块加载和排序

我正在克隆minecraft，我有两个块加载问题。

第一：确定要加载的块。

我发现了一种方法，它很难看，但对我来说效果很快

1. 定义三维数组（数组）（大小：MAX_CHUNKS_X、MAX_CHUKS_Y、MAX_CHUNKS_Z）
2. 用FALSE填充三维数组
3. 从块列表中传递时，检查块是否在视觉范围内
4. 如果内部集合数组[chunk_x][chunk_y][chunk_6z]=true
5. 通过列表后开始低音阵列
6. 对于所有数组[chunk_x][chunk_y][chunk_6z]==false在chunk_xchunk_y chunk_z处添加到LoadingList块

另一种方法可以减少丑陋并保持快速？

代码：

     ChunksRenderList.clear();
    CChunk* Chunk = NULL;
    s32 RootChunk_X_Location = (floor(RenderCenter.x) / CHUNK_SIZE);
    s32 RootChunk_Y_Location = (floor(RenderCenter.y) / CHUNK_SIZE);
    s32 RootChunk_Z_Location = (floor(RenderCenter.z) / CHUNK_SIZE);
    if(RenderCenter.x < 0)
        RootChunk_X_Location--;
    if(RenderCenter.y < 0)
        RootChunk_Y_Location--;
    if(RenderCenter.z < 0)
        RootChunk_Z_Location--;
    core::vector3s RootChunkLocation(RootChunk_X_Location,RootChunk_Y_Location,RootChunk_Z_Location);
    u32 XZ_ArraySide = (RenderDistance_XZ*2)+1;
    u32 Y_ArraySide  = (RenderDistance_Y*2)+1;
    char array[XZ_ArraySide][Y_ArraySide][XZ_ArraySide];
    memset(array,0,(XZ_ArraySide*XZ_ArraySide*Y_ArraySide));
    for(auto it = Chunks.begin(); it != Chunks.end(); it++)
    {
        Chunk = (it->second);
        if(Chunk->Locked)
            continue;
        if(Chunk->KeepAliveCounter <= 0)
        {
            ChunksUnloadList.push_back(Chunk);
            continue;
        }
        else
        {
            Chunk->KeepAliveCounter -= WORLD_UPDATE_PERIOD;
            Chunk->DistanceToCamera = RenderCenter.distance_to(Chunk->ChunkAbsolutePosition);
        }
        if(Chunk->ChunkPosition.x >= (RootChunk_X_Location - (s32)RenderDistance_XZ) && Chunk->ChunkPosition.x <= (RootChunk_X_Location + (s32)RenderDistance_XZ))
            if(Chunk->ChunkPosition.y >= (RootChunk_Y_Location - (s32)RenderDistance_Y) && Chunk->ChunkPosition.y <= (RootChunk_Y_Location + (s32)RenderDistance_Y))
                if(Chunk->ChunkPosition.z >= (RootChunk_Z_Location - (s32)RenderDistance_XZ) && Chunk->ChunkPosition.z <= (RootChunk_Z_Location + (s32)RenderDistance_XZ))
                {
                    s32 PositionInMatrix_X = Chunk->ChunkPosition.x - (RootChunk_X_Location - (s32)RenderDistance_XZ);
                    s32 PositionInMatrix_Y = Chunk->ChunkPosition.y - (RootChunk_Y_Location - (s32)RenderDistance_Y);
                    s32 PositionInMatrix_Z = Chunk->ChunkPosition.z - (RootChunk_Z_Location - (s32)RenderDistance_XZ);
                    array[PositionInMatrix_X][PositionInMatrix_Y][PositionInMatrix_Z] = true;
                    Chunk->KeepAliveCounter = CHUNK_LIVE_TIME;
                }

        if(not Chunk->NeightboarsUpdated)
        {
            ChunksNeightboarUpdateList.push_back(Chunk);
        }
        if(not Chunk->ChunkUpdated)
        {
            ChunksRebuildList.push_back(Chunk);
        }
        if(not Chunk->Locked and Chunk->VisibleBlocks > 0)
        {
            ChunksRenderList.push_back(Chunk);
        }
    }
    for(u32 y = 0; y < Y_ArraySide; y++)
        for(u32 x = 0; x < XZ_ArraySide; x++)
            for(u32 z = 0; z < XZ_ArraySide; z++)
            {
                s32 ChunkPosition_X = (s32)x + (RootChunk_X_Location - (s32)RenderDistance_XZ);
                s32 ChunkPosition_Y = (s32)y + (RootChunk_Y_Location - (s32)RenderDistance_Y);
                s32 ChunkPosition_Z = (s32)z + (RootChunk_Z_Location - (s32)RenderDistance_XZ);
                if(array[x][y][z] == 0)
                {
   SPendingToLoad ToLoad;
                    ToLoad.Position.set(ChunkPosition_X,ChunkPosition_Y,ChunkPosition_Z);
                    ToLoad.DistanceToCamera = ToLoad.Position.distance_to_sqr(RootChunkLocation);
                    ChunksLoadList.push_back(ToLoad);
                }
            }

第二：如何对ChunksLoadList进行排序以使其像这张图片上的左边一样生效https://www.dropbox.com/s/owjfaaekcj2m23w/58f2e4c8.png?dl=0红色=最接近ChunksLoadList.begin（）Blue=告别ChunksLoadList.begin（）

我尝试使用

    ChunksLoadList.sort([&RootChunkLocation](SPendingToLoad& i,SPendingToLoad& j)
    {
        return i.DistanceToCamera < j.DistanceToCamera;
    }
    );

但它的方法是在大的视野范围内放慢速度。。。我必须如何重写代码才能获得快速加载效果？

对不起，我的英语很糟糕，我希望你能理解我…