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falling_item
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falling_item/init.lua

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-- Minetest: builtin/item.lua (override falling entity with new features)
-- override falling nodes to add damage
local function add_fall_damage(node, damage)
if core.registered_nodes[node] then
local group = core.registered_nodes[node].groups
group.falling_node_damage = damage
core.override_item(node, {groups = group})
else
print (node .. " not found to add falling_node_damage to")
end
end
add_fall_damage("default:sand", 2)
add_fall_damage("default:desert_sand", 2)
add_fall_damage("default:silver_sand", 2)
add_fall_damage("default:gravel", 3)
add_fall_damage("caverealms:coal_dust", 3)
add_fall_damage("tnt:tnt_burning", 4)
--
-- Falling stuff
--
local node_fall_hurt = core.settings:get_bool("node_fall_hurt") ~= false
local delay = 0.1 -- used to simulate lag
local gravity = core.settings:get("movement_gravity") or 9.81
local builtin_shared = ...
local SCALE = 0.667
local facedir_to_euler = {
{y = 0, x = 0, z = 0},
{y = -math.pi/2, x = 0, z = 0},
{y = math.pi, x = 0, z = 0},
{y = math.pi/2, x = 0, z = 0},
{y = math.pi/2, x = -math.pi/2, z = math.pi/2},
{y = math.pi/2, x = math.pi, z = math.pi/2},
{y = math.pi/2, x = math.pi/2, z = math.pi/2},
{y = math.pi/2, x = 0, z = math.pi/2},
{y = -math.pi/2, x = math.pi/2, z = math.pi/2},
{y = -math.pi/2, x = 0, z = math.pi/2},
{y = -math.pi/2, x = -math.pi/2, z = math.pi/2},
{y = -math.pi/2, x = math.pi, z = math.pi/2},
{y = 0, x = 0, z = math.pi/2},
{y = 0, x = -math.pi/2, z = math.pi/2},
{y = 0, x = math.pi, z = math.pi/2},
{y = 0, x = math.pi/2, z = math.pi/2},
{y = math.pi, x = math.pi, z = math.pi/2},
{y = math.pi, x = math.pi/2, z = math.pi/2},
{y = math.pi, x = 0, z = math.pi/2},
{y = math.pi, x = -math.pi/2, z = math.pi/2},
{y = math.pi, x = math.pi, z = 0},
{y = -math.pi/2, x = math.pi, z = 0},
{y = 0, x = math.pi, z = 0},
{y = math.pi/2, x = math.pi, z = 0}
}
local function fall_hurt_check(self, pos)
if self.hurt_toggle then
-- Get damage level from falling_node_damage group
local damage = core.registered_nodes[self.node.name] and
core.registered_nodes[self.node.name].groups.falling_node_damage
if damage then
local all_objects = minetest.get_objects_inside_radius(pos, 0.8)
for _,obj in ipairs(all_objects) do
local name = obj:get_luaentity() and
obj:get_luaentity().name
if (name
and name ~= "__builtin:item"
and name ~= "__builtin:falling_node")
or obj:is_player() then
obj:punch(self.object, 4.0, {
damage_groups = {fleshy = damage}
}, nil)
self.hurt_toggle = false
end
end
end
else
self.hurt_toggle = true
end
end
core.register_entity(":__builtin:falling_node", {
initial_properties = {
visual = "wielditem",
visual_size = {x = SCALE, y = SCALE, z = SCALE},
textures = {},
physical = true,
is_visible = false,
collide_with_objects = false,
collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5}
},
set_node = function(self, node, meta)
self.node = node
meta = meta or {}
self.hurt_toggle = true
if type(meta.to_table) == "function" then
meta = meta:to_table()
end
for _, list in pairs(meta.inventory or {}) do
for i, stack in pairs(list) do
if type(stack) == "userdata" then
list[i] = stack:to_string()
end
end
end
local def = core.registered_nodes[node.name]
if not def then
-- Don't allow unknown nodes to fall
core.log("warning", "Unknown falling node removed at "..
core.pos_to_string(self.object:get_pos()))
self.object:remove()
return
end
self.meta = meta
-- make sure param2 isnt nil
local np2 = node.param2 or 0
-- Cache whether we're supposed to float on water
self.floats = core.get_item_group(node.name, "float") ~= 0
-- Set entity visuals
if def.drawtype == "torchlike" or def.drawtype == "signlike" then
local textures
if def.tiles and def.tiles[1] then
local tile = def.tiles[1]
if type(tile) == "table" then
tile = tile.name
end
if def.drawtype == "torchlike" then
textures = { "("..tile..")^[transformFX", tile }
else
textures = { tile, "("..tile..")^[transformFX" }
end
end
local vsize
if def.visual_scale then
local s = def.visual_scale
vsize = {x = s, y = s, z = s}
end
self.object:set_properties({
is_visible = true,
visual = "upright_sprite",
visual_size = vsize,
textures = textures,
glow = def.light_source
})
elseif def.drawtype == "mesh" then
local itemstring = node.name
if core.is_colored_paramtype(def.paramtype2) then
itemstring = core.itemstring_with_palette(itemstring, np2)
end
local s = (def.visual_scale or 1) * SCALE * 0.5
local vsize = vector.new(s, s, s)
self.object:set_properties({
is_visible = true,
wield_item = itemstring,
visual_size = vsize,
glow = def.light_source
})
elseif def.drawtype ~= "airlike" then
local itemstring = node.name
if core.is_colored_paramtype(def.paramtype2) then
itemstring = core.itemstring_with_palette(itemstring, np2)
end
-- FIXME: solution needed for paramtype2 == "leveled"
local vsize
local s = (def.visual_scale or 1) * SCALE
-- if def.drawtype == "mesh" then
-- s = s * 0.5
-- end
self.object:set_properties({
is_visible = true,
wield_item = itemstring,
visual_size = vector.new(s, s, s),
glow = def.light_source
})
end
-- Set collision box (certain nodeboxes only for now)
local nb_types = {fixed=true, leveled=true, connected=true}
if def.drawtype == "nodebox" and def.node_box and
nb_types[def.node_box.type] and def.node_box.fixed then
local box = table.copy(def.node_box.fixed)
if type(box[1]) == "table" then
box = #box == 1 and box[1] or nil -- We can only use a single box
end
if box then
if def.paramtype2 == "leveled" and (self.node.level or 0) > 0 then
box[5] = -0.5 + self.node.level / 64
end
self.object:set_properties({
collisionbox = box
})
end
end
-- Rotate entity
if def.drawtype == "torchlike" then
self.object:set_yaw(math.pi * 0.25)
elseif ((np2 ~= 0 or def.drawtype == "nodebox" or def.drawtype == "mesh")
and (def.wield_image == "" or def.wield_image == nil))
or def.drawtype == "signlike"
or def.drawtype == "mesh"
or def.drawtype == "normal"
or def.drawtype == "nodebox" then
if (def.paramtype2 == "facedir" or def.paramtype2 == "colorfacedir") then
local fdir = np2 % 32
-- Get rotation from a precalculated lookup table
local euler = facedir_to_euler[fdir + 1]
if euler then
self.object:set_rotation(euler)
end
elseif (def.paramtype2 == "wallmounted"
or def.paramtype2 == "colorwallmounted" or def.drawtype == "signlike") then
local rot = np2 % 8
if (def.drawtype == "signlike"
and def.paramtype2 ~= "wallmounted"
and def.paramtype2 ~= "colorwallmounted") then
-- Change rotation to "floor" by default for non-wallmounted paramtype2
rot = 1
end
local pitch, yaw, roll = 0, 0, 0
if def.drawtype == "nodebox" or def.drawtype == "mesh" then
if rot == 0 then
pitch, yaw = math.pi/2, 0
elseif rot == 1 then
pitch, yaw = -math.pi/2, math.pi
elseif rot == 2 then
pitch, yaw = 0, math.pi/2
elseif rot == 3 then
pitch, yaw = 0, -math.pi/2
elseif rot == 4 then
pitch, yaw = 0, math.pi
end
else
if rot == 1 then
pitch, yaw = math.pi, math.pi
elseif rot == 2 then
pitch, yaw = math.pi/2, math.pi/2
elseif rot == 3 then
pitch, yaw = math.pi/2, -math.pi/2
elseif rot == 4 then
pitch, yaw = math.pi/2, math.pi
elseif rot == 5 then
pitch, yaw = math.pi/2, 0
end
end
if def.drawtype == "signlike" then
pitch = pitch - math.pi/2
if rot == 0 then
yaw = yaw + math.pi/2
elseif rot == 1 then
yaw = yaw - math.pi/2
end
elseif def.drawtype == "mesh"
or def.drawtype == "normal" or def.drawtype == "nodebox" then
if rot >= 0 and rot <= 1 then
roll = roll + math.pi
else
yaw = yaw + math.pi
end
end
self.object:set_rotation({x=pitch, y=yaw, z=roll})
elseif (def.drawtype == "mesh" and def.paramtype2 == "degrotate") then
local p2 = (np2 - (def.place_param2 or 0)) % 240
local yaw = (p2 / 240) * (math.pi * 2)
self.object:set_yaw(yaw)
elseif (def.drawtype == "mesh" and def.paramtype2 == "colordegrotate") then
local p2 = (np2 % 32 - (def.place_param2 or 0) % 32) % 24
local yaw = (p2 / 24) * (math.pi * 2)
self.object:set_yaw(yaw)
end
end
end,
get_staticdata = function(self)
return core.serialize({
node = self.node,
meta = self.meta
})
end,
on_activate = function(self, staticdata)
self.object:set_armor_groups({immortal = 1})
self.object:set_acceleration({x = 0, y = -gravity, z = 0})
local ds = core.deserialize(staticdata)
if ds and ds.node then
self:set_node(ds.node, ds.meta)
elseif ds then
self:set_node(ds)
elseif staticdata ~= "" then
self:set_node({name = staticdata})
end
end,
-- incase falling entity is stuck, punching drops as item to recover
on_punch = function(self, puncher, tflp, tool_caps, dir, damage)
if puncher and puncher:is_player() then
local drops = core.get_node_drops(self.node, "")
for _, dropped_item in pairs(drops) do
core.add_item(self.object:get_pos(), dropped_item)
end
self.object:remove()
end
end,
on_step = function(self, dtime)
-- used to simulate a little lag
self.timer = (self.timer or 0) + dtime
if self.timer < delay then
return
end
self.timer = 0
-- Set gravity and horizontal slowing
self.object:set_acceleration({x = 0, y = -gravity, z = 0})
local vel = self.object:get_velocity()
vel.x = vel.x * 0.95
vel.z = vel.z * 0.95
if vel.x < 0.1 and vel.z < 0.1 then
vel.x = 0
vel.z = 0
end
self.object:set_velocity(vel)
local pos = self.object:get_pos()
-- Position of bottom center point
local below_pos = {x = pos.x, y = pos.y - 0.7, z = pos.z}
-- Check for player/mobs below falling node and hurt them >:D
if node_fall_hurt then
fall_hurt_check(self, below_pos)
end
-- check if falling node has custom function set
local custom = core.registered_items[self.node.name]
and core.registered_items[self.node.name].falling_step
if custom and custom(self, pos, dtime + delay) == false then
return -- skip further checks if false
end
-- Avoid bugs caused by an unloaded node below
local below_node = core.get_node_or_nil(below_pos)
-- Delete on contact with ignore at world edges or return if unloaded
if not below_node then
return
elseif below_node.name == "ignore" then
self.object:remove()
return
end
local below_nodef = core.registered_nodes[below_node.name]
-- Is it a level node we can add to?
if below_nodef and below_nodef.leveled and
below_node.name == self.node.name then
local addlevel = self.node.level
if not addlevel or addlevel <= 0 then
addlevel = below_nodef.leveled
end
if core.add_node_level(below_pos, addlevel) == 0 then
self.object:remove()
return
end
end
-- Stop node if it falls on walkable surface, or floats on water
if (below_nodef and below_nodef.walkable == true)
or (below_nodef
and core.get_item_group(self.node.name, "float") ~= 0
and below_nodef.liquidtype ~= "none") then
self.object:set_velocity({x = 0, y = 0, z = 0})
end
-- Has the fallen node stopped moving ?
if vector.equals(vel, {x = 0, y = 0, z = 0}) then
local npos = self.object:get_pos() if not npos then return end
-- Get node we've landed inside
local cnode = minetest.get_node(npos)
local cdef = core.registered_nodes[cnode.name]
-- If air_equivalent or buildable_to or an attached_node then place
-- node, otherwise drop falling node as an item instead.
if (cdef and cdef.air_equivalent == true)
or (cdef and cdef.buildable_to == true)
or (cdef and cdef.liquidtype ~= "none")
-- or core.get_item_group(cnode.name, "attached_node") ~= 0 then
-- only drop attached nodes if area not protected (torch, rails etc.)
or (core.get_item_group(cnode.name, "attached_node") ~= 0
and not minetest.is_protected(npos, "")) then
-- Are we an attached node ? (grass, flowers, torch)
if core.get_item_group(cnode.name, "attached_node") ~= 0 then
-- Add drops from attached node
local drops = core.get_node_drops(cnode.name, "")
for _, dropped_item in pairs(drops) do
core.add_item(npos, dropped_item)
end
-- Run script hook
for _, callback in pairs(core.registered_on_dignodes) do
callback(npos, cnode)
end
end
-- Round position
npos = vector.round(npos)
-- Place falling entity as node and write any metadata
core.add_node(npos, self.node)
if self.meta then
local meta = core.get_meta(npos)
meta:from_table(self.meta)
end
-- Play placed sound
local def = core.registered_nodes[self.node.name]
if def.sounds and def.sounds.place and def.sounds.place.name then
core.sound_play(def.sounds.place, {pos = npos}, true)
end
-- Just incase we landed on other falling nodes
core.check_for_falling(npos)
else
-- Add drops from falling node
local drops = core.get_node_drops(self.node, "")
for _, dropped_item in pairs(drops) do
core.add_item(npos, dropped_item)
end
end
-- Remove falling entity if it cannot be placed
self.object:remove()
end
end
})
--[[
core.override_item("default:gravel", {
falling_step = function(self, pos, dtime)
print ("Gravel falling!", dtime)
end
})
]]
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