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Add OpenDoor C++ Component to Static Mesh in Blueprint class

Development Discussion Blueprint Visual Scripting
#1

Hello everyone,

I have created a Blueprint, where there is a static mesh and a box collision. The static mesh in this case is a door and the box collision will open it when the player overlaps it.

Now my problem is that I created an OpenDoor Component in C++, my Component needs to be associated (added as component) to the actor you want to rotate. But there’s isn’t “Add to component” to the static mesh in the blueprint. I have no way of adding my C++ component to my static mesh, here’s an image of what I’m talking about:

https://imgur.com/a/3Gu44gC

How can I make this work? Do I need to change my Open Door component to take a static mesh and how? Or is there a simple fix?

I have exposed my OpenDoor and CloseDoor method of my C++ component with UFUNCTION(BlueprintCallable)

My OpenDoor component header :
​​​​​​​



UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class MYPROJECT_API UOpenDoor : public UActorComponent
{
    GENERATED_BODY()

public:    
    // Sets default values for this component's properties
    UOpenDoor();

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

public:    
    // Called every frame
    virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;
    void OpenDoor(float DeltaTime);
    void CloseDoor(float DelaTime);

private:
    float InitialYaw;

    float CurrentYaw;

    UPROPERTY(EditAnywhere)
    float OpenAngle = 90.0f;

    UPROPERTY(EditAnywhere)
    ATriggerVolume* PressurePlate;

    UPROPERTY(EditAnywhere)
    AActor* ActorThatOpens;

    float DoorLastOpened = 0.f;

    UPROPERTY(EditAnywhere)
    float DoorCloseDelay = 0.5f; // half a second 

    UPROPERTY(EditAnywhere)
    float DoorOpenSpeed = 0.8f; 

    UPROPERTY(EditAnywhere)
    float DoorCloseSpeed = 2.0f; 
};

Thank you for reading!

#2

Not 100% sure based on what you posted here. But I’m assuming the blueprint is an Actor or child of an actor. You have to add an actorcomponent to an actor (The blueprint itself) not the static mesh. The static mesh is a component of the blueprint as well.

https://docs.unrealengine.com/en-US/Gameplay/HowTo/AddingComponents/Blueprints/index.html

As long as you compiled your code. That component should show up in the add component list

#3

Thanks mBrock, I’ll try this and tell you how it goes. Thank you

#4

When I add a Child Actor Component to my Blueprint, I still can’t add a C++ Component to it. The Child Actor Component takes only Blueprint. Any help?

#5

It has been a while but are you using the correct UCLASS Specifiers?
BlueprintSpawnableComponent sounds like it lets you spawn it as an actor. - If present, the Component class can be spawned by a Blueprint.

I know when you do c++ to anything blueprint you need all the Specifiers correct or it just wont work

#6 


 #include "CoreMinimal.h"
#include "Components/ActorComponent.h"
#include "DVCharacterBuffsComponent.generated.h"
  UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
class DEUSVOX_API UDVCharacterBuffsComponent : public UActorComponent
{
GENERATED_BODY()
 public: // Sets default values for this component's properties UDVCharacterBuffsComponent();
 protected: // Called when the game starts virtual void BeginPlay() override;
 public: // Called every frame virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;  
};

Humm i looked at one of my old projects … and this code lets me add it to a blueprint … so yours looks good.

#7

Maybe create a child blueprint from the cpp file? in the content browser right click and select create blueprint based on this … then use the child to add it…
Not the ideal way … but might be a temp work around