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Rebalance radiation shielding
Squeeze the range of material shielding values. The strongest shielding materials get weaker, and weaker shielding materials, especially low-end ones such as dirt, get stronger. The radioactivity of the active reactor core is increased so that the standard shielding is (still) only narrowly sufficient.
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@ -293,7 +293,7 @@ minetest.register_node("technic:hv_nuclear_reactor_core_active", {
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tiles = {"technic_hv_nuclear_reactor_core.png", "technic_hv_nuclear_reactor_core.png",
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"technic_hv_nuclear_reactor_core.png", "technic_hv_nuclear_reactor_core.png",
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"technic_hv_nuclear_reactor_core.png", "technic_hv_nuclear_reactor_core.png"},
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groups = {cracky=1, technic_machine=1, radioactive=7000, not_in_creative_inventory=1},
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groups = {cracky=1, technic_machine=1, radioactive=11000, not_in_creative_inventory=1},
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legacy_facedir_simple = true,
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sounds = default.node_sound_wood_defaults(),
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drop="technic:hv_nuclear_reactor_core",
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@ -548,14 +548,18 @@ end
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--
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-- Shielding is assessed by sampling every 0.25 m along the path
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-- from the source to the player, ignoring the source node itself.
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-- The summed radiation resistance values from the sampled nodes yield
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-- a measure of the total amount of radiation resistance on the path.
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-- As in reality, shielding causes exponential attenuation of radiation.
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-- However, the effect is scaled down relative to real life: each
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-- metre-point of shielding, corresponding to a real-life halving of
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-- radiation, reduces radiation by 0.01 nepers (a factor of about 1.01).
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-- This scales down the difference between shielded and unshielded safe
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-- distances, avoiding the latter becoming impractically large.
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-- The summed shielding values from the sampled nodes yield a measure
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-- of the total amount of shielding on the path. As in reality,
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-- shielding causes exponential attenuation of radiation. However, the
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-- effect is scaled down relative to real life. A metre of a node with
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-- radiation resistance value R yields attenuation of sqrt(R)*0.1 nepers.
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-- (In real life it would be about R*0.69 nepers, by the definition
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-- of the radiation resistance values.) The sqrt part of this formula
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-- scales down the differences between shielding types, reflecting the
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-- game's simplification of making expensive materials such as gold
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-- readily available in cubic metres. The multiplicative factor in the
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-- formula scales down the difference between shielded and unshielded
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-- safe distances, avoiding the latter becoming impractically large.
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--
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-- Damage is processed at rates down to 0.25 HP/s, which in the absence of
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-- shielding is attained at the distance specified by the "radioactive"
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@ -565,6 +569,7 @@ end
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-- need to be considered.
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local assumed_abdomen_offset = vector.new(0, 1, 0)
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local assumed_abdomen_offset_length = vector.length(assumed_abdomen_offset)
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local cache_scaled_shielding = {}
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minetest.register_abm({
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nodenames = {"group:radioactive"},
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interval = 1,
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@ -578,15 +583,21 @@ minetest.register_abm({
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local dist = math.sqrt(dist_sq)
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local dirstep = dist == 0 and vector.new(0,0,0) or vector.divide(rel, dist*4)
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local intpos = pos
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local resistance = 0
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local shielding = 0
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for intdist = 0.25, dist, 0.25 do
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intpos = vector.add(intpos, dirstep)
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local intnodepos = vector.round(intpos)
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if not vector.equals(intnodepos, pos) then
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resistance = resistance + node_radiation_resistance(minetest.get_node(intnodepos).name)
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local sname = minetest.get_node(intnodepos).name
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local sval = cache_scaled_shielding[sname]
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if not sval then
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sval = math.sqrt(node_radiation_resistance(sname)) * -0.025
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cache_scaled_shielding[sname] = sval
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end
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shielding = shielding + sval
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end
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end
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local dmg_rate = 0.25e-6 * strength*strength * math.exp(-0.0025*resistance) / math.max(0.75, dist_sq)
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local dmg_rate = 0.25e-6 * strength*strength * math.exp(shielding) / math.max(0.75, dist_sq)
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if dmg_rate >= 0.25 then
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local dmg_int = math.floor(dmg_rate)
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if math.random() < dmg_rate-dmg_int then
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