Creatures MOB-Engine API
------------------------

creatures.register_mob(#Creature definition)
 -registers a mob at MOB-Engine; returns true when sucessfull

creatures.register_alias(old_mob, new_mob) -- returns true if sucessfull
 -registers an alias for other mob, e.g. from other mods or removed ones.
	existent entities (MOBs), Spawners and Spawn Eggs are converted;
	returns true when sucessfull
    ^ old_mob: name as string, e.g. "creatures:oerrki"
    ^ new_mob: name as string, e.g. "creatures:oerkki"
    ^ example: creatures.register_alias("creatures:oerrki", "creatures:oerkki")

creatures.rnd(chance_table)
 -returns a weighted random table element; chance_sum of table must be 1
    ^ example: creatures.rnd({elem1 = {chance = 0.7}, {elem2 = {chance = 0.3}})

creatures.compare_pos(pos1, pos2)
 -returns true if pos1 == pos2

creatures.findTarget(search_obj, pos, radius, search_type, mob_name, xray, no_count)
 -returns table of found objects (as ObjectRef) and boolean player_near
  ^ search_obj is searching object; can be nil
  ^ pos is starting position for search radius
  ^ radius for searching in blocks/node
  ^ search_type that specifies returned object requirements
    ^ "all" -- returns every object except dropped Items
    ^ "hostile" -- returns every object(creature) that has hostile setting or is player
      ^ ignores "mob_type" if specified
    ^ "nonhostile" -- returns every object that is not hostile or player
    ^ "player" -- returns all players
    ^ "mates" -- returns all objects(creatures) that are of same kind
      ^ requires "mob_type" specifies
  ^ mob_type specifies creature that is ignored or searched, depending on search_type
  ^ xray allows searching through blocks/nodes (default == false)
  ^ no_count skips collecting loop and returns just the boolean player_near
    ^ table is empty

creatures.dropItems(pos, drops)
 -drops items at position pos
  ^ pos where to drop Items
  ^ drops table in #ItemDrops format


#ItemDrops
----------
{
  {
    <Itemname>, -- e.g. "default:wood"
    <amount>,   -- either a <number> or table in format {min = <number>, max = <number>}; optional
    <rarity>    -- "chance = <value>": <value> between 0.0 and 1.0
  },
}

Example:
Will drop with a chance of 30%  1 to 3 items of type "default:wood"
and with a chance of 100% 2 items of type "default:stone"
{
  {"default:wood", {min = 1, max = 3}, chance = 0.3},
  {"default:stone", 2}
}


#Creature definition
--------------------
{
  name = "",                 -- e.g. "creatures:sheep"
  stats = {
    hp = 1,                  -- 1 HP = "1/2 player heart"
    hostile = false,         -- is mob hostile (required for mode "attack") <optional>
    lifetime = 300,          -- after which time mob despawns, in seconds <optional>
    dies_when_tamed = false, -- stop despawn when tamed <optional>
    can_jump = 1,            -- height in nodes <optional>
    can_swim = false,        -- can mob swim or will it drown <optional>
    can_fly = false,         -- allows to fly (requires mode "fly") and disable step sounds <optional>
    can_burn = false,        -- takes damage of lava <optional>
    can_panic = false,       -- runs fast around when hit (requires mode "walk") <optional>
    has_falldamage = false,  -- deals damage if falling more than 3 blocks <optional>
    has_kockback = false,    -- get knocked back when hit <optional>
    sneaky = false,          -- disables step sounds <optional>
    light = {min, max},      -- which light level will burn creature (requires can_burn = true) <optional>
  },

  modes = {
    idle = {chance = <part of 1.0>, duration = <time>, moving_speed = <number>, update_yaw = <yawtime>},
      ^ chance  -- number between 0.0 and 1.0 (!!NOTE: sum of all modes MUST be 1.0!!)
       ^ if chance is 0 then mode is not chosen automatically
      ^ duration  -- time in seconds until the next mode is chosen (depending on chance)
      ^ moving_speed  -- moving speed(flying/walking) <optional>
      ^ update_yaw  -- timer in seconds until the looking dir is changed <optional>
        ^ if moving_speed > 0 then the moving direction is also changed

    -- special modes
    attack = {<same as above>}
    follow = {<same as above>, radius = <number>, timer = <time>, items = <table>},
      ^ same as above  -- all possible values like specified above
      ^ radius  -- search distance in blocks/nodes for player
      ^ timer  -- time in seconds between each check for player
      ^ items  -- table of items to make mob follow in format {<Itemname>, <Itemname>}; e.g. {"farming:wheat"}
    eat = {<same as above>, nodes = <table>},
      ^ same as above  -- all possible values like specified above
      ^ items  -- eatable nodes in format {<Itemname>, <Itemname>}; e.g. {"default:dirt_with_grass"}
  },

  model = {
    mesh = "creatures_sheep.x",          -- mesh name; see Minetest Documentation for supported filetypes
    textures = {"creatures_sheep.png"},  -- table of textures; see Minetest Documentation
    collisionbox = <NodeBox>,            -- defines mesh collision box; see Minetest Documentation
    rotation = 0.0,                      -- sets rotation offset when moving
    backface_culling = false,            -- set true to enable backface culling
    animations = {                       -- animation used if defined <optional>
      idle = {#AnimationDef},            -- see #AnimationDef
        ... -- depends on modes (must correspond to be used);
              ^ supported "special modes": eat, follow, attack, death, swim, panic
    },
  },

  sounds = {
      on_damage = {#SoundDef},            -- see #SoundDef <optional>
      on_death = {#SoundDef},             -- see #SoundDef <optional>
      swim = {#SoundDef},                 -- see #SoundDef <optional>
      random = {                          -- depends on mode <optional>
        idle = {#SoundDef},               -- <optional>
        ... -- depends on modes (must correspond to be used); supports "special modes": eat, follow, attack
      },
  },

  drops = {#ItemDrops},     -- see #ItemDrops definition <optional>
    ^ can also be a function; receives "self" reference

  combat = {              -- specifies behavior of hostile mobs in "attack" mode
    attack_damage = 1,       -- how much damage deals each hit
    attack_speed = 0.6,      -- time in seconds between hits
    attack_radius = 1.1,     -- distance in blocks mob can reach to hit

    search_enemy = true,     -- true to search enemies to attack
    search_timer = 2,        -- time in seconds to search an enemy (only if none found yet)
    search_radius = 12,      -- radius in blocks within enemies are searched
    search_type = "player",  -- what enemy is being searched (see types at creatures.findTarget())
  }

  spawning = {                  -- defines spawning in world <optional>
    abm_nodes = {
      spawn_on = {<table>},     -- on what nodes mob can spawn <optional>
        ^ table  -- nodes and groups in table format; e.g. {"group:stone", "default:stone"}
      neighbors = {},           -- what node should be neighbors to spawnnode <optional>
        ^ can be nil or table as above; "air" is forced always as neighbor
    },
    abm_interval = <interval>,  -- time in seconds until Minetest tries to find a node with set specs
    abm_chance = <chance>,      -- chance is 1/<chance>
    max_number = <number>,             -- maximum mobs of this kind per mapblock(16x16x16)
    number = <amount>,          -- how many mobs are spawned if found suitable spawn position
      ^ amount  -- number or table {min = <value>, max = <value>}
    time_range = <range>,       -- time range in time of day format (0-24000) <optional>
      ^ range  -- table {min = <value>, max = <value>}
    light = <range>,            -- min and max lightvalue at spawn position <optional>
      ^ range  -- table {min = <value>, max = <value>}
    height_limit = <range>,     -- min and max height (world Y coordinate) <optional>
      ^ range  -- table {min = <value>, max = <value>}

    spawn_egg = {           -- is set a spawn_egg is added to creative inventory <optional>
      description = <desc>, -- Item description as string
      texture = <name>,     -- texture name as string
    },

    spawner = {          -- is set a spawner_node is added to creative inventory <optional>
      range = <number>,  -- defines an area (in blocks/nodes) within mobs are spawned
      number = <number>, -- maxmimum number of mobs spawned in area defined via range
      description = <desc>, -- Item description as string <optional>
      light = <range>,   -- min and max lightvalue at spawn position <optional>
        ^ range  -- table {min = <value>, max = <value>}
    }
  },

  on_rightclick = func(self, clicker) -- called when mob is rightclicked
    ^ prevents default action when returns boolean true

  on_punch = func(self, puncher) -- called when mob is punched (puncher can be nil)
    ^ prevents default action when returns boolean true

  on_step = func(self, dtime) -- called each server step
    ^ prevents default action when returns boolean true

  on_activate = func(self, staticdata) -- called when mob (re-)actived
    ^ Note: staticdata is deserialized by MOB-Engine (including costum values)

  get_staticdata = func(self) -- called when mob is punched (puncher can be nil)
    ^ must return a table to save mob data (serialization is done by MOB-Engine)
    ^ e.g:
      return {
        costum_mob_data = self.my_value,
        }
}

#AnimationDef {
  start = 0,    -- animation start frame
  stop = 80,    -- animation end frame
  speed = 15,   -- animation speed
  loop = true,  -- if false, animation if just played once <optional>
  duration = 1  -- only supported in "death"-Animation, sets time the animation needs until mob is removed <optional>
}

#SoundDef {
  name = <name>,        -- sound name as string; see Minetest documentation
  gain = 1.0,           -- sound gain; see Minetest documentation
  distance = <number>,  -- hear distance in blocks/nodes <optional>
  time_min = <time>     -- minimum time in seconds between sounds (random only) <optional>
  time_max = <time>     -- maximum time in seconds between sounds (random only) <optional>
}