Unreal4 使用spline ， splinemesh组件构建赛道小例子

本人最近几天一直想写一个赛道构建的例子，一下使用UnrealReal4中spline，splinemesh组件。具体怎么用大家去看官方的wiki就行了，这里直接贴代码`。

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "RoadSpline.generated.h"class USplineComponent;
class USplineMeshComponent;
class UTextRenderComponent;USTRUCT()
struct FSplineRoadData
{GENERATED_USTRUCT_BODY()UPROPERTY( )bool    LeftGuardRail;UPROPERTY()bool    RightGuardRail;UPROPERTY( )float   TrackBank;UPROPERTY( )float   TrackWidth;UPROPERTY( )float   TrackThickness;FSplineRoadData(): LeftGuardRail(true), RightGuardRail(true), TrackBank(0.0f), TrackWidth(1.0f), TrackThickness(1.0f){}
};UCLASS()
class RACER_API ARoadSpline : public AActor
{GENERATED_BODY()public: // Sets default values for this actor's propertiesARoadSpline();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public: // Called every framevirtual void Tick(float DeltaTime) override;virtual void OnConstruction(const FTransform& Transform);USplineMeshComponent* AddTrackElement(int index,UStaticMesh* mesh);virtual void UpdateSplineMesh(TArray<USplineMeshComponent*>& splineArray);virtual UTextRenderComponent* DrawTrackNumber( int index );
public:UPROPERTY(EditDefaultsOnly, Category = "Road Components")USplineComponent* mSplineComponent;UPROPERTY( )int NumberOfSplinePoints;UPROPERTY( )TArray<FSplineRoadData> RoadDataArray;UPROPERTY( )TArray<USplineMeshComponent*> SplineMeshArray;UPROPERTY( )TArray<USplineMeshComponent*> LeftSplineMeshArray;UPROPERTY( )TArray<USplineMeshComponent*> RightSplineMeshArray;UPROPERTY( )TArray<UTextRenderComponent*> textArray;UPROPERTY(EditDefaultsOnly, Category = "LoopRoad")bool    LoopingTrack; // 是否循环，貌似现在不可用UPROPERTY()int    mCurrentIndex; // 当前编辑第几个UPROPERTY()int    mPointIndex; // 当前编辑第几个UPROPERTY(transient)class UStaticMesh* CameraMesh;UPROPERTY(transient)class UStaticMesh* rightMesh;UPROPERTY(transient)class UStaticMesh* leftMesh;UPROPERTY( EditDefaultsOnly, Category = "Collision" )bool Collisions; // 是否支持碰撞};

一下是实现：

// Fill out your copyright notice in the Description page of Project Settings.#include "RoadSpline.h"
#include "Components/SplineComponent.h"
#include "Components/SplineMeshComponent.h"
#include "Components/TextRenderComponent.h"
#include "Engine/CollisionProfile.h"
#include "UObject/ConstructorHelpers.h"// Sets default values
ARoadSpline::ARoadSpline()
: Collisions(false)
, mPointIndex(0)
{// 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;mSplineComponent = CreateDefaultSubobject<USplineComponent>(TEXT("RoadSpline"));mSplineComponent->SetupAttachment(RootComponent);
//    SetRootComponent(mSplineComponent);{static ConstructorHelpers::FObjectFinder<UStaticMesh> ObjMesh(TEXT("StaticMesh'/Game/TrackGenerator/Props/RoadMesh.RoadMesh'"));CameraMesh = ObjMesh.Object;}{static ConstructorHelpers::FObjectFinder<UStaticMesh> ObjMesh(TEXT("StaticMesh'/Game/TrackGenerator/Props/L_GuardRail.L_GuardRail'"));leftMesh = ObjMesh.Object;}{static ConstructorHelpers::FObjectFinder<UStaticMesh> ObjMesh(TEXT("StaticMesh'/Game/TrackGenerator/Props/R_GuardRail.R_GuardRail'"));rightMesh = ObjMesh.Object;}NumberOfSplinePoints = 0;mCurrentIndex = 0;}// Called when the game starts or when spawned
void ARoadSpline::BeginPlay()
{Super::BeginPlay();}// Called every frame
void ARoadSpline::Tick(float DeltaTime)
{Super::Tick(DeltaTime);}void ARoadSpline::OnConstruction(const FTransform &Transform)
{if (mSplineComponent == NULL) {return ;}NumberOfSplinePoints = mSplineComponent->GetNumberOfSplinePoints();int RoadDataNum = RoadDataArray.Num() ;if (RoadDataNum < NumberOfSplinePoints) {int addNum = NumberOfSplinePoints - RoadDataNum;for (int i =0 ; i<addNum; i++) {FSplineRoadData item;RoadDataArray.Add( item );}}else if( RoadDataNum > NumberOfSplinePoints ){int subNum = NumberOfSplinePoints - RoadDataNum;for (int i =0 ; i<subNum; i++) {RoadDataArray.Pop();}}int lastIndex = LoopingTrack ? NumberOfSplinePoints - 1 : NumberOfSplinePoints - 2;for ( ; mCurrentIndex <= lastIndex; mCurrentIndex++){FSplineRoadData road_item = RoadDataArray[mCurrentIndex];if (road_item.RightGuardRail){USplineMeshComponent* splineMeshCom = AddTrackElement(mCurrentIndex, rightMesh);RightSplineMeshArray.Add(splineMeshCom);}if (road_item.LeftGuardRail){USplineMeshComponent* splineMeshCom = AddTrackElement(mCurrentIndex, leftMesh);LeftSplineMeshArray.Add(splineMeshCom);}{
//            GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("list"));USplineMeshComponent* splineMeshCom = AddTrackElement(mCurrentIndex, CameraMesh);SplineMeshArray.Add(splineMeshCom);}}for (; mPointIndex < NumberOfSplinePoints ; mPointIndex ++){
//        GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("point"));UTextRenderComponent* renderCom = DrawTrackNumber( mPointIndex );textArray.Add( renderCom );}for (int i = 0 ; i< textArray.Num(); i++){UTextRenderComponent* renderCom = textArray[i];if (renderCom) {FVector LocalPosition,LocalTangent;mSplineComponent->GetLocalLocationAndTangentAtSplinePoint(i,LocalPosition,LocalTangent);LocalPosition.Z += 100;FVector Scale3D(1.0,1.0,1.0);LocalTangent *= -1;FRotator rotator = LocalTangent.Rotation();FTransform tranform( rotator,LocalPosition,Scale3D );renderCom->SetRelativeTransform(tranform);}}UpdateSplineMesh(SplineMeshArray);UpdateSplineMesh(LeftSplineMeshArray);UpdateSplineMesh(RightSplineMeshArray);}void ARoadSpline::UpdateSplineMesh(TArray<USplineMeshComponent*>& splineArray)
{for (int i =0 ; i<splineArray.Num(); i++) {USplineMeshComponent* segment = splineArray[i];if (segment) {FVector LocalStartPosition,LoccalStartTangent,LocalEndPosition,LocalEndTangent;mSplineComponent->GetLocalLocationAndTangentAtSplinePoint(i,LocalStartPosition,LoccalStartTangent);mSplineComponent->GetLocalLocationAndTangentAtSplinePoint(i+1, LocalEndPosition,LocalEndTangent);segment->SetStartAndEnd(LocalStartPosition, LoccalStartTangent,LocalEndPosition, LocalEndTangent);}}
}USplineMeshComponent* ARoadSpline::AddTrackElement(int index, UStaticMesh *mesh)
{UStaticMesh* LocalTrackElementMesh = mesh;int LocalCurrentTrackPoint = index;int LocalNextTrackPoint = ( index + 1 ) % NumberOfSplinePoints;FString text = FString::Printf(TEXT("%d,%d"),LocalCurrentTrackPoint,LocalNextTrackPoint);GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, text);FSplineRoadData roadItem = RoadDataArray[LocalCurrentTrackPoint];FSplineRoadData nextRoadItem = RoadDataArray[LocalNextTrackPoint];int LocalStartRoll = roadItem.TrackBank;int LocalEndRoll = nextRoadItem.TrackBank;FVector2D LocalEndScale(nextRoadItem.TrackWidth,nextRoadItem.TrackThickness);FVector2D LocalStartScale(roadItem.TrackWidth,roadItem.TrackThickness);USplineMeshComponent* const Segment = NewObject<USplineMeshComponent>(this);if (Segment){
//      GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("add"));Segment->SetStaticMesh(LocalTrackElementMesh);Segment->SetStartRoll(LocalStartRoll,true);Segment->SetEndRoll(LocalEndRoll);Segment->SetStartScale(LocalStartScale);Segment->SetEndScale(LocalEndScale);Segment->SetMobility(EComponentMobility::Stationary);if ( Collisions)Segment->SetCollisionEnabled(ECollisionEnabled::QueryAndPhysics);elseSegment->SetCollisionEnabled(ECollisionEnabled::NoCollision);Segment->SetForwardAxis(ESplineMeshAxis::X);Segment->SetupAttachment( RootComponent );Segment->RegisterComponent();return Segment;}return NULL;
}UTextRenderComponent* ARoadSpline::DrawTrackNumber(int index)
{FString indexStr = FString::Printf( TEXT( "%d" ),index);FText TestHUDText = FText::FromString(indexStr);UTextRenderComponent* renderCom = NewObject<UTextRenderComponent>(this);if ( renderCom ) {renderCom->SetupAttachment( RootComponent );renderCom->RegisterComponent( );renderCom->SetText( TestHUDText );return renderCom;}return NULL;}

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Unreal4 使用spline ， splinemesh组件构建赛道小例子

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