【UE5】 C++ 使用 Perlin噪声 随机 生成 平角六边形 地形

public:
    // 宽度
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Map")
    int32 MapWidth;

    // 高度
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Map")
    int32 MapHeight;

    // 块的宽度
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Map")
    float CubeWidth;

    // 块的长度
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Map")
    float CubeHeight;

    // 种子
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Map")
    int32 Seed;

    // 海洋
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> OceanClass;

    // 河流
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> RiverClass;

    // 森林
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> ForestClass;

    // 平原
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> PlainClass;

    // 山脉
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> MountainClass;

    // 道路
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Terrain")
    TSubclassOf<ASpawnActor> RoadClass;

    // 生成地形
    void GenerateDetail();

void ATileMapGenerator::GenerateDetail()
{
    // FRandomStream RandomStream(seed == -1 ? FMath::Rand() : seed);
    Seed = (Seed == -1) ? FMath::Rand() : Seed;

    UE_LOG(LogTemp, Warning, TEXT("Seed: %f"), Seed);

    // float sqrt3 = FMath::Sqrt(3);
    for (int32 h = 0; h < MapHeight; ++h)
    {
        for (int32 w = 0; w < MapWidth; ++w)
        {
             // 平顶六边形瓦片
            float xLocation = w * CubeWidth - (h % 2 == 0 ? 0 : CubeWidth / 2);
            float yLocation = h * CubeHeight * 3 / 4;
            FVector Location(xLocation, yLocation, 0.f);

            FRotator Rotation = FRotator::ZeroRotator;
            FActorSpawnParameters SpawnParams;
            // 使用Perlin噪声来生成地形
            float NoiseValue = FMath::PerlinNoise2D(FVector2D((w / 10.0f) + Seed, (h / 10.0f) + Seed));

            // 根据噪声值选择地形类型
            TSubclassOf<ASpawnActor> TileClass;
            if (NoiseValue < -0.5f)
            {
                TileClass = OceanClass;
            }
            else if (NoiseValue < -0.25f)
            {
                TileClass = RiverClass;
            }
            else if (NoiseValue < 0.0f)
            {
                TileClass = ForestClass;
            }
            if (NoiseValue < 0.25f)
            {
                TileClass = PlainClass;
            }
            else
            {
                TileClass = MountainClass;
            }

            ASpawnActor *SpawnedActor = GetWorld()->SpawnActor<ASpawnActor>(TileClass, Location, Rotation, SpawnParams);
        }
    }
}