GameFramework | game framework, based on Unity game engine | Game Engine library

by EllanJiang C# Version: Current License: MIT

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kandi X-RAY | GameFramework Summary

GameFramework is a C# library typically used in Institutions, Learning, Administration, Public Services, Gaming, Game Engine, Unity applications. GameFramework has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Game Framework is literally a game framework, based on Unity game engine. It encapsulates commonly used game modules during development, and, to a large degree, standardises the process, enhances the development speed and ensures the product quality. Game Framework provides the following 19 builtin modules, and more will be developed later for game developers to use.

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GameFramework has a medium active ecosystem.
It has 2833 star(s) with 859 fork(s). There are 234 watchers for this library.
It had no major release in the last 12 months.
There are 0 open issues and 25 have been closed. On average issues are closed in 59 days. There are no pull requests.
It has a neutral sentiment in the developer community.
The latest version of GameFramework is current.

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quality kandi Quality

GameFramework has 0 bugs and 0 code smells.

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GameFramework has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
GameFramework code analysis shows 0 unresolved vulnerabilities.
There are 0 security hotspots that need review.

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license License

GameFramework is licensed under the MIT License. This license is Permissive.
Permissive licenses have the least restrictions, and you can use them in most projects.

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GameFramework Key Features

Config - saves some global read-only game configurations, such as the player's initial speed, the initial volume of the game, etc.

Data Node - saves arbitrary types of data within tree structures in order to manage various data during game runtime.

Data Table - is intended to invoke game data in the form of pre-configured tables (such as Microsoft Excel sheets). The format of the tables can be customised.

Debugger - displays a debugger window when the game runs in the Unity Editor or in a development build, to facilitate the viewing of runtime logs and debug messages. The user can register their own features to the debugger windows and use them conveniently.

Download - provides the ability to download files. The user is free to set how many downloaders could be used simultaneously.

Entity - provides the ability to manage entities and groups of entities, where an entity is defined as any dynamically created objects in the game scene. It shows or hides entities, attach one entity to another (such as weapons, horses or snatching up another entity). Entities could avoid being destroyed instantly after use, and hence be recycled for reuse.

Event - gives the mechanism for the game logic to fire or observe events. Many modules in the Game Framework fires events after operations, and observing these events will largely decouple game logic modules. The user can define his own game logic events, too.

File System - the virtual file system, based on the concept of disks, manages scattered files in a centralized way, optimizes memory allocation when resources are loaded, and can even load segments of resources. These will drastically enhance the performance of resource loading.

FSM - provides the ability to create, use and destroy finite state machines. It’d be a good choice to use this module for some state-machine-like game logic.

Localization - provides the ability to localise the game. Game Framework not only supports the localisation of texts, but also assets of all kinds. For example, a firework effect in the game can be localised as various versions, so that the player will see a "新年好" - like effect in the Chinese version, while "Happy New Year" - like in the English version.

Network - provides socket connections where TCP is currently supported and both IPv4 and IPv6 are valid. The user can establish several connections to different servers at the same time. For example, the user can connect to a normal game server, and another server for voice chat. The 'Packet' class is ready for inheritance and implemented if the user wants to take use of protocol libraries such as ProtoBuf.

Object Pool - provides the ability to cache objects in pools. It avoids frequent creation and destruction operations of game objects, and hence improves the game performance. Game Framework itself uses object pools, and the user could conveniently create and manage his own pools.

Procedure - is in fact an FSM of the whole lifecycle of the game. It’d be a very good habit to decouple different game states via procedures. For a network game, you probably need procedures of checking resources, updating resources, checking the server list, selecting a server, logging in a server and creating avatars. For a standalone game, you perhaps need to switch between procedures of the menu and the real gameplay. The user could add procedures by simply subclassing and implementing the 'ProcedureBase' class.

Resource - provides only asynchronous interfaces to load resources. We don’t recommend synchronous approaches for better play experience, and Game Framework itself uses a complete system of asynchronous resource loading. We load everything asynchronously, including simple things like data tables and localisation texts, and complex things like entities, scenes and UIs. Meanwhile, Game Framework provides default strategies of memory management (and of course, you could define your own strategies). In most cases, you don't even need to call 'Instantiate' or 'Destroy' when using 'GameObject' instances.

Scene - provides features to manage scenes. It supports simultaneous loading of multiple scenes, and the user is allowed to unload a scene at any time. Therefore partial loading/unloading of scenes could be easily implemented.

Setting - stores player data in key-value pairs by either encapsulating UnityEngine.PlayerPrefs or by saving the data directly to the disk.

Sound - provides features to manage sounds and groups of sounds. The user could set the properties of an audio clip, such as the volume, whether the clip is 2D or 3D, and could even bind the clip to some entity to follow its position.

UI - provides features to manage user interfaces and groups of UIs, such as showing or hiding, activating or deactivating, and depth changing. No matter the user uses the builtin uGUI in Unity or other UI plugins (NGUI, for example), he only needs to subclass 'UIFormLogic' and implement his own UI logic. The UIs could avoid being destroyed instantly after use, and hence be recycled for reuse.

Web Request - provides features of short connections, supports GET and POST methods to send requests to the server and acquire the response data, and allows the user to send simultaneous requests to different servers.

GameFramework Examples and Code Snippets

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how to make a collision of an actor on a character in C++ UE4?

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//.h

    UFUNCTION()
    void Power();

    UFUNCTION()
    void ResetPower();

    bool bIsPower = false;
//.cpp

void AItem::ResetPower()
{
    player->GetMesh()->SetRelativeScale3D(FVector(1.f,1.f,1.f));
}

//.cpp

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && bIsPower)
   {
       player = Cast<AProjet2Character>(OtherActor);
       bIsPower = false;
       ResetPower();
   }
}

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   //Clear
}

-----------------------

//.h

    UFUNCTION()
    void Power();

    UFUNCTION()
    void ResetPower();

    bool bIsPower = false;
//.cpp

void AItem::ResetPower()
{
    player->GetMesh()->SetRelativeScale3D(FVector(1.f,1.f,1.f));
}

//.cpp

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && bIsPower)
   {
       player = Cast<AProjet2Character>(OtherActor);
       bIsPower = false;
       ResetPower();
   }
}

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   //Clear
}

-----------------------

//.h

    UFUNCTION()
    void Power();

    UFUNCTION()
    void ResetPower();

    bool bIsPower = false;
//.cpp

void AItem::ResetPower()
{
    player->GetMesh()->SetRelativeScale3D(FVector(1.f,1.f,1.f));
}

//.cpp

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && bIsPower)
   {
       player = Cast<AProjet2Character>(OtherActor);
       bIsPower = false;
       ResetPower();
   }
}

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   //Clear
}

Why is a function parameter behaving like a variable declaration?

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UCLASS()
class BLACKJACK_API APlaying_Card : public AActor
{
...
public: 
    ...
    APlaying_Card(int rank, Suit suit);
    ...
};

APlaying_Card::APlaying_Card(int rank, Suit suit) :
    rank(rank), suit(suit) // <-- no ambiguity here! 
{
    ...

    if (rank == 1)
    {
        value = rank; //todo: find a way to make Ace 1 or 11.
        faceStr = "Ace";
    }
    else if (rank <= 10)
    {
        value = rank;
        faceStr = FString::FromInt(rank);
    }
    else if (rank == 11)
    {
        value = 10;
        faceStr = "Jack";
    }
    else if (rank == 12)
    {
        value = 10;
        faceStr = "Queen";
    }
    else if (rank == 13)
    {
        value = 10;
        faceStr = "King";
    }
}

-----------------------

UCLASS()
class BLACKJACK_API APlaying_Card : public AActor
{
...
public: 
    ...
    APlaying_Card(int rank, Suit suit);
    ...
};

APlaying_Card::APlaying_Card(int rank, Suit suit) :
    rank(rank), suit(suit) // <-- no ambiguity here! 
{
    ...

    if (rank == 1)
    {
        value = rank; //todo: find a way to make Ace 1 or 11.
        faceStr = "Ace";
    }
    else if (rank <= 10)
    {
        value = rank;
        faceStr = FString::FromInt(rank);
    }
    else if (rank == 11)
    {
        value = 10;
        faceStr = "Jack";
    }
    else if (rank == 12)
    {
        value = 10;
        faceStr = "Queen";
    }
    else if (rank == 13)
    {
        value = 10;
        faceStr = "King";
    }
}

OnComponentBeginOverlap.AddDynamic says no instance of the function template matches the argument list?

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 void (_cdecl AAICharacter::*)(                      AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)
 void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

UFUNCTION()
void OnBoxOverlapWrapper(UPrimitiveComponent* /*ignored*/, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherIndex, bool bFromSweep, const FHitResult & SweepResult)
{
    OnBoxOverlap(OtherActor, OtherComp, OtherIndex, bFromSweep, SweepResult);
}

-----------------------

 void (_cdecl AAICharacter::*)(                      AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)
 void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

UFUNCTION()
void OnBoxOverlapWrapper(UPrimitiveComponent* /*ignored*/, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherIndex, bool bFromSweep, const FHitResult & SweepResult)
{
    OnBoxOverlap(OtherActor, OtherComp, OtherIndex, bFromSweep, SweepResult);
}

UE4: Actor disappears after play is hit

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AMyActor::AMyActor()
{
    ...
    Root = CreateDefaultSubobject<USceneComponent>(TEXT("Root"));
    RootComponent = Root;

    Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    Mesh->AttachTo(Root);

    ...
}

public: 
    ...

    UPROPERTY()
        USceneComponent* Root;

    UPROPERTY(EditAnywhere)
        UStaticMeshComponent* Mesh;
    ...

-----------------------

AMyActor::AMyActor()
{
    ...
    Root = CreateDefaultSubobject<USceneComponent>(TEXT("Root"));
    RootComponent = Root;

    Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    Mesh->AttachTo(Root);

    ...
}

public: 
    ...

    UPROPERTY()
        USceneComponent* Root;

    UPROPERTY(EditAnywhere)
        UStaticMeshComponent* Mesh;
    ...

Pointer related UE4 crash. Where are my pointers wrong?

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ALTPlayer::ALTPlayer()
    : WeaponClass(ALTWeapon::StaticClass())
{
}

//~ Begin AActor Interface
virtual void PreInitializeComponents() override;
//~ End AActor Interface

void ALTPlayer::PreInitializeComponents()
{
    Super::PreInitializeComponents();

    // Fallback to default Weapon class if none was specified.
    if (WeaponClass == nullptr)
    {
        UE_LOG(LogGameMode, Warning, TEXT("No WeaponClass was specified in %s (%s)"), *GetName(), *GetClass()->GetName());
        WeaponClass = ALTWeapon::StaticClass();
    }
}

-----------------------

ALTPlayer::ALTPlayer()
    : WeaponClass(ALTWeapon::StaticClass())
{
}

//~ Begin AActor Interface
virtual void PreInitializeComponents() override;
//~ End AActor Interface

void ALTPlayer::PreInitializeComponents()
{
    Super::PreInitializeComponents();

    // Fallback to default Weapon class if none was specified.
    if (WeaponClass == nullptr)
    {
        UE_LOG(LogGameMode, Warning, TEXT("No WeaponClass was specified in %s (%s)"), *GetName(), *GetClass()->GetName());
        WeaponClass = ALTWeapon::StaticClass();
    }
}

-----------------------

ALTPlayer::ALTPlayer()
    : WeaponClass(ALTWeapon::StaticClass())
{
}

//~ Begin AActor Interface
virtual void PreInitializeComponents() override;
//~ End AActor Interface

void ALTPlayer::PreInitializeComponents()
{
    Super::PreInitializeComponents();

    // Fallback to default Weapon class if none was specified.
    if (WeaponClass == nullptr)
    {
        UE_LOG(LogGameMode, Warning, TEXT("No WeaponClass was specified in %s (%s)"), *GetName(), *GetClass()->GetName());
        WeaponClass = ALTWeapon::StaticClass();
    }
}

TSubclassOf<> isn't storing the class type

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UPROPERTY(EditDefaultsOnly, Category = "Setup")
TSubclassOf<class ALaserTagLaser> LaserClass;

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Community Discussions

Trending Discussions on GameFramework

how to make a collision of an actor on a character in C++ UE4?
Unreal Engine 5 crashing after using SetupAttachment function
Why is a function parameter behaving like a variable declaration?
The createdefaultsubobject function does not work for UWidgetComponent[UE4.26.2]
Pointer to incomplete class type is not allowed Unreal Engine 4.26
How to fix the UClass has no member "WeaponMesh" error?
How To Detect If An Actor Is Hit In Unreal Engine C++?
OnComponentBeginOverlap.AddDynamic says no instance of the function template matches the argument list?
UE4: Actor disappears after play is hit
Pointer related UE4 crash. Where are my pointers wrong?

Trending Discussions on GameFramework

QUESTION

how to make a collision of an actor on a character in C++ UE4?

Asked 2022-Jan-12 at 15:32

I’m looking to make items that contain powers on unreal engine in c++ like :

When the player steps on it, he wins the Mushroom effect:

It has a scale of 1.25x.

So I create my Actor Item which contains the beginoverlap and the power function : Item.h

#pragma once

#include "CoreMinimal.h"
#include "Components/CapsuleComponent.h"
#include "Components/SphereComponent.h"
#include "GameFramework/Actor.h"
#include "Components/StaticMeshComponent.h"
#include "GameFramework/PlayerController.h"
#include "Character/Projet2Character.h"
#include "Item.generated.h"

UCLASS()
class PROJET2_API AItem : public AActor
{
    GENERATED_BODY()
    
public: 
    // Sets default values for this actor's properties
    AItem();
protected:

    UPROPERTY(EditAnywhere)
    USphereComponent* Collider;

    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public:

    UFUNCTION()
    void OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

    UFUNCTION()
    void OnEndOverlap(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex);
    
    UFUNCTION()
    void Power();

   AProjet2Character* player;

    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

Item.cpp

#include "Actor/Item.h"


// Sets default values
AItem::AItem()
{
   // 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;
   
   Mesh = CreateDefaultSubobject<UStaticMeshComponent>(FName("Mesh"));
   Mesh->SetupAttachment(RootComponent);
   RootComponent = Mesh;
   
   Collider = CreateDefaultSubobject<USphereComponent>(FName("Collider"));
   Collider->SetupAttachment(Mesh);

}

// Called when the game starts or when spawned
void AItem::BeginPlay()
{
   Super::BeginPlay();
   Collider->OnComponentBeginOverlap.AddDynamic(this, &AItem::OnBeginOverlap);
   Collider->OnComponentEndOverlap.AddDynamic(this, &AItem::OnEndOverlap);
   
}

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()))
   {
     Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()))
   {
       Power();
   }
}

void AItem::Power()
{
player->GetMesh()->SetRelativeScale3D(FVector(1.5f,1.5f,1.5f));
}

// Called every frame
void AItem::Tick(float DeltaTime)
{
   Super::Tick(DeltaTime);
}

When I launch the game at the moment I come into contact with the actor, unreal closes and the effect still does not apply to the character. I want to know how to do it? :)

Thank you for your understanding

ANSWER

Answered 2022-Jan-12 at 15:32

I didnt quite understand. Do you want the player to step on the object and increase in size and then, when he leaves the object, return it to its original size (1) or keep the size (2)?

//.h

    UFUNCTION()
    void Power();

    UFUNCTION()
    void ResetPower();

    bool bIsPower = false;
//.cpp

void AItem::ResetPower()
{
    player->GetMesh()->SetRelativeScale3D(FVector(1.f,1.f,1.f));
}

//.cpp

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && bIsPower)
   {
       player = Cast<AProjet2Character>(OtherActor);
       bIsPower = false;
       ResetPower();
   }
}

void AItem::OnBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
   if(OtherActor->IsA(AProjet2Character::StaticClass()) && !bIsPower)
   {
      player = Cast<AProjet2Character>(OtherActor);
        bIsPower = true;
        Power();
   }
}

void AItem::OnEndOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp,
   int32 OtherBodyIndex)
{
   //Clear
}

Source https://stackoverflow.com/questions/70676414

QUESTION

Unreal Engine 5 crashing after using SetupAttachment function

Asked 2021-Oct-06 at 12:29

I've created new poject and added new c++ class, but after using SetupAttachment UE has an error. I've tryed to fix it and found a probem. For now i don't know, in what problem, i actualy know the place. UE5 window after building

Code:

Header:

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "TankController.generated.h"

class USpringArmComponent;
class UCameraComponent;

UCLASS()
class TANKS_API ATankController : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    ATankController();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

    //DEFINTE COMPONENTS //

    // Do a Hull of the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Hull;

    // Wheels for the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Wheel1;
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Wheel2;

    //Tower of the Tank
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Turret;
  
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* Barrel;

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UStaticMeshComponent* RecoilSystem;

    // Camera Components

    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    USpringArmComponent* SpringArm;
  
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components")
    UCameraComponent* Camera;

public: 

    // Called to bind functionality to input
    virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

};

And cpp:

// Fill out your copyright notice in the Description page of Project Settings.


#include "TankController.h"

#include "GameFramework/SpringArmComponent.h"

// Sets default values
ATankController::ATankController()
{
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = false;

    // Set Root Component to ours Hull
    RootComponent = Hull;

    // Attach Wheels to the Hull
    // Here i have an error
    SpringArm->SetupAttachment(Hull);

}

// Called when the game starts or when spawned
void ATankController::BeginPlay()
{
    Super::BeginPlay();
    
}

// Called to bind functionality to input
void ATankController::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

}

How to fix this errror? Is it mine mistake, or UE bug?

ANSWER

Answered 2021-Oct-06 at 12:20

It’s your mistake. You’re never initializing SpringArm, and even if it were set in your actor instance (or through a blueprint or subclass), it wouldn’t be available during the constructor (and would still crash when constructing the CDO).

Source https://stackoverflow.com/questions/69465479

QUESTION

Why is a function parameter behaving like a variable declaration?

Asked 2021-Aug-29 at 02:33

I am using Unreal and ran into some weird errors. I eventually found that simply renaming my function parameters fixed the problem. Here is the full header and class. The problem is the InitCard function:



#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/StaticMeshComponent.h"
#include "Playing_Card.generated.h"

UCLASS()
class BLACKJACK_API APlaying_Card : public AActor
{
    GENERATED_BODY()

    
public: 
    enum Suit { HEARTS = 0, DIAMONDS = 1, CLUBS = 2, SPADES = 3, UNASSIGNED = 4 };
    Suit suit = Suit::UNASSIGNED;

    // Sets default values for this actor's properties
    APlaying_Card();

    int rank;
    int value;

    void InitCard(int rank, Suit suit);
    
    FString faceStr = "";

    UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
    UStaticMeshComponent* mesh;


protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

Playing_Card.cpp:




#include "Playing_Card.h"


int rank = 0;
int value = 0;

// Sets default values
APlaying_Card::APlaying_Card()
{
    // 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;

    mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("mesh"));

    RootComponent = mesh;

    mesh->SetScalarParameterValueOnMaterials(TEXT("card_index"), 4);    
}



void APlaying_Card::InitCard(int rank, Suit suit)
{
    this->rank = rank;
    this->suit = suit;

    if (rank == 1)
    {
        value = rank; //todo: find a way to make Ace 1 or 11.
        faceStr = "Ace";
    }
    else if (rank <= 10)
    {
        value = rank;
        faceStr = FString::FromInt(rank);
    }
    else if (rank == 11)
    {
        value = 10;
        faceStr = "Jack";
    }
    else if (rank == 12)
    {
        value = 10;
        faceStr = "Queen";
    }
    else if (rank == 13)
    {
        value = 10;
        faceStr = "King";
    }

}

// Called when the game starts or when spawned
void APlaying_Card::BeginPlay()
{
    Super::BeginPlay();
    
}

// Called every frame
void APlaying_Card::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

and this gives the error: error C4458: declaration of 'rank' hides class member

However, if I change the function parameter names (function posted below) the code compiles without errors.

    /// It works! Just by changing parameter names (note: I still use this->rank)
void APlaying_Card::InitCard(int cardRank, Suit cardSuit)
{
    this->rank = cardRank;
    this->suit = cardSuit;

    if (rank == 1)
    {
        value = rank; //todo: find a way to make Ace 1 or 11.
        faceStr = "Ace";
    }
    else if (rank <= 10)
    {
        value = rank;
        faceStr = FString::FromInt(rank);
    }
    else if (rank == 11)
    {
        value = 10;
        faceStr = "Jack";
    }
    else if (rank == 12)
    {
        value = 10;
        faceStr = "Queen";
    }
    else if (rank == 13)
    {
        value = 10;
        faceStr = "King";
    }

}

What is causing the error when I use the names in my first attempt?

ANSWER

Answered 2021-Aug-28 at 17:15

In the original code, you have global variables rank/suit, class members rank/suit, and parameters rank/suit all within scope in InitCard(). So which ones do you expect the compiler to use on the right-hand of the statements this->rank = rank; this->suit = suit;? It is not going to be the class members, it will be the function parameters since they are in local scope. And the compiler warns you about that, since they have the same names as the class members.

Removing the global variables, and renaming the parameters, avoids any ambiguity. So would initializing the class in its constructor using its member initialization list, not a separate Init method:

UCLASS()
class BLACKJACK_API APlaying_Card : public AActor
{
...
public: 
    ...
    APlaying_Card(int rank, Suit suit);
    ...
};

APlaying_Card::APlaying_Card(int rank, Suit suit) :
    rank(rank), suit(suit) // <-- no ambiguity here! 
{
    ...

    if (rank == 1)
    {
        value = rank; //todo: find a way to make Ace 1 or 11.
        faceStr = "Ace";
    }
    else if (rank <= 10)
    {
        value = rank;
        faceStr = FString::FromInt(rank);
    }
    else if (rank == 11)
    {
        value = 10;
        faceStr = "Jack";
    }
    else if (rank == 12)
    {
        value = 10;
        faceStr = "Queen";
    }
    else if (rank == 13)
    {
        value = 10;
        faceStr = "King";
    }
}

Source https://stackoverflow.com/questions/68960382

QUESTION

The createdefaultsubobject function does not work for UWidgetComponent[UE4.26.2]

Asked 2021-May-30 at 13:32

When creating an object of type UWidgetComponent in the constructor, it throws a compilation error. How to solve this problem?
changed different variations of the PROPERTY macro didn't help also tried to use the New Object function to create an object also didn't help

//.h

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "TestWidgetActor.generated.h"

UCLASS()
class TESTPROJECT_API ATestWidgetActor : public AActor
{
    GENERATED_BODY()
    
public: 
    // Sets default values for this actor's properties
    ATestWidgetActor();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Test")
        class UWidgetComponent* TestWidgetComponent;
    
public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

//.cpp

#include "TestWidgetActor.h"
#include "Components/Widget.h"
#include "Components/WidgetComponent.h"

// Sets default values
ATestWidgetActor::ATestWidgetActor()
{
    // 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;
    this->TestWidgetComponent = CreateDefaultSubobject<UWidgetComponent>("Widget component");
    this->TestWidgetComponent->SetupAttachment(GetRootComponent());
}

//Error

Error LNK2019 reference to an unresolved external character "__declspec(dllimport) private: static class Class * __cdecl UWidgetComponent:: GetPrivateStaticClass(void)" (__imp_?GetPrivateStaticClass@UWidgetComponent@@CAPEAVUClass@@XZ) in the function "public: __cdecl ATestWidgetActor::ATestWidgetActor(void)" (?? 0ATestWidgetActor@@QEAA@XZ). Test Project C:\Users\mark\Documents\Unreal Project\Test Project\Intermediate\Project Files\Test Widget Actor.cpp.obj 1

ANSWER

Answered 2021-May-30 at 13:32

The function is in different module and you didn't add dependency of that module in build script (*.build.cs file)

pic.jpg

Source https://stackoverflow.com/questions/67761376

QUESTION

Pointer to incomplete class type is not allowed Unreal Engine 4.26

Asked 2021-Feb-20 at 21:43

I try to implement the pawn navigation to the player in my game. When I tried that in BP site, it worked perfectly, but I try to transform that in C++ code. And I got a kind of wird error. Befor this I faced another error but I find the NavigationSystem was changed a bit in my ue version, but I figured out problem by changing to UNavigationSystemV1. It might be interfering with my class?

NavPath pointer it gave me the error.

Here is the error list:

> Error (active)    E0393   pointer to incomplete class type is not allowed 37
> Error (active)    E0393   pointer to incomplete class type is not allowed 40
> Error C2027   use of undefined type 'UNavigationPath'37
> Error C2027   use of undefined type 'UNavigationPath' 40

Here is the part of problematic code:

FVector ASTrackerBot::GetNextPathPoint()
{
ACharacter* PlayerPawn =  UGameplayStatics::GetPlayerCharacter(this, 0);

UNavigationPath* NavPath = UNavigationSystemV1::FindPathToActorSynchronously(this, 
GetActorLocation(), PlayerPawn);

if (NavPath->PathPoints.Num() > 1)
{

    return NavPath->PathPoints[1];
}


return GetActorLocation();

}

Here is my entire private cpp file:

#include "AI/STrackerBot.h"
#include "Components/StaticMeshComponent.h"
#include "GameFramework/Character.h"
#include "Kismet/GameplayStatics.h"
#include "Runtime\NavigationSystem\Public\NavigationSystem.h"
#include "Runtime/Engine/Classes/Components/InputComponent.h"


// Sets default values
ASTrackerBot::ASTrackerBot()
{
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

    MeshComp = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MeshComp"));
    MeshComp->SetCanEverAffectNavigation(false);
    RootComponent = MeshComp;
}

// Called when the game starts or when spawned
void ASTrackerBot::BeginPlay()
{
    Super::BeginPlay();
    
}

FVector ASTrackerBot::GetNextPathPoint()
{
    // parcurgere drum pana la locatia playerului
    ACharacter* PlayerPawn =  UGameplayStatics::GetPlayerCharacter(this, 0);
    
    UNavigationPath* NavPath = UNavigationSystemV1::FindPathToActorSynchronously(this, GetActorLocation(), PlayerPawn);

    if (NavPath->PathPoints.Num() > 1)
    {
        // Return next point in the path
        return NavPath->PathPoints[1];
    }

    // nu a reusti sa gaseasca drumul
    return GetActorLocation();
}

// Called every frame
void ASTrackerBot::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

And here is my header file:

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "STrackerBot.generated.h"

UCLASS()
class GAME_API ASTrackerBot : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    ASTrackerBot();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

    UPROPERTY(VisibleAnywhere, Category = "Components")
    UStaticMeshComponent* MeshComp;

    FVector GetNextPathPoint();

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

};

ANSWER

Answered 2021-Feb-20 at 20:11

The definition of UNavigationPath needs to be available at the point where you do NavPath->PathPoints. Without the definition, how does the compiler know that UNavigationPath even has a member called PathPoints? You can have a pointer to a declared but undefined class (i.e., one you defined like class UNavigationPath; with no body) and pass it around but you can't access any of its members. Find the header file that defines UNavigationPath and make sure it's included in your source.

Source https://stackoverflow.com/questions/66295943

QUESTION

How to fix the UClass has no member "WeaponMesh" error?

Asked 2020-Dec-12 at 02:40

Currently I have a class for my character like so:

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "DarkFantasies_MainCharacter_Base.generated.h"
class USpringArmComponent;
class UCameraComponent;
class ADarkFantasies_WeaponBase;

UCLASS()
class PROJECT_DF_API ADarkFantasies_MainCharacter_Base : public ACharacter
{
    GENERATED_BODY()

public:
    ADarkFantasies_MainCharacter_Base();
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Camera")
        USpringArmComponent* SpringArmCom;
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Camera")
        UCameraComponent* CameraCom;
protected:
     virtual void BeginPlay() override;
protected:

void MoveForward(float Value);
void MoveRight(float Value);
void TurnAtRate(float Value);
void LookUpAtRate(float Value);
void InteractPressed();
void LAttackPressed();
void HAttackPressed();

UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Camera")
    float BaseTurnRate;
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Camera")
    float BaseLookUpAtRate;
UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Interaction")
    float TraceDistance;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Animations")
    UAnimMontage* M_LightAttack;

UFUNCTION(BlueprintNativeEvent)
    void TraceForward();
    void TraceForward_Implementation();
public:
    virtual void Tick(float DeltaTime) override;
    virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Weapon")
    TSubclassOf<ADarkFantasies_WeaponBase> Weapon;


private:
    AActor* FocusedActor;


};

Please note the Weapon type. The weapon is a custom blueprint class derived from a custom general class for my weapons that looks like this:

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "DarkFantasies_WeaponBase.generated.h"

UCLASS()
class PROJECT_DF_API ADarkFantasies_WeaponBase : public AActor
{
     GENERATED_BODY()

 public:    
     ADarkFantasies_WeaponBase();

 protected:
    virtual void BeginPlay() override;

public:
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Attributes")
        float BaseDamage;
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Attributes")
        float AttackSpeed;
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Mesh")
        USkeletalMeshComponent* WeaponMesh;

};

Now I have another class which will put a tracker into the sockets of my weapons skeletal mesh in order to track it's movement later on. I am trying to call on that mesh through that blueprint class like so:

Player = Cast<ADarkFantasies_MainCharacter_Base>(MeshComp->GetOwner());
if(Player)
{
    Weapon = Player->Weapon->WeaponMesh; //error occurs here under WeaponMesh
    ActorsToIgnore = { MeshComp->GetOwner() };
    LastLocation1 = Weapon->GetSocketLocation("Trace1");
    LastLocation2 = Weapon->GetSocketLocation("Trace2");
    LastLocation3 = Weapon->GetSocketLocation("Trace3");
    LastLocation4 = Weapon->GetSocketLocation("Trace4");
}

Note that my Weapon variable inside this class is of type USkeletalMeshComponent, which is the same as WeaponMesh inside the Weapon_Base class. But when I call on the mesh I get the error UClass has no member "WeaponMesh". How would I fix that?

Thank you for your help!

ANSWER

Answered 2020-Dec-11 at 07:45

your Weapon is protected value. Protected members are accessible in the class that defines them and in classes that inherit from that class. I don't know where Weapon = Player->Weapon->WeaponMesh; //error occurs here under WeaponMesh is called, but it seems to make an error.

try to make your Weapon value as public or make getter function.

Source https://stackoverflow.com/questions/65211317

QUESTION

How To Detect If An Actor Is Hit In Unreal Engine C++?

Asked 2020-Jun-10 at 20:29

I'm new to Unreal Engine. I'm trying to create a basic game where you control a ball and roll around, trying not to fall out of a tube and stuff. My ball looks like this:

PlayerBall.h

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "PlayerBall.generated.h"

UCLASS()
class ROLLINGBALL_API APlayerBall : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    APlayerBall();

    UPROPERTY(VisibleAnywhere, Category="Mesh")
    UStaticMeshComponent* Mesh;

    UPROPERTY(VisibleAnywhere, Category="Camera")
    class UCameraComponent* Camera;

protected:
    // Called when the game starts or when spawned
    void BeginPlay() override;

public: 
    // Called every frame
    void Tick(float DeltaTime) override;

    // Called to bind functionality to input
    void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

};

PlayerBall.cpp

#include "PlayerBall.h"
#include "Camera/CameraComponent.h"

// Sets default values
APlayerBall::APlayerBall() {
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

    Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    const ConstructorHelpers::FObjectFinder<UStaticMesh> SphereRef(TEXT("StaticMesh'/Game/StarterContent/Shapes/Shape_Sphere.Shape_Sphere'"));
    Mesh->SetStaticMesh(SphereRef.Object);
    Mesh->SetSimulatePhysics(true);
    Mesh->SetEnableGravity(true);
    SetRootComponent(Mesh);

    Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera"));
    Camera->SetRelativeLocation(FVector(-500.0f, 0.0f, 0.0f));
    Camera->SetupAttachment(RootComponent);

    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

// Called when the game starts or when spawned
void APlayerBall::BeginPlay() {
    Super::BeginPlay();

}

// Called every frame
void APlayerBall::Tick(float DeltaTime) {
    Super::Tick(DeltaTime);

}

// Called to bind functionality to input
void APlayerBall::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent) {
    Super::SetupPlayerInputComponent(PlayerInputComponent);

}

I also have some other obstacles and floor. However, I also want some obstacle that kills you if it hits you. I want some sort of method in the APlayerBall class that is called when it is hit, then I can check the type of actor that is hit. What can I do? What component do I use?n I looked for an hour in the documentation, but I couldn't find anything.

I tried adding the RecieveHit method, however it says that it doesn't override from a super class. I added it like this:

void ReceiveHit
(
class UPrimitiveComponent * MyComp,
AActor * Other,
class UPrimitiveComponent * OtherComp,
bool bSelfMoved,
FVector HitLocation,
FVector HitNormal,
FVector NormalImpulse,
const FHitResult & Hit
) override;

ANSWER

Answered 2020-Jun-09 at 05:03

That would be AActor::ReceiveHit, since PlayerBall inherits from APawn which inherits from AActor.

Source https://stackoverflow.com/questions/62275285

QUESTION

OnComponentBeginOverlap.AddDynamic says no instance of the function template matches the argument list?

Asked 2020-Jun-08 at 22:14

In a cpp file, my use of:

BoxComp->OnComponentBeginOverlap.AddDynamic(this, &AAICharacter::OnBoxOverlap);
BoxComp->OnComponentEndOverlap.AddDynamic(this, &AAICharacter::OnBoxEndOverlap);

got the following error:

cannot convert argument 2 from 'void (_cdecl AAICharacter::*)(AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)' to 'void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

Here's what my header file with the associated function looks like. Some of the code has been omitted to try and create what I thought was a minimal reproducible example; if I omitted anything valuable based on my lack of expertise just lmk:

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "Engine/DataTable.h"
#include "Subtitle.h"
#include "Components/BoxComponent.h"
#include "Components/AudioComponent.h"
#include "AICharacter.generated.h"

/**
* The purpose of this class is to create a dummy AI for testing out the code for character interactions.
*/


UCLASS()
class GV_PROJECT_API AAICharacter : public ACharacter
{
GENERATED_BODY()

public:
// Sets default values for this character's properties
AAICharacter();

private:
UFUNCTION()
void OnBoxOverlap(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherIndex, bool bFromSweep, const FHitResult & SweepResult);

UFUNCTION()
void OnBoxEndOverlap(AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherIndex)

protected:

/*If the player is inside this box component he will be able to initiate a conversation with the pawn*/
UPROPERTY(VisibleAnywhere)
UBoxComponent* BoxComp;

Is anyone familiar with this error?

ANSWER

Answered 2020-Jun-08 at 22:14

The error is fairly self-explanatory.

cannot convert argument 2 from 'void (_cdecl AAICharacter::*)(AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)' to 'void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

The second argument in the indicated lines (so &AAICharacter::OnBoxOverlap and &AAICharacter::OnBoxEndOverlap) have the first type listed in the message, while the function being called (AddDynamic()) expects the second type. Sometimes differing types is not a problem, but in this case there is no way to convert from one to the other.

The only trick I see comes after comparing the types in question. It helps to insert spaces so that things line up better.

 void (_cdecl AAICharacter::*)(                      AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)
 void (_cdecl AAICharacter::*)(UPrimitiveComponent*, AActor*,UPrimitiveComponent*,int32,bool,const FHitResult &)

The two member functions take fewer parameters than expected. If this is the only place those functions are used, the additional UPrimitiveComponent* parameter could be added directly to them. Otherwise, you might want to introduce wrapper functions that have the needed signature, ignore their first parameter, and call the method (one wrapper would call OnBoxOverlap(), while the other would call OnBoxEndOverlap()). For example:

UFUNCTION()
void OnBoxOverlapWrapper(UPrimitiveComponent* /*ignored*/, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherIndex, bool bFromSweep, const FHitResult & SweepResult)
{
    OnBoxOverlap(OtherActor, OtherComp, OtherIndex, bFromSweep, SweepResult);
}

This comes with a caveat: do you know the significance of the parameter you are ignoring? Your code might contain a currently-unnoticed bug originating from not making use of that first parameter.

Source https://stackoverflow.com/questions/62255094

QUESTION

UE4: Actor disappears after play is hit

Asked 2020-May-08 at 21:18

I am using Unreal Engine version 4.25. I have created an actor and placed it on a blank template. The actor is visible in the editor but becomes invisible once the play button is hit. I am trying to move the object in circles with my code.

Here's the code:

MyActor.cpp

#include "MyActor.h"

// Sets default values
AMyActor::AMyActor()
{
    // 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;

    Dimensions = FVector(10, 0, 0);
    AxisVector = FVector(1, 0, 0);
    Location   = FVector(1, 0, 0);
    Multiplier = 50.f;

}

// Called when the game starts or when spawned
void AMyActor::BeginPlay()
{
    Super::BeginPlay();

}

// Called every frame
void AMyActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);



    // Updates the angle of the object
    AngleAxis += DeltaTime * Multiplier;

    if (AngleAxis >= 360.0f)
    {
        AngleAxis = 0;
    }

    //Rotates around axis
    FVector RotateValue = Dimensions.RotateAngleAxis(AngleAxis, AxisVector);

    Location.X += RotateValue.X;
    Location.Y += RotateValue.Y;
    Location.Z += RotateValue.Z;

    SetActorLocation(Location, false, 0, ETeleportType::None);

}

MyActor.h

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "MyActor.generated.h"

UCLASS()
class ROBOTEURS_API AMyActor : public AActor
{
    GENERATED_BODY()

public: 
    // Sets default values for this actor's properties
    AMyActor();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

    // declare our float variables
    UPROPERTY(EditAnywhere, Category = Movement)
        float AngleAxis;

    UPROPERTY(EditAnywhere, Category = Movement)
        FVector Dimensions;

    UPROPERTY(EditAnywhere, Category = Movement)
        FVector AxisVector;

    UPROPERTY(EditAnywhere, Category = Movement)
        FVector Location;

    UPROPERTY(EditAnywhere, Category = Movement)
        float Multiplier;

};

What could have gone wrong?

ANSWER

Answered 2020-May-08 at 21:18

This fixed it, I did not create a mesh: https://www.youtube.com/watch?v=30XEdBoPw6c

I added the following:

.cpp

AMyActor::AMyActor()
{
    ...
    Root = CreateDefaultSubobject<USceneComponent>(TEXT("Root"));
    RootComponent = Root;

    Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));
    Mesh->AttachTo(Root);

    ...
}

public: 
    ...

    UPROPERTY()
        USceneComponent* Root;

    UPROPERTY(EditAnywhere)
        UStaticMeshComponent* Mesh;
    ...

Source https://stackoverflow.com/questions/61685472

QUESTION

Pointer related UE4 crash. Where are my pointers wrong?

Asked 2020-Jan-15 at 20:25

I'm creating a third person laser tag shooter thing for fun and I'm having difficulty creating my weapon hierarchy. My main problem is my editor is crashing from an access error from some errors from pointers in my code and I don't understand pointers enough to be able to figure this out myself.

I'm trying to add a weapon to my default pawn ALTPlayer. I'm doing this by using TSubclassOf to ensure I can only attach children of ALTWeapon to my character

If it helps my explanation, current hierarchy is:

APawn->ALTWeapon->ALaserGun

... and I'm planning on adding a bunch more classes with ALTWeapon as their parent. I'm hoping this will make my code organized and easier to code different functionality for each weapon.

With that in mind, I'll start with my ALTPlayer.h file. Here I declare WeaponClass as my subclass variable

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "LTPlayer.generated.h"

class ALTWeapon;

UCLASS()
class LASERTAG_API ALTPlayer : public ACharacter
{
    GENERATED_BODY()

public:
    // Sets default values
    ALTPlayer();

    // Player weapon
    UPROPERTY(EditAnywhere)
    TSubclassOf<ALTWeapon> WeaponClass;
};

Now I'll move into my ALTPlayer.cpp file. Here I'm trying to create an ALaserGun object that's stored in WeaponClass. (I'm also not sure if this is exactly how I'm supposed to do this)

#include "LTPlayer.h"
#include "LaserGun.h"

// Sets default values
ALTPlayer::ALTPlayer()
{
    // Creating Weapon
    this->WeaponClass->GetDefaultObject<ALaserGun>();
}

At this point, I expect to see an ALaserGun component in my blueprint child of ALTPlayer. Although, since I have the pointer issue that's crashing my editor, I don't know if that's what this code produces.

If anyone has any insight on how to fix my pointers so that I don't get an access violation, that would be awesome!

ANSWER

Answered 2020-Jan-15 at 20:25

You're attempting to dereference WeaponClass when you try to access its default object but it hasn't yet been assigned to anything.

You can initialize it in the constructor initializer list, like so:

ALTPlayer::ALTPlayer()
    : WeaponClass(ALTWeapon::StaticClass())
{
}

If this is a class that can be set in a Blueprint default, you can also ensure that it has a value by setting it in PreInitializeComponents:

Declaration:

//~ Begin AActor Interface
virtual void PreInitializeComponents() override;
//~ End AActor Interface

Definition:

void ALTPlayer::PreInitializeComponents()
{
    Super::PreInitializeComponents();

    // Fallback to default Weapon class if none was specified.
    if (WeaponClass == nullptr)
    {
        UE_LOG(LogGameMode, Warning, TEXT("No WeaponClass was specified in %s (%s)"), *GetName(), *GetClass()->GetName());
        WeaponClass = ALTWeapon::StaticClass();
    }
}

Source https://stackoverflow.com/questions/59748315

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