public class SpawnCubeSystem : ComponentSystem
{
    Settings settings;
    int totalCubeCount;
    bool isFirstTime;

    public void Init(Settings inSettings, EntityManager entityManager, MeshInstanceRenderer look)
    {
        isFirstTime = true;
        settings = inSettings;

        int totalCubeCount = settings.spectrumSize*2;
        for(int index = 0;
            index < totalCubeCount;
            ++index)
        {
            EntityArchetype archetype = entityManager.CreateArchetype(typeof(Cube),
                                                                      typeof(Origin),
                                                                      typeof(TransformMatrix),
                                                                      typeof(Position),
                                                                      typeof(LocalRotation),
                                                                      typeof(Scale));

            Entity cube = entityManager.CreateEntity(archetype);
            entityManager.AddSharedComponentData(cube, look);
        }
    }

    public struct CubesGroup
    {
        public int Length;
        public ComponentDataArray<Cube> cubes;
        public ComponentDataArray<Position> positions;
        public ComponentDataArray<Origin> origins;
    }

    [Inject]
    CubesGroup group;

    protected override void OnUpdate()
    {
        if(isFirstTime)
        {
            int spectrumSize = settings.spectrumSize;
            for(int index = 0;
                index < totalCubeCount;
                ++index)
            {
                int groupIndex = index;
                SpiralPos pos = Utils.GetSpiralPos(groupIndex);
                Position position = group.positions[groupIndex];
                position.Value = new float3(pos.x, 0, pos.z);
                group.positions[groupIndex] = position;

                Origin origin = group.origins[groupIndex];
                origin.Value = position.Value;
                group.origins[groupIndex] = origin;
            }
        }

        isFirstTime = false;
    }
}