SubChunk

Sub-chunk terrain response: per-entry serialized paletted storage, render heightmaps and blob cache IDs.

sub-chunk.bin

struct SubChunk {
  bool                                         CacheEnabled;
  DimensionType                                DimensionType;
  SubChunkPos                                  CenterPos;
  varuint32 [] · SubChunkPacketData[]          SubChunkData;
}

Structure

Field	Type	Description
Cache Enabled	bool
Dimension Type	DimensionType
Center Pos	SubChunkPos
Sub Chunk Data	varuint32 count + SubChunkPacketData[]	Length-prefixed sequence.

Structure of SubChunkPos

Field	Type	Description
X	int32 (LE)
Y	int32 (LE)
Z	int32 (LE)

Structure of SubChunkPacketData

Field	Type	Description
Sub Chunk Pos Offset	SubChunkPosOffset
Result	SubChunkRequestResult
Serialized Sub Chunk	optional byte + string	Presence flag on the wire; value omitted when absent.
Height Map Data	HeightmapData
Blob Id	optional byte + uint64	Presence flag on the wire; value omitted when absent.

Structure of SubChunkPosOffset

Field	Type	Description
X	int8 (LE)
Y	int8 (LE)
Z	int8 (LE)

Structure of HeightmapData

Field	Type	Description
Height Map Type	HeightMapDataType
Subchunk Height Map	optional byte + array[list[int8], 16]	Presence flag on the wire; value omitted when absent.
Render Height Map Type	HeightMapDataType
Subchunk Render Height Map	optional byte + array[list[int8], 16]	Presence flag on the wire; value omitted when absent.

SubChunkRequestResult values

0 Undefined

1 Success

2 LevelChunkDoesntExist

3 WrongDimension

4 PlayerDoesntExist

5 IndexOutOfBounds

6 SuccessAllAir (no body sent)

Notes

No special notes.