MineClone5/mods/ENTITIES/mcl_item_entity/init.lua

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--these are lua locals, used for higher performance
local minetest, math, vector, ipairs, pairs = minetest, math, vector, ipairs, pairs
--this is used for the player pool in the sound buffer
local pool = {}
local tick = false
minetest.register_on_authplayer(function(name, ip, is_success)
if not is_success then return end
pool[name] = 0
end)
minetest.register_on_leaveplayer(function(player)
local name
name = player:get_player_name()
pool[name] = nil
end)
local has_awards = minetest.get_modpath("awards")
local mcl_item_entity = {}
--basic settings
local item_drop_settings = {} --settings table
item_drop_settings.dug_buffer = 0.65 -- the warm up period before a dug item can be collected
item_drop_settings.age = 1.0 --how old a dropped item (_insta_collect==false) has to be before collecting
item_drop_settings.fluid_flow_rate = 1.39 --the speed of a flowing fluid, used when computing push and drag forces of water on items; default is tuned to Minecraft
item_drop_settings.fluid_drag = 1.8 --how much drag water has on items (how quickly an item's motion will settle onto the water's flow speed)
item_drop_settings.ground_drag = 3.0 --how much friction with the ground slows items sliding on it
item_drop_settings.slippery_drag_factor = 0.25 --scales item friction with the ground on slippery floors (e.g. ice)
item_drop_settings.slippery_fluid_drag_factor = 0.4 --scales item drag with waterflow on slippery floors (e.g. ice)
item_drop_settings.radius_magnet = 2.0 --radius of item magnet. MUST BE LARGER THAN radius_collect!
item_drop_settings.xp_radius_magnet = 7.25 --radius of xp magnet. MUST BE LARGER THAN radius_collect!
item_drop_settings.radius_collect = 0.2 --radius of collection
item_drop_settings.player_collect_height = 0.8 --added to their pos y value
item_drop_settings.collection_safety = false --do this to prevent items from flying away on laggy servers
item_drop_settings.random_item_velocity = true --this sets random item velocity if velocity is 0
item_drop_settings.drop_single_item = false --if true, the drop control drops 1 item instead of the entire stack, and sneak+drop drops the stack
-- drop_single_item is disabled by default because it is annoying to throw away items from the intentory screen
item_drop_settings.magnet_time = 0.75 -- how many seconds an item follows the player before giving up
local is_player = mcl_util.is_player
local function get_gravity()
return tonumber(minetest.settings:get("movement_gravity")) or 9.81
end
local registered_pickup_achievement = {}
--TODO: remove limitation of 1 award per itemname
function mcl_item_entity.register_pickup_achievement(itemname, award)
if not has_awards then
minetest.log("warning", "[mcl_item_entity] Trying to register pickup achievement ["..award.."] for ["..itemname.."] while awards missing")
elseif registered_pickup_achievement[itemname] then
minetest.log("error", "[mcl_item_entity] Trying to register already existing pickup achievement ["..award.."] for ["..itemname.."]")
else
registered_pickup_achievement[itemname] = award
end
end
mcl_item_entity.register_pickup_achievement("tree", "mcl:mineWood")
mcl_item_entity.register_pickup_achievement("mcl_mobitems:blaze_rod", "mcl:blazeRod")
mcl_item_entity.register_pickup_achievement("mcl_mobitems:leather", "mcl:killCow")
mcl_item_entity.register_pickup_achievement("mcl_core:diamond", "mcl:diamonds")
local function check_pickup_achievements(object, player)
if has_awards then
local itemname = ItemStack(object:get_luaentity().itemstring):get_name()
local playername = player:get_player_name()
for name,award in pairs(registered_pickup_achievement) do
if itemname == name or minetest.get_item_group(itemname, name) ~= 0 then
awards.unlock(playername, award)
end
end
end
end
local function enable_physics(object, luaentity, ignore_check)
if luaentity.physical_state == false or ignore_check == true then
luaentity.physical_state = true
object:set_properties({
physical = true
})
object:set_velocity({x=0,y=0,z=0})
object:set_acceleration({x=0,y=-get_gravity(),z=0})
end
end
local function disable_physics(object, luaentity, ignore_check, reset_movement)
if luaentity.physical_state == true or ignore_check == true then
luaentity.physical_state = false
object:set_properties({
physical = false
})
if reset_movement ~= false then
object:set_velocity({x=0,y=0,z=0})
object:set_acceleration({x=0,y=0,z=0})
end
end
end
minetest.register_globalstep(function(dtime)
tick = not tick
for _,player in pairs(minetest.get_connected_players()) do
if player:get_hp() > 0 or not minetest.settings:get_bool("enable_damage") then
local name = player:get_player_name()
local pos = player:get_pos()
if tick == true and pool[name] > 0 then
minetest.sound_play("item_drop_pickup", {
pos = pos,
gain = 0.7,
max_hear_distance = 16,
pitch = math.random(70,110)/100
})
if pool[name] > 6 then
pool[name] = 6
else
pool[name] = pool[name] - 1
end
end
local inv = player:get_inventory()
local checkpos = {x=pos.x,y=pos.y + item_drop_settings.player_collect_height,z=pos.z}
--magnet and collection
for _,object in pairs(minetest.get_objects_inside_radius(checkpos, item_drop_settings.xp_radius_magnet)) do
if not is_player(object) and vector.distance(checkpos, object:get_pos()) < item_drop_settings.radius_magnet and object:get_luaentity() and object:get_luaentity().name == "__builtin:item" and object:get_luaentity()._magnet_timer and (object:get_luaentity()._insta_collect or (object:get_luaentity().age > item_drop_settings.age)) then
if object:get_luaentity()._magnet_timer >= 0 and object:get_luaentity()._magnet_timer < item_drop_settings.magnet_time and inv and inv:room_for_item("main", ItemStack(object:get_luaentity().itemstring)) then
-- Collection
if not object:get_luaentity()._removed then
-- Ignore if itemstring is not set yet
if object:get_luaentity().itemstring ~= "" then
inv:add_item("main", ItemStack(object:get_luaentity().itemstring))
check_pickup_achievements(object, player)
-- Destroy entity
-- This just prevents this section to be run again because object:remove() doesn't remove the item immediately.
object:get_luaentity().target = checkpos
object:get_luaentity()._removed = true
object:set_velocity({x=0,y=0,z=0})
object:set_acceleration({x=0,y=0,z=0})
object:move_to(checkpos)
pool[name] = pool[name] + 1
minetest.after(0.25, function()
--safety check
if object and object:get_luaentity() then
object:remove()
end
end)
end
end
end
elseif not is_player(object) and object:get_luaentity() and object:get_luaentity().name == "mcl_experience:orb" then
local entity = object:get_luaentity()
entity.collector = player:get_player_name()
entity.collected = true
end
end
end
end
end)
-- Stupid workaround to get drops from a drop table:
-- Create a temporary table in minetest.registered_nodes that contains the proper drops,
-- because unfortunately minetest.get_node_drops needs the drop table to be inside a registered node definition
-- (very ugly)
local tmp_id = 0
local function get_drops(drop, toolname, param2, paramtype2)
tmp_id = tmp_id + 1
local tmp_node_name = "mcl_item_entity:" .. tmp_id
minetest.registered_nodes[tmp_node_name] = {
name = tmp_node_name,
drop = drop,
paramtype2 = paramtype2
}
local drops = minetest.get_node_drops({name = tmp_node_name, param2 = param2}, toolname)
minetest.registered_nodes[tmp_node_name] = nil
return drops
end
local function discrete_uniform_distribution(drops, min_count, max_count, cap)
local new_drops = table.copy(drops)
for i, item in ipairs(drops) do
local new_item = ItemStack(item)
local multiplier = math.random(min_count, max_count)
if cap then
multiplier = math.min(cap, multiplier)
end
new_item:set_count(multiplier * new_item:get_count())
new_drops[i] = new_item
end
return new_drops
end
local function get_fortune_drops(fortune_drops, fortune_level)
local drop
local i = fortune_level
repeat
drop = fortune_drops[i]
i = i - 1
until drop or i < 1
return drop or {}
end
local doTileDrops = minetest.settings:get_bool("mcl_doTileDrops", true)
function minetest.handle_node_drops(pos, drops, digger)
-- NOTE: This function override allows digger to be nil.
-- This means there is no digger. This is a special case which allows this function to be called
-- by hand. Creative Mode is intentionally ignored in this case.
if (digger and is_player(digger) and minetest.is_creative_enabled(digger:get_player_name())) or doTileDrops == false then
return
end
-- Check if node will yield its useful drop by the digger's tool
local dug_node = minetest.get_node(pos)
local tooldef
local tool
if digger then
tool = digger:get_wielded_item()
tooldef = minetest.registered_tools[tool:get_name()]
if not mcl_autogroup.can_harvest(dug_node.name, tool:get_name()) then
return
end
end
local diggroups = tooldef and tooldef._mcl_diggroups
local shearsy_level = diggroups and diggroups.shearsy and diggroups.shearsy.level
--[[ Special node drops when dug by shears by reading _mcl_shears_drop or with a silk touch tool reading _mcl_silk_touch_drop
from the node definition.
Definition of _mcl_shears_drop / _mcl_silk_touch_drop:
* true: Drop itself when dug by shears / silk touch tool
* table: Drop every itemstring in this table when dug by shears _mcl_silk_touch_drop
]]
local enchantments = tool and mcl_enchanting.get_enchantments(tool, "silk_touch")
local silk_touch_drop = false
local nodedef = minetest.registered_nodes[dug_node.name]
if shearsy_level and shearsy_level > 0 and nodedef._mcl_shears_drop then
if nodedef._mcl_shears_drop == true then
drops = { dug_node.name }
else
drops = nodedef._mcl_shears_drop
end
elseif tool and enchantments.silk_touch and nodedef._mcl_silk_touch_drop then
silk_touch_drop = true
if nodedef._mcl_silk_touch_drop == true then
drops = { dug_node.name }
else
drops = nodedef._mcl_silk_touch_drop
end
end
if tool and nodedef._mcl_fortune_drop and enchantments.fortune then
local fortune_level = enchantments.fortune
local fortune_drop = nodedef._mcl_fortune_drop
if fortune_drop.discrete_uniform_distribution then
local min_count = fortune_drop.min_count
local max_count = fortune_drop.max_count + fortune_level * (fortune_drop.factor or 1)
local chance = fortune_drop.chance or fortune_drop.get_chance and fortune_drop.get_chance(fortune_level)
if not chance or math.random() < chance then
drops = discrete_uniform_distribution(fortune_drop.multiply and drops or fortune_drop.items, min_count, max_count, fortune_drop.cap)
elseif fortune_drop.override then
drops = {}
end
else
-- Fixed Behavior
local drop = get_fortune_drops(fortune_drop, fortune_level)
drops = get_drops(drop, tool:get_name(), dug_node.param2, nodedef.paramtype2)
end
end
if digger and mcl_experience.throw_xp and not silk_touch_drop then
local experience_amount = minetest.get_item_group(dug_node.name,"xp")
if experience_amount > 0 then
mcl_experience.throw_xp(pos, experience_amount)
end
end
for _,item in ipairs(drops) do
local count
if type(item) == "string" then
count = ItemStack(item):get_count()
else
count = item:get_count()
end
local drop_item = ItemStack(item)
drop_item:set_count(1)
for i=1,count do
local dpos = table.copy(pos)
-- Apply offset for plantlike_rooted nodes because of their special shape
if nodedef and nodedef.drawtype == "plantlike_rooted" and nodedef.walkable then
dpos.y = dpos.y + 1
end
-- Spawn item and apply random speed
local obj = minetest.add_item(dpos, drop_item)
if obj then
local x = math.random(1, 5)
if math.random(1,2) == 1 then
x = -x
end
local z = math.random(1, 5)
if math.random(1,2) == 1 then
z = -z
end
obj:set_velocity({x=1/x, y=obj:get_velocity().y, z=1/z})
obj:get_luaentity().age = item_drop_settings.dug_buffer
obj:get_luaentity()._insta_collect = false
end
end
end
end
-- Drop single items by default
function minetest.item_drop(itemstack, dropper, pos)
if dropper and is_player(dropper) then
local v = dropper:get_look_dir()
local p = {x=pos.x, y=pos.y+1.2, z=pos.z}
local cs = itemstack:get_count()
if dropper:get_player_control().sneak then
cs = 1
end
local item = itemstack:take_item(cs)
local obj = minetest.add_item(p, item)
if obj then
v.x = v.x*4
v.y = v.y*4 + 2
v.z = v.z*4
obj:set_velocity(v)
-- Force collection delay
obj:get_luaentity()._insta_collect = false
return itemstack
end
end
end
--modify builtin:item
local time_to_live = tonumber(minetest.settings:get("item_entity_ttl"))
if not time_to_live then
time_to_live = 300
end
local function cxcz(o, cw, one, zero)
if cw < 0 then
table.insert(o, { [one]=1, y=0, [zero]=0 })
table.insert(o, { [one]=-1, y=0, [zero]=0 })
else
table.insert(o, { [one]=-1, y=0, [zero]=0 })
table.insert(o, { [one]=1, y=0, [zero]=0 })
end
return o
end
minetest.register_entity(":__builtin:item", {
initial_properties = {
hp_max = 1,
physical = true,
collide_with_objects = false,
collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
pointable = false,
visual = "wielditem",
visual_size = {x = 0.4, y = 0.4},
textures = {""},
spritediv = {x = 1, y = 1},
initial_sprite_basepos = {x = 0, y = 0},
is_visible = false,
infotext = "",
},
-- Itemstring of dropped item. The empty string is used when the item is not yet initialized yet.
-- The itemstring MUST be set immediately to a non-empty string after creating the entity.
-- The hand is NOT permitted as dropped item. ;-)
-- Item entities will be deleted if they still have an empty itemstring on their first on_step tick.
itemstring = "",
-- If true, item will fall
physical_state = true,
-- If item entity is currently flowing in water
_flowing = false,
-- Number of seconds this item entity has existed so far
age = 0,
-- How old it has become in the collection animation
collection_age = 0,
set_item = function(self, itemstring)
self.itemstring = itemstring
if self.itemstring == "" then
-- item not yet known
return
end
local stack = ItemStack(itemstring)
if minetest.get_item_group(stack:get_name(), "compass") > 0 then
stack:set_name("mcl_compass:16")
itemstring = stack:to_string()
self.itemstring = itemstring
end
if minetest.get_item_group(stack:get_name(), "clock") > 0 then
self.is_clock = true
end
local count = stack:get_count()
local max_count = stack:get_stack_max()
if count > max_count then
count = max_count
self.itemstring = stack:get_name().." "..max_count
end
local itemtable = stack:to_table()
local itemname = nil
local description = ""
if itemtable then
itemname = stack:to_table().name
end
local glow
local def = minetest.registered_items[itemname]
if def then
description = def.description
glow = def.light_source
end
local s = 0.2 + 0.1 * (count / max_count)
local wield_scale = (def and def.wield_scale and def.wield_scale.x) or 1
local c = s
s = s / wield_scale
local prop = {
is_visible = true,
visual = "wielditem",
textures = {itemname},
visual_size = {x = s, y = s},
collisionbox = {-c, -c, -c, c, c, c},
automatic_rotate = math.pi * 0.5,
infotext = description,
glow = glow,
}
self.object:set_properties(prop)
if item_drop_settings.random_item_velocity == true then
minetest.after(0, function(self)
if not self or not self.object or not self.object:get_luaentity() then
return
end
local vel = self.object:get_velocity()
if vel and vel.x == 0 and vel.z == 0 then
local x = math.random(1, 5)
if math.random(1,2) == 1 then
x = -x
end
local z = math.random(1, 5)
if math.random(1,2) == 1 then
z = -z
end
local y = math.random(2,4)
self.object:set_velocity({x=1/x, y=y, z=1/z})
end
end, self)
end
end,
get_staticdata = function(self)
local data = minetest.serialize({
itemstring = self.itemstring,
always_collect = self.always_collect,
age = self.age,
_insta_collect = self._insta_collect,
_flowing = self._flowing,
_removed = self._removed,
})
-- sfan5 guessed that the biggest serializable item
-- entity would have a size of 65530 bytes. This has
-- been experimentally verified to be still too large.
--
-- anon5 has calculated that the biggest serializable
-- item entity has a size of exactly 65487 bytes:
--
-- 1. serializeString16 can handle max. 65535 bytes.
-- 2. The following engine metadata is always saved:
-- • 1 byte (version)
-- • 2 byte (length prefix)
-- • 14 byte “__builtin:item”
-- • 4 byte (length prefix)
-- • 2 byte (health)
-- • 3 × 4 byte = 12 byte (position)
-- • 4 byte (yaw)
-- • 1 byte (version 2)
-- • 2 × 4 byte = 8 byte (pitch and roll)
-- 3. This leaves 65487 bytes for the serialization.
if #data > 65487 then -- would crash the engine
local stack = ItemStack(self.itemstring)
stack:get_meta():from_table(nil)
self.itemstring = stack:to_string()
minetest.log(
"warning",
"Overlong item entity metadata removed: “" ..
self.itemstring ..
"” had serialized length of " ..
#data
)
return self:get_staticdata()
end
return data
end,
on_activate = function(self, staticdata, dtime_s)
if string.sub(staticdata, 1, string.len("return")) == "return" then
local data = minetest.deserialize(staticdata)
if data and type(data) == "table" then
self.itemstring = data.itemstring
self.always_collect = data.always_collect
if data.age then
self.age = data.age + dtime_s
else
self.age = dtime_s
end
--remember collection data
-- If true, can collect item without delay
self._insta_collect = data._insta_collect
self._flowing = data._flowing
self._removed = data._removed
end
else
self.itemstring = staticdata
end
if self._removed then
self._removed = true
self.object:remove()
return
end
if self._insta_collect == nil then
-- Intentionally default, since delayed collection is rare
self._insta_collect = true
end
if self._flowing == nil then
self._flowing = false
end
self._magnet_timer = 0
self._magnet_active = false
-- How long ago the last possible collector was detected. nil = none in this session
self._collector_timer = nil
-- Used to apply additional force
self._force = nil
self._forcestart = nil
self._forcetimer = 0
self.object:set_armor_groups({immortal = 1})
self.object:set_velocity({x = 0, y = 2, z = 0})
self.object:set_acceleration({x = 0, y = -get_gravity(), z = 0})
self:set_item(self.itemstring)
end,
try_merge_with = function(self, own_stack, object, entity)
if self.age == entity.age or entity._removed then
-- Can not merge with itself and remove entity
return false
end
local stack = ItemStack(entity.itemstring)
local name = stack:get_name()
if own_stack:get_name() ~= name or
own_stack:get_meta() ~= stack:get_meta() or
own_stack:get_wear() ~= stack:get_wear() or
own_stack:get_free_space() == 0 then
-- Can not merge different or full stack
return false
end
local count = own_stack:get_count()
local total_count = stack:get_count() + count
local max_count = stack:get_stack_max()
if total_count > max_count then
return false
end
-- Merge the remote stack into this one
local pos = object:get_pos()
pos.y = pos.y + ((total_count - count) / max_count) * 0.15
self.object:move_to(pos)
self.age = 0 -- Handle as new entity
own_stack:set_count(total_count)
self:set_item(own_stack:to_string())
entity._removed = true
object:remove()
return true
end,
on_step = function(self, dtime, moveresult)
if self._removed then
self.object:set_properties({
physical = false
})
self.object:set_velocity({x=0,y=0,z=0})
self.object:set_acceleration({x=0,y=0,z=0})
return
end
self.age = self.age + dtime
if self._collector_timer then
self._collector_timer = self._collector_timer + dtime
end
if time_to_live > 0 and self.age > time_to_live then
self._removed = true
self.object:remove()
return
end
-- Delete corrupted item entities. The itemstring MUST be non-empty on its first step,
-- otherwise there might have some data corruption.
if self.itemstring == "" then
minetest.log("warning", "Item entity with empty itemstring found at "..minetest.pos_to_string(self.object:get_pos()).. "! Deleting it now.")
self._removed = true
self.object:remove()
return
end
local p = self.object:get_pos()
local node = minetest.get_node_or_nil(p)
local in_unloaded = (node == nil)
if self.is_clock then
self.object:set_properties({
textures = {"mcl_clock:clock_" .. (mcl_worlds.clock_works(p) and mcl_clock.old_time or mcl_clock.random_frame)}
})
end
-- If no collector was found for a long enough time, declare the magnet as disabled
if self._magnet_active and (self._collector_timer == nil or (self._collector_timer > item_drop_settings.magnet_time)) then
self._magnet_active = false
enable_physics(self.object, self)
return
end
if in_unloaded then
-- Don't infinetly fall into unloaded map
disable_physics(self.object, self)
return
end
-- Destroy item in lava, fire or special nodes
local nn = node.name
local def = minetest.registered_nodes[nn]
local lg = minetest.get_item_group(nn, "lava")
local fg = minetest.get_item_group(nn, "fire")
local dg = minetest.get_item_group(nn, "destroys_items")
if (def and (lg ~= 0 or fg ~= 0 or dg == 1)) then
--Wait 2 seconds to allow mob drops to be cooked, & picked up instead of instantly destroyed.
if self.age > 2 then
if dg ~= 2 then
minetest.sound_play("builtin_item_lava", {pos = self.object:get_pos(), gain = 0.5})
end
self._removed = true
self.object:remove()
return
end
end
-- Destroy item when it collides with a cactus
if moveresult and moveresult.collides then
for _, collision in pairs(moveresult.collisions) do
local pos = collision.node_pos
if collision.type == "node" and minetest.get_node(pos).name == "mcl_core:cactus" then
self._removed = true
self.object:remove()
return
end
end
end
-- Push item out when stuck inside solid opaque node
if def and def.walkable and def.groups and def.groups.opaque == 1 then
local shootdir
local cx = (p.x % 1) - 0.5
local cz = (p.z % 1) - 0.5
local order = {}
-- First prepare the order in which the 4 sides are to be checked.
-- 1st: closest
-- 2nd: other direction
-- 3rd and 4th: other axis
if math.abs(cx) < math.abs(cz) then
order = cxcz(order, cx, "x", "z")
order = cxcz(order, cz, "z", "x")
else
order = cxcz(order, cz, "z", "x")
order = cxcz(order, cx, "x", "z")
end
-- Check which one of the 4 sides is free
for o=1, #order do
local nn = minetest.get_node(vector.add(p, order[o])).name
local def = minetest.registered_nodes[nn]
if def and def.walkable == false and nn ~= "ignore" then
shootdir = order[o]
break
end
end
-- If none of the 4 sides is free, shoot upwards
if shootdir == nil then
shootdir = { x=0, y=1, z=0 }
local nn = minetest.get_node(vector.add(p, shootdir)).name
if nn == "ignore" then
-- Do not push into ignore
return
end
end
-- Set new item moving speed accordingly
local newv = vector.multiply(shootdir, 3)
self.object:set_acceleration({x = 0, y = 0, z = 0})
self.object:set_velocity(newv)
disable_physics(self.object, self, false, false)
if shootdir.y == 0 then
self._force = newv
p.x = math.floor(p.x)
p.y = math.floor(p.y)
p.z = math.floor(p.z)
self._forcestart = p
self._forcetimer = 1
end
return
end
-- This code is run after the entity got a push from above “push away” code.
-- It is responsible for making sure the entity is entirely outside the solid node
-- (with its full collision box), not just its center.
if self._forcetimer > 0 then
local cbox = self.object:get_properties().collisionbox
local ok = false
if self._force.x > 0 and (p.x > (self._forcestart.x + 0.5 + (cbox[4] - cbox[1])/2)) then ok = true
elseif self._force.x < 0 and (p.x < (self._forcestart.x + 0.5 - (cbox[4] - cbox[1])/2)) then ok = true
elseif self._force.z > 0 and (p.z > (self._forcestart.z + 0.5 + (cbox[6] - cbox[3])/2)) then ok = true
elseif self._force.z < 0 and (p.z < (self._forcestart.z + 0.5 - (cbox[6] - cbox[3])/2)) then ok = true end
-- Item was successfully forced out. No more pushing
if ok then
self._forcetimer = -1
self._force = nil
enable_physics(self.object, self)
else
self._forcetimer = self._forcetimer - dtime
end
return
elseif self._force then
self._force = nil
enable_physics(self.object, self)
return
end
-- Move item around on flowing liquids
if def and def.liquidtype == "flowing" then
--[[ Get flowing direction (function call from flowlib), if there's a liquid.
NOTE: According to Qwertymine, flowlib.quickflow is only reliable for liquids with a flowing distance of 7.
Luckily, this is exactly what we need if we only care about water, which has this flowing distance. ]]
local vec = flowlib.quick_flow(p, node)
-- Just to make sure we don't manipulate the speed for no reason
if vec.x ~= 0 or vec.y ~= 0 or vec.z ~= 0 then
-- Minecraft Wiki: Flowing speed is "about 1.39 meters per second"
local f = item_drop_settings.fluid_flow_rate --1.39
-- Apply the force of the flowing liquid onto the item's velocity
local newv = vector.multiply(vec, f)
self.object:set_acceleration({x = 0, y = 0, z = 0})
local oldvel = self.object:get_velocity() -- v is vector, vel is velocity
-- drag
local fluid_drag = item_drop_settings.fluid_drag
local floornn = minetest.get_node({x=p.x, y=p.y-0.5, z=p.z}).name
local floornode = floornn and minetest.registered_nodes[floornn]
if floornode and minetest.get_item_group(floornode.name, "slippery") then
-- scale fluid drag on slippery floors
fluid_drag = fluid_drag * item_drop_settings.slippery_fluid_drag_factor
end
newv.x = newv.x - (oldvel.x - newv.x) * fluid_drag * dtime
newv.y = newv.y - (oldvel.y - newv.y) * fluid_drag * dtime
newv.z = newv.z - (oldvel.z - newv.z) * fluid_drag * dtime
newv.y = newv.y + -0.22 -- (keep slight downward thrust from previous version of code)
-- NOTE: is there any particular reason we have this, anyway?
-- since fluid drag is now on, we could as well just
-- apply gravity here; drag will slow down the fall
-- realistically
self.object:set_velocity({x = oldvel.x + newv.x * dtime, y = oldvel.y + newv.y * dtime, z = oldvel.z + newv.z * dtime})
self.physical_state = true
self._flowing = true
self.object:set_properties({
physical = true
})
return
end
elseif self._flowing == true then
-- Disable flowing physics if not on/in flowing liquid
self._flowing = false
--enable_physics(self.object, self, true) -- do not reset velocity upon leaving water!
self.object:set_acceleration({x=0,y=-get_gravity(),z=0}) -- resume applying gravity
return
end
-- If node is not registered or node is walkably solid and resting on nodebox
local nn = minetest.get_node({x=p.x, y=p.y-0.5, z=p.z}).name
local v = self.object:get_velocity()
local node = nn and minetest.registered_nodes[nn]
if not node or node.walkable and v.y == 0 then
if self.physical_state then
local own_stack = ItemStack(self.object:get_luaentity().itemstring)
-- Merge with close entities of the same item
for _, object in pairs(minetest.get_objects_inside_radius(p, 0.8)) do
local obj = object:get_luaentity()
if obj and obj.name == "__builtin:item"
and obj.physical_state == false then
if self:try_merge_with(own_stack, object, obj) then
return
end
end
end
--disable_physics(self.object, self)
-- apply ground drag
local oldvel = self.object:get_velocity()
-- ignore momentum if it's tiny
if math.abs(oldvel.x) < 0.05 and math.abs(oldvel.z) < 0.05 then
disable_physics(self.object, self)
return
end
local ground_drag = item_drop_settings.ground_drag
if node and minetest.get_item_group(node.name, "slippery") ~= 0 then
ground_drag = ground_drag * item_drop_settings.slippery_drag_factor
end
local newvel = {
x = oldvel.x - oldvel.x * ground_drag * dtime,
y = 0,
z = oldvel.z - oldvel.z * ground_drag * dtime
}
self.object:set_velocity(newvel)
end
else
if self._magnet_active == false then
enable_physics(self.object, self)
end
end
end,
-- Note: on_punch intentionally left out. The player should *not* be able to collect items by punching
})