Hey there I am trying to convert a blueprint that spawns meshes ( in this case a fence) along a spline.
I have a working blueprint but I would like to convert to c++ for optimization.
Spline Tool posted by anonymous | blueprintUE | PasteBin For Unreal Engine
That is my current blueprint code.
Here is my rough translation to c++
Header
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SplineComponent.h"
#include "Components/SplineMeshComponent.h"
#include "Engine/StaticMesh.h"
#include "MeshSplineTool.generated.h"
UCLASS()
class PHAROS_API AMeshSplineTool : public AActor
{
GENERATED_BODY()
public:
// Sets default values for this actor's properties
AMeshSplineTool();
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
public:
// Called every frame
virtual void Tick(float DeltaTime) override;
// Components //
// Spline Component
UPROPERTY(VisibleAnywhere,BlueprintReadOnly,Blueprintable,Category="Spline")
class USplineComponent* MySplineComponent;
// Static Mesh To Spawn Along Spline
UPROPERTY(EditAnywhere,Blueprintable,Category="PharosSettings")
class UStaticMesh* MeshAsset;
// Functions //
// Get Length of MeshAsset //
UFUNCTION(BlueprintPure,Category="SplineMesh")
float GetMeshLength();
// Get Length to Loop //
UFUNCTION(BlueprintPure,Category="SplineMesh")
int GetLoopLength();
// Spawn Mesh //
UFUNCTION(BlueprintCallable,Category="SplineMesh")
void SpawnMeshAlongSpline();
UPROPERTY(BlueprintReadWrite,EditAnywhere,Category="PharosSettings")
UMaterial *MeshAssetMaterial;
};
Source
// Fill out your copyright notice in the Description page of Project Settings.
#include "Engine/StaticMesh.h"
#include "MeshSplineTool.h"
#include "Math/UnrealMathUtility.h"
#include "Components/SplineComponent.h"
#include "Components/SplineMeshComponent.h"
// Sets default values
AMeshSplineTool::AMeshSplineTool()
{
// 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;
// Create Spline Component
MySplineComponent = CreateDefaultSubobject<USplineComponent>(TEXT("SplineComponent"));
// Attach Spline Component To The Root Component
SetRootComponent(MySplineComponent);
}
// Called when the game starts or when spawned
void AMeshSplineTool::BeginPlay()
{
Super::BeginPlay();
}
// Called every frame
void AMeshSplineTool::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
// Get Mesh Length //
float AMeshSplineTool::GetMeshLength()
{
if (MeshAsset)
{
FBoxSphereBounds Bounds = MeshAsset->GetBounds();
return Bounds.BoxExtent.X * 2.0f;
}
else
{
return 0.0f;
}
}
// Get Loop Length //
int AMeshSplineTool::GetLoopLength()
{
float LocalMeshLength = GetMeshLength();
float LocalSplineLength = MySplineComponent->GetSplineLength();
return FMath::CeilToInt(LocalSplineLength / LocalMeshLength);
}
// Spawn Mesh Along Spline //
void AMeshSplineTool::SpawnMeshAlongSpline()
{
int NumberOfLoops = GetLoopLength(); // Set Length Of Loop
float MeshSize = GetMeshLength(); // Set Mesh Size
for (int i = 0; i < NumberOfLoops; ++i) // Loop
{
if (i * MeshSize + MeshSize > MySplineComponent->GetSplineLength())
{
UE_LOG(LogTemp, Warning, TEXT("True"));
}
else
{
USplineMeshComponent* NewSplineMeshComponent = NewObject<USplineMeshComponent>(this,USplineMeshComponent::StaticClass(),TEXT("MySpline"));
NewSplineMeshComponent->RegisterComponent();
NewSplineMeshComponent->CreationMethod = EComponentCreationMethod::UserConstructionScript;
FVector MStartLocation = MySplineComponent->GetLocationAtDistanceAlongSpline(i * MeshSize,ESplineCoordinateSpace::Local);
FVector MStartTangent = MySplineComponent->GetLocationAtDistanceAlongSpline(i * MeshSize,ESplineCoordinateSpace::Local).GetClampedToSize(0.0f,MeshSize);
FVector MEndLocation = MySplineComponent->GetLocationAtDistanceAlongSpline(i * MeshSize+MeshSize,ESplineCoordinateSpace::Local);
FVector MEndTangent = MySplineComponent->GetLocationAtDistanceAlongSpline(i * MeshSize+MeshSize,ESplineCoordinateSpace::Local).GetClampedToSize(0.0f,MeshSize);
NewSplineMeshComponent->SetMobility(EComponentMobility::Movable);
NewSplineMeshComponent->SetStaticMesh(MeshAsset);
NewSplineMeshComponent->SetMaterial(0,MeshAssetMaterial);
NewSplineMeshComponent->SetStartAndEnd(MStartLocation,MStartTangent,MEndLocation,MEndTangent,true);
NewSplineMeshComponent->SetCollisionEnabled(ECollisionEnabled::QueryAndProbe);
NewSplineMeshComponent->AttachToComponent(MySplineComponent,FAttachmentTransformRules::FAttachmentTransformRules(EAttachmentRule::KeepRelative, true));
UE_LOG(LogTemp, Warning, TEXT("False"));
}
}
}
When I compile this and run the function in editor it crashes the editor and in my IDE Log i see its an infinite loop out putting the test False from my loop.
How can i fix this and make it work as desired.
The blueprint code works as shown in this picture but its just heavy so wanting to convert to c++.
Any help would be great thank you.
