I am currently trying to rotate a planet by using a Timeline and a CurveFloat and then lerping the result over time to my actors rotation. I can’t for the life of me figuer out why it will not lerp.
I specify the CurrentActorRotation and I also give the TargetActorRotation before I start the lerp function. My outputs log shows the correct current rotation, the correct target rotation, and the correct alpha values returned from my curvefloat, but nothing happens in the lerp function. The planet just remains.
Code below:
#.h
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/TimeLineComponent.h"
#include "Planet.generated.h"
class UStaticMeshComponent;
class UTimelineComponent;
class UCurveFloat;
UCLASS()
class STARTRANSPORT_API APlanet : public AActor
{
GENERATED_BODY()
public:
// Sets default values for this actor's properties
APlanet();
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
/* Mesh */
UPROPERTY(EditDefaultsOnly, Category = "Planet")
TObjectPtr<UStaticMeshComponent> PlanetMesh;
/* Timeline */
UPROPERTY(EditAnywhere,BlueprintReadWrite, Category = "Planet")
TObjectPtr<UTimelineComponent> MainTimeline;
/* Curve */
UPROPERTY(EditAnywhere,BlueprintReadWrite, Category = "Planet")
TObjectPtr<UCurveFloat> PlanetRotationCurve;
UFUNCTION()
void RotatePlanet(float Value);
UFUNCTION()
void TimelineEnd();
private:
FRotator PlanetCurrentRotation = FRotator(0.f);
FRotator PlanetTargetRotation = FRotator(0.f);
float RotationAmount = 360.0f;
float LengthOfTimeline = 30.0f;
};
#include "Actors/Planet/Planet.h"
#include "Components/StaticMeshComponent.h"
#include "Components/TimeLineComponent.h"
#include "Curves/CurveFloat.h"
#include "Kismet/GameplayStatics.h"
// Sets default values
APlanet::APlanet()
{
// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bStartWithTickEnabled = true;
PrimaryActorTick.bCanEverTick = true;
bNetLoadOnClient = false;
SetCanBeDamaged(false);
//Mesh
PlanetMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("PlanetMesh"));
PlanetMesh->SetEnableGravity(false);
PlanetMesh->SetCollisionEnabled(ECollisionEnabled::NoCollision);
//Root Component
SetRootComponent(PlanetMesh);
//Curve to use
PlanetRotationCurve = CreateDefaultSubobject<UCurveFloat>(TEXT("CurveFloat"));
//Timeline
MainTimeline = CreateDefaultSubobject<UTimelineComponent>(TEXT("TimeLineComp"));
}
// Called when the game starts or when spawned
void APlanet::BeginPlay()
{
Super::BeginPlay();
//Bind the timelineupdate to the rotateplanet function
FOnTimelineFloat TimelineMovementValue;
FOnTimelineEvent TimelineFinishEvent;
//Bind functions to timeline
TimelineMovementValue.BindUFunction(this, FName("RotatePlanet"));
TimelineFinishEvent.BindUFunction(this, FName("TimelineEnd"));
if (PlanetRotationCurve)
{
//This will allow the curve to feed the data to TimelineMovementValue, which in turn will give RotatePlanet() its value param.
MainTimeline->AddInterpFloat(PlanetRotationCurve, TimelineMovementValue);
//This will now allow the timline, when finished, to call the TimlineFinish event of StartRotating()
MainTimeline->SetTimelineFinishedFunc(TimelineFinishEvent);
}
//Initialize the Starting Rotation and Ending Rotation
PlanetCurrentRotation = GetActorRotation();
PlanetTargetRotation = PlanetCurrentRotation;
//Add the 360 degrees on the Yaw
PlanetTargetRotation.Yaw += RotationAmount;
//Start the timline
MainTimeline->PlayFromStart();
}
void APlanet::RotatePlanet(float Value)
{
//Create the new rotation
FRotator NewRotation = FMath::Lerp(PlanetCurrentRotation, PlanetTargetRotation, Value);
SetActorRotation(NewRotation);
UE_LOG(LogTemp, Warning, TEXT("VALUE: %f "), Value);
UE_LOG(LogTemp, Warning, TEXT("CurrentRotation %s"), *GetActorRotation().ToString());
UE_LOG(LogTemp, Warning, TEXT("PlanetTargetRot: %s"), *PlanetTargetRotation.ToString());
}
//Rotate the planet
void APlanet::TimelineEnd()
{
UE_LOG(LogTemp, Warning, TEXT("TimelineEndCalled"));
}
Link also available for my code on pastebin https://pastebin.com/spJWXaTg
Any help with this would be appreciated.
