2011-06-04 09:54:26 -04:00
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I'll try to quickly document the newest block format in here (might contain
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errors). Refer to the mapgen or minetestmapper script for the directory
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structure and file naming. There are two sector namings possible,
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sector/XXXXZZZZ and sector/XXX/ZZZ.
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There also exists files map_meta.txt and chunk_meta, that are used by the
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generator. If they are not found or invalid, the generator will currently
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behave quite strangely.
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The MapBlock file format (sectors2/XXX/ZZZ/YYYY):
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2011-06-04 09:58:20 -04:00
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-------------------------------------------------
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2011-06-04 09:54:26 -04:00
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NOTE: Byte order is MSB first.
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u8 version
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- map format version number, this one is version 17
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u8 flags
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- Flag bitmasks:
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- 0x01: is_underground: Should be set to 0 if there will be no light
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obstructions above the block. If/when sunlight of a block is updated and
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there is no block above it, this value is checked for determining whether
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sunlight comes from the top.
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- 0x02: day_night_differs: Whether the lighting of the block is different on
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day and night. Only blocks that have this bit set are updated when day
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transforms to night.
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- 0x04: lighting_expired: If true, lighting is invalid and should be updated.
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If you can't calculate lighting in your generator properly, you could try
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setting this 1 to everything and setting the uppermost block in every
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sector as is_underground=0. I am quite sure it doesn't work properly,
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though.
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zlib-compressed map data:
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- content:
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u8[4096]: content types
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u8[4096]: param1 values
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u8[4096]: param2 values
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zlib-compressed node metadata
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- content:
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u16 version (=1)
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u16 count of metadata
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foreach count:
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u16 position (= p.Z*MAP_BLOCKSIZE*MAP_BLOCKSIZE + p.Y*MAP_BLOCKSIZE + p.X)
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u16 type_id
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u16 content_size
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u8[content_size] misc. stuff contained in the metadata
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u16 mapblockobject_count
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- always write as 0.
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- if read != 0, just fail.
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foreach mapblockobject_count:
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- deprecated, should not be used. Length of this data can only be known by
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properly parsing it. Just hope not to run into any of this.
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u8 static object version:
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- currently 0
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u16 static_object_count
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foreach static_object_count:
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u8 type (object type-id)
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s32 pos_x * 1000
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s32 pos_y * 1000
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s32 pos_z * 1000
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u16 data_size
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u8[data_size] data
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u32 timestamp
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- Timestamp when last saved, as seconds from starting the game.
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- 0xffffffff = invalid/unknown timestamp, nothing will be done with the time
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difference when loaded (recommended)
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2011-06-04 09:58:20 -04:00
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Node metadata format:
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---------------------
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Sign metadata:
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u16 string_len
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u8[string_len] string
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Furnace metadata:
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TBD
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Chest metadata:
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TBD
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2011-06-04 09:54:26 -04:00
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// END
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