Engine inner working

Wander Operation

 WanderOperation::Run()
    CalculateEdgeList()
         FindNearestWaypoint() finds start point
         GetActiveLocate() finds end point
         FindEdgeRoute() finds the route between start and end
    dest = GetNextPathPoint() gets the next path point (not the current one) and returns it
    StartMoveTo(dest) 
    

NPC Brain

 APlaneShiftGameState::BeginPlay()
  calls psNPCManager::Initialize()
      calls ReadNPCsFromDatabase()
         select * from sc_npc_definitions
         populates npcs TMap
    
 spawnManager->RepopulateLive();
   LoadAllNPCCharacterData
      SELECT characters.* where npc_spawn_rule>0
           char = SpawnActor()
           char->Load()
               if (IsNPC()) psAIController->SetBrain( using npcs TMap above)

When a perception happens it goes through:

  psNPCManager::TriggerEvent()
    checks all reactions with this event and it finds also the brains without pawn associated, so I added a check there to skip

Main engine loop on startup

	MyProjectServer.exe!UIpNetDriver::InitListen(FNetworkNotify * InNotify, FURL & LocalURL, bool bReuseAddressAndPort, FString & Error) Line 152	C++
	MyProjectServer.exe!UWorld::Listen(FURL & InURL) Line 3927	C++
	MyProjectServer.exe!UEngine::LoadMap(FWorldContext & WorldContext, FURL URL, UPendingNetGame * Pending, FString & Error) Line 8983	C++
	MyProjectServer.exe!UEngine::Browse(FWorldContext & WorldContext, FURL URL, FString & Error) Line 8144	C++
	MyProjectServer.exe!UGameInstance::StartGameInstance() Line 262	C++
	MyProjectServer.exe!UGameEngine::Init(IEngineLoop * InEngineLoop) Line 465	C++
	MyProjectServer.exe!FEngineLoop::Init() Line 1967	C++
	MyProjectServer.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 138	C++
	MyProjectServer.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 191	C++

Open level command

When you execute the "open" command from console, it will queue the travel to open the map:

	MyProject2.exe!UGameInstance::HandleOpenCommand(const wchar_t * Cmd, FOutputDevice & Ar, UWorld * InWorld) Line 295	C++
	MyProject2.exe!UGameInstance::Exec(UWorld * InWorld, const wchar_t * Cmd, FOutputDevice & Ar) Line 323	C++
	MyProject2.exe!UGameViewportClient::Exec(UWorld * InWorld, const wchar_t * Cmd, FOutputDevice & Ar) Line 2014	C++
	MyProject2.exe!ULocalPlayer::Exec(UWorld * InWorld, const wchar_t * Cmd, FOutputDevice & Ar) Line 1457	C++
	MyProject2.exe!APlayerController::ConsoleCommand(const FString & Cmd, bool bWriteToLog) Line 350	C++
	MyProject2.exe!UConsole::ConsoleCommand(const FString & Command) Line 394	C++
	MyProject2.exe!UConsole::InputKey_InputLine(int ControllerId, FKey Key, EInputEvent Event, float AmountDepressed, bool bGamepad) Line 651	C++
	MyProject2.exe!UConsole::InputKey(int ControllerId, FKey Key, EInputEvent Event, float AmountDepressed, bool bGamepad) Line 1062	C++
	MyProject2.exe!UGameViewportClient::InputKey(FViewport * InViewport, int ControllerId, FKey Key, EInputEvent EventType, float AmountDepressed, bool bGamepad) Line 265	C++

Then at the next tick it will do this:

	MyProject2.exe!UEngine::Browse(FWorldContext & WorldContext, FURL URL, FString & Error) Line 8161	C++
	MyProject2.exe!UEngine::TickWorldTravel(FWorldContext & Context, float DeltaSeconds) Line 8311	C++
	MyProject2.exe!UGameEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 812	C++
	MyProject2.exe!FEngineLoop::Tick() Line 2257	C++
	MyProject2.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 142	C++

Collision Tests

 Inside ApsItemActor::ApsItemActor()
   no special code

 Character collides with items

  Inside ApsItemActor::ApsItemActor()
   mesh->SetCollisionProfileName("NoCollision");
   mesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);

  Character does not collide with items

  Inside EntityManager::CreateItem() after SpawnActor
   mesh->SetCollisionProfileName("NoCollision");
   mesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);

  Character collides with items (code seems to have no effect)

Quest interaction sequence

When the player is clicking on the talk icon , this happens, and sends back to the client all the possible quest options:

 APlaneshiftPlayerControllerBase::TalkInteraction()
    ApsCharacter::ShowPopupMenu
       NpcDialogMenu::ShowMenu
          eventManager->SendDialogMenuMessageDelayed

When the player is selecting one option in the npc bubble menu, he sends a chat message to the NPC

  APlaneshiftPlayerControllerBase::SendChatMessage
    ChatManager::HandleChatMessage with type CHAT_NPC
      NpcResponse::ExecuteScript (based on the response found, we execute the script, which may include a number of steps, like say something, do an animation, etc...)