Added, Visual mode: added "Toggle Alpha-based Texture Highlighting" action. When enabled, 3d floor textures and middle textures on double-sided lines will be highlighted only when the crosshair points at a non-transparent pixel.

Changed: multi-part sectors are now better preserved after drawing new lines.
Changed, TEXTURES parser: patch loading errors are now ignored for textures with "NullTexture" option.
Changed, Game configurations: changed default door action arguments to better match vanilla ones.
Fixed, Actions: in some cases keyboard shortcuts involving Ctrl/Alt/Shift modifier keys were displayed incorrectly.
Fixed(?): probably fixed inability to save map wad in Slade 3.
Updated ZDoom_ACS.cfg.
Updated ZDoom_DECORATE.cfg.
Updated ZDoom ACC.

.gitignore

@@ -463,3 +463,4 @@
 /Build/D3D9.dll
 /Build/D3D8.dll
 /UpgradeLog.htm
+/UpgradeLog2.htm

Build/Compilers/ZDoom/zdefs.acs

@@ -1086,3 +1086,17 @@
 #define WARPF_USEPTR 0x2000
 #define WARPF_COPYVELOCITY 0x4000
 #define WARPF_COPYPITCH 0x8000
+
+#define CPXF_ANCESTOR    (1 << 0)
+#define CPXF_LESSOREQUAL (1 << 1)
+#define CPXF_NOZ         (1 << 2)
+#define CPXF_COUNTDEAD   (1 << 3)
+#define CPXF_DEADONLY    (1 << 4)
+#define CPXF_EXACT       (1 << 5)
+#define CPXF_SETTARGET   (1 << 6)
+#define CPXF_SETMASTER   (1 << 7)
+#define CPXF_SETTRACER   (1 << 8)
+#define CPXF_FARTHEST    (1 << 9)
+#define CPXF_CLOSEST     (1 << 10)
+#define CPXF_SETONPTR    (1 << 11)
+#define CPXF_CHECKSIGHT  (1 << 12)

Build/Compilers/ZDoom/zspecial.acs

@@ -363,8 +363,9 @@ special
 	-93:GetMaxInventory(2),
 	-94:SetSectorDamage(2,5),
 	-95:SetSectorTerrain(3),
-	-96:SpawnParticle(1,15),
+	-96:SpawnParticle(1,16),
 	-97:SetMusicVolume(1),
+	-98:CheckProximity(3, 6),
 	
 	// Zandronum's
 	-100:ResetMap(0),

Build/Configurations/Includes/Hexen_linedefs.cfg

@@ -400,7 +400,7 @@ door
 			title = "Movement Speed";
 			type = 11;
 			enum = "door_speeds";
-			default = 32;
+			default = 16;
 		}
 		
 		arg2
@@ -426,7 +426,7 @@ door
 			title = "Movement Speed";
 			type = 11;
 			enum = "door_speeds";
-			default = 32;
+			default = 16;
 		}
 		
 		arg2
@@ -452,7 +452,7 @@ door
 			title = "Movement Speed";
 			type = 11;
 			enum = "door_speeds";
-			default = 32;
+			default = 16;
 		}
 		
 		arg2
@@ -460,7 +460,7 @@ door
 			title = "Close Delay";
 			type = 11;
 			enum = "reset_tics";
-			default = 105;
+			default = 150;
 		}
 		
 		arg3
@@ -486,7 +486,7 @@ door
 			title = "Movement Speed";
 			type = 11;
 			enum = "door_speeds";
-			default = 32;
+			default = 16;
 		}
 		
 		arg2
@@ -494,7 +494,7 @@ door
 			title = "Close Delay";
 			type = 11;
 			enum = "reset_tics";
-			default = 105;
+			default = 150;
 		}
 		
 		arg3

Build/Configurations/Includes/ZDoom_linedefs.cfg

@@ -675,14 +675,14 @@ zdoom
 				title = "Animation Speed";
 				type = 11;
 				enum = "door_speeds";
-				default = 32;
+				default = 16;
 			}
 			arg2
 			{
 				title = "Close Delay";
 				type = 11;
 				enum = "reset_tics";
-				default = 140;
+				default = 150;
 			}
 			arg3
 			{

Build/Configurations/Includes/ZDoom_misc.cfg

@@ -854,6 +854,7 @@ enums
 		70 = "70: 2 Seconds";
 		105 = "105: 3 Seconds";
 		140 = "140: 4 Seconds";
+		150 = "150: Doom default";
 		175 = "175: 5 Seconds";
 		210 = "210: 6 Seconds";
 		245 = "245: 7 Seconds";

Build/Scripting/ZDoom_ACS.cfg

@@ -110,6 +110,7 @@ keywords
 	CheckFont = "bool CheckFont(str fontname)";
 	CheckInventory = "int CheckInventory(str inventory_item)\nChecks the inventory of the actor who activated the script for the item specified by inventory_item";
 	CheckPlayerCamera = "int CheckPlayerCamera(int player)";
+	CheckProximity = "bool CheckProximity(int tid, str classname, float distance[, int count = 1[, int flags = 0[, int pointer = AAPTR_DEFAULT]]])";
 	CheckSight = "bool CheckSight(int source, int dest, int flags)";
 	CheckWeapon = "bool CheckWeapon(str weapon)\nChecks if player's active weapon is the weapon with specified class name.";
 	ClassifyActor = "int ClassifyActor(int tid)";
@@ -658,6 +659,19 @@ constants
 	CLASS_CLERIC;
 	CLASS_FIGHTER;
 	CLASS_MAGE;
+	CPXF_ANCESTOR;
+	CPXF_LESSOREQUAL;
+	CPXF_NOZ;
+	CPXF_COUNTDEAD;
+	CPXF_DEADONLY;
+	CPXF_EXACT;
+	CPXF_SETTARGET;
+	CPXF_SETMASTER;
+	CPXF_SETTRACER;
+	CPXF_FARTHEST;
+	CPXF_CLOSEST;
+	CPXF_SETONPTR;
+	CPXF_CHECKSIGHT;
 	CR_BLACK;
 	CR_BLUE;
 	CR_BRICK;

Build/Scripting/ZDoom_DECORATE.cfg

@@ -85,7 +85,7 @@ keywords
 	A_FaceTarget = "A_FaceTarget[(float angle = 0.0[, float pitch = 270.0])]\nA_FaceTarget([float max_turn = 0.0[, float max_pitch = 270.0[, float ang_offset = 0.0[, float pitch_offset = 0.0[, int flags = 0[, float z_add = 0.0]]]]]])";
 	A_FaceMaster = "A_FaceMaster[(float angle = 0.0[, float pitch = 270.0])]\nA_FaceMaster([float max_turn = 0.0[, float max_pitch = 270.0[, float ang_offset = 0.0[, float pitch_offset = 0.0[, int flags = 0[, float z_add = 0.0]]]]]])";
 	A_FastChase = "A_FastChase";
-	A_KillChildren = "A_KillChildren[(str damagetype = \"None\"[, int flags = 0[, str filter = \"None\[, str species = \"None\"[, int src = AAPTR_DEFAULT[, int inflictor = AAPTR_DEFAULT]]]]])]\ndamagetype: if the actor dies, the actor will enter a death state based on damagetype if present (or pain state if using NODAMAGE).\nflags: KILS flags.\nfilter: the actor class to damage.\nspecies: the actor species to damage.";
+	A_KillChildren = "A_KillChildren[(str damagetype = \"None\"[, int flags = 0[, str filter = \"None\"[, str species = \"None\"[, int src = AAPTR_DEFAULT[, int inflictor = AAPTR_DEFAULT]]]]])]\ndamagetype: if the actor dies, the actor will enter a death state based on damagetype if present (or pain state if using NODAMAGE).\nflags: KILS flags.\nfilter: the actor class to damage.\nspecies: the actor species to damage.";
 	A_KillMaster = "A_KillMaster[(str damagetype = \"None\"[, int flags = 0[, str filter = \"None\"[, str species = \"None\"[, int src = AAPTR_DEFAULT[, int inflictor = AAPTR_DEFAULT]]]]])]\ndamagetype: if the actor dies, the actor will enter a death state based on damagetype if present (or pain state if using NODAMAGE).\nflags: KILS flags.\nfilter: the actor class to damage.\nspecies: the actor species to damage.";
 	A_KillSiblings = "A_KillSiblings[(str damagetype = \"None\"[, int flags = 0[, str filter = \"None\"[, str species = \"None\"[, int src = AAPTR_DEFAULT[, int inflictor = AAPTR_DEFAULT]]]]])]\ndamagetype: if the actor dies, the actor will enter a death state based on damagetype if present (or pain state if using NODAMAGE).\nflags: KILS flags.\nfilter: the actor class to damage.\nspecies: the actor species to damage.";
 	A_KillTarget = "A_KillTarget[(str damagetype = \"None\"[, int flags = 0[, str filter = \"None\"[, str species = \"None\"[, int src = AAPTR_DEFAULT[, int inflictor = AAPTR_DEFAULT]]]]])]\ndamagetype: if the actor dies, the actor will enter a death state based on damagetype if present (or pain state if using NODAMAGE).\nflags: KILS flags.\nfilter: the actor class to damage.\nspecies: the actor species to damage.";
@@ -427,6 +427,8 @@ keywords
 	GetZAt = "float GetZAt([float x = 0.0[, float y = 0.0[, float angle = 0.0[, int flags = 0[, int pick_pointer = AAPTR_TARGET]]]]])";
 	GetGibHealth = "int GetGibHealth()";
 	GetCrouchFactor = "float GetCrouchFactor(int ptr = AAPTR_PLAYER1)";
+	GetCVar = "int GetCVar(str name)";
+	GetUserCVar = "int GetUserCVar(int playernum, str name)";
 }
 
 properties
@@ -1245,6 +1247,7 @@ constants
 	SMF_PRECISE;
 	SPF_FORCECLAMP;
 	SPF_INTERPOLATE;
+	SPF_NOTIMEFREEZE;
 	TF_TELEFRAG;
 	TF_RANDOMDECIDE;
 	TF_FORCED;

Source/Core/Actions/Action.cs

@@ -133,15 +133,19 @@ namespace CodeImp.DoomBuilder.Actions
 			int button = key & ~((int)Keys.Control | (int)Keys.Shift | (int)Keys.Alt);
 
 			// When the button is a control key, then remove the control itsself
-			if((button == (int)Keys.ControlKey) ||
+			if((button == (int)Keys.ControlKey) || (button == (int)Keys.ShiftKey) || (button == (int)Keys.Alt))
-			   (button == (int)Keys.ShiftKey))
 			{
 				ctrl = 0;
 				key = key & ~((int)Keys.Control | (int)Keys.Shift | (int)Keys.Alt);
 			}
 			
-			// Determine control prefix
+			//mxd. Determine control prefix
-			if(ctrl != 0) ctrlprefix = conv.ConvertToString(key);
+			if(ctrl != 0)
+			{
+				if((key & (int)Keys.Control) != 0) ctrlprefix += "Ctrl+";
+				if((key & (int)Keys.Alt) != 0) ctrlprefix += "Alt+";
+				if((key & (int)Keys.Shift) != 0) ctrlprefix += "Shift+";
+			}
 			
 			// Check if button is special
 			switch(button)

Source/Core/Builder.csproj

@@ -73,7 +73,7 @@
     <PlatformTarget>x86</PlatformTarget>
     <UseVSHostingProcess>false</UseVSHostingProcess>
     <ErrorReport>prompt</ErrorReport>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;PROFILE</DefineConstants>
   </PropertyGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 

Source/Core/General/MapManager.cs

@@ -1392,7 +1392,7 @@ namespace CodeImp.DoomBuilder
 
 						// Create new, emtpy lump
 						General.WriteLogLine(lumpname + " is required! Created empty lump.");
-						target.Insert(lumpname, insertindex, 0);
+						target.Insert(lumpname, insertindex, 0, false);
 					}
 					else
 					{
@@ -1401,6 +1401,8 @@ namespace CodeImp.DoomBuilder
 					}
 				}
 			}
+
+			target.WriteHeaders(); //mxd
 		}
 
 		//mxd. This is called on tempwad, which should only have the current map inside it.
@@ -1468,11 +1470,13 @@ namespace CodeImp.DoomBuilder
 				if(!skipping) 
 				{
 					// Copy lump over!
-					Lump tgtlump = target.Insert(srclump.Name, target.Lumps.Count, srclump.Length);
+					Lump tgtlump = target.Insert(srclump.Name, target.Lumps.Count, srclump.Length, false);
 					srclump.CopyTo(tgtlump);
 				}
 			}
 
+			target.WriteHeaders(); //mxd
+
 			return headerpos;
 		}
 
@@ -1531,7 +1535,7 @@ namespace CodeImp.DoomBuilder
 							// Copy the lump to the target
 							//General.WriteLogLine(srclumpname + " copying as " + tgtlumpname);
 							Lump lump = source.Lumps[sourceindex];
-							Lump newlump = target.Insert(tgtlumpname, targetindex, lump.Length);
+							Lump newlump = target.Insert(tgtlumpname, targetindex, lump.Length, false);
 							lump.CopyTo(newlump);
 
 							//mxd. We still need to increment targetindex...
@@ -1548,6 +1552,8 @@ namespace CodeImp.DoomBuilder
 						}
 					}
 				}
+
+				target.WriteHeaders(); //mxd
 			}
 		}
 

Source/Core/Geometry/Tools.cs

@@ -2177,6 +2177,7 @@ namespace CodeImp.DoomBuilder.Geometry
 		public static void SplitOuterSectors(IEnumerable<Linedef> drawnlines)
 		{
 			Dictionary<Sector, HashSet<Sidedef>> sectorsidesref = new Dictionary<Sector, HashSet<Sidedef>>();
+			HashSet<Sidedef> drawnsides = new HashSet<Sidedef>();
 
 			// Create drawn lines per sector collection
 			foreach(Linedef l in drawnlines)
@@ -2185,12 +2186,14 @@ namespace CodeImp.DoomBuilder.Geometry
 				{
 					if(!sectorsidesref.ContainsKey(l.Front.Sector)) sectorsidesref.Add(l.Front.Sector, new HashSet<Sidedef>());
 					sectorsidesref[l.Front.Sector].Add(l.Front);
+					drawnsides.Add(l.Front);
 				}
 
 				if(l.Back != null && (l.Back.Sector != null && !SectorWasInvalid(l.Back.Sector)))
 				{
 					if(!sectorsidesref.ContainsKey(l.Back.Sector)) sectorsidesref.Add(l.Back.Sector, new HashSet<Sidedef>());
 					sectorsidesref[l.Back.Sector].Add(l.Back);
+					drawnsides.Add(l.Back);
 				}
 			}
 
@@ -2211,20 +2214,38 @@ namespace CodeImp.DoomBuilder.Geometry
 					if(side.Sector != group.Key) continue;
 
 					// Find drawing interior
-					List<LinedefSide> sides = FindPotentialSectorAt(side.Line, side.IsFront);
+					List<LinedefSide> linedefsides = FindPotentialSectorAt(side.Line, side.IsFront);
 
 					// Number of potential sides fewer than the sector has?
-					if(sides != null && sides.Count > 0 && sides.Count < group.Key.Sidedefs.Count)
+					if(linedefsides != null && linedefsides.Count > 0 && linedefsides.Count < group.Key.Sidedefs.Count)
 					{
-						Sector newsector = MakeSector(sides, null, false);
+						// Collect sidedefs from new sector shape...
-						if(newsector != null)
+						HashSet<Sidedef> newsectorsides = new HashSet<Sidedef>();
+						foreach(LinedefSide ls in linedefsides)
 						{
-							newsector.UpdateCache();
+							Sidedef s = (ls.Front ? ls.Line.Front : ls.Line.Back);
-							group.Key.UpdateCache();
+							if(s != null) newsectorsides.Add(s);
 						}
 
-						// Existing sector may've become invalid
+						// Make new sector only if one of the remaining sector sides was also drawn...
-						SectorWasInvalid(group.Key);
+						foreach(Sidedef s in group.Key.Sidedefs)
+						{
+							if(newsectorsides.Contains(s)) continue;
+							if(drawnsides.Contains(s))
+							{
+								Sector newsector = MakeSector(linedefsides, null, false);
+								if(newsector != null)
+								{
+									newsector.UpdateCache();
+									group.Key.UpdateCache();
+								}
+
+								// Existing sector may've become invalid
+								SectorWasInvalid(group.Key);
+
+								break;
+							}
+						}
 					}
 				}
 			}

Source/Core/IO/WAD.cs

@@ -366,7 +366,8 @@ namespace CodeImp.DoomBuilder.IO
 		#region ================== Lumps
 
 		// This creates a new lump in the WAD file
-		public Lump Insert(string name, int position, int datalength)
+		public Lump Insert(string name, int position, int datalength) { return Insert(name, position, datalength, true); } //mxd
+		public Lump Insert(string name, int position, int datalength, bool writeheaders)
 		{
 			// We will be adding a lump
 			numlumps++;
@@ -382,7 +383,7 @@ namespace CodeImp.DoomBuilder.IO
 			lumpsoffset += datalength;
 
 			// Write the new headers
-			WriteHeaders();
+			if(writeheaders) WriteHeaders();
 
 			// Return the new lump
 			return lump;

Source/Core/Map/Sidedef.cs

@@ -341,7 +341,7 @@ namespace CodeImp.DoomBuilder.Map
 			if(force || ((linedef.Tag == 0) && (linedef.Action == 0) && (sector.Tag == 0) &&
 				((Other == null) || (Other.sector.Tag == 0))))
 			{
-				/*if(!HighRequired())
+				if(General.Settings.AutoClearSidedefTextures && !HighRequired())
 				{
 					BeforePropsChange(); //mxd
 					changed = true;
@@ -349,13 +349,13 @@ namespace CodeImp.DoomBuilder.Map
 					this.longtexnamehigh = MapSet.EmptyLongName;
 					General.Map.IsChanged = true;
 				} 
-				else*/ if(shiftmiddle && this.longtexnamehigh == MapSet.EmptyLongName && HighRequired()) //mxd
+				else if(shiftmiddle && this.longtexnamehigh == MapSet.EmptyLongName && HighRequired()) //mxd
 				{
 					SetTextureHigh(this.texnamemid);
 					changed = true;
 				}
 
-				/*if(!LowRequired())
+				if(General.Settings.AutoClearSidedefTextures && !LowRequired())
 				{
 					if(!changed) //mxd
 					{
@@ -366,7 +366,7 @@ namespace CodeImp.DoomBuilder.Map
 					this.longtexnamelow = MapSet.EmptyLongName;
 					General.Map.IsChanged = true;
 				}
-				else*/ if(shiftmiddle && this.longtexnamelow == MapSet.EmptyLongName && LowRequired()) //mxd 
+				else if(shiftmiddle && this.longtexnamelow == MapSet.EmptyLongName && LowRequired()) //mxd 
 				{
 					SetTextureLow(this.texnamemid);
 					changed = true;

Source/Core/Windows/PreferencesForm.Designer.cs

@@ -33,7 +33,6 @@ namespace CodeImp.DoomBuilder.Windows
 		{
 			this.components = new System.ComponentModel.Container();
 			System.Windows.Forms.Label label7;
-			System.Windows.Forms.Label label6;
 			System.Windows.Forms.Label label5;
 			System.Windows.Forms.GroupBox groupBox1;
 			System.Windows.Forms.Label label1;
@@ -238,7 +237,6 @@ namespace CodeImp.DoomBuilder.Windows
 			this.toolTip1 = new System.Windows.Forms.ToolTip(this.components);
 			this.browseScreenshotsFolderDialog = new System.Windows.Forms.FolderBrowserDialog();
 			label7 = new System.Windows.Forms.Label();
-			label6 = new System.Windows.Forms.Label();
 			label5 = new System.Windows.Forms.Label();
 			groupBox1 = new System.Windows.Forms.GroupBox();
 			label1 = new System.Windows.Forms.Label();
@@ -301,15 +299,6 @@ namespace CodeImp.DoomBuilder.Windows
 			label7.TabIndex = 7;
 			label7.Text = "Or select a special input control here:";
 			// 
-			// label6
-			// 
-			label6.AutoSize = true;
-			label6.Location = new System.Drawing.Point(20, 30);
-			label6.Name = "label6";
-			label6.Size = new System.Drawing.Size(40, 13);
-			label6.TabIndex = 2;
-			label6.Text = "Action:";
-			// 
 			// label5
 			// 
 			label5.AutoSize = true;
@@ -1556,14 +1545,13 @@ namespace CodeImp.DoomBuilder.Windows
 			this.actioncontrolpanel.Controls.Add(label7);
 			this.actioncontrolpanel.Controls.Add(this.actiontitle);
 			this.actioncontrolpanel.Controls.Add(this.actioncontrolclear);
-			this.actioncontrolpanel.Controls.Add(label6);
 			this.actioncontrolpanel.Controls.Add(this.actionkey);
 			this.actioncontrolpanel.Controls.Add(label5);
 			this.actioncontrolpanel.Enabled = false;
 			this.actioncontrolpanel.Location = new System.Drawing.Point(377, 12);
 			this.actioncontrolpanel.Margin = new System.Windows.Forms.Padding(6);
 			this.actioncontrolpanel.Name = "actioncontrolpanel";
-			this.actioncontrolpanel.Size = new System.Drawing.Size(282, 511);
+			this.actioncontrolpanel.Size = new System.Drawing.Size(296, 511);
 			this.actioncontrolpanel.TabIndex = 9;
 			this.actioncontrolpanel.TabStop = false;
 			this.actioncontrolpanel.Text = " Action control ";
@@ -1575,7 +1563,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.actiondescription.Multiline = true;
 			this.actiondescription.Name = "actiondescription";
 			this.actiondescription.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
-			this.actiondescription.Size = new System.Drawing.Size(256, 72);
+			this.actiondescription.Size = new System.Drawing.Size(266, 72);
 			this.actiondescription.TabIndex = 12;
 			// 
 			// keyusedlist
@@ -1587,7 +1575,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.keyusedlist.Location = new System.Drawing.Point(23, 307);
 			this.keyusedlist.Name = "keyusedlist";
 			this.keyusedlist.SelectionMode = System.Windows.Forms.SelectionMode.None;
-			this.keyusedlist.Size = new System.Drawing.Size(238, 115);
+			this.keyusedlist.Size = new System.Drawing.Size(263, 115);
 			this.keyusedlist.Sorted = true;
 			this.keyusedlist.TabIndex = 11;
 			this.keyusedlist.Visible = false;
@@ -1596,12 +1584,12 @@ namespace CodeImp.DoomBuilder.Windows
 			// 
 			this.disregardshiftlabel.Location = new System.Drawing.Point(20, 224);
 			this.disregardshiftlabel.Name = "disregardshiftlabel";
-			this.disregardshiftlabel.Size = new System.Drawing.Size(245, 47);
+			this.disregardshiftlabel.Size = new System.Drawing.Size(266, 47);
 			this.disregardshiftlabel.TabIndex = 9;
-			this.disregardshiftlabel.Tag = "The selected actions uses %s to modify its behavior. These modifiers can not be u" +
+			this.disregardshiftlabel.Tag = "The selected action uses %s to modify its behavior. These modifiers can not be us" +
-    "sed in a key combination for this action.";
+				"ed in a key combination for this action.";
-			this.disregardshiftlabel.Text = "The selected actions uses Shift, Alt and Control to modify its behavior. These mo" +
+			this.disregardshiftlabel.Text = "The selected action uses Shift, Alt and Control to modify its behavior. These mod" +
-    "difiers can not be used in a key combination for this action.";
+				"ifiers can not be used in a key combination for this action.";
 			this.disregardshiftlabel.Visible = false;
 			// 
 			// actioncontrol
@@ -1611,7 +1599,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.actioncontrol.ImeMode = System.Windows.Forms.ImeMode.Off;
 			this.actioncontrol.Location = new System.Drawing.Point(23, 190);
 			this.actioncontrol.Name = "actioncontrol";
-			this.actioncontrol.Size = new System.Drawing.Size(238, 21);
+			this.actioncontrol.Size = new System.Drawing.Size(196, 21);
 			this.actioncontrol.TabIndex = 8;
 			this.actioncontrol.TabStop = false;
 			this.actioncontrol.SelectedIndexChanged += new System.EventHandler(this.actioncontrol_SelectedIndexChanged);
@@ -1620,7 +1608,7 @@ namespace CodeImp.DoomBuilder.Windows
 			// 
 			this.actiontitle.AutoSize = true;
 			this.actiontitle.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
-			this.actiontitle.Location = new System.Drawing.Point(67, 30);
+			this.actiontitle.Location = new System.Drawing.Point(17, 29);
 			this.actiontitle.Name = "actiontitle";
 			this.actiontitle.Size = new System.Drawing.Size(176, 13);
 			this.actiontitle.TabIndex = 1;

Source/Core/Windows/PreferencesForm.resx

@@ -120,9 +120,6 @@
   <metadata name="label7.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>False</value>
   </metadata>
-  <metadata name="label6.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
-    <value>False</value>
-  </metadata>
   <metadata name="label5.GenerateMember" type="System.Boolean, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
     <value>False</value>
   </metadata>

Source/Plugins/BuilderModes/General/BuilderPlug.cs

@@ -135,6 +135,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		private bool syncSelection; //mxd. Sync selection between Visual and Classic modes.
 		private bool lockSectorTextureOffsetsWhileDragging; //mxd
 		private bool syncthingedit; //mxd
+		private bool alphabasedtexturehighlighting; //mxd
 		
 		#endregion
 
@@ -191,6 +192,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		public bool SyncSelection { get { return syncSelection; } set { syncSelection = value; } } //mxd
 		public bool LockSectorTextureOffsetsWhileDragging { get { return lockSectorTextureOffsetsWhileDragging; } internal set { lockSectorTextureOffsetsWhileDragging = value; } } //mxd
 		public bool SyncronizeThingEdit { get { return syncthingedit; } internal set { syncthingedit = value; } } //mxd
+		public bool AlphaBasedTextureHighlighting { get { return alphabasedtexturehighlighting; } internal set { alphabasedtexturehighlighting = value; } } //mxd
 
 		//mxd. "Make Door" action persistent settings
 		internal MakeDoorSettings MakeDoor;
@@ -325,10 +327,11 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		//mxd. Load settings, which can be changed via UI
 		private void LoadUISettings()
 		{
-			lockSectorTextureOffsetsWhileDragging = General.Settings.ReadPluginSetting("locktextureoffsets", false); //mxd
+			lockSectorTextureOffsetsWhileDragging = General.Settings.ReadPluginSetting("locktextureoffsets", false);
 			viewselectionnumbers = General.Settings.ReadPluginSetting("viewselectionnumbers", true);
-			viewselectioneffects = General.Settings.ReadPluginSetting("viewselectioneffects", true); //mxd
+			viewselectioneffects = General.Settings.ReadPluginSetting("viewselectioneffects", true);
-			syncthingedit = General.Settings.ReadPluginSetting("syncthingedit", true); //mxd
+			syncthingedit = General.Settings.ReadPluginSetting("syncthingedit", true);
+			alphabasedtexturehighlighting = General.Settings.ReadPluginSetting("alphabasedtexturehighlighting", true);
 		}
 
 		//mxd. Save settings, which can be changed via UI
@@ -338,6 +341,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			General.Settings.WritePluginSetting("viewselectionnumbers", viewselectionnumbers);
 			General.Settings.WritePluginSetting("viewselectioneffects", viewselectioneffects);
 			General.Settings.WritePluginSetting("syncthingedit", syncthingedit);
+			General.Settings.WritePluginSetting("alphabasedtexturehighlighting", alphabasedtexturehighlighting);
 		}
 
 		//mxd. These should be reset when changing maps

Source/Plugins/BuilderModes/Resources/Actions.cfg

@@ -1343,6 +1343,17 @@ toggleskew
 	default = 262231;
 }
 
+//mxd
+alphabasedtexturehighlighting
+{
+	title = "Toggle Alpha-based Texture Highlighting";
+	category = "visual";
+	description = "Toggles Alpha-based Texture Highlighting. When enabled, 3d floor textures and middle textures on double-sided lines will be highlighted only when the crosshair points at a non-transparent pixel.";
+	allowkeys = true;
+	allowmouse = true;
+	allowscroll = true;	
+}
+
 placevisualstart
 {
 	title = "Place Visual Mode Camera";

Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs

@@ -4416,6 +4416,15 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			UpdateChangedObjects();
 		}
 
+
+		//mxd
+		[BeginAction("alphabasedtexturehighlighting")]
+		public void ToggleAlphaBasedTextureHighlighting()
+		{
+			BuilderPlug.Me.AlphaBasedTextureHighlighting = !BuilderPlug.Me.AlphaBasedTextureHighlighting;
+			General.Interface.DisplayStatus(StatusType.Info, "Alpha-based textures highlighting is " + (BuilderPlug.Me.AlphaBasedTextureHighlighting ? "ENABLED" : "DISABLED"));
+		}
+
 		#endregion
 
 		#region ================== Texture Alignment

Source/Plugins/BuilderModes/VisualModes/VisualCeiling.cs

@@ -555,11 +555,11 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			Sidedef sd = MapSet.NearestSidedef(Sector.Sector.Sidedefs, pickintersect);
 			float side = sd.Line.SideOfLine(pickintersect);
 
-            //mxd. Alpha based picking. Used only on extrafloors with transparent or masked textures
+			//mxd. Alpha based picking. Used only on extrafloors with transparent or masked textures
-            if ((side <= 0.0f && sd.IsFront) || (side > 0.0f && !sd.IsFront))
+			if((side <= 0.0f && sd.IsFront) || (side > 0.0f && !sd.IsFront))
-            {
+			{
-                if (!Texture.IsImageLoaded || extrafloor == null || RenderPass == RenderPass.Solid || (!Texture.IsTranslucent && !Texture.IsMasked))
+				if(!BuilderPlug.Me.AlphaBasedTextureHighlighting || !Texture.IsImageLoaded || extrafloor == null || RenderPass == RenderPass.Solid || (!Texture.IsTranslucent && !Texture.IsMasked))
-                    return true;
+					return true;
 
                 // Fetch ZDoom fields
                 float rotate = Angle2D.DegToRad(level.sector.Fields.GetValue("rotationceiling", 0.0f));

Source/Plugins/BuilderModes/VisualModes/VisualFloor.cs

@@ -509,11 +509,11 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			Sidedef sd = MapSet.NearestSidedef(Sector.Sector.Sidedefs, pickintersect);
 			float side = sd.Line.SideOfLine(pickintersect);
 
-            //mxd. Alpha based picking. Used only on extrafloors with transparent or masked textures
+			//mxd. Alpha based picking. Used only on extrafloors with transparent or masked textures
-            if ((side <= 0.0f && sd.IsFront) || (side > 0.0f && !sd.IsFront))
+			if((side <= 0.0f && sd.IsFront) || (side > 0.0f && !sd.IsFront))
-            {
+			{
-                if (!Texture.IsImageLoaded || extrafloor == null || RenderPass == RenderPass.Solid || (!Texture.IsTranslucent && !Texture.IsMasked))
+				if(!BuilderPlug.Me.AlphaBasedTextureHighlighting || !Texture.IsImageLoaded || extrafloor == null || RenderPass == RenderPass.Solid || (!Texture.IsTranslucent && !Texture.IsMasked))
-                    return true;
+					return true;
 
                 // Fetch ZDoom fields
                 float rotate = Angle2D.DegToRad(level.sector.Fields.GetValue("rotationfloor", 0.0f));

Source/Plugins/BuilderModes/VisualModes/VisualMiddle3D.cs

@@ -382,10 +382,10 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			return base.PickFastReject(from, to, dir);
 		}
 
-        //mxd. Alpha based picking
+		//mxd. Alpha based picking
-        public override bool PickAccurate(Vector3D from, Vector3D to, Vector3D dir, ref float u_ray)
+		public override bool PickAccurate(Vector3D from, Vector3D to, Vector3D dir, ref float u_ray)
-        {
+		{
-            if (!Texture.IsImageLoaded || (!Texture.IsTranslucent && !Texture.IsMasked)) return base.PickAccurate(from, to, dir, ref u_ray);
+			if(!BuilderPlug.Me.AlphaBasedTextureHighlighting || !Texture.IsImageLoaded || (!Texture.IsTranslucent && !Texture.IsMasked)) return base.PickAccurate(from, to, dir, ref u_ray);
 
             float u;
             Sidedef sourceside = extrafloor.Linedef.Front;

Source/Plugins/BuilderModes/VisualModes/VisualMiddleDouble.cs

@@ -399,7 +399,7 @@ namespace CodeImp.DoomBuilder.BuilderModes
 		//mxd. Alpha based picking
 		public override bool PickAccurate(Vector3D from, Vector3D to, Vector3D dir, ref float u_ray) 
 		{
-            if (!Texture.IsImageLoaded || (!Texture.IsTranslucent && !Texture.IsMasked)) return base.PickAccurate(from, to, dir, ref u_ray);
+			if(!BuilderPlug.Me.AlphaBasedTextureHighlighting || !Texture.IsImageLoaded || (!Texture.IsTranslucent && !Texture.IsMasked)) return base.PickAccurate(from, to, dir, ref u_ray);
 
             float u;
 			new Line2D(from, to).GetIntersection(Sidedef.Line.Line, out u);