Markus Armbruster
a3ad623b2a
Before 4.0.6, depth charges required no guns, one military, did damage like shell fire from two guns, and used two shells. Missions were not quite consistent with that (bug). 4.0.6 changed depth charges to work exactly like shell fire (but without updating documentation accordingly): require guns and gun crew, non-zero firing range, scale damage and ammunition use with guns. Go back to the old model, but with damage like three guns, to avoid changing the stock game's dd now (three gun damage for two shells). Stock game's af changes from two gun damage for one shell, and nas from four gun damage for two shells. Factor out common depth-charging code into shp_dchrg().
103 lines
3.5 KiB
Perl
103 lines
3.5 KiB
Perl
.TH Concept Damage
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.NA Damage "How much damage stuff does"
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.LV Expert
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.nf
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It is possible to be damaged by shells, bombs, land mines, sea mines,
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and nuclear blasts. This info page shows you how much damage each of
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these things does. In the following formulas, random(x) means a
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random number from 1 to x. Once the damage has been calculated, then
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it is applied. Damage applies to different kinds of things in
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different ways (see below).
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1. Calculating the damage
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Shelling
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You can be shelled by a fort, artillery unit, ship, depth-charge, or torpedo:
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fort damage = guns * eff * (random(30) + 20) / 7
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unit damage = guns * eff * (5 + random(6))
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ship damage = guns * eff * (10 + random(6))
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depth damage = 3 * eff * (10 + random(6))
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torp damage = 40 + random(40) + random(40)
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Note that for forts, a maximum of 7 guns may be fired.
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Bombs
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A plane drops a number of bombs equal to the "load" the plane can carry.
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Each bomb does the following damage:
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blam: 1 + random(6)
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Blam: 5 + random(6)
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BLAM: 8 + random(6)
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When pinbombing a ship, plane, or land unit, damage is doubled.
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Whether you get a blam, Blam, or a BLAM depends on the accuracy of the
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plane and the difficulty of the target (see info bomb).
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Land mines
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Land mines damage commodities by random(20) and land units by 10 + random(20).
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If the land unit is an engineer, then the damags is cut in half.
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Sea mines
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Sea mines damage ships 21 + random(21). If the ship can sweep, then
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the damage is cut in half.
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Nuclear Detonation
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Damage from nuclear detonation uses the following formula. From
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"show nuke stats", you see that each nuke has a certain blast radius
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and %damage. If you are groundbursting, then multiply the radius by
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2/3. If you are airbursting, then multiply the radius by 3/2. Now
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based on the distance from gound zero, the nuke does the following
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amount of damage:
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Groundburst: dam / (dist + 1)
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Airburst: 0.75 * dam - 20 * dist
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For the small, medium, and large nukes currently in the game
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(damage 80, 90, 101 and radius 1, 2, 3) the following damage is obtained:
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Groundburst Airburst
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0 1 0 1 2 3
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small 80 60 40
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med 90 45 68 48 28
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large / 50 76 56 36 16
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2. Applying the damage
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Once you know how much damage the bombs or whatever have done, then
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you apply the damage to what was hit. In the calculations below,
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%damage will never be larger than 100%. If it is, then we just say
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that the %damage was 100%. Once we have the %damage, then we apply it
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as follows:
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new efficiency = (old efficiency) * (1 - %damage / 100)
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For example a 50% ship hit for 10% damage would go down to 45%.
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The following formulas show you how to get %damage from damage. Note
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that these formulas are used in all cases _except_ nuclear damage. In
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the case of nuclear damage, %damage is always equal to damage (except
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for planes hardened in silos which subtract their "hardened" value
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directly from the damage).
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Ship
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%damage = damage / (1 + def / 100)
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Land unit
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%damage = damage * (vul / 100) * (127 / fortification + 127)
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Plane
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%damage = damage
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Sector
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sectdamage = damage / ((sectdef - 2) * eff + 2)
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%damage = (100 * sectdamage / (sectdamage + 100))
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commodities take %damage (bars take no damage and people take 0.4 * %damage)
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land units take 0.3 * %damage
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planes take no damage
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Commodity
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%damage = (100 * damage / (damage + 50))
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bars take no damage
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civs, mil, and uws take 0.4 * %damage
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.fi
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.SA "fire, launch, torpedo, lmine, bomb, Hitchance, Attacking, Combat"
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