Spline应用

Spline移动对象

让角色跟随Spline的轨迹移动：

蓝图实现为：BP_Spline_Move

蓝图原理为：

Spline管道

通过Spline来控制管道类的物体的摆放：

蓝图实现为：BP_Spline_Pipeline

蓝图原理为：

Spline揽绳

下面使用Spline来放置揽绳一样的东西：

蓝图实现为：BP_LanSheng

蓝图实现细节为：

Spline放置Actor

Spline固定距离

固定距离摆放物体，拖拽Spline即可实现。

蓝图实现为：BP_Spline_SetActor

蓝图原理为：

Spline放置路块

每固定一个距离放置路块，并且路块会填充该距离：

蓝图实现为：BP_Spline_SetRoadActor

蓝图原理为：

Spline放置墙块

使用Spline放置墙块，在两个节点之间放置一块墙，不管角度如何，两个墙的衔接处不会扭曲。

需要的资料有：

• Spline墙块蓝图
• 墙块材质
• 墙块模型

蓝图原理为：

代码实现

下面是C++实现spline放置墙块的实现：

//==============================AMySplineActor.h==========================

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SplineComponent.h"
#include "Components/SplineMeshComponent.h"

#include "MySplineActor.generated.h"

UCLASS()
class MYRUNTIMETOOLS_API AMySplineActor : public AActor
{
    GENERATED_BODY()

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

    UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = "AAA MySceneComponent",meta = (AllowPrivateAccess = true))
    USceneComponent* MyRootComp;
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "AAA MySceneComponent",meta = (AllowPrivateAccess = true))
    USplineComponent* MySpline; 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "AAA MySceneComponent",meta = (AllowPrivateAccess = true))
    UStaticMesh* targetMesh;
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "AAA MySceneComponent",meta = (AllowPrivateAccess = true))
    UMaterial* targetMaterial;
    
    void PutMeshWithPoints();
    virtual void OnConstruction(const FTransform& Transform) override;
    
protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

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


//==============================AMySplineActor.cpp==========================
#include "MySplineActor.h"


// Sets default values
AMySplineActor::AMySplineActor()
{
    // 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;
    MyRootComp = CreateDefaultSubobject<USceneComponent>(TEXT("RootComp"));
    //MyRootComp->SetMobility(EComponentMobility::Movable);
    RootComponent = MyRootComp;

    MySpline = CreateDefaultSubobject<USplineComponent>(TEXT("MySpline"));
    MySpline->SetupAttachment(MyRootComp);
}

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

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

void AMySplineActor::PutMeshWithPoints()
{
    int pointNum = MySpline->GetNumberOfSplinePoints();
    
    if(pointNum<2)
        return;
    
    for(int i=0;i<pointNum-1;i++)
    {
        const int pointEndNum = (i+1)%pointNum;
        USplineMeshComponent* pSplineMesh = NewObject<USplineMeshComponent>(this, USplineMeshComponent::StaticClass());
        pSplineMesh->SetMobility(EComponentMobility::Movable);
        pSplineMesh->CreationMethod = EComponentCreationMethod::UserConstructionScript;
        pSplineMesh->SetStaticMesh(targetMesh);
        pSplineMesh->SetMaterial(0,targetMaterial);
        //pSplineMesh->SetupAttachment(MySpline);
        pSplineMesh->AttachToComponent(MySpline,FAttachmentTransformRules::KeepRelativeTransform);
        //pSplineMesh->SetForwardAxis(ForwardAxis, false);
        FVector StartPos;
        FVector StartTangent;
        MySpline->GetLocationAndTangentAtSplinePoint(i, StartPos, StartTangent, ESplineCoordinateSpace::Local);
        FVector EndPos;
        FVector EndTangent;
        MySpline->GetLocationAndTangentAtSplinePoint(pointEndNum, EndPos, EndTangent, ESplineCoordinateSpace::Local);
        pSplineMesh->SetStartAndEnd(StartPos, StartTangent, EndPos, EndTangent);
    }
 
    // Register the component
    RegisterAllComponents();

}

void AMySplineActor::OnConstruction(const FTransform& Transform)
{
    Super::OnConstruction(Transform);
    PutMeshWithPoints();
}