices[seg.v1].x>>16, Vertices[seg.v1].y>>16, Vertices[seg.v2].x>>16, Vertices[seg.v2].y>>16,
+		Vertices[seg.v1].x, Vertices[seg.v1].y, Vertices[seg.v2].x, Vertices[seg.v2].y));
 
 	return segnum;
 }
diff --git a/src/p_glnodes.cpp b/src/p_glnodes.cpp
index 010374cc..e88a3f8e 100644
--- a/src/p_glnodes.cpp
+++ b/src/p_glnodes.cpp
@@ -853,15 +853,18 @@ bool P_LoadGLNodes(MapData * map)
 {
 	if (map->MapLumps[ML_GLZNODES].Reader && map->MapLumps[ML_GLZNODES].Reader->GetLength() != 0)
 	{
-		const int idcheck = MAKE_ID('Z','G','L','N');
-		const int idcheck2 = MAKE_ID('Z','G','L','2');
-		const int idcheck3 = MAKE_ID('X','G','L','N');
-		const int idcheck4 = MAKE_ID('X','G','L','2');
+		const int idcheck1a = MAKE_ID('Z','G','L','N');
+		const int idcheck2a = MAKE_ID('Z','G','L','2');
+		const int idcheck3a = MAKE_ID('Z','G','L','3');
+		const int idcheck1b = MAKE_ID('X','G','L','N');
+		const int idcheck2b = MAKE_ID('X','G','L','2');
+		const int idcheck3b = MAKE_ID('X','G','L','3');
 		int id;
 
 		map->Seek(ML_GLZNODES);
 		map->file->Read (&id, 4);
-		if (id == idcheck || id == idcheck2 || id == idcheck3 || id == idcheck4)
+		if (id == idcheck1a || id == idcheck2a || id == idcheck3a ||
+			id == idcheck1b || id == idcheck2b || id == idcheck3b)
 		{
 			try
 			{
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index 6a300f4d..1edbb181 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -892,7 +892,7 @@ void P_LoadGLZSegs (FileReaderBase &data, int type)
 			BYTE side;
 
 			data >> v1 >> partner;
-			if (type == 2)
+			if (type >= 2)
 			{
 				data >> line;
 			}
@@ -1045,13 +1045,20 @@ void LoadZNodes(FileReaderBase &data, int glnodes)
 
 	for (i = 0; i < numNodes; ++i)
 	{
-		SWORD x, y, dx, dy;
+		if (glnodes < 3)
+		{
+			SWORD x, y, dx, dy;
 
-		data >> x >> y >> dx >> dy;
-		nodes[i].x = x << FRACBITS;
-		nodes[i].y = y << FRACBITS;
-		nodes[i].dx = dx << FRACBITS;
-		nodes[i].dy = dy << FRACBITS;
+			data >> x >> y >> dx >> dy;
+			nodes[i].x = x << FRACBITS;
+			nodes[i].y = y << FRACBITS;
+			nodes[i].dx = dx << FRACBITS;
+			nodes[i].dy = dy << FRACBITS;
+		}
+		else
+		{
+			data >> nodes[i].x >> nodes[i].y >> nodes[i].dx >> nodes[i].dy;
+		}
 		for (int j = 0; j < 2; ++j)
 		{
 			for (int k = 0; k < 4; ++k)
@@ -1100,6 +1107,11 @@ void P_LoadZNodes (FileReader &dalump, DWORD id)
 		compressed = true;
 		break;
 
+	case MAKE_ID('Z','G','L','3'):
+		type = 3;
+		compressed = true;
+		break;
+
 	case MAKE_ID('X','N','O','D'):
 		type = 0;
 		compressed = false;
@@ -1115,6 +1127,11 @@ void P_LoadZNodes (FileReader &dalump, DWORD id)
 		compressed = false;
 		break;
 
+	case MAKE_ID('X','G','L','3'):
+		type = 3;
+		compressed = false;
+		break;
+
 	default:
 		return;
 	}
@@ -3680,7 +3697,7 @@ void P_SetupLevel (char *lumpname, int position)
 	{
 		// Check for compressed nodes first, then uncompressed nodes
 		FWadLump test;
-		DWORD id = MAKE_ID('X','x','X','x'), idcheck = 0, idcheck2 = 0, idcheck3 = 0, idcheck4 = 0;
+		DWORD id = MAKE_ID('X','x','X','x'), idcheck = 0, idcheck2 = 0, idcheck3 = 0, idcheck4 = 0, idcheck5 = 0, idcheck6 = 0;
 
 		if (map->Size(ML_ZNODES) != 0)
 		{
@@ -3694,12 +3711,14 @@ void P_SetupLevel (char *lumpname, int position)
 			map->Seek(ML_GLZNODES);
 			idcheck = MAKE_ID('Z','G','L','N');
 			idcheck2 = MAKE_ID('Z','G','L','2');
-			idcheck3 = MAKE_ID('X','G','L','N');
-			idcheck4 = MAKE_ID('X','G','L','2');
+			idcheck3 = MAKE_ID('Z','G','L','3');
+			idcheck4 = MAKE_ID('X','G','L','N');
+			idcheck5 = MAKE_ID('X','G','L','2');
+			idcheck6 = MAKE_ID('X','G','L','3');
 		}
 
 		map->file->Read (&id, 4);
-		if (id != 0 && (id == idcheck || id == idcheck2 || id == idcheck3 || id == idcheck4))
+		if (id != 0 && (id == idcheck || id == idcheck2 || id == idcheck3 || id == idcheck4 || id == idcheck5 || id == idcheck6))
 		{
 			try
 			{
diff --git a/src/svnrevision.h b/src/svnrevision.h
index 3dfbb509..52402229 100644
--- a/src/svnrevision.h
+++ b/src/svnrevision.h
@@ -3,5 +3,5 @@
 // This file was automatically generated by the
 // updaterevision tool. Do not edit by hand.
 
-#define ZD_SVN_REVISION_STRING "3978"
+#define ZD_SVN_REVISION_STRING "3982"
 #define ZD_SVN_REVISION_NUMBER 3978