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Add documentation for map block format 27 (#5576)
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@ -1,12 +1,13 @@
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=============================
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Minetest World Format 22...25
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Minetest World Format 22...27
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=============================
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This applies to a world format carrying the block serialization version
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22...25, used at least in
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22...27, used at least in
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- 0.4.dev-20120322 ... 0.4.dev-20120606 (22...23)
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- 0.4.0 (23)
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- 24 was never released as stable and existed for ~2 days
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- 27 was added in 0.4.15-dev
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The block serialization version does not fully specify every aspect of this
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format; if compliance with this format is to be checked, it needs to be
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@ -262,15 +263,36 @@ u8 flags
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- 0x02: day_night_differs: Whether the lighting of the block is different
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on day and night. Only blocks that have this bit set are updated when
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day transforms to night.
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- 0x04: lighting_expired: If true, lighting is invalid and should be
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updated. If you can't calculate lighting in your generator properly,
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you could try setting this 1 to everything and setting the uppermost
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block in every sector as is_underground=0. I am quite sure it doesn't
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work properly, though.
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- 0x04: lighting_expired: Not used in version 27 and above. If true,
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lighting is invalid and should be updated. If you can't calculate
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lighting in your generator properly, you could try setting this 1 to
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everything and setting the uppermost block in every sector as
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is_underground=0. I am quite sure it doesn't work properly, though.
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- 0x08: generated: True if the block has been generated. If false, block
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is mostly filled with CONTENT_IGNORE and is likely to contain eg. parts
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of trees of neighboring blocks.
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u16 lighting_complete
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- Added in version 27.
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- This contains 12 flags, each of them corresponds to a direction.
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- Indicates if the light is correct at the sides of a map block.
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Lighting may not be correct if the light changed, but a neighbor
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block was not loaded at that time.
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If these flags are false, Minetest will automatically recompute light
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when both this block and its required neighbor are loaded.
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- The bit order is:
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nothing, nothing, nothing, nothing,
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night X-, night Y-, night Z-, night Z+, night Y+, night X+,
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day X-, day Y-, day Z-, day Z+, day Y+, day X+.
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Where 'day' is for the day light bank, 'night' is for the night
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light bank.
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The 'nothing' bits should be always set, as they will be used
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to indicate if direct sunlight spreading is finished.
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- Example: if the block at (0, 0, 0) has
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lighting_complete = 0b1111111111111110,
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then Minetest will correct lighting in the day light bank when
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the block at (1, 0, 0) is also loaded.
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u8 content_width
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- Number of bytes in the content (param0) fields of nodes
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if map format version <= 23:
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@ -633,9 +633,10 @@ private:
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/*!
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* Each bit indicates if light spreading was finished
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* in a direction. (Because the neighbor could also be unloaded.)
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* Bits: day X+, day Y+, day Z+, day Z-, day Y-, day X-,
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* night X+, night Y+, night Z+, night Z-, night Y-, night X-,
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* nothing, nothing, nothing, nothing.
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* Bits (most significant first):
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* nothing, nothing, nothing, nothing,
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* night X-, night Y-, night Z-, night Z+, night Y+, night X+,
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* day X-, day Y-, day Z-, day Z+, day Y+, day X+.
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*/
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u16 m_lighting_complete;
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