# Voxels Chunk (version 1)

Voxel regions layer chunk structure.

Values are separated for extRLE8 compression efficiency.

File format BNF (RFC 5234):

```bnf
chunk    = (65536*byte)    block indices (most significant bytes)
           (65536*byte)    block indices (least significant bytes)
           (65536*byte)    block states (most significant bytes)
           (65536*byte)    block states (least significant bytes)

byte     = %x00-FF         8 bit unsigned integer
```

65536 is number of voxels per chunk (16\*256\*16)

## Block state

Block state is encoded in 16 bits:
- 0-2 bits (3) - block rotation index
- 3-5 bits (3) - segment block bits
- 6-7 bits (2) - reserved
- 8-15 bits (8) - user bits