Add AI Goal system, FollowLeader goal.

+ Add support for setting leader, e.g. Misty follows you during "Luigi's Girls".

rwengine/include/ai/CharacterController.hpp

@@ -27,6 +27,21 @@ public:
 
 		virtual bool update(CharacterObject* character, CharacterController* controller) = 0;
 	};
+	
+	/**
+	 * Available AI goals.
+	 */
+	enum Goal
+	{
+		/**
+		 * No goal, will idle or execute external Activities.
+		 */
+		None,
+		/**
+		 * Keep close to leader character
+		 */
+		FollowLeader
+	};
 
 protected:
 	
@@ -44,6 +59,10 @@ protected:
 	glm::vec3 rawMovement;
 
 	bool running;
+	
+	// Goal related variables
+	Goal currentGoal;
+	CharacterObject* leader;
 
 public:
 	
@@ -90,6 +109,12 @@ public:
 	void setRawMovement(const glm::vec3& movement);
 
 	void setRunning(bool run);
+	
+	void setGoal(Goal goal) { currentGoal = goal; }
+	Goal getGoal() const { return currentGoal; }
+	
+	void setTargetCharacter(CharacterObject* c) { leader = c; }
+	CharacterObject* getTargetCharacter() const { return leader; }
 };
 
 #define DECL_ACTIVITY( activity_name ) \

rwengine/include/ai/DefaultAIController.hpp

@@ -7,12 +7,15 @@
 struct AIGraphNode;
 class DefaultAIController : public CharacterController
 {
+	glm::vec3 gotoPos;
 public:
 	
 	DefaultAIController(CharacterObject* character)
 	 : CharacterController(character) {}
 
 	glm::vec3 getTargetPosition();
+	
+    virtual void update(float dt);
 };
 
 #endif

rwengine/src/ai/CharacterController.cpp

@@ -24,7 +24,8 @@ void CharacterController::setActivity(CharacterController::Activity* activity)
 }
 
 CharacterController::CharacterController(CharacterObject* character)
-: character(character), _currentActivity(nullptr), _nextActivity(nullptr), running(false)
+: character(character), _currentActivity(nullptr), _nextActivity(nullptr), running(false),
+currentGoal(None), leader(nullptr)
 {
 	character->controller = this;
 }
@@ -127,6 +128,9 @@ void CharacterController::update(float dt)
 			}
 		}
 	}
+	
+	// Reset raw movement between activity updates.
+	setRawMovement(glm::vec3());
 
 	if( updateActivity() ) {
 		if( _currentActivity ) {

rwengine/src/ai/DefaultAIController.cpp

@@ -14,3 +14,49 @@ glm::vec3 DefaultAIController::getTargetPosition()
 	}*/
 	return glm::vec3();
 }
+
+const float followRadius = 5.f;
+
+void DefaultAIController::update(float dt)
+{
+	switch(currentGoal)
+	{
+		case FollowLeader:
+		{
+			if( ! leader ) break;
+			if( getCharacter()->getCurrentVehicle() )
+			{
+				if( leader->getCurrentVehicle() != getCharacter()->getCurrentVehicle() )
+				{
+					skipActivity();
+					setNextActivity(new Activities::ExitVehicle);
+				}
+				// else we're already in the right spot.
+			}
+			else
+			{
+				if( leader->getCurrentVehicle() )
+				{
+					setNextActivity(new Activities::EnterVehicle(leader->getCurrentVehicle(), 1));
+				}
+				else
+				{
+					glm::vec3 dir = leader->getPosition() - getCharacter()->getPosition();
+					if( glm::length(dir) > followRadius )
+					{
+						if( glm::distance(gotoPos, leader->getPosition()) > followRadius )
+						{
+							gotoPos = leader->getPosition() + ( glm::normalize(-dir) * followRadius * 0.7f );
+							skipActivity();
+							setNextActivity(new Activities::GoTo(gotoPos));
+						}
+					}
+				}
+			}
+		}
+		break;
+		default: break;
+	}
+	
+	CharacterController::update(dt);
+}

rwengine/src/objects/CharacterObject.cpp

@@ -81,7 +81,7 @@ void CharacterObject::createActor(const glm::vec3& size)
 		physShape = new btCapsuleShapeZ(size.x, size.z);
 		physObject->setCollisionShape(physShape);
 		physObject->setCollisionFlags(btCollisionObject::CF_KINEMATIC_OBJECT);
-		physCharacter = new btKinematicCharacterController(physObject, physShape, 0.2f, 2);
+		physCharacter = new btKinematicCharacterController(physObject, physShape, 0.1f, 2);
 		physCharacter->setVelocityForTimeInterval(btVector3(1.f, 1.f, 0.f), 1.f);
 		physCharacter->setGravity(engine->dynamicsWorld->getGravity().length());
 		physCharacter->setJumpSpeed(5.f);

rwengine/src/script/modules/ObjectModule.cpp

@@ -572,6 +572,15 @@ void game_character_exit_vehicle(const ScriptArguments& args)
 	}
 }
 
+void game_character_follow_character(const ScriptArguments& args)
+{
+	auto controller = (CharacterController*)(*args[0].handle);
+	auto leader = (CharacterController*)(*args[1].handle);
+	
+	controller->setGoal(CharacterController::FollowLeader);
+	controller->setTargetCharacter(leader->getCharacter());
+}
+
 void game_navigate_on_foot(const ScriptArguments& args)
 {
 	auto controller = (CharacterController*)(*args[0].handle);
@@ -867,7 +876,7 @@ ObjectModule::ObjectModule()
 	bindFunction(0x01D4, game_enter_as_passenger, 2, "Character Enter Vehicle as Passenger" );
 	bindFunction(0x01D3, game_character_exit_vehicle, 2, "Character Exit Vehicle" );
 	
-	bindUnimplemented( 0x01DF, game_character_follow_character, 2, "Make Character Follow Character" );
+	bindFunction(0x01DF, game_character_follow_character, 2, "Make Character Follow Character");
 	
 	bindFunction(0x01F3, game_vehicle_in_air, 1, "Is Vehicle In Air" );
 	bindFunction(0x01F4, game_vehicle_flipped, 1, "Is Car Flipped" );

rwgame/debugstate.cpp

@@ -78,6 +78,14 @@ DebugState::DebugState(RWGame* game, const glm::vec3& vp, const glm::quat& vd)
 	m->addEntry(Menu::lambda("Jump to Hospital", [=] {
 		jumpCharacter(game, game->getWorld()->state.player, glm::vec3(1123.77, -569.15, 100.0));
 	}, entryHeight));
+	m->addEntry(Menu::lambda("Add Follower", [=] {
+		auto spawnPos = game->getWorld()->state.player->getCharacter()->getPosition();
+		spawnPos += game->getWorld()->state.player->getCharacter()->getRotation() * glm::vec3(-1.f, 0.f, 0.f);
+		auto follower = game->getWorld()->createPedestrian(12, spawnPos);
+		jumpCharacter(game, follower->controller, spawnPos);
+		follower->controller->setGoal(CharacterController::FollowLeader);
+		follower->controller->setTargetCharacter(game->getWorld()->state.player->getCharacter());
+	}, entryHeight));
 
 	this->enterMenu(m);