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+Minetest Lua Client Modding API Reference 0.4.15
+================================================
+* More information at <http://www.minetest.net/>
+* Developer Wiki: <http://dev.minetest.net/>
+
+Introduction
+------------
+
+**WARNING: The client API is currently unstable, and may break/change without warning.**
+
+Content and functionality can be added to Minetest 0.4.15-dev+ by using Lua
+scripting in run-time loaded mods.
+
+A mod is a self-contained bunch of scripts, textures and other related
+things that is loaded by and interfaces with Minetest.
+
+Transfering client-sided mods form the server to the client is planned, but not implemented yet.
+
+If you see a deficiency in the API, feel free to attempt to add the
+functionality in the engine and API. You can send such improvements as
+source code patches on GitHub (https://github.com/minetest/minetest).
+
+Programming in Lua
+------------------
+If you have any difficulty in understanding this, please read
+[Programming in Lua](http://www.lua.org/pil/).
+
+Startup
+-------
+Mods are loaded during client startup from the mod load paths by running
+the `init.lua` scripts in a shared environment.
+
+Paths
+-----
+* `RUN_IN_PLACE=1` (Windows release, local build)
+    *  `$path_user`:
+        * Linux: `<build directory>`
+        * Windows: `<build directory>`
+    * `$path_share`
+        * Linux: `<build directory>`
+        * Windows:  `<build directory>`
+* `RUN_IN_PLACE=0`: (Linux release)
+    * `$path_share`
+        * Linux: `/usr/share/minetest`
+        * Windows: `<install directory>/minetest-0.4.x`
+    * `$path_user`:
+        * Linux: `$HOME/.minetest`
+        * Windows: `C:/users/<user>/AppData/minetest` (maybe)
+
+Mod load path
+-------------
+Generic:
+
+* `$path_share/clientmods/`
+* `$path_user/clientmods/` (User-installed mods)
+
+In a run-in-place version (e.g. the distributed windows version):
+
+* `minetest-0.4.x/clientmods/` (User-installed mods)
+
+On an installed version on Linux:
+
+* `/usr/share/minetest/clientmods/`
+* `$HOME/.minetest/clientmods/` (User-installed mods)
+
+Modpack support
+----------------
+**NOTE: Not implemented yet.**
+
+Mods can be put in a subdirectory, if the parent directory, which otherwise
+should be a mod, contains a file named `modpack.txt`. This file shall be
+empty, except for lines starting with `#`, which are comments.
+
+Mod directory structure
+------------------------
+
+    clientmods
+    ├── modname
+    |   ├── depends.txt
+    |   ├── init.lua
+    └── another
+
+### modname
+The location of this directory.
+
+### depends.txt
+List of mods that have to be loaded before loading this mod.
+
+A single line contains a single modname.
+
+Optional dependencies can be defined by appending a question mark
+to a single modname. Their meaning is that if the specified mod
+is missing, that does not prevent this mod from being loaded.
+
+### init.lua
+The main Lua script. Running this script should register everything it
+wants to register. Subsequent execution depends on minetest calling the
+registered callbacks.
+
+`minetest.setting_get(name)` and `minetest.setting_getbool(name)` can be used
+to read custom or existing settings at load time, if necessary.
+
+### `sounds`
+Media files (sounds) that will be transferred to the
+client and will be available for use by the mod.
+
+Naming convention for registered textual names
+----------------------------------------------
+Registered names should generally be in this format:
+
+    "modname:<whatever>" (<whatever> can have characters a-zA-Z0-9_)
+
+This is to prevent conflicting names from corrupting maps and is
+enforced by the mod loader.
+
+### Example
+In the mod `experimental`, there is the ideal item/node/entity name `tnt`.
+So the name should be `experimental:tnt`.
+
+Enforcement can be overridden by prefixing the name with `:`. This can
+be used for overriding the registrations of some other mod.
+
+Example: Any mod can redefine `experimental:tnt` by using the name
+
+    :experimental:tnt
+
+when registering it.
+(also that mod is required to have `experimental` as a dependency)
+
+The `:` prefix can also be used for maintaining backwards compatibility.
+
+Sounds
+------
+**NOTE: max_hear_distance and connecting to objects is not implemented.**
+
+Only Ogg Vorbis files are supported.
+
+For positional playing of sounds, only single-channel (mono) files are
+supported. Otherwise OpenAL will play them non-positionally.
+
+Mods should generally prefix their sounds with `modname_`, e.g. given
+the mod name "`foomod`", a sound could be called:
+
+    foomod_foosound.ogg
+
+Sounds are referred to by their name with a dot, a single digit and the
+file extension stripped out. When a sound is played, the actual sound file
+is chosen randomly from the matching sounds.
+
+When playing the sound `foomod_foosound`, the sound is chosen randomly
+from the available ones of the following files:
+
+* `foomod_foosound.ogg`
+* `foomod_foosound.0.ogg`
+* `foomod_foosound.1.ogg`
+* (...)
+* `foomod_foosound.9.ogg`
+
+Examples of sound parameter tables:
+
+    -- Play locationless
+    {
+        gain = 1.0, -- default
+    }
+    -- Play locationless, looped
+    {
+        gain = 1.0, -- default
+        loop = true,
+    }
+    -- Play in a location
+    {
+        pos = {x = 1, y = 2, z = 3},
+        gain = 1.0, -- default
+        max_hear_distance = 32, -- default, uses an euclidean metric
+    }
+    -- Play connected to an object, looped
+    {
+        object = <an ObjectRef>,
+        gain = 1.0, -- default
+        max_hear_distance = 32, -- default, uses an euclidean metric
+        loop = true,
+    }
+
+Looped sounds must either be connected to an object or played locationless.
+
+### SimpleSoundSpec
+* e.g. `""`
+* e.g. `"default_place_node"`
+* e.g. `{}`
+* e.g. `{name = "default_place_node"}`
+* e.g. `{name = "default_place_node", gain = 1.0}`
+
+Representations of simple things
+--------------------------------
+
+### Position/vector
+
+    {x=num, y=num, z=num}
+
+For helper functions see "Vector helpers".
+
+### pointed_thing
+* `{type="nothing"}`
+* `{type="node", under=pos, above=pos}`
+* `{type="object", id=ObjectID}`
+
+Flag Specifier Format
+---------------------
+Flags using the standardized flag specifier format can be specified in either of
+two ways, by string or table.
+
+The string format is a comma-delimited set of flag names; whitespace and
+unrecognized flag fields are ignored. Specifying a flag in the string sets the
+flag, and specifying a flag prefixed by the string `"no"` explicitly
+clears the flag from whatever the default may be.
+
+In addition to the standard string flag format, the schematic flags field can
+also be a table of flag names to boolean values representing whether or not the
+flag is set. Additionally, if a field with the flag name prefixed with `"no"`
+is present, mapped to a boolean of any value, the specified flag is unset.
+
+E.g. A flag field of value
+
+    {place_center_x = true, place_center_y=false, place_center_z=true}
+
+is equivalent to
+
+    {place_center_x = true, noplace_center_y=true, place_center_z=true}
+
+which is equivalent to
+
+    "place_center_x, noplace_center_y, place_center_z"
+
+or even
+
+    "place_center_x, place_center_z"
+
+since, by default, no schematic attributes are set.
+
+Formspec
+--------
+Formspec defines a menu. It is a string, with a somewhat strange format.
+
+Spaces and newlines can be inserted between the blocks, as is used in the
+examples.
+
+### Examples
+
+#### Chest
+
+    size[8,9]
+    list[context;main;0,0;8,4;]
+    list[current_player;main;0,5;8,4;]
+
+#### Furnace
+
+    size[8,9]
+    list[context;fuel;2,3;1,1;]
+    list[context;src;2,1;1,1;]
+    list[context;dst;5,1;2,2;]
+    list[current_player;main;0,5;8,4;]
+
+#### Minecraft-like player inventory
+
+    size[8,7.5]
+    image[1,0.6;1,2;player.png]
+    list[current_player;main;0,3.5;8,4;]
+    list[current_player;craft;3,0;3,3;]
+    list[current_player;craftpreview;7,1;1,1;]
+
+### Elements
+
+#### `size[<W>,<H>,<fixed_size>]`
+* Define the size of the menu in inventory slots
+* `fixed_size`: `true`/`false` (optional)
+* deprecated: `invsize[<W>,<H>;]`
+
+#### `container[<X>,<Y>]`
+* Start of a container block, moves all physical elements in the container by (X, Y)
+* Must have matching container_end
+* Containers can be nested, in which case the offsets are added
+  (child containers are relative to parent containers)
+
+#### `container_end[]`
+* End of a container, following elements are no longer relative to this container
+
+#### `list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;]`
+* Show an inventory list
+
+#### `list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;<starting item index>]`
+* Show an inventory list
+
+#### `listring[<inventory location>;<list name>]`
+* Allows to create a ring of inventory lists
+* Shift-clicking on items in one element of the ring
+  will send them to the next inventory list inside the ring
+* The first occurrence of an element inside the ring will
+  determine the inventory where items will be sent to
+
+#### `listring[]`
+* Shorthand for doing `listring[<inventory location>;<list name>]`
+  for the last two inventory lists added by list[...]
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+* Sets color of slots border
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>;<tooltip_bgcolor>;<tooltip_fontcolor>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+* Sets color of slots border
+* Sets default background color of tooltips
+* Sets default font color of tooltips
+
+#### `tooltip[<gui_element_name>;<tooltip_text>;<bgcolor>,<fontcolor>]`
+* Adds tooltip for an element
+* `<bgcolor>` tooltip background color as `ColorString` (optional)
+* `<fontcolor>` tooltip font color as `ColorString` (optional)
+
+#### `image[<X>,<Y>;<W>,<H>;<texture name>]`
+* Show an image
+* Position and size units are inventory slots
+
+#### `item_image[<X>,<Y>;<W>,<H>;<item name>]`
+* Show an inventory image of registered item/node
+* Position and size units are inventory slots
+
+#### `bgcolor[<color>;<fullscreen>]`
+* Sets background color of formspec as `ColorString`
+* If `true`, the background color is drawn fullscreen (does not effect the size of the formspec)
+
+#### `background[<X>,<Y>;<W>,<H>;<texture name>]`
+* Use a background. Inventory rectangles are not drawn then.
+* Position and size units are inventory slots
+* Example for formspec 8x4 in 16x resolution: image shall be sized
+  8 times 16px  times  4 times 16px.
+
+#### `background[<X>,<Y>;<W>,<H>;<texture name>;<auto_clip>]`
+* Use a background. Inventory rectangles are not drawn then.
+* Position and size units are inventory slots
+* Example for formspec 8x4 in 16x resolution:
+  image shall be sized 8 times 16px  times  4 times 16px
+* If `true` the background is clipped to formspec size
+  (`x` and `y` are used as offset values, `w` and `h` are ignored)
+
+#### `pwdfield[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* Textual password style field; will be sent to server when a button is clicked
+* When enter is pressed in field, fields.key_enter_field will be sent with the name
+  of this field.
+* `x` and `y` position the field relative to the top left of the menu
+* `w` and `h` are the size of the field
+* Fields are a set height, but will be vertically centred on `h`
+* Position and size units are inventory slots
+* `name` is the name of the field as returned in fields to `on_receive_fields`
+* `label`, if not blank, will be text printed on the top left above the field
+* See field_close_on_enter to stop enter closing the formspec
+
+#### `field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]`
+* Textual field; will be sent to server when a button is clicked
+* When enter is pressed in field, fields.key_enter_field will be sent with the name
+  of this field.
+* `x` and `y` position the field relative to the top left of the menu
+* `w` and `h` are the size of the field
+* Fields are a set height, but will be vertically centred on `h`
+* Position and size units are inventory slots
+* `name` is the name of the field as returned in fields to `on_receive_fields`
+* `label`, if not blank, will be text printed on the top left above the field
+* `default` is the default value of the field
+    * `default` may contain variable references such as `${text}'` which
+      will fill the value from the metadata value `text`
+    * **Note**: no extra text or more than a single variable is supported ATM.
+* See field_close_on_enter to stop enter closing the formspec
+
+#### `field[<name>;<label>;<default>]`
+* As above, but without position/size units
+* When enter is pressed in field, fields.key_enter_field will be sent with the name
+  of this field.
+* Special field for creating simple forms, such as sign text input
+* Must be used without a `size[]` element
+* A "Proceed" button will be added automatically
+* See field_close_on_enter to stop enter closing the formspec
+
+#### `field_close_on_enter[<name>;<close_on_enter>]`
+* <name> is the name of the field
+* if <close_on_enter> is false, pressing enter in the field will submit the form but not close it
+* defaults to true when not specified (ie: no tag for a field)
+
+#### `textarea[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]`
+* Same as fields above, but with multi-line input
+
+#### `label[<X>,<Y>;<label>]`
+* `x` and `y` work as per field
+* `label` is the text on the label
+* Position and size units are inventory slots
+
+#### `vertlabel[<X>,<Y>;<label>]`
+* Textual label drawn vertically
+* `x` and `y` work as per field
+* `label` is the text on the label
+* Position and size units are inventory slots
+
+#### `button[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* Clickable button. When clicked, fields will be sent.
+* `x`, `y` and `name` work as per field
+* `w` and `h` are the size of the button
+* `label` is the text on the button
+* Position and size units are inventory slots
+
+#### `image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]`
+* `x`, `y`, `w`, `h`, and `name` work as per button
+* `texture name` is the filename of an image
+* Position and size units are inventory slots
+
+#### `image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>;<noclip>;<drawborder>;<pressed texture name>]`
+* `x`, `y`, `w`, `h`, and `name` work as per button
+* `texture name` is the filename of an image
+* Position and size units are inventory slots
+* `noclip=true` means the image button doesn't need to be within specified formsize
+* `drawborder`: draw button border or not
+* `pressed texture name` is the filename of an image on pressed state
+
+#### `item_image_button[<X>,<Y>;<W>,<H>;<item name>;<name>;<label>]`
+* `x`, `y`, `w`, `h`, `name` and `label` work as per button
+* `item name` is the registered name of an item/node,
+   tooltip will be made out of its description
+   to override it use tooltip element
+* Position and size units are inventory slots
+
+#### `button_exit[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* When clicked, fields will be sent and the form will quit.
+
+#### `image_button_exit[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]`
+* When clicked, fields will be sent and the form will quit.
+
+#### `textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>]`
+* Scrollable item list showing arbitrary text elements
+* `x` and `y` position the itemlist relative to the top left of the menu
+* `w` and `h` are the size of the itemlist
+* `name` fieldname sent to server on doubleclick value is current selected element
+* `listelements` can be prepended by #color in hexadecimal format RRGGBB (only),
+     * if you want a listelement to start with "#" write "##".
+
+#### `textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>;<selected idx>;<transparent>]`
+* Scrollable itemlist showing arbitrary text elements
+* `x` and `y` position the item list relative to the top left of the menu
+* `w` and `h` are the size of the item list
+* `name` fieldname sent to server on doubleclick value is current selected element
+* `listelements` can be prepended by #RRGGBB (only) in hexadecimal format
+     * if you want a listelement to start with "#" write "##"
+* Index to be selected within textlist
+* `true`/`false`: draw transparent background
+* See also `minetest.explode_textlist_event` (main menu: `engine.explode_textlist_event`)
+
+#### `tabheader[<X>,<Y>;<name>;<caption 1>,<caption 2>,...,<caption n>;<current_tab>;<transparent>;<draw_border>]`
+* Show a tab**header** at specific position (ignores formsize)
+* `x` and `y` position the itemlist relative to the top left of the menu
+* `name` fieldname data is transferred to Lua
+* `caption 1`...: name shown on top of tab
+* `current_tab`: index of selected tab 1...
+* `transparent` (optional): show transparent
+* `draw_border` (optional): draw border
+
+#### `box[<X>,<Y>;<W>,<H>;<color>]`
+* Simple colored semitransparent box
+* `x` and `y` position the box relative to the top left of the menu
+* `w` and `h` are the size of box
+* `color` is color specified as a `ColorString`
+
+#### `dropdown[<X>,<Y>;<W>;<name>;<item 1>,<item 2>, ...,<item n>;<selected idx>]`
+* Show a dropdown field
+* **Important note**: There are two different operation modes:
+     1. handle directly on change (only changed dropdown is submitted)
+     2. read the value on pressing a button (all dropdown values are available)
+* `x` and `y` position of dropdown
+* Width of dropdown
+* Fieldname data is transferred to Lua
+* Items to be shown in dropdown
+* Index of currently selected dropdown item
+
+#### `checkbox[<X>,<Y>;<name>;<label>;<selected>]`
+* Show a checkbox
+* `x` and `y`: position of checkbox
+* `name` fieldname data is transferred to Lua
+* `label` to be shown left of checkbox
+* `selected` (optional): `true`/`false`
+
+#### `scrollbar[<X>,<Y>;<W>,<H>;<orientation>;<name>;<value>]`
+* Show a scrollbar
+* There are two ways to use it:
+     1. handle the changed event (only changed scrollbar is available)
+     2. read the value on pressing a button (all scrollbars are available)
+* `x` and `y`: position of trackbar
+* `w` and `h`: width and height
+* `orientation`:  `vertical`/`horizontal`
+* Fieldname data is transferred to Lua
+* Value this trackbar is set to (`0`-`1000`)
+* See also `minetest.explode_scrollbar_event` (main menu: `engine.explode_scrollbar_event`)
+
+#### `table[<X>,<Y>;<W>,<H>;<name>;<cell 1>,<cell 2>,...,<cell n>;<selected idx>]`
+* Show scrollable table using options defined by the previous `tableoptions[]`
+* Displays cells as defined by the previous `tablecolumns[]`
+* `x` and `y`: position the itemlist relative to the top left of the menu
+* `w` and `h` are the size of the itemlist
+* `name`: fieldname sent to server on row select or doubleclick
+* `cell 1`...`cell n`: cell contents given in row-major order
+* `selected idx`: index of row to be selected within table (first row = `1`)
+* See also `minetest.explode_table_event` (main menu: `engine.explode_table_event`)
+
+#### `tableoptions[<opt 1>;<opt 2>;...]`
+* Sets options for `table[]`
+* `color=#RRGGBB`
+     * default text color (`ColorString`), defaults to `#FFFFFF`
+* `background=#RRGGBB`
+     * table background color (`ColorString`), defaults to `#000000`
+* `border=<true/false>`
+     * should the table be drawn with a border? (default: `true`)
+* `highlight=#RRGGBB`
+     * highlight background color (`ColorString`), defaults to `#466432`
+* `highlight_text=#RRGGBB`
+     * highlight text color (`ColorString`), defaults to `#FFFFFF`
+* `opendepth=<value>`
+     * all subtrees up to `depth < value` are open (default value = `0`)
+     * only useful when there is a column of type "tree"
+
+#### `tablecolumns[<type 1>,<opt 1a>,<opt 1b>,...;<type 2>,<opt 2a>,<opt 2b>;...]`
+* Sets columns for `table[]`
+* Types: `text`, `image`, `color`, `indent`, `tree`
+    * `text`:   show cell contents as text
+    * `image`:  cell contents are an image index, use column options to define images
+    * `color`:   cell contents are a ColorString and define color of following cell
+    * `indent`: cell contents are a number and define indentation of following cell
+    * `tree`:   same as indent, but user can open and close subtrees (treeview-like)
+* Column options:
+    * `align=<value>`
+        * for `text` and `image`: content alignment within cells.
+          Available values: `left` (default), `center`, `right`, `inline`
+    * `width=<value>`
+        * for `text` and `image`: minimum width in em (default: `0`)
+        * for `indent` and `tree`: indent width in em (default: `1.5`)
+    * `padding=<value>`: padding left of the column, in em (default `0.5`).
+      Exception: defaults to 0 for indent columns
+    * `tooltip=<value>`: tooltip text (default: empty)
+    * `image` column options:
+        * `0=<value>` sets image for image index 0
+        * `1=<value>` sets image for image index 1
+        * `2=<value>` sets image for image index 2
+        * and so on; defined indices need not be contiguous empty or
+          non-numeric cells are treated as `0`.
+    * `color` column options:
+        * `span=<value>`: number of following columns to affect (default: infinite)
+
+**Note**: do _not_ use a element name starting with `key_`; those names are reserved to
+pass key press events to formspec!
+
+Spatial Vectors
+---------------
+* `vector.new(a[, b, c])`: returns a vector:
+    * A copy of `a` if `a` is a vector.
+    * `{x = a, y = b, z = c}`, if all `a, b, c` are defined
+* `vector.direction(p1, p2)`: returns a vector
+* `vector.distance(p1, p2)`: returns a number
+* `vector.length(v)`: returns a number
+* `vector.normalize(v)`: returns a vector
+* `vector.floor(v)`: returns a vector, each dimension rounded down
+* `vector.round(v)`: returns a vector, each dimension rounded to nearest int
+* `vector.apply(v, func)`: returns a vector
+* `vector.equals(v1, v2)`: returns a boolean
+
+For the following functions `x` can be either a vector or a number:
+
+* `vector.add(v, x)`: returns a vector
+* `vector.subtract(v, x)`: returns a vector
+* `vector.multiply(v, x)`: returns a scaled vector or Schur product
+* `vector.divide(v, x)`: returns a scaled vector or Schur quotient
+
+Helper functions
+----------------
+* `dump2(obj, name="_", dumped={})`
+     * Return object serialized as a string, handles reference loops
+* `dump(obj, dumped={})`
+    * Return object serialized as a string
+* `math.hypot(x, y)`
+    * Get the hypotenuse of a triangle with legs x and y.
+      Useful for distance calculation.
+* `math.sign(x, tolerance)`
+    * Get the sign of a number.
+      Optional: Also returns `0` when the absolute value is within the tolerance (default: `0`)
+* `string.split(str, separator=",", include_empty=false, max_splits=-1, sep_is_pattern=false)`
+    * If `max_splits` is negative, do not limit splits.
+    * `sep_is_pattern` specifies if separator is a plain string or a pattern (regex).
+    * e.g. `string:split("a,b", ",") == {"a","b"}`
+* `string:trim()`
+    * e.g. `string.trim("\n \t\tfoo bar\t ") == "foo bar"`
+* `minetest.wrap_text(str, limit)`: returns a string
+    * Adds new lines to the string to keep it within the specified character limit
+    * limit: Maximal amount of characters in one line
+* `minetest.pos_to_string({x=X,y=Y,z=Z}, decimal_places))`: returns string `"(X,Y,Z)"`
+    * Convert position to a printable string
+      Optional: 'decimal_places' will round the x, y and z of the pos to the given decimal place.
+* `minetest.string_to_pos(string)`: returns a position
+    * Same but in reverse. Returns `nil` if the string can't be parsed to a position.
+* `minetest.string_to_area("(X1, Y1, Z1) (X2, Y2, Z2)")`: returns two positions
+    * Converts a string representing an area box into two positions
+* `minetest.is_yes(arg)`
+    * returns whether `arg` can be interpreted as yes
+* `table.copy(table)`: returns a table
+    * returns a deep copy of `table`
+
+Minetest namespace reference
+------------------------------
+
+### Utilities
+
+* `minetest.get_current_modname()`: returns the currently loading mod's name, when we are loading a mod
+* `minetest.get_version()`: returns a table containing components of the
+   engine version.  Components:
+    * `project`: Name of the project, eg, "Minetest"
+    * `string`: Simple version, eg, "1.2.3-dev"
+    * `hash`: Full git version (only set if available), eg, "1.2.3-dev-01234567-dirty"
+  Use this for informational purposes only. The information in the returned
+  table does not represent the capabilities of the engine, nor is it
+  reliable or verifyable. Compatible forks will have a different name and
+  version entirely. To check for the presence of engine features, test
+  whether the functions exported by the wanted features exist. For example:
+  `if minetest.nodeupdate then ... end`.
+
+### Logging
+* `minetest.debug(...)`
+    * Equivalent to `minetest.log(table.concat({...}, "\t"))`
+* `minetest.log([level,] text)`
+    * `level` is one of `"none"`, `"error"`, `"warning"`, `"action"`,
+      `"info"`, or `"verbose"`.  Default is `"none"`.
+
+### Global callback registration functions
+Call these functions only at load time!
+
+* `minetest.register_globalstep(func(dtime))`
+    * Called every client environment step, usually interval of 0.1s
+* `minetest.register_on_shutdown(func())`
+    * Called before client shutdown
+    * **Warning**: If the client terminates abnormally (i.e. crashes), the registered
+      callbacks **will likely not be run**. Data should be saved at
+      semi-frequent intervals as well as on server shutdown.
+* `minetest.register_on_connect(func())`
+    * Called at the end of client connection (when player is loaded onto map)
+* `minetest.register_on_receiving_chat_message(func(name, message))`
+    * Called always when a client receive a message
+    * Return `true` to mark the message as handled, which means that it will not be shown to chat
+* `minetest.register_on_sending_chat_message(func(name, message))`
+    * Called always when a client send a message from chat
+    * Return `true` to mark the message as handled, which means that it will not be sent to server
+* `minetest.register_chatcommand(cmd, chatcommand definition)`
+    * Adds definition to minetest.registered_chatcommands
+* `minetest.unregister_chatcommand(name)`
+    * Unregisters a chatcommands registered with register_chatcommand.
+* `minetest.register_on_death(func())`
+    * Called when the local player dies
+* `minetest.register_on_hp_modification(func(hp))`
+    * Called when server modified player's HP
+* `minetest.register_on_damage_taken(func(hp))`
+    * Called when the local player take damages
+* `minetest.register_on_formspec_input(func(formname, fields))`
+    * Called when a button is pressed in the local player's inventory form
+    * Newest functions are called first
+    * If function returns `true`, remaining functions are not called
+* `minetest.register_on_dignode(func(pos, node))`
+    * Called when the local player digs a node
+    * Newest functions are called first
+    * If any function returns true, the node isn't dug
+* `minetest.register_on_punchnode(func(pos, node))`
+    * Called when the local player punches a node
+    * Newest functions are called first
+    * If any function returns true, the punch is ignored
+* `minetest.register_on_placenode(function(pointed_thing, node))`    
+    * Called when a node has been placed
+* `minetest.register_on_item_use(func(item, pointed_thing))`
+    * Called when the local player uses an item.
+    * Newest functions are called first.
+    * If any function returns true, the item use is not sent to server.
+### Sounds
+* `minetest.sound_play(spec, parameters)`: returns a handle
+    * `spec` is a `SimpleSoundSpec`
+    * `parameters` is a sound parameter table
+* `minetest.sound_stop(handle)`
+
+### Timing
+* `minetest.after(time, func, ...)`
+    * Call the function `func` after `time` seconds, may be fractional
+    * Optional: Variable number of arguments that are passed to `func`
+* `minetest.get_us_time()`
+    * Returns time with microsecond precision. May not return wall time.
+* `minetest.get_day_count()`
+    * Returns number days elapsed since world was created, accounting for time changes.
+* `minetest.get_timeofday()`
+    * Returns the time of day: `0` for midnight, `0.5` for midday
+
+### Map
+* `minetest.get_node(pos)`
+    * Returns the node at the given position as table in the format
+      `{name="node_name", param1=0, param2=0}`, returns `{name="ignore", param1=0, param2=0}`
+      for unloaded areas.
+* `minetest.get_node_or_nil(pos)`
+    * Same as `get_node` but returns `nil` for unloaded areas.
+* `minetest.find_node_near(pos, radius, nodenames, [search_center])`: returns pos or `nil`
+    * `radius`: using a maximum metric
+    * `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
+    * `search_center` is an optional boolean (default: `false`)
+      If true `pos` is also checked for the nodes
+* `minetest.get_meta(pos)`
+    * Get a `NodeMetaRef` at that position
+* `minetest.get_node_level(pos)`
+    * get level of leveled node (water, snow)
+* `minetest.get_node_max_level(pos)`
+    * get max available level for leveled node
+
+### Player
+* `minetest.get_wielded_item()`
+    * Returns the itemstack the local player is holding
+* `minetest.send_chat_message(message)`
+    * Act as if `message` was typed by the player into the terminal.
+* `minetest.run_server_chatcommand(cmd, param)`
+    * Alias for `minetest.send_chat_message("/" .. cmd .. " " .. param)`
+* `minetest.clear_out_chat_queue()`
+    * Clears the out chat queue
+* `minetest.localplayer`
+    * Reference to the LocalPlayer object. See [`LocalPlayer`](#localplayer) class reference for methods.
+
+### Client Environment
+* `minetest.get_player_names()`
+    * Returns list of player names on server
+* `minetest.disconnect()`
+    * Disconnect from the server and exit to main menu.
+    * Returns `false` if the client is already disconnecting otherwise returns `true`.
+* `minetest.take_screenshot()`
+    * Take a screenshot.
+* `minetest.get_server_info()`
+    * Returns [server info](#server-info).
+* `minetest.send_respawn()`
+    * Sends a respawn request to the server.
+
+### Storage API
+* `minetest.get_mod_storage()`:
+    * returns reference to mod private `StorageRef`
+    * must be called during mod load time
+
+### Misc.
+* `minetest.parse_json(string[, nullvalue])`: returns something
+    * Convert a string containing JSON data into the Lua equivalent
+    * `nullvalue`: returned in place of the JSON null; defaults to `nil`
+    * On success returns a table, a string, a number, a boolean or `nullvalue`
+    * On failure outputs an error message and returns `nil`
+    * Example: `parse_json("[10, {\"a\":false}]")`, returns `{10, {a = false}}`
+* `minetest.write_json(data[, styled])`: returns a string or `nil` and an error message
+    * Convert a Lua table into a JSON string
+    * styled: Outputs in a human-readable format if this is set, defaults to false
+    * Unserializable things like functions and userdata are saved as null.
+    * **Warning**: JSON is more strict than the Lua table format.
+        1. You can only use strings and positive integers of at least one as keys.
+        2. You can not mix string and integer keys.
+           This is due to the fact that JSON has two distinct array and object values.
+    * Example: `write_json({10, {a = false}})`, returns `"[10, {\"a\": false}]"`
+* `minetest.serialize(table)`: returns a string
+    * Convert a table containing tables, strings, numbers, booleans and `nil`s
+      into string form readable by `minetest.deserialize`
+    * Example: `serialize({foo='bar'})`, returns `'return { ["foo"] = "bar" }'`
+* `minetest.deserialize(string)`: returns a table
+    * Convert a string returned by `minetest.deserialize` into a table
+    * `string` is loaded in an empty sandbox environment.
+    * Will load functions, but they cannot access the global environment.
+    * Example: `deserialize('return { ["foo"] = "bar" }')`, returns `{foo='bar'}`
+    * Example: `deserialize('print("foo")')`, returns `nil` (function call fails)
+        * `error:[string "print("foo")"]:1: attempt to call global 'print' (a nil value)`
+* `minetest.compress(data, method, ...)`: returns `compressed_data`
+    * Compress a string of data.
+    * `method` is a string identifying the compression method to be used.
+    * Supported compression methods:
+    *     Deflate (zlib): `"deflate"`
+    * `...` indicates method-specific arguments.  Currently defined arguments are:
+    *     Deflate: `level` - Compression level, `0`-`9` or `nil`.
+* `minetest.decompress(compressed_data, method, ...)`: returns data
+    * Decompress a string of data (using ZLib).
+    * See documentation on `minetest.compress()` for supported compression methods.
+    * currently supported.
+    * `...` indicates method-specific arguments. Currently, no methods use this.
+* `minetest.encode_base64(string)`: returns string encoded in base64
+    * Encodes a string in base64.
+* `minetest.decode_base64(string)`: returns string
+    * Decodes a string encoded in base64.
+* `minetest.gettext(string)` : returns string
+    * look up the translation of a string in the gettext message catalog
+* `fgettext_ne(string, ...)`
+    * call minetest.gettext(string), replace "$1"..."$9" with the given
+      extra arguments and return the result
+* `fgettext(string, ...)` : returns string
+    * same as fgettext_ne(), but calls minetest.formspec_escape before returning result
+* `minetest.pointed_thing_to_face_pos(placer, pointed_thing)`: returns a position
+    * returns the exact position on the surface of a pointed node
+* `minetest.global_exists(name)`
+    * Checks if a global variable has been set, without triggering a warning.
+
+### UI
+* `minetest.ui.minimap`
+    * Reference to the minimap object. See [`Minimap`](#minimap) class reference for methods.
+    * If client disabled minimap (using enable_minimap setting) this reference will be nil.
+* `minetest.camera`
+    * Reference to the camera object. See [`Camera`](#camera) class reference for methods.
+* `minetest.show_formspec(formname, formspec)` : returns true on success
+	* Shows a formspec to the player
+* `minetest.display_chat_message(message)` returns true on success
+	* Shows a chat message to the current player.
+
+Class reference
+---------------
+
+### Minimap
+An interface to manipulate minimap on client UI
+
+* `show()`: shows the minimap (if not disabled by server)
+* `hide()`: hides the minimap
+* `set_pos(pos)`: sets the minimap position on screen
+* `get_pos()`: returns the minimap current position
+* `set_angle(deg)`: sets the minimap angle in degrees
+* `get_angle()`: returns the current minimap angle in degrees
+* `set_mode(mode)`: sets the minimap mode (0 to 6)
+* `get_mode()`: returns the current minimap mode
+* `set_shape(shape)`: Sets the minimap shape. (0 = square, 1 = round)
+* `get_shape()`: Gets the minimap shape. (0 = square, 1 = round)
+
+### Camera
+An interface to get or set information about the camera and cameranode.
+Please do not try to access the reference until the camera is initialized, otherwise the reference will be nil.
+
+#### Methods
+* `set_camera_mode(mode)`
+    * Pass `0` for first-person, `1` for third person, and `2` for third person front
+* `get_camera_mode()`
+    * Returns with same syntax as above
+* `get_fov()`
+    * Returns:
+
+```lua
+     {
+         x = number,
+         y = number,
+         max = number,
+         actual = number
+     }
+```
+
+* `get_pos()`
+    * Returns position of camera with view bobbing
+* `get_offset()`
+    * Returns eye offset vector
+* `get_look_dir()`
+    * Returns eye direction unit vector
+* `get_look_vertical()`
+    * Returns pitch in radians
+* `get_look_horizontal()`
+    * Returns yaw in radians
+* `get_aspect_ratio()`
+    * Returns aspect ratio of screen
+
+### LocalPlayer
+An interface to retrieve information about the player. The player is
+not accessible until the client is fully done loading and therefore
+not at module init time.
+
+To get the localplayer handle correctly, use `on_connect()` as follows:
+
+```lua
+local localplayer
+minetest.register_on_connect(function()
+        localplayer = minetest.localplayer
+end)
+```
+
+Methods:
+
+* `get_pos()`
+    * returns current player current position
+* `get_velocity()`
+    * returns player speed vector
+* `get_hp()`
+    * returns player HP
+* `get_name()`
+    * returns player name
+* `is_attached()`
+    * returns true if player is attached
+* `is_touching_ground()`
+    * returns true if player touching ground
+* `is_in_liquid()`
+    * returns true if player is in a liquid (This oscillates so that the player jumps a bit above the surface)
+* `is_in_liquid_stable()`
+    * returns true if player is in a stable liquid (This is more stable and defines the maximum speed of the player)
+* `get_liquid_viscosity()`
+    * returns liquid viscosity (Gets the viscosity of liquid to calculate friction)
+* `is_climbing()`
+    * returns true if player is climbing
+* `swimming_vertical()`
+    * returns true if player is swimming in vertical
+* `get_physics_override()`
+    * returns:
+
+```lua
+    {
+        speed = float,
+        jump = float,
+        gravity = float,
+        sneak = boolean,
+        sneak_glitch = boolean
+    }
+```
+
+* `get_override_pos()`
+    * returns override position
+* `get_last_pos()`
+    * returns last player position before the current client step
+* `get_last_velocity()`
+    * returns last player speed
+* `get_breath()`
+    * returns the player's breath
+* `get_movement_acceleration()`
+    * returns acceleration of the player in different environments:
+
+```lua
+    {
+       fast = float,
+       air = float,
+       default = float,
+    }
+```
+
+* `get_movement_speed()`
+    * returns player's speed in different environments:
+
+```lua
+    {
+       walk = float,
+       jump = float,
+       crouch = float,
+       fast = float,
+       climb = float,
+    }
+```
+
+* `get_movement()`
+    * returns player's movement in different environments:
+
+```lua
+    {
+       liquid_fluidity = float,
+       liquid_sink = float,
+       liquid_fluidity_smooth = float,
+       gravity = float,
+    }
+```
+
+* `get_last_look_horizontal()`:
+    * returns last look horizontal angle
+* `get_last_look_vertical()`:
+    * returns last look vertical angle
+* `get_key_pressed()`:
+    * returns last key typed by the player
+
+### Settings
+An interface to read config files in the format of `minetest.conf`.
+
+It can be created via `Settings(filename)`.
+
+#### Methods
+* `get(key)`: returns a value
+* `get_bool(key)`: returns a boolean
+* `set(key, value)`
+* `remove(key)`: returns a boolean (`true` for success)
+* `get_names()`: returns `{key1,...}`
+* `write()`: returns a boolean (`true` for success)
+    * write changes to file
+* `to_table()`: returns `{[key1]=value1,...}`
+
+### NodeMetaRef
+Node metadata: reference extra data and functionality stored in a node.
+Can be obtained via `minetest.get_meta(pos)`.
+
+#### Methods
+* `get_string(name)`
+* `get_int(name)`
+* `get_float(name)`
+* `to_table()`: returns `nil` or a table with keys:
+    * `fields`: key-value storage
+    * `inventory`: `{list1 = {}, ...}}`
+
+-----------------
+### Definitions
+* `minetest.get_node_def(nodename)`
+	* Returns [node definition](#node-definition) table of `nodename`
+* `minetest.get_item_def(itemstring)`
+	* Returns item definition table of `itemstring`
+
+#### Node Definition
+
+```lua
+	{
+		has_on_construct = bool,        -- Whether the node has the on_construct callback defined
+		has_on_destruct = bool,         -- Whether the node has the on_destruct callback defined
+		has_after_destruct = bool,      -- Whether the node has the after_destruct callback defined
+		name = string,                  -- The name of the node e.g. "air", "default:dirt"
+		groups = table,                 -- The groups of the node
+		paramtype = string,             -- Paramtype of the node
+		paramtype2 = string,            -- ParamType2 of the node
+		drawtype = string,              -- Drawtype of the node
+		mesh = <string>,                -- Mesh name if existant
+		minimap_color = <Color>,        -- Color of node on minimap *May not exist*
+		visual_scale = number,          -- Visual scale of node
+		alpha = number,                 -- Alpha of the node. Only used for liquids
+		color = <Color>,                -- Color of node *May not exist*
+		palette_name = <string>,        -- Filename of palette *May not exist*
+		palette = <{                    -- List of colors
+			Color,
+			Color
+		}>,
+		waving = number,                -- 0 of not waving, 1 if waving
+		connect_sides = number,         -- Used for connected nodes
+		connects_to = {                 -- List of nodes to connect to
+			"node1",
+			"node2"
+		},
+		post_effect_color = Color,      -- Color overlayed on the screen when the player is in the node
+		leveled = number,               -- Max level for node
+		sunlight_propogates = bool,     -- Whether light passes through the block
+		light_source = number,          -- Light emitted by the block
+		is_ground_content = bool,       -- Whether caves should cut through the node
+		walkable = bool,                -- Whether the player collides with the node
+		pointable = bool,               -- Whether the player can select the node
+		diggable = bool,                -- Whether the player can dig the node
+		climbable = bool,               -- Whether the player can climb up the node
+		buildable_to = bool,            -- Whether the player can replace the node by placing a node on it
+		rightclickable = bool,          -- Whether the player can place nodes pointing at this node
+		damage_per_second = number,     -- HP of damage per second when the player is in the node
+		liquid_type = <string>,         -- A string containing "none", "flowing", or "source" *May not exist*
+		liquid_alternative_flowing = <string>, -- Alternative node for liquid *May not exist*
+		liquid_alternative_source = <string>, -- Alternative node for liquid *May not exist*
+		liquid_viscosity = <number>,    -- How fast the liquid flows *May not exist*
+		liquid_renewable = <boolean>,   -- Whether the liquid makes an infinite source *May not exist*
+		liquid_range = <number>,        -- How far the liquid flows *May not exist*
+		drowning = bool,                -- Whether the player will drown in the node
+		floodable = bool,               -- Whether nodes will be replaced by liquids (flooded)
+		node_box = table,               -- Nodebox to draw the node with
+		collision_box = table,          -- Nodebox to set the collision area
+		selection_box = table,          -- Nodebox to set the area selected by the player
+		sounds = {                      -- Table of sounds that the block makes
+			sound_footstep = SimpleSoundSpec,
+			sound_dig = SimpleSoundSpec,
+			sound_dug = SimpleSoundSpec
+		},
+		legacy_facedir_simple = bool,   -- Whether to use old facedir
+		legacy_wallmounted = bool       -- Whether to use old wallmounted
+	}
+```
+
+#### Item Definition
+
+```lua
+	{
+		name = string,                  -- Name of the item e.g. "default:stone"
+		description = string,           -- Description of the item e.g. "Stone"
+		type = string,                  -- Item type: "none", "node", "craftitem", "tool"
+		inventory_image = string,       -- Image in the inventory
+		wield_image = string,           -- Image in wieldmesh
+		palette_image = string,         -- Image for palette
+		color = Color,                  -- Color for item
+		wield_scale = Vector,           -- Wieldmesh scale
+		stack_max = number,             -- Number of items stackable together
+		usable = bool,                  -- Has on_use callback defined
+		liquids_pointable = bool,       -- Whether you can point at liquids with the item
+		tool_capabilities = <table>,    -- If the item is a tool, tool capabiltites of the item
+		groups = table,                 -- Groups of the item
+		sound_place = SimpleSoundSpec,  -- Sound played when placed
+		sound_place_failed = SimpleSoundSpec, -- Sound played when placement failed
+		node_placement_prediction = string -- Node placed in client until server catches up
+	}
+```
+-----------------
+
+### Chat command definition (`register_chatcommand`)
+
+    {
+        params = "<name> <privilege>", -- Short parameter description
+        description = "Remove privilege from player", -- Full description
+        func = function(param),        -- Called when command is run.
+                                       -- Returns boolean success and text output.
+    }
+### Server info
+```lua
+{
+	address = "minetest.example.org", -- The domain name/IP address of a remote server or "" for a local server.
+	ip = "203.0.113.156",             -- The IP address of the server.
+	port = 30000,                     -- The port the client is connected to.
+	protocol_version = 30             -- Will not be accurate at start up as the client might not be connected to the server yet, in that case it will be 0.
+}
+```
+
+Escape sequences
+----------------
+Most text can contain escape sequences, that can for example color the text.
+There are a few exceptions: tab headers, dropdowns and vertical labels can't.
+The following functions provide escape sequences:
+* `minetest.get_color_escape_sequence(color)`:
+    * `color` is a [ColorString](#colorstring)
+    * The escape sequence sets the text color to `color`
+* `minetest.colorize(color, message)`:
+    * Equivalent to:
+      `minetest.get_color_escape_sequence(color) ..
+       message ..
+       minetest.get_color_escape_sequence("#ffffff")`
+* `color.get_background_escape_sequence(color)`
+    * `color` is a [ColorString](#colorstring)
+    * The escape sequence sets the background of the whole text element to
+      `color`. Only defined for item descriptions and tooltips.
+* `color.strip_foreground_colors(str)`
+    * Removes foreground colors added by `get_color_escape_sequence`.
+* `color.strip_background_colors(str)`
+    * Removes background colors added by `get_background_escape_sequence`.
+* `color.strip_colors(str)`
+    * Removes all color escape sequences.
+
+`ColorString`
+-------------
+`#RGB` defines a color in hexadecimal format.
+
+`#RGBA` defines a color in hexadecimal format and alpha channel.
+
+`#RRGGBB` defines a color in hexadecimal format.
+
+`#RRGGBBAA` defines a color in hexadecimal format and alpha channel.
+
+Named colors are also supported and are equivalent to
+[CSS Color Module Level 4](http://dev.w3.org/csswg/css-color/#named-colors).
+To specify the value of the alpha channel, append `#AA` to the end of the color name
+(e.g. `colorname#08`). For named colors the hexadecimal string representing the alpha
+value must (always) be two hexadecimal digits.
+
+`Color`
+-------------
+`{a = alpha, r = red, g = green, b = blue}` defines an ARGB8 color.
diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 34c64b8df..ae8263c6c 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -1,4 +1,4 @@
-Minetest Lua Modding API Reference 0.4.15
+Minetest Lua Modding API Reference 0.4.16
 =========================================
 * More information at <http://www.minetest.net/>
 * Developer Wiki: <http://dev.minetest.net/>
@@ -172,8 +172,8 @@ The main Lua script. Running this script should register everything it
 wants to register. Subsequent execution depends on minetest calling the
 registered callbacks.
 
-`minetest.setting_get(name)` and `minetest.setting_getbool(name)` can be used
-to read custom or existing settings at load time, if necessary.
+`minetest.settings` can be used to read custom or existing settings at load
+time, if necessary. (See `Settings`)
 
 ### `models`
 Models for entities or meshnodes.
@@ -186,7 +186,11 @@ Naming convention for registered textual names
 ----------------------------------------------
 Registered names should generally be in this format:
 
-    "modname:<whatever>" (<whatever> can have characters a-zA-Z0-9_)
+    `modname:<whatever>`
+
+`<whatever>` can have these characters:
+
+    a-zA-Z0-9_
 
 This is to prevent conflicting names from corrupting maps and is
 enforced by the mod loader.
@@ -209,7 +213,7 @@ The `:` prefix can also be used for maintaining backwards compatibility.
 
 ### Aliases
 Aliases can be added by using `minetest.register_alias(name, convert_to)` or
-`minetest.register_alias_force(name, convert_to).
+`minetest.register_alias_force(name, convert_to)`.
 
 This will make Minetest to convert things called name to things called
 `convert_to`.
@@ -309,10 +313,10 @@ Example:
     default_sandstone.png^[resize:16x16
 
 #### `[opacity:<r>`
-    Makes the base image transparent according to the given ratio.
-    r must be between 0 and 255.
-    0 means totally transparent.
-    255 means totally opaque.
+Makes the base image transparent according to the given ratio.
+
+`r` must be between 0 and 255.
+0 means totally transparent. 255 means totally opaque.
 
 Example:
 
@@ -403,6 +407,11 @@ Apply a mask to the base image.
 
 The mask is applied using binary AND.
 
+#### `[sheet:<w>x<h>:<x>,<y>`
+Retrieves a tile at position x,y from the base image
+which it assumes to be a tilesheet with dimensions w,h.
+
+
 #### `[colorize:<color>:<ratio>`
 Colorize the textures with the given color.
 `<color>` is specified as a `ColorString`.
@@ -414,6 +423,174 @@ the word "`alpha`", then each texture pixel will contain the RGB of
 `<color>` and the alpha of `<color>` multiplied by the alpha of the
 texture pixel.
 
+#### `[multiply:<color>`
+Multiplies texture colors with the given color.
+`<color>` is specified as a `ColorString`.
+Result is more like what you'd expect if you put a color on top of another
+color. Meaning white surfaces get a lot of your new color while black parts don't
+change very much.
+
+Hardware coloring
+-----------------
+The goal of hardware coloring is to simplify the creation of
+colorful nodes. If your textures use the same pattern, and they only
+differ in their color (like colored wool blocks), you can use hardware
+coloring instead of creating and managing many texture files.
+All of these methods use color multiplication (so a white-black texture
+with red coloring will result in red-black color).
+
+### Static coloring
+This method is useful if you wish to create nodes/items with
+the same texture, in different colors, each in a new node/item definition.
+
+#### Global color
+When you register an item or node, set its `color` field (which accepts a
+`ColorSpec`) to the desired color.
+
+An `ItemStack`s static color can be overwritten by the `color` metadata
+field. If you set that field to a `ColorString`, that color will be used.
+
+#### Tile color
+Each tile may have an individual static color, which overwrites every
+other coloring methods. To disable the coloring of a face,
+set its color to white (because multiplying with white does nothing).
+You can set the `color` property of the tiles in the node's definition
+if the tile is in table format.
+
+### Palettes
+For nodes and items which can have many colors, a palette is more
+suitable. A palette is a texture, which can contain up to 256 pixels.
+Each pixel is one possible color for the node/item.
+You can register one node/item, which can have up to 256 colors.
+
+#### Palette indexing
+When using palettes, you always provide a pixel index for the given
+node or `ItemStack`. The palette is read from left to right and from
+top to bottom. If the palette has less than 256 pixels, then it is
+stretched to contain exactly 256 pixels (after arranging the pixels
+to one line). The indexing starts from 0.
+
+Examples:
+* 16x16 palette, index = 0: the top left corner
+* 16x16 palette, index = 4: the fifth pixel in the first row
+* 16x16 palette, index = 16: the pixel below the top left corner
+* 16x16 palette, index = 255: the bottom right corner
+* 2 (width)x4 (height) palette, index=31: the top left corner.
+  The palette has 8 pixels, so each pixel is stretched to 32 pixels,
+  to ensure the total 256 pixels.
+* 2x4 palette, index=32: the top right corner
+* 2x4 palette, index=63: the top right corner
+* 2x4 palette, index=64: the pixel below the top left corner
+
+#### Using palettes with items
+When registering an item, set the item definition's `palette` field to
+a texture. You can also use texture modifiers.
+
+The `ItemStack`'s color depends on the `palette_index` field of the
+stack's metadata. `palette_index` is an integer, which specifies the
+index of the pixel to use.
+
+#### Linking palettes with nodes
+When registering a node, set the item definition's `palette` field to
+a texture. You can also use texture modifiers.
+The node's color depends on its `param2`, so you also must set an
+appropriate `drawtype`:
+* `drawtype = "color"` for nodes which use their full `param2` for
+  palette indexing. These nodes can have 256 different colors.
+  The palette should contain 256 pixels.
+* `drawtype = "colorwallmounted"` for nodes which use the first
+  five bits (most significant) of `param2` for palette indexing.
+  The remaining three bits are describing rotation, as in `wallmounted`
+  draw type. Division by 8 yields the palette index (without stretching the
+  palette). These nodes can have 32 different colors, and the palette
+  should contain 32 pixels.
+  Examples:
+  * `param2 = 17` is 2 * 8 + 1, so the rotation is 1 and the third (= 2 + 1)
+    pixel will be picked from the palette.
+  * `param2 = 35` is 4 * 8 + 3, so the rotation is 3 and the fifth (= 4 + 1)
+    pixel will be picked from the palette.
+* `drawtype = "colorfacedir"` for nodes which use the first
+  three bits of `param2` for palette indexing. The remaining
+  five bits are describing rotation, as in `facedir` draw type.
+  Division by 32 yields the palette index (without stretching the
+  palette). These nodes can have 8 different colors, and the
+  palette should contain 8 pixels.
+  Examples:
+  * `param2 = 17` is 0 * 32 + 17, so the rotation is 17 and the
+    first (= 0 + 1) pixel will be picked from the palette.
+  * `param2 = 35` is 1 * 32 + 3, so the rotation is 3 and the
+    second (= 1 + 1) pixel will be picked from the palette.
+
+To colorize a node on the map, set its `param2` value (according
+to the node's draw type).
+
+### Conversion between nodes in the inventory and the on the map
+Static coloring is the same for both cases, there is no need
+for conversion.
+
+If the `ItemStack`'s metadata contains the `color` field, it will be
+lost on placement, because nodes on the map can only use palettes.
+
+If the `ItemStack`'s metadata contains the `palette_index` field, you
+currently must manually convert between it and the node's `param2` with
+custom `on_place` and `on_dig` callbacks.
+
+### Colored items in craft recipes
+Craft recipes only support item strings, but fortunately item strings
+can also contain metadata. Example craft recipe registration:
+
+    local stack = ItemStack("wool:block")
+    dyed:get_meta():set_int("palette_index", 3) -- add index
+    minetest.register_craft({
+        output = dyed:to_string(), -- convert to string
+        type = "shapeless",
+        recipe = {
+            "wool:block",
+            "dye:red",
+        },
+    })
+
+Metadata field filtering in the `recipe` field are not supported yet,
+so the craft output is independent of the color of the ingredients.
+
+Soft texture overlay
+--------------------
+Sometimes hardware coloring is not enough, because it affects the
+whole tile. Soft texture overlays were added to Minetest to allow
+the dynamic coloring of only specific parts of the node's texture.
+For example a grass block may have colored grass, while keeping the
+dirt brown.
+
+These overlays are 'soft', because unlike texture modifiers, the layers
+are not merged in the memory, but they are simply drawn on top of each
+other. This allows different hardware coloring, but also means that
+tiles with overlays are drawn slower. Using too much overlays might
+cause FPS loss.
+
+To define an overlay, simply set the `overlay_tiles` field of the node
+definition. These tiles are defined in the same way as plain tiles:
+they can have a texture name, color etc.
+To skip one face, set that overlay tile to an empty string.
+
+Example (colored grass block):
+
+    minetest.register_node("default:dirt_with_grass", {
+        description = "Dirt with Grass",
+        -- Regular tiles, as usual
+        -- The dirt tile disables palette coloring
+        tiles = {{name = "default_grass.png"}, 
+            {name = "default_dirt.png", color = "white"}},
+        -- Overlay tiles: define them in the same style
+        -- The top and bottom tile does not have overlay
+        overlay_tiles = {"", "",
+            {name = "default_grass_side.png", tileable_vertical = false}},
+        -- Global color, used in inventory
+        color = "green",
+        -- Palette in the world
+        paramtype2 = "color",
+        palette = "default_foilage.png",
+    })
+
 Sounds
 ------
 Only Ogg Vorbis files are supported.
@@ -444,11 +621,13 @@ Examples of sound parameter tables:
     -- Play locationless on all clients
     {
         gain = 1.0, -- default
+        fade = 0.0, -- default, change to a value > 0 to fade the sound in
     }
     -- Play locationless to one player
     {
         to_player = name,
         gain = 1.0, -- default
+        fade = 0.0, -- default, change to a value > 0 to fade the sound in
     }
     -- Play locationless to one player, looped
     {
@@ -501,7 +680,7 @@ the global `minetest.registered_*` tables.
 * `minetest.unregister_item(name)`
     * Unregisters the item name from engine, and deletes the entry with key
     * `name` from `minetest.registered_items` and from the associated item
-    * table according to its nature: minetest.registered_nodes[] etc
+    * table according to its nature: `minetest.registered_nodes[]` etc
 
 * `minetest.register_biome(biome definition)`
     * returns an integer uniquely identifying the registered biome
@@ -579,9 +758,9 @@ They are represented by a table:
 
     {name="name", param1=num, param2=num}
 
-`param1` and `param2` are 8-bit integers. The engine uses them for certain
-automated functions. If you don't use these functions, you can use them to
-store arbitrary values.
+`param1` and `param2` are 8-bit integers ranging from 0 to 255. The engine uses
+them for certain automated functions. If you don't use these functions, you can
+use them to store arbitrary values.
 
 The functions of `param1` and `param2` are determined by certain fields in the
 node definition:
@@ -633,15 +812,23 @@ node definition:
         bit 4 (0x10) - Makes the plant mesh 1.4x larger
         bit 5 (0x20) - Moves each face randomly a small bit down (1/8 max)
         bits 6-7 are reserved for future use.
-    collision_box = {
-      type = "fixed",
-      fixed = {
-                {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
-      },
-    },
-    ^ defines list of collision boxes for the node. If empty, collision boxes
-      will be the same as nodeboxes, in case of any other nodes will be full cube
-      as in the example above.
+    paramtype2 == "color"
+    ^ `param2` tells which color is picked from the palette.
+      The palette should have 256 pixels.
+    paramtype2 == "colorfacedir"
+    ^ Same as `facedir`, but with colors.
+      The first three bits of `param2` tells which color
+      is picked from the palette.
+      The palette should have 8 pixels.
+    paramtype2 == "colorwallmounted"
+    ^ Same as `wallmounted`, but with colors.
+      The first five bits of `param2` tells which color
+      is picked from the palette.
+      The palette should have 32 pixels.
+    paramtype2 == "glasslikeliquidlevel"
+    ^ Only valid for "glasslike_framed" or "glasslike_framed_optional" drawtypes.
+      param2 defines 64 levels of internal liquid.
+      Liquid texture is defined using `special_tiles = {"modname_tilename.png"},`
 
 Nodes can also contain extra data. See "Node Metadata".
 
@@ -792,6 +979,7 @@ If no flags are specified (or defaults is), 2D noise is eased and 3D noise is no
 Accumulates the absolute value of each noise gradient result.
 
 Noise parameters format example for 2D or 3D perlin noise or perlin noise maps:
+
     np_terrain = {
         offset = 0,
         scale = 1,
@@ -802,8 +990,8 @@ Noise parameters format example for 2D or 3D perlin noise or perlin noise maps:
         lacunarity = 2.0,
         flags = "defaults, absvalue"
     }
-  ^ A single noise parameter table can be used to get 2D or 3D noise,
-    when getting 2D noise spread.z is ignored.
+    ^ A single noise parameter table can be used to get 2D or 3D noise,
+      when getting 2D noise spread.z is ignored.
 
 
 Ore types
@@ -875,14 +1063,15 @@ to small changes.  The following is a decent set of parameters to work from:
 	},
 	noise_threshold = 1.6
 
-WARNING:  Use this ore type *very* sparingly since it is ~200x more
+**WARNING**: Use this ore type *very* sparingly since it is ~200x more
 computationally expensive than any other ore.
 
 Ore attributes
 --------------
 See section "Flag Specifier Format".
 
-Currently supported flags: `absheight`
+Currently supported flags:
+`absheight`, `puff_cliffs`, `puff_additive_composition`.
 
 ### `absheight`
 Also produce this same ore between the height range of `-y_max` and `-y_min`.
@@ -938,6 +1127,7 @@ in the form of a table.  This table specifies the following fields:
      previous contents (default: false)
 
 About probability values:
+
 * A probability value of `0` or `1` means that node will never appear (0% chance).
 * A probability value of `254` or `255` means the node will always appear (100% chance).
 * If the probability value `p` is greater than `1`, then there is a
@@ -1092,16 +1282,32 @@ There are three kinds of items: nodes, tools and craftitems.
   things according to `tool_capabilities`.
 * Craftitem (`register_craftitem`): A miscellaneous item.
 
+### Amount and wear
+All item stacks have an amount between 0 to 65535. It is 1 by
+default. Tool item stacks can not have an amount greater than 1.
+
+Tools use a wear (=damage) value ranging from 0 to 65535. The
+value 0 is the default and used is for unworn tools. The values
+1 to 65535 are used for worn tools, where a higher value stands for
+a higher wear. Non-tools always have a wear value of 0.
+
 ### Item formats
 Items and item stacks can exist in three formats: Serializes, table format
 and `ItemStack`.
 
 #### Serialized
-This is called "stackstring" or "itemstring":
+This is called "stackstring" or "itemstring". It is a simple string with
+1-3 components: the full item identifier, an optional amount and an optional
+wear value. Syntax:
 
-* e.g. `'default:dirt 5'`
-* e.g. `'default:pick_wood 21323'`
-* e.g. `'default:apple'`
+    <identifier> [<amount>[ <wear>]]
+
+Examples:
+
+* `'default:apple'`: 1 apple
+* `'default:dirt 5'`: 5 dirt
+* `'default:pick_stone'`: a new stone pickaxe
+* `'default:pick_wood 1 21323'`: a wooden pickaxe, ca. 1/3 worn out
 
 #### Table format
 Examples:
@@ -1195,16 +1401,18 @@ Another example: Make red wool from white wool and red dye:
 
 ### Special groups
 * `immortal`: Disables the group damage system for an entity
+* `punch_operable`: For entities; disables the regular damage mechanism for
+  players punching it by hand or a non-tool item, so that it can do something
+  else than take damage.
 * `level`: Can be used to give an additional sense of progression in the game.
      * A larger level will cause e.g. a weapon of a lower level make much less
        damage, and get worn out much faster, or not be able to get drops
        from destroyed nodes.
      * `0` is something that is directly accessible at the start of gameplay
      * There is no upper limit
-* `dig_immediate`: (player can always pick up node without tool wear)
-    * `2`: node is removed without tool wear after 0.5 seconds or so
-      (rail, sign)
-    * `3`: node is removed without tool wear immediately (torch)
+* `dig_immediate`: (player can always pick up node without reducing tool wear)
+    * `2`: the node always gets the digging time 0.5 seconds (rail, sign)
+    * `3`: the node always gets the digging time 0 seconds (torch)
 * `disable_jump`: Player (and possibly other things) cannot jump from node
 * `fall_damage_add_percent`: damage speed = `speed * (1 + value/100)`
 * `bouncy`: value is bounce speed in percent
@@ -1234,6 +1442,7 @@ Another example: Make red wool from white wool and red dye:
 
 ### Examples of custom groups
 Item groups are often used for defining, well, _groups of items_.
+
 * `meat`: any meat-kind of a thing (rating might define the size or healing
   ability or be irrelevant -- it is not defined as of yet)
 * `eatable`: anything that can be eaten. Rating might define HP gain in half
@@ -1305,6 +1514,10 @@ result in the tool to be able to dig nodes that have a rating of `2` or `3`
 for this group, and unable to dig the rating `1`, which is the toughest.
 Unless there is a matching group that enables digging otherwise.
 
+If the result digging time is 0, a delay of 0.15 seconds is added between
+digging nodes; If the player releases LMB after digging, this delay is set to 0,
+i.e. players can more quickly click the nodes away instead of holding LMB.
+
 #### Damage groups
 List of damage for groups of entities. See "Entity damage mechanism".
 
@@ -1374,7 +1587,7 @@ a non-tool item, so that it can do something else than take damage.
 
 On the Lua side, every punch calls:
 
-    entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
+    entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction, damage)
 
 This should never be called directly, because damage is usually not handled by
 the entity itself.
@@ -1385,6 +1598,9 @@ the entity itself.
 * `tool_capabilities` can be `nil`.
 * `direction` is a unit vector, pointing from the source of the punch to
    the punched object.
+* `damage` damage that will be done to entity
+Return value of this function will determin if damage is done by this function
+(retval true) or shall be done by engine (retval false)
 
 To punch an entity/object in Lua, call:
 
@@ -1399,9 +1615,9 @@ Node Metadata
 -------------
 The instance of a node in the world normally only contains the three values
 mentioned in "Nodes". However, it is possible to insert extra data into a
-node. It is called "node metadata"; See "`NodeMetaRef`".
+node. It is called "node metadata"; See `NodeMetaRef`.
 
-Metadata contains two things:
+Node metadata contains two things:
 
 * A key-value store
 * An inventory
@@ -1439,6 +1655,25 @@ Example stuff:
         }
     })
 
+Item Metadata
+-------------
+Item stacks can store metadata too. See `ItemStackMetaRef`.
+
+Item metadata only contains a key-value store.
+
+Some of the values in the key-value store are handled specially:
+
+* `description`: Set the item stack's description. Defaults to `idef.description`
+* `color`: A `ColorString`, which sets the stack's color.
+* `palette_index`: If the item has a palette, this is used to get the
+                  current color from the palette.
+
+Example stuff:
+
+    local meta = stack:get_meta()
+    meta:set_string("key", "value")
+    print(dump(meta:to_table()))
+
 Formspec
 --------
 Formspec defines a menu. Currently not much else than inventories are
@@ -1478,9 +1713,19 @@ examples.
 * `fixed_size`: `true`/`false` (optional)
 * deprecated: `invsize[<W>,<H>;]`
 
+#### `position[<X>,<Y>]`
+* Define the position of the formspec
+* A value between 0.0 and 1.0 represents a position inside the screen
+* The default value is the center of the screen (0.5, 0.5)
+
+#### `anchor[<X>,<Y>]`
+* Define the anchor of the formspec
+* A value between 0.0 and 1.0 represents an anchor inside the formspec
+* The default value is the center of the formspec (0.5, 0.5)
+
 #### `container[<X>,<Y>]`
 * Start of a container block, moves all physical elements in the container by (X, Y)
-* Must have matching container_end
+* Must have matching `container_end`
 * Containers can be nested, in which case the offsets are added
   (child containers are relative to parent containers)
 
@@ -1520,7 +1765,7 @@ examples.
 * Sets default background color of tooltips
 * Sets default font color of tooltips
 
-#### `tooltip[<gui_element_name>;<tooltip_text>;<bgcolor>,<fontcolor>]`
+#### `tooltip[<gui_element_name>;<tooltip_text>;<bgcolor>;<fontcolor>]`
 * Adds tooltip for an element
 * `<bgcolor>` tooltip background color as `ColorString` (optional)
 * `<fontcolor>` tooltip font color as `ColorString` (optional)
@@ -1565,7 +1810,7 @@ examples.
 
 #### `field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]`
 * Textual field; will be sent to server when a button is clicked
-* When enter is pressed in field, fields.key_enter_field will be sent with the name
+* When enter is pressed in field, `fields.key_enter_field` will be sent with the name
   of this field.
 * `x` and `y` position the field relative to the top left of the menu
 * `w` and `h` are the size of the field
@@ -1577,16 +1822,16 @@ examples.
     * `default` may contain variable references such as `${text}'` which
       will fill the value from the metadata value `text`
     * **Note**: no extra text or more than a single variable is supported ATM.
-* See field_close_on_enter to stop enter closing the formspec
+* See `field_close_on_enter` to stop enter closing the formspec
 
 #### `field[<name>;<label>;<default>]`
 * As above, but without position/size units
-* When enter is pressed in field, fields.key_enter_field will be sent with the name
+* When enter is pressed in field, `fields.key_enter_field` will be sent with the name
   of this field.
 * Special field for creating simple forms, such as sign text input
 * Must be used without a `size[]` element
 * A "Proceed" button will be added automatically
-* See field_close_on_enter to stop enter closing the formspec
+* See `field_close_on_enter` to stop enter closing the formspec
 
 #### `field_close_on_enter[<name>;<close_on_enter>]`
 * <name> is the name of the field
@@ -1806,18 +2051,25 @@ Escape sequences
 Most text can contain escape sequences, that can for example color the text.
 There are a few exceptions: tab headers, dropdowns and vertical labels can't.
 The following functions provide escape sequences:
-* `core.get_color_escape_sequence(color)`:
+
+* `minetest.get_color_escape_sequence(color)`:
     * `color` is a ColorString
     * The escape sequence sets the text color to `color`
-* `core.colorize(color, message)`:
+* `minetest.colorize(color, message)`:
     * Equivalent to:
-      `core.get_color_escape_sequence(color) ..
+      `minetest.get_color_escape_sequence(color) ..
        message ..
-       core.get_color_escape_sequence("#ffffff")`
+       minetest.get_color_escape_sequence("#ffffff")`
 * `color.get_background_escape_sequence(color)`
     * `color` is a ColorString
     * The escape sequence sets the background of the whole text element to
       `color`. Only defined for item descriptions and tooltips.
+* `color.strip_foreground_colors(str)`
+    * Removes foreground colors added by `get_color_escape_sequence`.
+* `color.strip_background_colors(str)`
+    * Removes background colors added by `get_background_escape_sequence`.
+* `color.strip_colors(str)`
+    * Removes all color escape sequences.
 
 Spatial Vectors
 ---------------
@@ -1832,6 +2084,7 @@ Spatial Vectors
 * `vector.round(v)`: returns a vector, each dimension rounded to nearest int
 * `vector.apply(v, func)`: returns a vector
 * `vector.equals(v1, v2)`: returns a boolean
+* `vector.sort(v1, v2)`: returns minp, maxp vectors of the cuboid defined by v1 and v2
 
 For the following functions `x` can be either a vector or a number:
 
@@ -1852,14 +2105,16 @@ Helper functions
 * `math.sign(x, tolerance)`
     * Get the sign of a number.
       Optional: Also returns `0` when the absolute value is within the tolerance (default: `0`)
-* `string.split(str, separator=",", include_empty=false, max_splits=-1,
-* sep_is_pattern=false)`
+* `string.split(str, separator=",", include_empty=false, max_splits=-1, sep_is_pattern=false)`
     * If `max_splits` is negative, do not limit splits.
     * `sep_is_pattern` specifies if separator is a plain string or a pattern (regex).
     * e.g. `string:split("a,b", ",") == {"a","b"}`
 * `string:trim()`
     * e.g. `string.trim("\n \t\tfoo bar\t ") == "foo bar"`
-* `minetest.pos_to_string({x=X,y=Y,z=Z}, decimal_places))`: returns `"(X,Y,Z)"`
+* `minetest.wrap_text(str, limit)`: returns a string
+    * Adds new lines to the string to keep it within the specified character limit
+    * limit: Maximal amount of characters in one line
+* `minetest.pos_to_string({x=X,y=Y,z=Z}, decimal_places))`: returns string `"(X,Y,Z)"`
     * Convert position to a printable string
       Optional: 'decimal_places' will round the x, y and z of the pos to the given decimal place.
 * `minetest.string_to_pos(string)`: returns a position
@@ -1869,11 +2124,13 @@ Helper functions
 * `minetest.formspec_escape(string)`: returns a string
     * escapes the characters "[", "]", "\", "," and ";", which can not be used in formspecs
 * `minetest.is_yes(arg)`
-    * returns whether `arg` can be interpreted as yes
+    * returns true if passed 'y', 'yes', 'true' or a number that isn't zero.
 * `minetest.get_us_time()`
     * returns time with microsecond precision. May not return wall time.
 * `table.copy(table)`: returns a table
     * returns a deep copy of `table`
+* `minetest.pointed_thing_to_face_pos(placer, pointed_thing)`: returns a position
+    * returns the exact position on the surface of a pointed node
 
 `minetest` namespace reference
 ------------------------------
@@ -1888,34 +2145,52 @@ Helper functions
 * `minetest.get_worldpath()`: returns e.g. `"/home/user/.minetest/world"`
     * Useful for storing custom data
 * `minetest.is_singleplayer()`
-* `minetest.features`
-    * Table containing API feature flags: `{foo=true, bar=true}`
+* `minetest.features`: Table containing API feature flags
+
+        {
+           glasslike_framed = true,
+           nodebox_as_selectionbox = true,
+           chat_send_player_param3 = true,
+           get_all_craft_recipes_works = true,
+           use_texture_alpha = true,
+        -- ^ The transparency channel of textures can be used optionally
+           no_legacy_abms = true,
+        -- ^ Tree and grass ABMs are no longer done from C++
+           texture_names_parens = true,
+        -- ^ Texture grouping is possible using parentheses
+           area_store_custom_ids = true,
+        -- ^ Unique Area ID for AreaStore:insert_area
+           add_entity_with_staticdata = true,
+        -- ^ add_entity supports passing initial staticdata to on_activate
+           no_chat_message_prediction = true,
+        -- ^ Chat messages are no longer predicted
+        }
 * `minetest.has_feature(arg)`: returns `boolean, missing_features`
     * `arg`: string or table in format `{foo=true, bar=true}`
     * `missing_features`: `{foo=true, bar=true}`
-* `minetest.get_player_information(player_name)`: returns a table containing
-  information about player. Example return value:
-        {
-            address = "127.0.0.1",     -- IP address of client
-            ip_version = 4,            -- IPv4 / IPv6
-            min_rtt = 0.01,            -- minimum round trip time
-            max_rtt = 0.2,             -- maximum round trip time
-            avg_rtt = 0.02,            -- average round trip time
-            min_jitter = 0.01,         -- minimum packet time jitter
-            max_jitter = 0.5,          -- maximum packet time jitter
-            avg_jitter = 0.03,         -- average packet time jitter
-            connection_uptime = 200,   -- seconds since client connected
-
-            -- following information is available on debug build only!!!
-            -- DO NOT USE IN MODS
-            --ser_vers = 26,             -- serialization version used by client
-            --prot_vers = 23,            -- protocol version used by client
-            --major = 0,                 -- major version number
-            --minor = 4,                 -- minor version number
-            --patch = 10,                -- patch version number
-            --vers_string = "0.4.9-git", -- full version string
-            --state = "Active"           -- current client state
-        }
+* `minetest.get_player_information(player_name)`:
+    * Returns a table containing information about a player. Example return value:
+
+            {
+                address = "127.0.0.1",     -- IP address of client
+                ip_version = 4,            -- IPv4 / IPv6
+                min_rtt = 0.01,            -- minimum round trip time
+                max_rtt = 0.2,             -- maximum round trip time
+                avg_rtt = 0.02,            -- average round trip time
+                min_jitter = 0.01,         -- minimum packet time jitter
+                max_jitter = 0.5,          -- maximum packet time jitter
+                avg_jitter = 0.03,         -- average packet time jitter
+                connection_uptime = 200,   -- seconds since client connected
+                prot_vers = 31,            -- protocol version used by client
+                -- following information is available on debug build only!!!
+                -- DO NOT USE IN MODS
+                --ser_vers = 26,             -- serialization version used by client
+                --major = 0,                 -- major version number
+                --minor = 4,                 -- minor version number
+                --patch = 10,                -- patch version number
+                --vers_string = "0.4.9-git", -- full version string
+                --state = "Active"           -- current client state
+            }
 * `minetest.mkdir(path)`: returns success.
     * Creates a directory specified by `path`, creating parent directories
       if they don't exist.
@@ -1934,7 +2209,7 @@ Helper functions
   reliable or verifyable. Compatible forks will have a different name and
   version entirely. To check for the presence of engine features, test
   whether the functions exported by the wanted features exist. For example:
-  `if core.nodeupdate then ... end`.
+  `if minetest.nodeupdate then ... end`.
 
 ### Logging
 * `minetest.debug(...)`
@@ -1962,7 +2237,7 @@ Call these functions only at load time!
     * Specify either output or input only. If you specify both, input will be ignored. For input use the same recipe table
       syntax as for `minetest.register_craft(recipe)`. For output specify only the item, without a quantity.
     * If no erase candidate could be found, Lua exception will be thrown.
-    * Warning! The type field ("shaped","cooking" or any other) will be ignored if the recipe
+    * **Warning**! The type field ("shaped","cooking" or any other) will be ignored if the recipe
       contains output. Erasing is then done independently from the crafting method.
 * `minetest.register_ore(ore definition)`
 * `minetest.register_biome(biome definition)`
@@ -2017,7 +2292,7 @@ Call these functions only at load time!
     * Called when the player gets damaged or healed
     * `player`: ObjectRef of the player
     * `hp_change`: the amount of change. Negative when it is damage.
-    * `modifier`: when true, the function should return the actual hp_change.
+    * `modifier`: when true, the function should return the actual `hp_change`.
       Note: modifiers only get a temporary hp_change that can be modified by later modifiers.
       modifiers can return true as a second argument to stop the execution of further functions.
       Non-modifiers receive the final hp change calculated by the modifiers.
@@ -2036,9 +2311,10 @@ Call these functions only at load time!
 * `minetest.register_on_cheat(func(ObjectRef, cheat))`
     * Called when a player cheats
     * `cheat`: `{type=<cheat_type>}`, where `<cheat_type>` is one of:
-        * `"moved_too_fast"`
-        * `"interacted_too_far"`
-        * `"finished_unknown_dig"`
+        * `moved_too_fast`
+        * `interacted_too_far`
+        * `interacted_while_dead`
+        * `finished_unknown_dig`
         * `dug_unbreakable`
         * `dug_too_fast`
 * `minetest.register_on_chat_message(func(name, message))`
@@ -2070,25 +2346,24 @@ Call these functions only at load time!
 
 ### Other registration functions
 * `minetest.register_chatcommand(cmd, chatcommand definition)`
+    * Adds definition to `minetest.registered_chatcommands`
+* `minetest.override_chatcommand(name, redefinition)`
+    * Overrides fields of a chatcommand registered with `register_chatcommand`.
+* `minetest.unregister_chatcommand(name)`
+    * Unregisters a chatcommands registered with `register_chatcommand`.
 * `minetest.register_privilege(name, definition)`
     * `definition`: `"description text"`
     * `definition`: `{ description = "description text", give_to_singleplayer = boolean}`
       the default of `give_to_singleplayer` is true
-    * To allow players with basic_privs to grant, see basic_privs minetest.conf setting.
+    * To allow players with `basic_privs` to grant, see `basic_privs` minetest.conf setting.
 * `minetest.register_authentication_handler(handler)`
     * See `minetest.builtin_auth_handler` in `builtin.lua` for reference
 
 ### Setting-related
-* `minetest.setting_set(name, value)`
-    * Setting names can't contain whitespace or any of `="{}#`.
-    * Setting values can't contain the sequence `\n"""`.
-    * Setting names starting with "secure." can't be set.
-* `minetest.setting_get(name)`: returns string or `nil`
-* `minetest.setting_setbool(name, value)`
-    * See documentation on `setting_set` for restrictions.
-* `minetest.setting_getbool(name)`: returns boolean or `nil`
-* `minetest.setting_get_pos(name)`: returns position or nil
-* `minetest.setting_save()`, returns `nil`, save all settings to config file
+* `minetest.settings`: Settings object containing all of the settings from the
+  main config file (`minetest.conf`).
+* `minetest.setting_get_pos(name)`: Loads a setting from the main settings and
+  parses it as a position (in the format `(1,2,3)`). Returns a position or nil.
 
 ### Authentication
 * `minetest.notify_authentication_modified(name)`
@@ -2108,7 +2383,7 @@ Call these functions only at load time!
     * on comparing the password hash in the database with the password hash
     * from the function, with an externally provided password, as the hash
     * in the db might use the new SRP verifier format.
-    * For this purpose, use minetest.check_password_entry instead.
+    * For this purpose, use `minetest.check_password_entry` instead.
 * `minetest.string_to_privs(str)`: returns `{priv1=true,...}`
 * `minetest.privs_to_string(privs)`: returns `"priv1,priv2,..."`
     * Convert between two privilege representations
@@ -2158,6 +2433,9 @@ and `minetest.auth_reload` call the authetification handler.
     * Returns `true` if successful, `false` on failure (e.g. protected location)
 * `minetest.punch_node(pos)`
     * Punch node with the same effects that a player would cause
+* `minetest.spawn_falling_node(pos)`
+    * Change node into falling node
+    * Returns `true` if successful, `false` on failure
 
 * `minetest.find_nodes_with_meta(pos1, pos2)`
     * Get a table of positions of nodes that have metadata within a region {pos1, pos2}
@@ -2166,7 +2444,7 @@ and `minetest.auth_reload` call the authetification handler.
 * `minetest.get_node_timer(pos)`
     * Get `NodeTimerRef`
 
-* `minetest.add_entity(pos, name)`: Spawn Lua-defined entity at position
+* `minetest.add_entity(pos, name, [staticdata])`: Spawn Lua-defined entity at position
     * Returns `ObjectRef`, or `nil` if failed
 * `minetest.add_item(pos, item)`: Spawn item
     * Returns `ObjectRef`, or `nil` if failed
@@ -2179,9 +2457,11 @@ and `minetest.auth_reload` call the authetification handler.
 * `minetest.get_gametime()`: returns the time, in seconds, since the world was created
 * `minetest.get_day_count()`: returns number days elapsed since world was created,
     * accounting for time changes.
-* `minetest.find_node_near(pos, radius, nodenames)`: returns pos or `nil`
+* `minetest.find_node_near(pos, radius, nodenames, [search_center])`: returns pos or `nil`
     * `radius`: using a maximum metric
     * `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
+    * `search_center` is an optional boolean (default: `false`)
+      If true `pos` is also checked for the nodes
 * `minetest.find_nodes_in_area(minp, maxp, nodenames)`: returns a list of positions
     * returns as second value a table with the count of the individual nodes found
     * `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
@@ -2199,7 +2479,7 @@ and `minetest.auth_reload` call the authetification handler.
     * `flags` is a flag field with the available flags: `dungeon`, `temple`, `cave_begin`,
    `cave_end`, `large_cave_begin`, `large_cave_end`, `decoration`
    * The second parameter is a list of IDS of decorations which notification is requested for
-* `get_gen_notify()`: returns a flagstring and a table with the deco_ids
+* `get_gen_notify()`: returns a flagstring and a table with the `deco_id`s
 * `minetest.get_mapgen_object(objectname)`
     * Return requested mapgen object if available (see "Mapgen objects")
 * `minetest.get_biome_id(biome_name)`
@@ -2207,9 +2487,9 @@ and `minetest.auth_reload` call the authetification handler.
       given biome_name string.
 * `minetest.get_mapgen_params()` Returns mapgen parameters, a table containing
   `mgname`, `seed`, `chunksize`, `water_level`, and `flags`.
-  * Deprecated: use minetest.get_mapgen_setting(name) instead
+  * Deprecated: use `minetest.get_mapgen_setting(name)` instead
 * `minetest.set_mapgen_params(MapgenParams)`
-    * Deprecated: use minetest.set_mapgen_setting(name, value, override) instead
+    * Deprecated: use `minetest.set_mapgen_setting(name, value, override)` instead
     * Set map generation parameters
     * Function cannot be called after the registration period; only initialization
       and `on_mapgen_init`
@@ -2234,7 +2514,7 @@ and `minetest.auth_reload` call the authetification handler.
      is not already present in map_meta.txt.
    * `override_meta` is an optional boolean (default: `false`). If this is set to true,
      the setting will become the active setting regardless of the map metafile contents.
-   * Note: to set the seed, use "seed", not "fixed_map_seed"
+   * Note: to set the seed, use `"seed"`, not `"fixed_map_seed"`
 * `minetest.set_mapgen_setting_noiseparams(name, value, [override_meta])`
    * Same as above, except value is a NoiseParams table.
 * `minetest.set_noiseparams(name, noiseparams, set_default)`
@@ -2262,8 +2542,8 @@ and `minetest.auth_reload` call the authetification handler.
     *   `function EmergeAreaCallback(blockpos, action, calls_remaining, param)`
     * - `blockpos` is the *block* coordinates of the block that had been emerged
     * - `action` could be one of the following constant values:
-    *   `core.EMERGE_CANCELLED`, `core.EMERGE_ERRORED`, `core.EMERGE_FROM_MEMORY`,
-    *   `core.EMERGE_FROM_DISK`, `core.EMERGE_GENERATED`
+    *   `minetest.EMERGE_CANCELLED`, `minetest.EMERGE_ERRORED`, `minetest.EMERGE_FROM_MEMORY`,
+    *   `minetest.EMERGE_FROM_DISK`, `minetest.EMERGE_GENERATED`
     * - `calls_remaining` is the number of callbacks to be expected after this one
     * - `param` is the user-defined parameter passed to emerge_area (or nil if the
     *   parameter was absent)
@@ -2287,8 +2567,6 @@ and `minetest.auth_reload` call the authetification handler.
     * `algorithm`: One of `"A*_noprefetch"` (default), `"A*"`, `"Dijkstra"`
 * `minetest.spawn_tree (pos, {treedef})`
     * spawns L-system tree at given `pos` with definition in `treedef` table
-    * Warning: L-system generation currently creates lighting bugs in the form of mapblock-sized shadows.
-      Often these bugs appear as subtle shadows in water.
 * `minetest.transforming_liquid_add(pos)`
     * add node to liquid update queue
 * `minetest.get_node_max_level(pos)`
@@ -2302,11 +2580,27 @@ and `minetest.auth_reload` call the authetification handler.
     * increase level of leveled node by level, default `level` equals `1`
     * if `totallevel > maxlevel`, returns rest (`total-max`)
     * can be negative for decreasing
-* `core.check_single_for_falling(pos)`
+* `minetest.fix_light(pos1, pos2)`: returns `true`/`false`
+    * resets the light in a cuboid-shaped part of
+      the map and removes lighting bugs.
+    * Loads the area if it is not loaded.
+    * `pos1` is the corner of the cuboid with the least coordinates
+      (in node coordinates), inclusive.
+    * `pos2` is the opposite corner of the cuboid, inclusive.
+    * The actual updated cuboid might be larger than the specified one,
+      because only whole map blocks can be updated.
+      The actual updated area consists of those map blocks that intersect
+      with the given cuboid.
+    * However, the neighborhood of the updated area might change
+      as well, as light can spread out of the cuboid, also light
+      might be removed.
+    * returns `false` if the area is not fully generated,
+      `true` otherwise
+* `minetest.check_single_for_falling(pos)`
     * causes an unsupported `group:falling_node` node to fall and causes an
       unattached `group:attached_node` node to fall.
     * does not spread these updates to neighbours.
-* `core.check_for_falling(pos)`
+* `minetest.check_for_falling(pos)`
     * causes an unsupported `group:falling_node` node to fall and causes an
       unattached `group:attached_node` node to fall.
     * spread these updates to neighbours and can cause a cascade
@@ -2321,7 +2615,7 @@ and `minetest.auth_reload` call the authetification handler.
     * `{type="detached", name="creative"}`
 * `minetest.create_detached_inventory(name, callbacks, [player_name])`: returns an `InvRef`
     * callbacks: See "Detached inventory callbacks"
-    * player_name: Make detached inventory available to one player exclusively,
+    * `player_name`: Make detached inventory available to one player exclusively,
       by default they will be sent to every player (even if not used).
       Note that this parameter is mostly just a workaround and will be removed in future releases.
     * Creates a detached inventory. If it already exists, it is cleared.
@@ -2337,11 +2631,11 @@ and `minetest.auth_reload` call the authetification handler.
     * `formspec`: formspec to display
 * `minetest.close_formspec(playername, formname)`
     * `playername`: name of player to close formspec
-    * `formname`: has to exactly match the one given in show_formspec, or the formspec will
+    * `formname`: has to exactly match the one given in `show_formspec`, or the formspec will
        not close.
-    * calling show_formspec(playername, formname, "") is equal to this expression
+    * calling `show_formspec(playername, formname, "")` is equal to this expression
     * to close a formspec regardless of the formname, call
-      minetest.close_formspec(playername, ""). USE THIS ONLY WHEN ABSOLUTELY NECESSARY!
+      `minetest.close_formspec(playername, "")`. **USE THIS ONLY WHEN ABSOLUTELY NECESSARY!**
 * `minetest.formspec_escape(string)`: returns a string
     * escapes the characters "[", "]", "\", "," and ";", which can not be used in formspecs
 * `minetest.explode_table_event(string)`: returns a table
@@ -2378,6 +2672,10 @@ and `minetest.auth_reload` call the authetification handler.
     * Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"`
 * `minetest.wallmounted_to_dir(wallmounted)`
     * Convert a wallmounted value back into a vector aimed directly out the "back" of a node
+* `minetest.dir_to_yaw(dir)`
+    * Convert a vector into a yaw (angle)
+* `minetest.yaw_to_dir(yaw)`
+    * Convert yaw (angle) to a vector
 * `minetest.get_node_drops(nodename, toolname)`
     * Returns list of item names.
     * **Note**: This will be removed or modified in a future version.
@@ -2403,6 +2701,7 @@ and `minetest.auth_reload` call the authetification handler.
     * returns indexed table with all registered recipes for query item (node)
       or `nil` if no recipe was found
     * recipe entry table:
+
             {
                 method = 'normal' or 'cooking' or 'fuel'
                 width = 0-3, 0 means shapeless recipe
@@ -2410,6 +2709,7 @@ and `minetest.auth_reload` call the authetification handler.
                 output = string with item name and quantity
             }
     * Example query for `"default:gold_ingot"` will return table:
+
             {
                 [1]={type = "cooking", width = 3, output = "default:gold_ingot",
                 items = {1 = "default:gold_lump"}},
@@ -2468,6 +2768,11 @@ These functions return the leftover itemstack.
     * `spec` is a `SimpleSoundSpec`
     * `parameters` is a sound parameter table
 * `minetest.sound_stop(handle)`
+* `minetest.sound_fade(handle, step, gain)`
+    * `handle` is a handle returned by `minetest.sound_play`
+    * `step` determines how fast a sound will fade.
+      Negative step will lower the sound volume, positive step will increase the sound volume
+    * `gain` the target gain for the fade.
 
 ### Timing
 * `minetest.after(time, func, ...)`
@@ -2475,10 +2780,17 @@ These functions return the leftover itemstack.
     * Optional: Variable number of arguments that are passed to `func`
 
 ### Server
-* `minetest.request_shutdown([message],[reconnect])`: request for server shutdown. Will display `message` to clients,
-    and `reconnect` == true displays a reconnect button.
+* `minetest.request_shutdown([message],[reconnect],[delay])`: request for server shutdown. Will display `message` to clients,
+    `reconnect` == true displays a reconnect button,
+    `delay` adds an optional delay (in seconds) before shutdown
+        negative delay cancels the current active shutdown
+        zero delay triggers an immediate shutdown.
+* `minetest.cancel_shutdown_requests()`: cancel current delayed shutdown
 * `minetest.get_server_status()`: returns server status string
 * `minetest.get_server_uptime()`: returns the server uptime in seconds
+* `minetest.remove_player(name)`: remove player from database (if he is not connected).
+    * Does not remove player authentication data, minetest.player_exists will continue to return true.
+    * Returns a code (0: successful, 1: no such player, 2: player is connected)
 
 ### Bans
 * `minetest.get_ban_list()`: returns the ban list (same as `minetest.get_ban_description("")`)
@@ -2503,7 +2815,7 @@ These functions return the leftover itemstack.
       minsize, maxsize,
       collisiondetection, texture, playername)`
 
-* `minetest.delete_particlespawner(id, player)``
+* `minetest.delete_particlespawner(id, player)`
     * Delete `ParticleSpawner` with `id` (return value from `minetest.add_particlespawner`)
     * If playername is specified, only deletes on the player's client,
     * otherwise on all clients
@@ -2574,8 +2886,14 @@ These functions return the leftover itemstack.
 * `HTTPApiTable.fetch_async_get(handle)`: returns HTTPRequestResult
     * Return response data for given asynchronous HTTP request
 
+### Storage API:
+* `minetest.get_mod_storage()`:
+    * returns reference to mod private `StorageRef`
+    * must be called during mod load time
+
 ### Misc.
 * `minetest.get_connected_players()`: returns list of `ObjectRefs`
+* `minetest.player_exists(name)`: boolean, whether player exists (regardless of online status)
 * `minetest.hud_replace_builtin(name, hud_definition)`
     * Replaces definition of a builtin hud element
     * `name`: `"breath"` or `"health"`
@@ -2605,7 +2923,7 @@ These functions return the leftover itemstack.
 * `minetest.write_json(data[, styled])`: returns a string or `nil` and an error message
     * Convert a Lua table into a JSON string
     * styled: Outputs in a human-readable format if this is set, defaults to false
-    * Unserializable things like functions and userdata are saved as null.
+    * Unserializable things like functions and userdata will cause an error.
     * **Warning**: JSON is more strict than the Lua table format.
         1. You can only use strings and positive integers of at least one as keys.
         2. You can not mix string and integer keys.
@@ -2722,6 +3040,8 @@ These functions return the leftover itemstack.
     * Map of object references, indexed by active object id
 * `minetest.luaentities`
     * Map of Lua entities, indexed by active object id
+* `minetest.registered_chatcommands`
+    * Map of registered chat command definitions, indexed by name
 * `minetest.registered_ores`
     * List of registered ore definitions.
 * `minetest.registered_biomes`
@@ -2732,9 +3052,8 @@ These functions return the leftover itemstack.
 Class reference
 ---------------
 
-### `NodeMetaRef`
-Node metadata: reference extra data and functionality stored in a node.
-Can be gotten via `minetest.get_meta(pos)`.
+### `MetaDataRef`
+See `StorageRef`, `NodeMetaRef` and `ItemStackMetaRef`.
 
 #### Methods
 * `set_string(name, value)`
@@ -2743,11 +3062,41 @@ Can be gotten via `minetest.get_meta(pos)`.
 * `get_int(name)`
 * `set_float(name, value)`
 * `get_float(name)`
-* `get_inventory()`: returns `InvRef`
-* `to_table()`: returns `nil` or `{fields = {...}, inventory = {list1 = {}, ...}}`
+* `to_table()`: returns `nil` or a table with keys:
+    * `fields`: key-value storage
+    * `inventory`: `{list1 = {}, ...}}` (NodeMetaRef only)
 * `from_table(nil or {})`
-    * to clear metadata, use from_table(nil)
-    * See "Node Metadata"
+    * Any non-table value will clear the metadata
+    * See "Node Metadata" for an example
+    * returns `true` on success
+* `equals(other)`
+    * returns `true` if this metadata has the same key-value pairs as `other`
+
+### `NodeMetaRef`
+Node metadata: reference extra data and functionality stored in a node.
+Can be obtained via `minetest.get_meta(pos)`.
+
+#### Methods
+* All methods in MetaDataRef
+* `get_inventory()`: returns `InvRef`
+* `mark_as_private(name or {name1, name2, ...})`: Mark specific vars as private
+  This will prevent them from being sent to the client. Note that the "private"
+  status will only be remembered if an associated key-value pair exists, meaning
+  it's best to call this when initializing all other meta (e.g. `on_construct`).
+
+### `ItemStackMetaRef`
+ItemStack metadata: reference extra data and functionality stored in a stack.
+Can be obtained via `item:get_meta()`.
+
+#### Methods
+* All methods in MetaDataRef
+
+### `StorageRef`
+Mod metadata: per mod metadata, saved automatically.
+Can be obtained via `minetest.get_mod_storage()` during load time.
+
+#### Methods
+* All methods in MetaDataRef
 
 ### `NodeTimerRef`
 Node Timers: a high resolution persistent per-node timer.
@@ -2758,7 +3107,7 @@ Can be gotten via `minetest.get_node_timer(pos)`.
     * set a timer's state
     * `timeout` is in seconds, and supports fractional values (0.1 etc)
     * `elapsed` is in seconds, and supports fractional values (0.1 etc)
-    * will trigger the node's `on_timer` function after `timeout`-elapsed seconds
+    * will trigger the node's `on_timer` function after `(timeout - elapsed)` seconds
 * `start(timeout)`
     * start a timer
     * equivalent to `set(timeout,0)`
@@ -2767,7 +3116,7 @@ Can be gotten via `minetest.get_node_timer(pos)`.
 * `get_timeout()`: returns current timeout in seconds
     * if `timeout` equals `0`, timer is inactive
 * `get_elapsed()`: returns current elapsed time in seconds
-    * the node's `on_timer` function will be called after `timeout`-elapsed seconds
+    * the node's `on_timer` function will be called after `(timeout - elapsed)` seconds
 * `is_started()`: returns boolean state of timer
     * returns `true` if timer is started, otherwise `false`
 
@@ -2778,10 +3127,10 @@ This is basically a reference to a C++ `ServerActiveObject`
 
 #### Methods
 * `remove()`: remove object (after returning from Lua)
-    * Note: Doesn't work on players, use minetest.kick_player instead
-* `getpos()`: returns `{x=num, y=num, z=num}`
-* `setpos(pos)`; `pos`=`{x=num, y=num, z=num}`
-* `moveto(pos, continuous=false)`: interpolated move
+    * Note: Doesn't work on players, use `minetest.kick_player` instead
+* `get_pos()`: returns `{x=num, y=num, z=num}`
+* `set_pos(pos)`; `pos`=`{x=num, y=num, z=num}`
+* `move_to(pos, continuous=false)`: interpolated move
 * `punch(puncher, time_from_last_punch, tool_capabilities, direction)`
     * `puncher` = another `ObjectRef`,
     * `time_from_last_punch` = time since last punch action of the puncher
@@ -2797,7 +3146,7 @@ This is basically a reference to a C++ `ServerActiveObject`
 * `set_armor_groups({group1=rating, group2=rating, ...})`
 * `get_armor_groups()`: returns a table with the armor group ratings
 * `set_animation({x=1,y=1}, frame_speed=15, frame_blend=0, frame_loop=true)`
-* `get_animation()`: returns range, frame_speed, frame_blend and frame_loop
+* `get_animation()`: returns `range`, `frame_speed`, `frame_blend` and `frame_loop`
 * `set_attach(parent, bone, position, rotation)`
     * `bone`: string
     * `position`: `{x=num, y=num, z=num}` (relative)
@@ -2827,14 +3176,15 @@ This is basically a reference to a C++ `ServerActiveObject`
       }
 
 ##### LuaEntitySAO-only (no-op for other objects)
-* `setvelocity({x=num, y=num, z=num})`
-* `getvelocity()`: returns `{x=num, y=num, z=num}`
-* `setacceleration({x=num, y=num, z=num})`
-* `getacceleration()`: returns `{x=num, y=num, z=num}`
-* `setyaw(radians)`
-* `getyaw()`: returns number in radians
-* `settexturemod(mod)`
-* `setsprite(p={x=0,y=0}, num_frames=1, framelength=0.2,
+* `set_velocity({x=num, y=num, z=num})`
+* `get_velocity()`: returns `{x=num, y=num, z=num}`
+* `set_acceleration({x=num, y=num, z=num})`
+* `get_acceleration()`: returns `{x=num, y=num, z=num}`
+* `set_yaw(radians)`
+* `get_yaw()`: returns number in radians
+* `set_texture_mod(mod)`
+* `get_texture_mod()` returns current texture modifier
+* `set_sprite(p={x=0,y=0}, num_frames=1, framelength=0.2,
   select_horiz_by_yawpitch=false)`
     * Select sprite from spritesheet with optional animation and DM-style
       texture selection based on yaw relative to camera
@@ -2854,21 +3204,28 @@ This is basically a reference to a C++ `ServerActiveObject`
      * radians - Angle from looking forward, where positive is downwards.
 * `set_look_horizontal(radians)`: sets look yaw
      * radians - Angle from the +z direction, where positive is counter-clockwise.
-* `get_look_pitch()`: pitch in radians - Deprecated as broken. Use get_look_vertical.
+* `get_look_pitch()`: pitch in radians - Deprecated as broken. Use `get_look_vertical`.
      * Angle ranges between -pi/2 and pi/2, which are straight down and up respectively.
-* `get_look_yaw()`: yaw in radians - Deprecated as broken. Use get_look_horizontal.
+* `get_look_yaw()`: yaw in radians - Deprecated as broken. Use `get_look_horizontal`.
      * Angle is counter-clockwise from the +x direction.
-* `set_look_pitch(radians)`: sets look pitch - Deprecated. Use set_look_vertical.
-* `set_look_yaw(radians)`: sets look yaw - Deprecated. Use set_look_horizontal.
+* `set_look_pitch(radians)`: sets look pitch - Deprecated. Use `set_look_vertical`.
+* `set_look_yaw(radians)`: sets look yaw - Deprecated. Use `set_look_horizontal`.
 * `get_breath()`: returns players breath
 * `set_breath(value)`: sets players breath
      * values:
         * `0`: player is drowning,
         * `1`-`10`: remaining number of bubbles
         * `11`: bubbles bar is not shown
+* `set_attribute(attribute, value)`:
+    * Sets an extra attribute with value on player.
+    * `value` must be a string.
+    * If `value` is `nil`, remove attribute from player.
+* `get_attribute(attribute)`:
+    * Returns value (a string) for extra attribute.
+    * Returns `nil` if no attribute found.
 * `set_inventory_formspec(formspec)`
     * Redefine player's inventory form
-    * Should usually be called in on_joinplayer
+    * Should usually be called in `on_joinplayer`
 * `get_inventory_formspec()`: returns a formspec string
 * `get_player_control()`: returns table with player pressed keys
     * `{jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}`
@@ -2880,8 +3237,12 @@ This is basically a reference to a C++ `ServerActiveObject`
         * `jump`: multiplier to default jump value (default: `1`)
         * `gravity`: multiplier to default gravity value (default: `1`)
         * `sneak`: whether player can sneak (default: `true`)
-        * `sneak_glitch`: whether player can use the sneak glitch (default: `true`)
-* `get_physics_override()`: returns the table given to set_physics_override
+        * `sneak_glitch`: whether player can use the new move code replications
+          of the old sneak side-effects: sneak ladders and 2 node sneak jump
+          (default: `false`)
+        * `new_move`: use new move/sneak code. When `false` the exact old code
+          is used for the specific old sneak behaviour (default: `true`)
+* `get_physics_override()`: returns the table given to `set_physics_override`
 * `hud_add(hud definition)`: add a HUD element described by HUD def, returns ID
    number on success
 * `hud_remove(id)`: remove the HUD element of the specified id
@@ -2905,13 +3266,24 @@ This is basically a reference to a C++ `ServerActiveObject`
 * `hud_set_hotbar_selected_image(texturename)`
     * sets image for selected item of hotbar
 * `hud_get_hotbar_selected_image`: returns texturename
-* `set_sky(bgcolor, type, {texture names})`
+* `set_sky(bgcolor, type, {texture names}, clouds)`
     * `bgcolor`: ColorSpec, defaults to white
-    * Available types:
+    * `type`: Available types:
         * `"regular"`: Uses 0 textures, `bgcolor` ignored
         * `"skybox"`: Uses 6 textures, `bgcolor` used
         * `"plain"`: Uses 0 textures, `bgcolor` used
-* `get_sky()`: returns bgcolor, type and a table with the textures
+    * `clouds`: Boolean for whether clouds appear in front of `"skybox"` or
+      `"plain"` custom skyboxes (default: `true`)
+* `get_sky()`: returns bgcolor, type, table of textures, clouds
+* `set_clouds(parameters)`: set cloud parameters
+	* `parameters` is a table with the following optional fields:
+		* `density`: from `0` (no clouds) to `1` (full clouds) (default `0.4`)
+		* `color`: basic cloud color, with alpha channel (default `#fff0f0e5`)
+		* `ambient`: cloud color lower bound, use for a "glow at night" effect (default `#000000`)
+		* `height`: cloud height, i.e. y of cloud base (default per conf, usually `120`)
+		* `thickness`: cloud thickness in nodes (default `16`)
+		* `speed`: 2D cloud speed + direction in nodes per second (default `{x=0, y=-2}`)
+* `get_clouds()`: returns a table with the current cloud parameters as in `set_clouds`
 * `override_day_night_ratio(ratio or nil)`
     * `0`...`1`: Overrides day-night ratio, controlling sunlight to a specific amount
     * `nil`: Disables override, defaulting to sunlight based on day-night cycle
@@ -2925,11 +3297,11 @@ This is basically a reference to a C++ `ServerActiveObject`
             {x=189, y=198}, -- <  dig animation key frames
             {x=200, y=219}, -- <  walk+dig animation key frames
             frame_speed=30): -- <  animation frame speed
-* `get_local_animation()`: returns stand, walk, dig, dig+walk tables and frame_speed
+* `get_local_animation()`: returns stand, walk, dig, dig+walk tables and `frame_speed`
 * `set_eye_offset({x=0,y=0,z=0},{x=0,y=0,z=0})`: defines offset value for camera per player
     * in first person view
     * in third person view (max. values `{x=-10/10,y=-10,15,z=-5/5}`)
-* `get_eye_offset()`: returns offset_first and offset_third
+* `get_eye_offset()`: returns `offset_first` and `offset_third`
 
 ### `InvRef`
 An `InvRef` is a reference to an inventory.
@@ -3015,8 +3387,9 @@ an itemstring, a table or `nil`.
 * `set_count(count)`: Returns boolean whether item was cleared
 * `get_wear()`: Returns tool wear (`0`-`65535`), `0` for non-tools.
 * `set_wear(wear)`: Returns boolean whether item was cleared
-* `get_metadata()`: Returns metadata (a string attached to an item stack).
-* `set_metadata(metadata)`: Returns true.
+* `get_meta()`: Returns ItemStackMetaRef. See section for more details
+* `get_metadata()`: (DEPRECATED) Returns metadata (a string attached to an item stack).
+* `set_metadata(metadata)`: (DEPRECATED) Returns true.
 * `clear()`: removes all items from the stack, making it empty.
 * `replace(item)`: replace the contents of this stack.
     * `item` can also be an itemstring or table.
@@ -3061,9 +3434,9 @@ It can be created via `PcgRandom(seed)` or `PcgRandom(seed, sequence)`.
 * `next(min, max)`: return next integer random number [`min`...`max`]
 * `rand_normal_dist(min, max, num_trials=6)`: return normally distributed random number [`min`...`max`]
     * This is only a rough approximation of a normal distribution with:
-    *   mean = (max - min) / 2, and
-    *   variance = (((max - min + 1) ^ 2) - 1) / (12 * num_trials)
-    * Increasing num_trials improves accuracy of the approximation
+    *   `mean = (max - min) / 2`, and
+    *   `variance = (((max - min + 1) ^ 2) - 1) / (12 * num_trials)`
+    * Increasing `num_trials` improves accuracy of the approximation
 
 ### `SecureRandom`
 Interface for the operating system's crypto-secure PRNG.
@@ -3131,11 +3504,11 @@ destruction callbacks run, and no rollback information is logged.
 
 It is important to note that VoxelManip is designed for speed, and *not* ease of use or flexibility.
 If your mod requires a map manipulation facility that will handle 100% of all edge cases, or the use
-of high level node placement features, perhaps minetest.set_node() is better suited for the job.
+of high level node placement features, perhaps `minetest.set_node()` is better suited for the job.
 
 In addition, VoxelManip might not be faster, or could even be slower, for your specific use case.
 VoxelManip is most effective when setting very large areas of map at once - for example, if only
-setting a 5x5x5 node area, a minetest.set_node() loop may be more optimal.  Always profile code
+setting a 5x5x5 node area, a `minetest.set_node()` loop may be more optimal.  Always profile code
 using both methods of map manipulation to determine which is most appropriate for your usage.
 
 #### Using VoxelManip
@@ -3171,17 +3544,14 @@ otherwise explicitly stated.
 Once the bulk data has been edited to your liking, the internal VoxelManip state can be set using:
 `VoxelManip:set_data()` for node content (in Content ID form, see section 'Content IDs'),
 `VoxelManip:set_light_data()` for node light levels, and
-`VoxelManip:set_param2_data()` for the node type-dependent "param2" values.
+`VoxelManip:set_param2_data()` for the node type-dependent `param2` values.
 
 The parameter to each of the above three functions can use any table at all in the same flat array
-format as produced by get_data() et al. and is *not required* to be a table retrieved from get_data().
+format as produced by `get_data()` et al. and is *not required* to be a table retrieved from `get_data()`.
 
 Once the internal VoxelManip state has been modified to your liking, the changes can be committed back
 to the map by calling `VoxelManip:write_to_map()`.
 
-Finally, a call to `VoxelManip:update_map()` is required to re-calculate lighting and set the blocks
-as being modified so that connected clients are sent the updated parts of map.
-
 
 ##### Flat array format
 Let
@@ -3193,6 +3563,7 @@ Then, for a loaded region of p1..p2, this array ranges from `1` up to and includ
 the expression `Nx * Ny * Nz`.
 
 Positions offset from p1 are present in the array with the format of:
+
 ```
 [
     (0, 0, 0),   (1, 0, 0),   (2, 0, 0),   ... (Nx, 0, 0),
@@ -3224,11 +3595,10 @@ After registration of a node, its Content ID will remain the same throughout exe
 Note that the node being queried needs to have already been been registered.
 
 The following builtin node types have their Content IDs defined as constants:
-```
-core.CONTENT_UNKNOWN (ID for "unknown" nodes)
-core.CONTENT_AIR     (ID for "air" nodes)
-core.CONTENT_IGNORE  (ID for "ignore" nodes)
-```
+
+* `minetest.CONTENT_UNKNOWN`:	ID for "unknown" nodes
+* `minetest.CONTENT_AIR`:	ID for "air" nodes
+* `minetest.CONTENT_IGNORE`:	ID for "ignore" nodes
 
 ##### Mapgen VoxelManip objects
 Inside of `on_generated()` callbacks, it is possible to retrieve the same VoxelManip object used by the
@@ -3246,8 +3616,6 @@ but with a few differences:
   will also update the Mapgen VoxelManip object's internal state active on the current thread.
 * After modifying the Mapgen VoxelManip object's internal buffer, it may be necessary to update lighting
   information using either: `VoxelManip:calc_lighting()` or `VoxelManip:set_lighting()`.
-* `VoxelManip:update_map()` does not need to be called after `write_to_map()`.  The map update is performed
-  automatically after all on_generated callbacks have been run for that generated block.
 
 ##### Other API functions operating on a VoxelManip
 If any VoxelManip contents were set to a liquid node, `VoxelManip:update_liquids()` must be called
@@ -3281,8 +3649,14 @@ will place the schematic inside of the VoxelManip.
 * `read_from_map(p1, p2)`:  Loads a chunk of map into the VoxelManip object containing
   the region formed by `p1` and `p2`.
     * returns actual emerged `pmin`, actual emerged `pmax`
-* `write_to_map()`: Writes the data loaded from the `VoxelManip` back to the map.
+* `write_to_map([light])`: Writes the data loaded from the `VoxelManip` back to the map.
     * **important**: data must be set using `VoxelManip:set_data()` before calling this
+    * if `light` is true, then lighting is automatically recalculated.
+      The default value is true.
+      If `light` is false, no light calculations happen, and you should correct
+      all modified blocks with `minetest.fix_light()` as soon as possible.
+      Keep in mind that modifying the map where light is incorrect can cause
+      more lighting bugs.
 * `get_node_at(pos)`: Returns a `MapNode` table of the node currently loaded in
   the `VoxelManip` at that position
 * `set_node_at(pos, node)`: Sets a specific `MapNode` in the `VoxelManip` at that position
@@ -3290,9 +3664,7 @@ will place the schematic inside of the VoxelManip.
     * returns raw node data in the form of an array of node content IDs
     * if the param `buffer` is present, this table will be used to store the result instead
 * `set_data(data)`: Sets the data contents of the `VoxelManip` object
-* `update_map()`: Update map after writing chunk back to map.
-    * To be used only by `VoxelManip` objects created by the mod itself;
-      not a `VoxelManip` that was retrieved from `minetest.get_mapgen_object`
+* `update_map()`: Does nothing, kept for compatibility.
 * `set_lighting(light, [p1, p2])`: Set the lighting within the `VoxelManip` to a uniform value
     * `light` is a table, `{day=<0...15>, night=<0...15>}`
     * To be used only by a `VoxelManip` object from `minetest.get_mapgen_object`
@@ -3351,10 +3723,15 @@ It can be created via `Settings(filename)`.
 * `get(key)`: returns a value
 * `get_bool(key)`: returns a boolean
 * `set(key, value)`
+    * Setting names can't contain whitespace or any of `="{}#`.
+    * Setting values can't contain the sequence `\n"""`.
+    * Setting names starting with "secure." can't be set on the main settings object (`minetest.settings`).
+* `set_bool(key, value)`
+    * See documentation for set() above.
 * `remove(key)`: returns a boolean (`true` for success)
 * `get_names()`: returns `{key1,...}`
 * `write()`: returns a boolean (`true` for success)
-    * write changes to file
+    * Writes changes to file.
 * `to_table()`: returns `{[key1]=value1,...}`
 
 Mapgen objects
@@ -3516,24 +3893,26 @@ Definition tables
     {
         hp_max = 1,
         physical = true,
-        collide_with_objects = true, -- collide with other objects if physical=true
+        collide_with_objects = true, -- collide with other objects if physical = true
         weight = 5,
-        collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
-        visual = "cube"/"sprite"/"upright_sprite"/"mesh"/"wielditem",
-        visual_size = {x=1, y=1},
+        collisionbox = {-0.5, 0.0, -0.5, 0.5, 1.0, 0.5},
+        visual = "cube" / "sprite" / "upright_sprite" / "mesh" / "wielditem",
+        visual_size = {x = 1, y = 1},
         mesh = "model",
         textures = {}, -- number of required textures depends on visual
         colors = {}, -- number of required colors depends on visual
-        spritediv = {x=1, y=1},
-        initial_sprite_basepos = {x=0, y=0},
+        spritediv = {x = 1, y = 1},
+        initial_sprite_basepos = {x = 0, y = 0},
         is_visible = true,
         makes_footstep_sound = false,
         automatic_rotate = false,
         stepheight = 0,
         automatic_face_movement_dir = 0.0,
-    --  ^ automatically set yaw to movement direction; offset in degrees; false to disable
+    --  ^ Automatically set yaw to movement direction, offset in degrees,
+    --    'false' to disable.
         automatic_face_movement_max_rotation_per_sec = -1,
-    --  ^ limit automatic rotation to this value in degrees per second. values < 0 no limit
+    --  ^ Limit automatic rotation to this value in degrees per second,
+    --    value < 0 no limit.
         backface_culling = true, -- false to disable backface_culling for model
         nametag = "", -- by default empty, for players their name is shown if empty
         nametag_color = <color>, -- sets color of nametag as ColorSpec
@@ -3609,6 +3988,19 @@ Definition tables
                             {hard = 1, metal = 1, spikes = 1}
         inventory_image = "default_tool_steelaxe.png",
         wield_image = "",
+        palette = "",
+        --[[
+        ^ An image file containing the palette of a node.
+        ^ You can set the currently used color as the
+        ^ "palette_index" field of the item stack metadata.
+        ^ The palette is always stretched to fit indices
+        ^ between 0 and 255, to ensure compatibility with
+        ^ "colorfacedir" and "colorwallmounted" nodes.
+        ]]
+        color = "0xFFFFFFFF",
+        --[[
+        ^ The color of the item. The palette overrides this.
+        ]]
         wield_scale = {x = 1, y = 1, z = 1},
         stack_max = 99,
         range = 4.0,
@@ -3692,11 +4084,33 @@ Definition tables
 	  when displacement mapping is used
 	  Directions are from the point of view of the tile texture,
 	  not the node it's on
+* `{name="image.png", color=ColorSpec}`
+    * the texture's color will be multiplied with this color.
+    * the tile's color overrides the owning node's color in all cases.
 * deprecated, yet still supported field names:
     * `image` (name)
 
 ### Tile animation definition
-* `{type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}`
+
+	{
+		type = "vertical_frames",
+		aspect_w = 16,
+		-- ^ specify width of a frame in pixels
+		aspect_h = 16,
+		-- ^ specify height of a frame in pixels
+		length = 3.0,
+		-- ^ specify full loop length
+	}
+
+	{
+		type = "sheet_2d",
+		frames_w = 5,
+		-- ^ specify width in number of frames
+		frames_h = 3,
+		-- ^ specify height in number of frames
+		frame_length = 0.5,
+		-- ^ specify length of a single frame
+	}
 
 ### Node definition (`register_node`)
 
@@ -3705,18 +4119,34 @@ Definition tables
 
         drawtype = "normal", -- See "Node drawtypes"
         visual_scale = 1.0, --[[
-        ^ Supported for drawtypes "plantlike", "signlike", "torchlike", "mesh".
-        ^ For plantlike, the image will start at the bottom of the node; for the
-        ^ other drawtypes, the image will be centered on the node.
+        ^ Supported for drawtypes "plantlike", "signlike", "torchlike",
+        ^ "firelike", "mesh".
+        ^ For plantlike and firelike, the image will start at the bottom of the
+        ^ node, for the other drawtypes the image will be centered on the node.
         ^ Note that positioning for "torchlike" may still change. ]]
         tiles = {tile definition 1, def2, def3, def4, def5, def6}, --[[
         ^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
         ^ List can be shortened to needed length ]]
+        overlay_tiles = {tile definition 1, def2, def3, def4, def5, def6}, --[[
+        ^ Same as `tiles`, but these textures are drawn on top of the
+        ^ base tiles. You can use this to colorize only specific parts of
+        ^ your texture. If the texture name is an empty string, that
+        ^ overlay is not drawn. Since such tiles are drawn twice, it
+        ^ is not recommended to use overlays on very common nodes.
         special_tiles = {tile definition 1, Tile definition 2}, --[[
         ^ Special textures of node; used rarely (old field name: special_materials)
         ^ List can be shortened to needed length ]]
-        alpha = 255,
+        color = ColorSpec, --[[
+        ^ The node's original color will be multiplied with this color.
+        ^ If the node has a palette, then this setting only has an effect
+        ^ in the inventory and on the wield item. ]]
         use_texture_alpha = false, -- Use texture's alpha channel
+        palette = "palette.png", --[[
+        ^ The node's `param2` is used to select a pixel from the image
+        ^ (pixels are arranged from left to right and from top to bottom).
+        ^ The node's color will be multiplied with the selected pixel's
+        ^ color. Tiles can override this behavior.
+        ^ Only when `paramtype2` supports palettes. ]]
         post_effect_color = "green#0F", -- If player is inside node, see "ColorSpec"
         paramtype = "none", -- See "Nodes" --[[
         ^ paramtype = "light" allows light to propagate from or through the node with light value
@@ -3730,7 +4160,9 @@ Definition tables
         diggable = true, -- If false, can never be dug
         climbable = false, -- If true, can be climbed on (ladder)
         buildable_to = false, -- If true, placed nodes can replace this node
-        floodable = false, -- If true, liquids flow into and replace this node
+        floodable = false, --[[
+        ^ If true, liquids flow into and replace this node.
+        ^ Warning: making a liquid node 'floodable' does not work and may cause problems. ]]
         liquidtype = "none", -- "none"/"source"/"flowing"
         liquid_alternative_flowing = "", -- Flowing version of source liquid
         liquid_alternative_source = "", -- Source version of flowing liquid
@@ -3759,6 +4191,12 @@ Definition tables
         ^ If drawtype "nodebox" is used and selection_box is nil, then node_box is used. ]]
         legacy_facedir_simple = false, -- Support maps made in and before January 2012
         legacy_wallmounted = false, -- Support maps made in and before January 2012
+        waving = 0, --[[ valid for mesh, nodebox, plantlike, allfaces_optional nodes
+        ^ 1 - wave node like plants (top of node moves, bottom is fixed)
+        ^ 2 - wave node like leaves (whole node moves side-to-side synchronously)
+        ^ caveats: not all models will properly wave
+        ^ plantlike drawtype nodes can only wave like plants
+        ^ allfaces_optional drawtype nodes can only wave like leaves --]]
         sounds = {
             footstep = <SimpleSoundSpec>,
             dig = <SimpleSoundSpec>, -- "__group" = group-based sound (default)
@@ -3791,6 +4229,14 @@ Definition tables
         ^ Node destructor; called after removing node
         ^ Not called for bulk node placement (i.e. schematics and VoxelManip)
         ^ default: nil ]]
+        on_flood = func(pos, oldnode, newnode), --[[
+        ^ Called when a liquid (newnode) is about to flood oldnode, if
+        ^ it has `floodable = true` in the nodedef. Not called for bulk
+        ^ node placement (i.e. schematics and VoxelManip) or air nodes. If
+        ^ return true the node is not flooded, but on_flood callback will
+        ^ most likely be called over and over again every liquid update
+        ^ interval. Default: nil.
+        ^ Warning: making a liquid node 'floodable' does not work and may cause problems. ]]
 
         after_place_node = func(pos, placer, itemstack, pointed_thing) --[[
         ^ Called after constructing node when node was placed using
@@ -4151,10 +4597,15 @@ The Biome API is still in an experimental phase and subject to change.
     --  ^ vertical: if true faces player using y axis only
         texture = "image.png",
     --  ^ Uses texture (string)
-        playername = "singleplayer"
+        playername = "singleplayer",
     --  ^ optional, if specified spawns particle only on the player's client
+        animation = {Tile Animation definition},
+    --  ^ optional, specifies how to animate the particle texture
+        glow = 0
+    --  ^ optional, specify particle self-luminescence in darkness
     }
 
+
 ### `ParticleSpawner` definition (`add_particlespawner`)
 
     {
diff --git a/doc/menu_lua_api.txt b/doc/menu_lua_api.txt
index 423b8bb9c..074bc962d 100644
--- a/doc/menu_lua_api.txt
+++ b/doc/menu_lua_api.txt
@@ -1,4 +1,4 @@
-Minetest Lua Mainmenu API Reference 0.4.15
+Minetest Lua Mainmenu API Reference 0.4.16
 ========================================
 
 Introduction
diff --git a/doc/texture_packs.txt b/doc/texture_packs.txt
index 5c535a9f1..1813c29e4 100644
--- a/doc/texture_packs.txt
+++ b/doc/texture_packs.txt
@@ -76,6 +76,9 @@ by texture packs. All existing fallback textures can be found in the directory
 * `player.png`: front texture of the 2D upright sprite player
 * `player_back.png`: back texture of the 2D upright sprite player
 
+* `progress_bar.png`: foreground texture of the loading screen's progress bar
+* `progress_bar_bg.png`: background texture of the loading screen's progress bar
+
 * `moon.png`: texture of the moon. Default texture is generated by Minetest
 * `moon_tonemap.png`: tonemap to be used when `moon.png` was found
 * `sun.png`: texture of the sun. Default texture is generated by Minetest
diff --git a/doc/world_format.txt b/doc/world_format.txt
index a4fb3d8f2..976d14fd5 100644
--- a/doc/world_format.txt
+++ b/doc/world_format.txt
@@ -1,12 +1,13 @@
 =============================
-Minetest World Format 22...25
+Minetest World Format 22...27
 =============================
 
 This applies to a world format carrying the block serialization version
-22...25, used at least in
+22...27, used at least in
 - 0.4.dev-20120322 ... 0.4.dev-20120606 (22...23)
 - 0.4.0 (23)
 - 24 was never released as stable and existed for ~2 days
+- 27 was added in 0.4.15-dev
 
 The block serialization version does not fully specify every aspect of this
 format; if compliance with this format is to be checked, it needs to be
@@ -262,15 +263,36 @@ u8 flags
   - 0x02: day_night_differs: Whether the lighting of the block is different
     on day and night. Only blocks that have this bit set are updated when
     day transforms to night.
-  - 0x04: lighting_expired: If true, lighting is invalid and should be
-    updated.  If you can't calculate lighting in your generator properly,
-    you could try setting this 1 to everything and setting the uppermost
-    block in every sector as is_underground=0. I am quite sure it doesn't
-    work properly, though.
+  - 0x04: lighting_expired: Not used in version 27 and above. If true,
+    lighting is invalid and should be updated.  If you can't calculate
+    lighting in your generator properly, you could try setting this 1 to
+    everything and setting the uppermost block in every sector as
+    is_underground=0. I am quite sure it doesn't work properly, though.
   - 0x08: generated: True if the block has been generated. If false, block
     is mostly filled with CONTENT_IGNORE and is likely to contain eg. parts
     of trees of neighboring blocks.
 
+u16 lighting_complete
+- Added in version 27.
+- This contains 12 flags, each of them corresponds to a direction.
+- Indicates if the light is correct at the sides of a map block.
+  Lighting may not be correct if the light changed, but a neighbor
+  block was not loaded at that time.
+  If these flags are false, Minetest will automatically recompute light
+  when both this block and its required neighbor are loaded.
+- The bit order is:
+  nothing,  nothing,  nothing,  nothing,
+  night X-, night Y-, night Z-, night Z+, night Y+, night X+,
+  day X-,   day Y-,   day Z-,   day Z+,   day Y+,   day X+.
+  Where 'day' is for the day light bank, 'night' is for the night
+  light bank.
+  The 'nothing' bits should be always set, as they will be used
+  to indicate if direct sunlight spreading is finished.
+- Example: if the block at (0, 0, 0) has
+  lighting_complete = 0b1111111111111110,
+  then Minetest will correct lighting in the day light bank when
+  the block at (1, 0, 0) is also loaded.
+
 u8 content_width
 - Number of bytes in the content (param0) fields of nodes
 if map format version <= 23: