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Including Engine Header Error (Recast.h)

Hi together,

I want to process data from Recast in a Actor Subclass. In detail i want to process rcCompactHeightfield Data. So i tried to include Recast.h and it is found though my class won`t compile. How could i possibly circumvent this problem?

Actor Header:

 #pragma once
 #include "GameFramework/Actor.h"
 #include "Runtime/Navmesh/Public/Recast/Recast.h"
 #include "Runtime/Navmesh/Public/Recast/RecastAlloc.h"
 #include "Runtime/Navmesh/Public/Recast/RecastAssert.h"
 #include "MyProcessor.generated.h"
 class MYPROJECT_API AMyProcessor : public AActor
     // Sets default values for this actor's properties
     // Called when the game starts or when spawned
     virtual void BeginPlay() override;
     virtual void PostLoad() override;
     // Called every frame
     virtual void Tick( float DeltaSeconds ) override;
     void Process(rcCompactHeightfield& RasterContext);

Actor cpp:

 #include "MyProject.h"
 #include "MyProcessor.h"
 // Sets default values
      // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
     PrimaryActorTick.bCanEverTick = true;
 // Called when the game starts or when spawned
 void AMyProcessor::BeginPlay()
     UE_LOG(LogTemp, Warning, TEXT("MyProcessor spawned"));
 void AMyProcessor::PostLoad()
     UE_LOG(LogTemp, Warning, TEXT("MyProcessor loaded"));
 // Called every frame
 void AMyProcessor::Tick( float DeltaTime )
     Super::Tick( DeltaTime );
 void Process(rcCompactHeightfield& RasterContext)


 Info /Users/leonardodapisa/Desktop/fork/UnrealEngine/Engine/Source/Runtime/Navmesh/Public/Recast/Recast.h:108:1: error: expected expression
 Info public:
 Info ^
 Info /Users/leonardodapisa/Desktop/fork/UnrealEngine/Engine/Source/Runtime/Navmesh/Public/Recast/Recast.h:106:19: error: variable has incomplete type 'class NAVMESH_API'
 Info class NAVMESH_API rcContext
 Info           ^

Obviously he has problem with the "NAVMESH_API" and so do i since i don`t understand at the moment where it is coming from.

Thanks in advance, alex

Product Version: UE 4.8
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asked Aug 12 '15 at 01:34 PM in C++ Programming

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Hello, avision

I am sorry to hear about your problem.

Please note that usage of some Unreal Engine 4 classes requires extra modules that may not be added to your project by default.

In this situation, it is most likely that the problem occurs because "Navmesh" module is not included. Thus, please open Build.cs file of your game (ProjectName/Source/ProjectName/ProjectName.Build.cs) and add Navmesh to the list of included modules:

  PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "Navmesh"});

In general, when you are going to use a class in your project for the first time, it is a good practise to check what module is class implemented in, and see if it is included in your project. To find a module, please go to class declaration (header file) or use online documentation (https://docs.unrealengine.com). At the bottom of the page, there is a "References" section, where you can obtain information about headers and modules that should be used: alt text

Hope this helped! Have a great day!

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answered Aug 17 '15 at 08:38 AM

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Andrii Melnyk
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avatar image avision Aug 19 '15 at 12:46 PM

Thanks a lot. This was indeed the problem. I thought it should be in cause the top-down example includes a NavMesh. But i overlooked that the project and the engine are in fact two builds.

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