Actor Components, Making Native & Deferred Attached to Socket - Epic Wiki

Actor Components, Making Native & Deferred Attached to Socket

Contents

• 1 Overview
• 2 Deferred Attachment
• 3 .h
• 4 .Cpp Constructor
• 5 What is Mesh?
• 6 Conclusion

Overview

Author: Rama (talk)

Dear Community,

Here is my complete code sample for creating and attaching native C++ actor components!

Deferred Attachment

This code follows the Deferred Attachment model, whereby you pick a name and a socket, but the actual attachment occurs after the Character Blueprint has also initialized.

(blueprints are not yet setup during the C++ constructor, and their values cannot be relied on)

.h

//JoyControl

TSubobjectPtr<UStaticMeshComponent> JoyfulControl; UStaticMesh * AssetSM_JoyControl;   FORCEINLINE void SetupSMComponentsWithCollision(UStaticMeshComponent* Comp) { if(!Comp) return; //~~~~~~~~   Comp->bOwnerNoSee = false; Comp->bCastDynamicShadow = true; Comp->CastShadow = true; Comp->BodyInstance.SetObjectType(ECC_WorldDynamic); Comp->BodyInstance.SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics); Comp->BodyInstance.SetResponseToAllChannels(ECR_Ignore); Comp->BodyInstance.SetResponseToChannel(ECC_WorldStatic, ECR_Block); Comp->BodyInstance.SetResponseToChannel(ECC_WorldDynamic, ECR_Block); Comp->BodyInstance.SetResponseToChannel(ECC_Pawn, ECR_Block); Comp->SetHiddenInGame(false); }

.Cpp Constructor

//Asset, Reference Obtained Via Right Click in Editor

static ConstructorHelpers::FObjectFinder<UStaticMesh> StaticMeshOb_AW2(TEXT("StaticMesh'/Game/VictoryGoals/Mechs/JoyControl/JoyControl_WindTurtle.JoyControl_WindTurtle'"));   AssetSM_JoyControl = StaticMeshOb_AW2.Object;   //Create JoyfulControl = ObjectInitializer.CreateDefaultSubobject < UStaticMeshComponent > (this, TEXT("JoyfulControlYay"));   //Set Mesh JoyfulControl->SetStaticMesh(AssetSM_JoyControl);   //Setup (see .h) SetupSMComponentsWithCollision(JoyfulControl);   //Deferred Attachment (Ty Nick W.! Actual attach gets done after blueprint stuff) JoyfulControl->AttachParent = Mesh; JoyfulControl->AttachSocketName = "JoyControl";

What is Mesh?

Mesh is a great choice for a component to attach to if you are deriving from an ACharacter class.

If not using ACharacter, and if you have a RootComponent for your actor class already,

you can simply replace Mesh with RootComponent

JoyfulControl->AttachParent = RootComponent;

If you are making a new actor class that does not have a RootComponent, then make one of your new components into the RootComponent

RootComponent = YourComp;

Conclusion

Enjoy!

Rama (talk)

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