More progress.

- AMBUSH flag on nodes makes them blind and untargetable when getting `startnode` and `goalnode` for `FindPath()`. This is useful for indicating a node should be skipped when tele/portaling, so the current path can be preserved.
- Setup is simple: place nodes behind lines that tele/portal entities and mark them as AMBUSH.

Other changes:

- Restored global array since blockmap is not a viable option here.
- Added MAPINFO `pathing` flag which enables pathing by default.
- Added NOPATHING flag to disable pathing entirely, useful for maps that have pathing enabled.
- Added `ReachedNode(Actor mo)` virtual, responsible for handling node traversal.
- Nodes now make use of MeleeRange to limit their sight checking functions.

src/g_level.cpp

@@ -2506,26 +2506,25 @@ static void ReconstructPath(TMap<AActor*, AActor*> &cameFrom, AActor* current, T
 	while(tmp = cameFrom.CheckKey(*tmp));
 }
 
-static AActor* FindClosestNode(AActor* from, double maxSearch)
+static AActor* FindClosestNode(AActor* from)
 {
 	static PClass * nodeCls = PClass::FindClass(NAME_PathNode);
 
-	FPortalGroupArray check(FPortalGroupArray::PGA_Full3d);
-	FMultiBlockThingsIterator it(check, from->Level, from->Pos().X, from->Pos().Y, from->Pos().Z - ((from->Height + maxSearch) / 2), from->Height + maxSearch, from->radius + maxSearch, false, from->Sector);
-	FMultiBlockThingsIterator::CheckResult res;
-
 	AActor * closest = nullptr;
 	double closestDist = DBL_MAX;
-
-	while(it.Next(&res))
+	
+	for (int i = 0; i < from->Level->PathNodes.Size(); i++)
 	{
-		if(nodeCls->IsAncestorOf(res.thing->GetClass()))
+		AActor* node = from->Level->PathNodes[i];
+		if(node && !(node->flags & MF_AMBUSH) && nodeCls->IsAncestorOf(node->GetClass()))
 		{
-			double dst = res.thing->Distance3D(from);
-			if(dst < closestDist && P_CheckSight(res.thing, from))
+			double dst = node->Distance3DSquared(from);
+			bool mrange = (dst < closestDist && (node->meleerange <= 0.0 || dst < (node->meleerange * node->meleerange)));
+
+			if(mrange && P_CheckSight(node, from))
 			{
 				closestDist = dst;
-				closest = res.thing;
+				closest = node;
 			}
 		}
 	}
@@ -2540,7 +2539,7 @@ static V GetOr(TMap<K, V> map, const K &key, V alt)
 	return k ? *k : alt;
 }
 
-static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>> &path)
+static bool FindPathAStar(AActor* startnode, AActor* goalnode, TArray<TObjPtr<AActor*>> &path)
 {
 
 	TArray<AActor*> openSet;
@@ -2548,9 +2547,9 @@ static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>>
 	TMap<AActor*, double> gScore;
 	TMap<AActor*, double> fScore;
 
-	openSet.Push(start);
-	gScore.Insert(start, 0);
-	fScore.Insert(start, start->Distance3D(goal));
+	openSet.Push(startnode);
+	gScore.Insert(startnode, 0);
+	fScore.Insert(startnode, startnode->Distance3DSquared(goalnode));
 
 	auto lt_fScore = [&fScore](AActor* lhs, AActor* rhs)
 	{
@@ -2561,7 +2560,7 @@ static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>>
 	{
 		AActor * current = openSet[0];
 		openSet.Delete(0);
-		if(current == goal)
+		if(current == goalnode)
 		{
 			ReconstructPath(cameFrom, current, path);
 			return true;
@@ -2572,7 +2571,7 @@ static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>>
 		for(AActor * neighbor : GetPathNodeNeighbors(current))
 		{
 
-			double tentative_gScore = current_gScore + current->Distance3D(neighbor);
+			double tentative_gScore = current_gScore + current->Distance3DSquared(neighbor);
 
 			double neighbor_gScore = GetOr(gScore, neighbor, DBL_MAX);
 
@@ -2581,7 +2580,7 @@ static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>>
 				openSet.SortedDelete(neighbor, lt_fScore);
 				cameFrom.Insert(neighbor, current);
 				gScore.Insert(neighbor, tentative_gScore);
-				fScore.Insert(neighbor, tentative_gScore + neighbor->Distance3D(goal));
+				fScore.Insert(neighbor, tentative_gScore + neighbor->Distance3DSquared(goalnode));
 				openSet.SortedInsert(neighbor, lt_fScore);
 			}
 		}
@@ -2589,20 +2588,19 @@ static bool FindPathAStar(AActor* start, AActor* goal, TArray<TObjPtr<AActor*>>
 	return false;
 }
 
-bool FLevelLocals::FindPath(AActor* start, AActor* goal, AActor* startNode, AActor* goalNode, double maxSearch)
+bool FLevelLocals::FindPath(AActor* chaser, AActor* target, AActor* startNode, AActor* goalNode)
 {
-	static PClass * nodeCls = PClass::FindClass(NAME_PathNode);
-
-	if (!start || !goal)
+	if (!chaser || !target)
 	{
 		return false;
 	}
 
+	static PClass* nodeCls = PClass::FindClass(NAME_PathNode);
 	assert(startNode == nullptr || nodeCls->IsAncestorOf(startNode->GetClass()));
 	assert(goalNode == nullptr || nodeCls->IsAncestorOf(goalNode->GetClass()));
 
-	if(startNode == nullptr) startNode = FindClosestNode(start, maxSearch);
-	if(goalNode == nullptr) goalNode = FindClosestNode(goal, maxSearch);
+	if(startNode == nullptr) startNode = FindClosestNode(chaser);
+	if(goalNode == nullptr) goalNode = FindClosestNode(target);
 
 	// Incomplete graph.
 	if (!startNode || !goalNode)
@@ -2612,16 +2610,16 @@ bool FLevelLocals::FindPath(AActor* start, AActor* goal, AActor* startNode, AAct
 
 	if (startNode == goalNode)
 	{
-		start->ClearPath();
-		start->Path.Push(MakeObjPtr<AActor*>(startNode));
+		chaser->ClearPath();
+		chaser->Path.Push(MakeObjPtr<AActor*>(startNode));
 		return true;
 	}
 	
-	if(FindPathAStar(startNode, goalNode, start->Path))
+	if (FindPathAStar(startNode, goalNode, chaser->Path))
 	{
-		if (start->goal && nodeCls->IsAncestorOf(start->goal->GetClass()))
+		if (chaser->goal && nodeCls->IsAncestorOf(chaser->goal->GetClass()))
 		{
-			start->goal = nullptr;
+			chaser->goal = nullptr;
 		}
 		return true;
 	}
@@ -2636,6 +2634,22 @@ DEFINE_ACTION_FUNCTION(FLevelLocals, FindPath)
 	PARAM_OBJECT(target, AActor);
 	PARAM_OBJECT(startnode, AActor);
 	PARAM_OBJECT(goalnode, AActor);
-	PARAM_FLOAT(maxSearch);
-	return self->FindPath(chaser, target, startnode, goalnode, maxSearch);
+	return self->FindPath(chaser, target, startnode, goalnode);
+}
+
+DEFINE_ACTION_FUNCTION(FLevelLocals, HandlePathNode)
+{
+	PARAM_SELF_STRUCT_PROLOGUE(FLevelLocals);
+	PARAM_OBJECT(node, AActor);
+	PARAM_BOOL(add);
+	if (node)
+	{
+		if (add)
+		{
+			if (self->PathNodes.Find(node) >= self->PathNodes.Size())
+				self->PathNodes.Push(node);
+		}
+		else self->PathNodes.Delete(self->PathNodes.Find(node));
+	}
+	return 0;
 }

src/g_levellocals.h

@@ -444,8 +444,9 @@ public:
 	
 	void SetMusic();
 
-	bool FindPath(AActor *chaser, AActor *target, AActor *startnode = nullptr, AActor *goalnode = nullptr, double maxSearch = 256.0);
+	bool FindPath(AActor *chaser, AActor *target, AActor *startnode = nullptr, AActor *goalnode = nullptr);
 
+	TArray<AActor *> PathNodes;
 	TArray<vertex_t> vertexes;
 	TArray<sector_t> sectors;
 	TArray<extsector_t> extsectors; // container for non-trivial sector information. sector_t must be trivially copyable for *_fakeflat to work as intended.

src/gamedata/g_mapinfo.cpp

@@ -1819,6 +1819,7 @@ MapFlagHandlers[] =
 	{ "disableskyboxao",				MITYPE_CLRFLAG3,	LEVEL3_SKYBOXAO, 0 },
 	{ "avoidmelee",						MITYPE_SETFLAG3,	LEVEL3_AVOIDMELEE, 0 },
 	{ "attenuatelights",				MITYPE_SETFLAG3,	LEVEL3_ATTENUATE, 0 },
+	{ "pathing",						MITYPE_SETFLAG3,	LEVEL3_PATHING, 0 },
 	{ "nobotnodes",						MITYPE_IGNORE,	0, 0 },		// Skulltag option: nobotnodes
 	{ "nopassover",						MITYPE_COMPATFLAG, COMPATF_NO_PASSMOBJ, 0 },
 	{ "passover",						MITYPE_CLRCOMPATFLAG, COMPATF_NO_PASSMOBJ, 0 },

src/gamedata/g_mapinfo.h

@@ -270,6 +270,7 @@ enum ELevelFlags : unsigned int
 	LEVEL3_AVOIDMELEE			= 0x00020000,	// global flag needed for proper MBF support.
 	LEVEL3_NOJUMPDOWN			= 0x00040000,	// only for MBF21. Inverse of MBF's dog_jumping flag.
 	LEVEL3_LIGHTCREATED			= 0x00080000,	// a light had been created in the last frame
+	LEVEL3_PATHING			= 0x00100000,	// enable pathfinding by default
 };
 
 

src/p_setup.cpp

@@ -326,6 +326,7 @@ void FLevelLocals::ClearLevelData(bool fullgc)
 	}
 	ClearPortals();
 
+	PathNodes.Clear();
 	tagManager.Clear();
 	ClearTIDHashes();
 	if (SpotState) SpotState->Destroy();

src/playsim/actor.h

@@ -445,6 +445,7 @@ enum ActorFlag9
 	MF9_DECOUPLEDANIMATIONS		= 0x00000010,	// [RL0] Decouple model animations from states
 	MF9_PATHING					= 0x00000020,	// [MC] Enables monsters to do pathfinding, such as A*.
 	MF9_KEEPPATH				= 0x00000040,	// [MC] Forces monsters to keep to the path when target's in sight.
+	MF9_NOPATHING				= 0x00000080,	// [MC] override the mapinfo "pathfinding"
 };
 
 // --- mobj.renderflags ---
@@ -1104,6 +1105,8 @@ public:
 	void SetDynamicLights();
 
 	void ClearPath();
+	bool CanPathfind();
+	void CallReachedNode(AActor *node);
 
 // info for drawing
 // NOTE: The first member variable *must* be snext.

src/playsim/p_enemy.cpp

@@ -2208,8 +2208,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_ClearLastHeard)
 void AActor::ClearPath()
 {
 	Path.Clear();
-	if (goal && goal->IsKindOf(NAME_PathNode))
-		goal = nullptr;
+	if (goal)
+	{
+		static PClass* nodeCls = PClass::FindClass(NAME_PathNode);
+		if (nodeCls->IsAncestorOf(goal->GetClass()))
+			goal = nullptr;
+	}
 }
 
 DEFINE_ACTION_FUNCTION(AActor, ClearPath)
@@ -2219,6 +2223,42 @@ DEFINE_ACTION_FUNCTION(AActor, ClearPath)
 	return 0;
 }
 
+bool AActor::CanPathfind()
+{
+	if ((!(flags9 & MF9_NOPATHING) && !(Sector->MoreFlags & SECMF_NOPATHING)) &&
+		(flags9 & MF9_PATHING || Level->flags3 & LEVEL3_PATHING))
+	{
+		if ((flags6 & MF6_NOFEAR))
+			return true;
+
+		// Can't pathfind while feared.
+		if (!(flags4 & MF4_FRIGHTENED))
+		{
+			if (!target)	
+				return true;
+
+			if (!target->flags8 & MF8_FRIGHTENING)
+				return (!target->player || !(target->player->cheats & CF_FRIGHTENING));
+		}
+	}
+	return false;
+}
+
+DEFINE_ACTION_FUNCTION(AActor, CanPathfind)
+{
+	PARAM_SELF_PROLOGUE(AActor);
+	return self->CanPathfind();
+}
+
+void AActor::CallReachedNode(AActor *node)
+{
+	IFVIRTUAL(AActor, ReachedNode)
+	{
+		VMValue params[2] = { this, node };
+		VMCall(func, params, 2, nullptr, 0);
+	}
+}
+
 //==========================================================================
 //
 // A_Wander
@@ -2515,30 +2555,8 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 		return;
 	}
 
-	if (actor->target && actor->flags9 & MF9_PATHING)
-	{
-		if (actor->goal && actor->goal->IsKindOf(NAME_PathNode))
-		{
-			AActor* temp = actor->target;
-			actor->target = actor->goal;
-			bool result = P_CheckMeleeRange(actor);
-			actor->target = temp;
-
-			if (result) // TO DO
-			{
-
-			}
-				
-		}
-		if (!actor->goal)
-		{
-			if (actor->Path.Size() < 1 && actor->Level->FindPath(actor, actor->target))
-				actor->goal = actor->Path[0];
-				
-		}
-	}
 	// [RH] Don't attack if just moving toward goal
-	else if (actor->target == actor->goal || (actor->flags5&MF5_CHASEGOAL && actor->goal != nullptr))
+	if (actor->target == actor->goal || (actor->flags5&MF5_CHASEGOAL && actor->goal != nullptr))
 	{
 		AActor * savedtarget = actor->target;
 		actor->target = actor->goal;
@@ -2617,7 +2635,45 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 				}
 			}
 		}
+	}
 
+	if (actor->target && actor->CanPathfind())
+	{
+		if (actor->goal && !(actor->goal->flags & MF_AMBUSH) && actor->goal->IsKindOf(NAME_PathNode))
+		{
+			AActor* temp = actor->target;
+			actor->target = actor->goal;
+			bool reached = (P_CheckMeleeRange(actor));
+			actor->target = temp;
+
+			if (reached)
+			{
+				actor->CallReachedNode(actor->goal);
+				/*
+				AActor* next = nullptr;
+				if (!(actor->flags9 & MF9_KEEPPATH) && 
+					P_CheckSight(actor, actor->target, SF_IGNOREWATERBOUNDARY | SF_IGNOREVISIBILITY))
+					actor->Path.Clear();
+				else
+				{
+					unsigned int index = actor->Path.Find(actor->goal);
+					while (++index < actor->Path.Size() - 1)
+					{
+						next = actor->Path[index];
+						if (next && next != actor->goal)
+							break;
+					}
+					if (!next)	actor->ClearPath();
+					else		actor->goal = next;
+				}
+				*/
+			}
+		}
+		if (!actor->goal)
+		{
+			if (actor->Path.Size() > 0 || actor->Level->FindPath(actor, actor->target))
+				actor->goal = actor->Path[0];
+		}
 	}
 
 	// [RH] Scared monsters attack less frequently
@@ -2670,7 +2726,7 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 			lookForBetter = true;
 		}
 		AActor * oldtarget = actor->target;
-		gotNew = P_LookForPlayers (actor, !(flags & CHF_DONTLOOKALLAROUND), NULL);
+		gotNew = P_LookForPlayers (actor, !(flags & CHF_DONTLOOKALLAROUND), nullptr);
 		if (lookForBetter)
 		{
 			actor->flags3 |= MF3_NOSIGHTCHECK;
@@ -2678,6 +2734,7 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 		if (gotNew && actor->target != oldtarget)
 		{
 			actor->flags7 &= ~MF7_INCHASE;
+			actor->ClearPath();
 			return; 	// got a new target
 		}
 	}

src/playsim/p_map.cpp

@@ -592,7 +592,7 @@ bool	P_TeleportMove(AActor* thing, const DVector3 &pos, bool telefrag, bool modi
 			thing->CheckSectorTransition(oldsec);
 		}
 	}
-
+	thing->CallReachedNode(thing->goal);
 	return true;
 }
 
@@ -2613,6 +2613,7 @@ bool P_TryMove(AActor *thing, const DVector2 &pos,
 				thing->LinkToWorld(&ctx);
 				P_FindFloorCeiling(thing);
 				thing->ClearInterpolation();
+				thing->CallReachedNode(thing->goal);
 				portalcrossed = true;
 				tm.portalstep = false;
 			}

src/scripting/thingdef_data.cpp

@@ -355,6 +355,7 @@ static FFlagDef ActorFlagDefs[]=
 	DEFINE_FLAG(MF9, DECOUPLEDANIMATIONS, AActor, flags9),
 	DEFINE_FLAG(MF9, PATHING, AActor, flags9),
 	DEFINE_FLAG(MF9, KEEPPATH, AActor, flags9),
+	DEFINE_FLAG(MF9, NOPATHING, AActor, flags9),
 
 	// Effect flags
 	DEFINE_FLAG(FX, VISIBILITYPULSE, AActor, effects),

src/scripting/vmthunks.cpp

@@ -2786,6 +2786,7 @@ DEFINE_FIELD_X(LevelInfo, level_info_t, RedirectMapName)
 DEFINE_FIELD_X(LevelInfo, level_info_t, teamdamage)
 
 DEFINE_GLOBAL_NAMED(currentVMLevel, level)
+DEFINE_FIELD(FLevelLocals, PathNodes)
 DEFINE_FIELD(FLevelLocals, sectors)
 DEFINE_FIELD(FLevelLocals, lines)
 DEFINE_FIELD(FLevelLocals, sides)
@@ -2853,6 +2854,7 @@ DEFINE_FIELD_BIT(FLevelLocals, flags2, infinite_flight, LEVEL2_INFINITE_FLIGHT)
 DEFINE_FIELD_BIT(FLevelLocals, flags2, no_dlg_freeze, LEVEL2_CONV_SINGLE_UNFREEZE)
 DEFINE_FIELD_BIT(FLevelLocals, flags2, keepfullinventory, LEVEL2_KEEPFULLINVENTORY)
 DEFINE_FIELD_BIT(FLevelLocals, flags3, removeitems, LEVEL3_REMOVEITEMS)
+DEFINE_FIELD_BIT(FLevelLocals, flags3, pathing, LEVEL3_PATHING)
 
 DEFINE_FIELD_X(Sector, sector_t, floorplane)
 DEFINE_FIELD_X(Sector, sector_t, ceilingplane)

wadsrc/static/mapinfo/common.txt

@@ -44,6 +44,7 @@ DoomEdNums
   5065 = InvisibleBridge8
   9001 = MapSpot
   9013 = MapSpotGravity
+  9022 = PathNode
   9024 = PatrolPoint
   9025 = SecurityCamera
   9026 = Spark
@@ -285,7 +286,6 @@ DoomEdNums
  14163 = MusicChanger, 63
  14164 = MusicChanger, 64
  14165 = MusicChanger
- 14166 = PathNode
  32000 = DoomBuilderCamera
 }
 

wadsrc/static/zscript/actors/actor.zs

@@ -664,7 +664,7 @@ class Actor : Thinker native
 	// called before and after triggering a teleporter
 	// return false in PreTeleport() to cancel the action early
 	virtual bool PreTeleport( Vector3 destpos, double destangle, int flags ) { return true; }
-	virtual void PostTeleport( Vector3 destpos, double destangle, int flags ) {}
+	virtual void PostTeleport( Vector3 destpos, double destangle, int flags ) { }
 	
 	native virtual bool OkayToSwitchTarget(Actor other);
 	native clearscope static class<Actor> GetReplacement(class<Actor> cls);
@@ -706,7 +706,6 @@ class Actor : Thinker native
 	native void ClearFOVInterpolation();
 	native clearscope Vector3 PosRelative(sector sec) const;
 	native void RailAttack(FRailParams p);
-	native void ClearPath();
 		
 	native void HandleSpawnFlags();
 	native void ExplodeMissile(line lin = null, Actor target = null, bool onsky = false);
@@ -798,6 +797,46 @@ class Actor : Thinker native
 		movecount = random[TryWalk](0, 15);
 		return true;
 	}
+
+	native void ClearPath();
+	native clearscope bool CanPathfind() const;
+	virtual void ReachedNode(Actor mo)
+	{
+		if (!mo && !goal) 
+			return;
+		
+		mo = goal;
+		let node = PathNode(mo);
+		if (!node || !target || (!bKEEPPATH && CheckSight(target)))
+		{
+			ClearPath();
+			return;
+		}
+
+		int i = Path.Find(node) + 1;
+		int end = Path.Size();
+		
+		for (i; i < end; i++)
+		{
+			PathNode next = Path[i];
+
+			if (!next || next == node)
+				continue;
+
+			// Monsters will never 'reach' AMBUSH flagged nodes. Instead, the engine
+			// indicates they're reached the moment they tele/portal. 
+
+			if (node.bAMBUSH && next.bAMBUSH)
+				continue;
+
+			goal = next;
+			break;
+		}
+
+		if (i >= end)
+			ClearPath();
+	
+	}
 	
 	native bool TryMove(vector2 newpos, int dropoff, bool missilecheck = false, FCheckPosition tm = null);
 	native bool CheckMove(vector2 newpos, int flags = 0, FCheckPosition tm = null);

wadsrc/static/zscript/actors/shared/sharedmisc.zs

@@ -246,36 +246,34 @@ class SpeakerIcon : Unknown
 	}
 }
 
-//===============================================================
-// Path Nodes
-//===============================================================
+/*
+=================================================================
+Path Nodes
+=================================================================
+Special flags are as follows:
 
+AMBUSH
+	Node is blind. Things cannot "touch" these nodes with A_Chase.
+	Useful for tele/portals since the engine makes them "touch"
+	upon transitioning. These nodes are fast forwarded over in Actor's
+	ReachedNode() function.
+*/
 class PathNode : Actor
 {
-	// For non-connected paths. Stamina will be used to set this. Necessary for tele/portals.
-	private int group; 
-
 	Array<PathNode> neighbors;
 	
 	Default
 	{
-		//$Arg0 "TID 1"
-		//$Arg1 "TID 2"
-		//$Arg2 "TID 3"
-		//$Arg3 "TID 4"
-		//$Arg4 "TID 5"
-		//$Arg0Type 14
-		//$Arg1Type 14
-		//$Arg2Type 14
-		//$Arg3Type 14
-		//$Arg4Type 14
+		+NOINTERACTION
 		+NOBLOCKMAP
 		+INVISIBLE
 		+DONTSPLASH
 		+NOTONAUTOMAP
-		+NOGRAVITY // TO DO: Look into 3D variant for traversing up and down 3D floors and floating monsters.
+		+NOGRAVITY
+		Radius 16;
+		Height 56;
 		RenderStyle "None";
-		MeleeRange 2048; // Sight checks limited to this. 0 = infinite.
+		MeleeRange 0; // Sight checks limited to this. 0 = infinite. Set within map editor.
 	}
 	
 	// Args are TIDs. Can be one way to force single directions.
@@ -295,6 +293,13 @@ class PathNode : Actor
 			} while (node = PathNode(it.Next()))
 			
 		}
+		level.HandlePathNode(self, true);
+	}
+
+	override void OnDestroy()
+	{
+		level.HandlePathNode(self, false);
+		Super.OnDestroy();
 	}
 
 	// For ACS access with ScriptCall.

wadsrc/static/zscript/doombase.zs

@@ -408,7 +408,7 @@ struct LevelLocals native
 	
 	const CLUSTER_HUB = 0x00000001;	// Cluster uses hub behavior
 
-
+	native readonly Array<PathNode> PathNodes;
 	native Array<@Sector> Sectors;
 	native Array<@Line> Lines;
 	native Array<@Side> Sides;
@@ -476,6 +476,7 @@ struct LevelLocals native
 	native readonly int compatflags;
 	native readonly int compatflags2;
 	native readonly LevelInfo info;
+	native readonly bool pathing;
 
 	native String GetUDMFString(int type, int index, Name key);
 	native int GetUDMFInt(int type, int index, Name key);
@@ -554,7 +555,8 @@ struct LevelLocals native
 	native void SpawnParticle(FSpawnParticleParams p);
 	native VisualThinker SpawnVisualThinker(Class<VisualThinker> type);
 
-	native bool FindPath(Actor chaser, Actor target, Actor startnode = null, Actor goalnode = null, double maxSearch = 256.0);
+	native bool FindPath(Actor chaser, Actor target, PathNode startnode = null, PathNode goalnode = null);
+	native void HandlePathNode(PathNode node, bool add);
 }
 
 // a few values of this need to be readable by the play code.