--[[
|
Radioactivity
|
|
Radiation resistance represents the extent to which a material
|
attenuates radiation passing through it; i.e., how good a radiation
|
shield it is. This is identified per node type. For materials that
|
exist in real life, the radiation resistance value that this system
|
uses for a node type consisting of a solid cube of that material is the
|
(approximate) number of halvings of ionising radiation that is achieved
|
by a meter of the material in real life. This is approximately
|
proportional to density, which provides a good way to estimate it.
|
Homogeneous mixtures of materials have radiation resistance computed
|
by a simple weighted mean. Note that the amount of attenuation that
|
a material achieves in-game is not required to be (and is not) the
|
same as the attenuation achieved in real life.
|
|
Radiation resistance for a node type may be specified in the node
|
definition, under the key "radiation_resistance". As an interim
|
measure, until node definitions widely include this, this code
|
knows a bunch of values for particular node types in several mods,
|
and values for groups of node types. The node definition takes
|
precedence if it specifies a value. Nodes for which no value at
|
all is known are taken to provide no radiation resistance at all;
|
this is appropriate for the majority of node types. Only node types
|
consisting of a fairly homogeneous mass of material should report
|
non-zero radiation resistance; anything with non-uniform geometry
|
or complex internal structure should show no radiation resistance.
|
Fractional resistance values are permitted.
|
--]]
|
|
local S = technic.getter
|
|
local rad_resistance_node = {
|
["default:brick"] = 13,
|
["default:bronzeblock"] = 45,
|
["default:clay"] = 15,
|
["default:coalblock"] = 9.6,
|
["default:cobble"] = 15,
|
["default:copperblock"] = 46,
|
["default:desert_cobble"] = 15,
|
["default:desert_sand"] = 10,
|
["default:desert_stone"] = 17,
|
["default:desert_stonebrick"] = 17,
|
["default:diamondblock"] = 24,
|
["default:dirt"] = 8.2,
|
["default:dirt_with_grass"] = 8.2,
|
["default:dirt_with_grass_footsteps"] = 8.2,
|
["default:dirt_with_snow"] = 8.2,
|
["default:glass"] = 17,
|
["default:goldblock"] = 170,
|
["default:gravel"] = 10,
|
["default:ice"] = 5.6,
|
["default:lava_flowing"] = 8.5,
|
["default:lava_source"] = 17,
|
["default:mese"] = 21,
|
["default:mossycobble"] = 15,
|
["default:tinblock"] = 37,
|
["pbj_pup:pbj_pup"] = 10000,
|
["pbj_pup:pbj_pup_candies"] = 10000,
|
["gloopblocks:rainbow_block_diagonal"] = 5000,
|
["gloopblocks:rainbow_block_horizontal"] = 10000,
|
["default:nyancat"] = 10000,
|
["default:nyancat_rainbow"] = 10000,
|
["nyancat:nyancat"] = 10000,
|
["nyancat:nyancat_rainbow"] = 10000,
|
["default:obsidian"] = 18,
|
["default:obsidian_glass"] = 18,
|
["default:sand"] = 10,
|
["default:sandstone"] = 15,
|
["default:sandstonebrick"] = 15,
|
["default:snowblock"] = 1.7,
|
["default:steelblock"] = 40,
|
["default:stone"] = 17,
|
["default:stone_with_coal"] = 16,
|
["default:stone_with_copper"] = 20,
|
["default:stone_with_diamond"] = 18,
|
["default:stone_with_gold"] = 34,
|
["default:stone_with_iron"] = 20,
|
["default:stone_with_mese"] = 17,
|
["default:stone_with_tin"] = 19,
|
["default:stonebrick"] = 17,
|
["default:water_flowing"] = 2.8,
|
["default:water_source"] = 5.6,
|
["farming:desert_sand_soil"] = 10,
|
["farming:desert_sand_soil_wet"] = 10,
|
["farming:soil"] = 8.2,
|
["farming:soil_wet"] = 8.2,
|
["glooptest:akalin_crystal_glass"] = 21,
|
["glooptest:akalinblock"] = 40,
|
["glooptest:alatro_crystal_glass"] = 21,
|
["glooptest:alatroblock"] = 40,
|
["glooptest:amethystblock"] = 18,
|
["glooptest:arol_crystal_glass"] = 21,
|
["glooptest:crystal_glass"] = 21,
|
["glooptest:emeraldblock"] = 19,
|
["glooptest:heavy_crystal_glass"] = 21,
|
["glooptest:mineral_akalin"] = 20,
|
["glooptest:mineral_alatro"] = 20,
|
["glooptest:mineral_amethyst"] = 17,
|
["glooptest:mineral_arol"] = 20,
|
["glooptest:mineral_desert_coal"] = 16,
|
["glooptest:mineral_desert_iron"] = 20,
|
["glooptest:mineral_emerald"] = 17,
|
["glooptest:mineral_kalite"] = 20,
|
["glooptest:mineral_ruby"] = 18,
|
["glooptest:mineral_sapphire"] = 18,
|
["glooptest:mineral_talinite"] = 20,
|
["glooptest:mineral_topaz"] = 18,
|
["glooptest:reinforced_crystal_glass"] = 21,
|
["glooptest:rubyblock"] = 27,
|
["glooptest:sapphireblock"] = 27,
|
["glooptest:talinite_crystal_glass"] = 21,
|
["glooptest:taliniteblock"] = 40,
|
["glooptest:topazblock"] = 24,
|
["mesecons_extrawires:mese_powered"] = 21,
|
["moreblocks:cactus_brick"] = 13,
|
["moreblocks:cactus_checker"] = 8.5,
|
["moreblocks:circle_stone_bricks"] = 17,
|
["moreblocks:clean_glass"] = 17,
|
["moreblocks:coal_checker"] = 9.0,
|
["moreblocks:coal_glass"] = 17,
|
["moreblocks:coal_stone"] = 17,
|
["moreblocks:coal_stone_bricks"] = 17,
|
["moreblocks:glow_glass"] = 17,
|
["moreblocks:grey_bricks"] = 15,
|
["moreblocks:iron_checker"] = 11,
|
["moreblocks:iron_glass"] = 17,
|
["moreblocks:iron_stone"] = 17,
|
["moreblocks:iron_stone_bricks"] = 17,
|
["moreblocks:plankstone"] = 9.3,
|
["moreblocks:split_stone_tile"] = 15,
|
["moreblocks:split_stone_tile_alt"] = 15,
|
["moreblocks:stone_tile"] = 15,
|
["moreblocks:super_glow_glass"] = 17,
|
["moreblocks:tar"] = 7.0,
|
["moreblocks:wood_tile"] = 1.7,
|
["moreblocks:wood_tile_center"] = 1.7,
|
["moreblocks:wood_tile_down"] = 1.7,
|
["moreblocks:wood_tile_flipped"] = 1.7,
|
["moreblocks:wood_tile_full"] = 1.7,
|
["moreblocks:wood_tile_left"] = 1.7,
|
["moreblocks:wood_tile_right"] = 1.7,
|
["moreblocks:wood_tile_up"] = 1.7,
|
["moreores:mineral_mithril"] = 18,
|
["moreores:mineral_silver"] = 21,
|
["moreores:mithril_block"] = 26,
|
["moreores:silver_block"] = 53,
|
["snow:snow_brick"] = 2.8,
|
["basic_materials:brass_block"] = 43,
|
["technic:carbon_steel_block"] = 40,
|
["technic:cast_iron_block"] = 40,
|
["technic:chernobylite_block"] = 40,
|
["technic:chromium_block"] = 37,
|
["technic:corium_flowing"] = 40,
|
["technic:corium_source"] = 80,
|
["technic:granite"] = 18,
|
["technic:lead_block"] = 80,
|
["technic:marble"] = 18,
|
["technic:marble_bricks"] = 18,
|
["technic:mineral_chromium"] = 19,
|
["technic:mineral_uranium"] = 71,
|
["technic:mineral_zinc"] = 19,
|
["technic:stainless_steel_block"] = 40,
|
["technic:zinc_block"] = 36,
|
["tnt:tnt"] = 11,
|
["tnt:tnt_burning"] = 11,
|
}
|
local rad_resistance_group = {
|
concrete = 16,
|
tree = 3.4,
|
uranium_block = 500,
|
wood = 1.7,
|
}
|
local cache_radiation_resistance = {}
|
local function node_radiation_resistance(node_name)
|
local resistance = cache_radiation_resistance[node_name]
|
if resistance then
|
return resistance
|
end
|
local def = minetest.registered_nodes[node_name]
|
if not def then
|
cache_radiation_resistance[node_name] = 0
|
return 0
|
end
|
resistance = def.radiation_resistance or
|
rad_resistance_node[node_name]
|
if not resistance then
|
resistance = 0
|
for g, v in pairs(def.groups) do
|
if v > 0 and rad_resistance_group[g] then
|
resistance = resistance + rad_resistance_group[g]
|
end
|
end
|
end
|
resistance = math.sqrt(resistance)
|
cache_radiation_resistance[node_name] = resistance
|
return resistance
|
end
|
|
|
--[[
|
Radioactive nodes cause damage to nearby players. The damage
|
effect depends on the intrinsic strength of the radiation source,
|
the distance between the source and the player, and the shielding
|
effect of the intervening material. These determine a rate of damage;
|
total damage caused is the integral of this over time.
|
|
In the absence of effective shielding, for a specific source the
|
damage rate varies realistically in inverse proportion to the square
|
of the distance. (Distance is measured to the player's abdomen,
|
not to the nominal player position which corresponds to the foot.)
|
However, if the player is inside a non-walkable (liquid or gaseous)
|
radioactive node, the nominal distance could go to zero, yielding
|
infinite damage. In that case, the player's body is displacing the
|
radioactive material, so the effective distance should remain non-zero.
|
We therefore apply a lower distance bound of sqrt(0.75), which is
|
the maximum distance one can get from the node center within the node.
|
|
A radioactive node is identified by being in the "radioactive" group,
|
and the group value signifies the strength of the radiation source.
|
The group value is the distance from a node at which an unshielded
|
player will be damaged by 1 HP/s. Or, equivalently, it is the square
|
root of the damage rate in HP/s that an unshielded player one node
|
away will take.
|
|
Shielding is assessed by adding the shielding values of all nodes
|
between the source node and the player, ignoring the source node itself.
|
As in reality, shielding causes exponential attenuation of radiation.
|
However, the effect is scaled down relative to real life. A node with
|
radiation resistance value R yields attenuation of sqrt(R) * 0.1 nepers.
|
(In real life it would be about R * 0.69 nepers, by the definition
|
of the radiation resistance values.) The sqrt part of this formula
|
scales down the differences between shielding types, reflecting the
|
game's simplification of making expensive materials such as gold
|
readily available in cubes. The multiplicative factor in the
|
formula scales down the difference between shielded and unshielded
|
safe distances, avoiding the latter becoming impractically large.
|
|
Damage is processed at rates down to 0.2 HP/s, which in the absence of
|
shielding is attained at the distance specified by the "radioactive"
|
group value. Computed damage rates below 0.2 HP/s result in no
|
damage at all to the player. This gives the player an opportunity
|
to be safe, and limits the range at which source/player interactions
|
need to be considered.
|
--]]
|
local abdomen_offset = 1
|
local cache_scaled_shielding = {}
|
local rad_dmg_cutoff = 0.2
|
local radiated_players = {}
|
|
local armor_enabled = technic.config:get_bool("enable_radiation_protection")
|
local entity_damage = technic.config:get_bool("enable_entity_radiation_damage")
|
local longterm_damage = technic.config:get_bool("enable_longterm_radiation_damage")
|
|
local function apply_fractional_damage(o, dmg)
|
local dmg_int = math.floor(dmg)
|
-- The closer you are to getting one more damage point,
|
-- the more likely it will be added.
|
if math.random() < dmg - dmg_int then
|
dmg_int = dmg_int + 1
|
end
|
if dmg_int > 0 then
|
local new_hp = math.max(o:get_hp() - dmg_int, 0)
|
o:set_hp(new_hp)
|
return new_hp == 0
|
end
|
return false
|
end
|
|
local function calculate_base_damage(node_pos, object_pos, strength)
|
local shielding = 0
|
local dist = vector.distance(node_pos, object_pos)
|
|
for ray_pos in technic.trace_node_ray(node_pos,
|
vector.direction(node_pos, object_pos), dist) do
|
local shield_name = minetest.get_node(ray_pos).name
|
shielding = shielding + node_radiation_resistance(shield_name) * 0.025
|
end
|
|
local dmg = (strength * strength) /
|
(math.max(0.75, dist * dist) * math.exp(shielding))
|
|
if dmg < rad_dmg_cutoff then return end
|
return dmg
|
end
|
|
local function calculate_damage_multiplier(object)
|
local ag = object.get_armor_groups and object:get_armor_groups()
|
if not ag then
|
return 0
|
end
|
if ag.immortal then
|
return 0
|
end
|
if ag.radiation then
|
return 0.01 * ag.radiation
|
end
|
if ag.fleshy then
|
return math.sqrt(0.01 * ag.fleshy)
|
end
|
return 0
|
end
|
|
local function calculate_object_center(object)
|
if object:is_player() then
|
return {x=0, y=abdomen_offset, z=0}
|
end
|
return {x=0, y=0, z=0}
|
end
|
|
local function dmg_object(pos, object, strength)
|
local obj_pos = vector.add(object:get_pos(), calculate_object_center(object))
|
local mul
|
if armor_enabled or entity_damage then
|
-- we need to check may the object be damaged even if armor is disabled
|
mul = calculate_damage_multiplier(object)
|
if mul == 0 then
|
return
|
end
|
end
|
local dmg = calculate_base_damage(pos, obj_pos, strength)
|
if not dmg then
|
return
|
end
|
if armor_enabled then
|
dmg = dmg * mul
|
end
|
apply_fractional_damage(object, dmg)
|
if longterm_damage and object:is_player() then
|
local pn = object:get_player_name()
|
radiated_players[pn] = (radiated_players[pn] or 0) + dmg
|
end
|
end
|
|
local rad_dmg_mult_sqrt = math.sqrt(1 / rad_dmg_cutoff)
|
local function dmg_abm(pos, node)
|
local strength = minetest.get_item_group(node.name, "radioactive")
|
local max_dist = strength * rad_dmg_mult_sqrt
|
for _, o in pairs(minetest.get_objects_inside_radius(pos,
|
max_dist + abdomen_offset)) do
|
if (entity_damage or o:is_player()) and o:get_hp() > 0 then
|
dmg_object(pos, o, strength)
|
end
|
end
|
end
|
|
if minetest.settings:get_bool("enable_damage") then
|
minetest.register_abm({
|
label = "Radiation damage",
|
nodenames = {"group:radioactive"},
|
interval = 1,
|
chance = 1,
|
action = dmg_abm,
|
})
|
|
if longterm_damage then
|
minetest.register_globalstep(function(dtime)
|
for pn, dmg in pairs(radiated_players) do
|
dmg = dmg - (dtime / 8)
|
local player = minetest.get_player_by_name(pn)
|
local killed
|
if player and dmg > rad_dmg_cutoff then
|
killed = apply_fractional_damage(player, (dmg * dtime) / 8)
|
else
|
dmg = nil
|
end
|
-- on_dieplayer will have already set this if the player died
|
if not killed then
|
radiated_players[pn] = dmg
|
end
|
end
|
end)
|
|
minetest.register_on_dieplayer(function(player)
|
radiated_players[player:get_player_name()] = nil
|
end)
|
end
|
end
|
|
-- Radioactive materials that can result from destroying a reactor
|
local griefing = technic.config:get_bool("enable_corium_griefing")
|
|
for _, state in pairs({"flowing", "source"}) do
|
minetest.register_node("technic:corium_"..state, {
|
description = S(state == "source" and "Corium Source" or "Flowing Corium"),
|
drawtype = (state == "source" and "liquid" or "flowingliquid"),
|
tiles = {{
|
name = "technic_corium_"..state.."_animated.png",
|
animation = {
|
type = "vertical_frames",
|
aspect_w = 16,
|
aspect_h = 16,
|
length = 3.0,
|
},
|
}},
|
special_tiles = {
|
{
|
name = "technic_corium_"..state.."_animated.png",
|
backface_culling = false,
|
animation = {
|
type = "vertical_frames",
|
aspect_w = 16,
|
aspect_h = 16,
|
length = 3.0,
|
},
|
},
|
{
|
name = "technic_corium_"..state.."_animated.png",
|
backface_culling = true,
|
animation = {
|
type = "vertical_frames",
|
aspect_w = 16,
|
aspect_h = 16,
|
length = 3.0,
|
},
|
},
|
},
|
paramtype = "light",
|
paramtype2 = (state == "flowing" and "flowingliquid" or nil),
|
light_source = (state == "source" and 8 or 5),
|
walkable = false,
|
pointable = false,
|
diggable = false,
|
buildable_to = true,
|
drop = "",
|
drowning = 1,
|
liquidtype = state,
|
liquid_alternative_flowing = "technic:corium_flowing",
|
liquid_alternative_source = "technic:corium_source",
|
liquid_viscosity = LAVA_VISC,
|
liquid_renewable = false,
|
damage_per_second = 6,
|
post_effect_color = {a=192, r=80, g=160, b=80},
|
groups = {
|
liquid = 2,
|
hot = 3,
|
igniter = (griefing and 1 or 0),
|
radioactive = (state == "source" and 12 or 6),
|
not_in_creative_inventory = (state == "flowing" and 1 or nil),
|
},
|
})
|
end
|
|
if rawget(_G, "bucket") and bucket.register_liquid then
|
bucket.register_liquid(
|
"technic:corium_source",
|
"technic:corium_flowing",
|
"technic:bucket_corium",
|
"technic_bucket_corium.png",
|
"Corium Bucket"
|
)
|
end
|
|
minetest.register_node("technic:chernobylite_block", {
|
description = S("Chernobylite Block"),
|
tiles = {"technic_chernobylite_block.png"},
|
is_ground_content = true,
|
groups = {cracky=1, radioactive=4, level=2},
|
sounds = default.node_sound_stone_defaults(),
|
light_source = 2,
|
})
|
|
minetest.register_abm({
|
label = "Corium: boil-off water (sources)",
|
nodenames = {"group:water"},
|
neighbors = {"technic:corium_source"},
|
interval = 1,
|
chance = 1,
|
action = function(pos, node)
|
minetest.remove_node(pos)
|
end,
|
})
|
|
minetest.register_abm({
|
label = "Corium: boil-off water (flowing)",
|
nodenames = {"technic:corium_flowing"},
|
neighbors = {"group:water"},
|
interval = 1,
|
chance = 1,
|
action = function(pos, node)
|
minetest.set_node(pos, {name="technic:chernobylite_block"})
|
end,
|
})
|
|
minetest.register_abm({
|
label = "Corium: become chernobylite",
|
nodenames = {"technic:corium_flowing"},
|
interval = 5,
|
chance = (griefing and 10 or 1),
|
action = function(pos, node)
|
minetest.set_node(pos, {name="technic:chernobylite_block"})
|
end,
|
})
|
|
if griefing then
|
minetest.register_abm({
|
label = "Corium: griefing",
|
nodenames = {"technic:corium_source", "technic:corium_flowing"},
|
interval = 4,
|
chance = 4,
|
action = function(pos, node)
|
for _, offset in ipairs({
|
vector.new(1,0,0),
|
vector.new(-1,0,0),
|
vector.new(0,0,1),
|
vector.new(0,0,-1),
|
vector.new(0,-1,0),
|
}) do
|
if math.random(8) == 1 then
|
minetest.dig_node(vector.add(pos, offset))
|
end
|
end
|
end,
|
})
|
end
|
