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Singularity Generator rattles when hit #5788

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79 changes: 74 additions & 5 deletions scripts/energysingu.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -13,18 +13,78 @@ local arm3 = piece "arm3"

local smokePiece = { piece "base", piece "arm1", piece "arm2", piece "arm3" }

local spSetUnitRulesParam = Spring.SetUnitRulesParam
local spGetUnitHealth = Spring.GetUnitHealth
local sin = math.sin
local max = math.max
local min = math.min
local abs = math.abs
local rand = math.random

local SPRING = 0.18 -- Pull toward center

@sprunk sprunk Jul 13, 2026

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this will bite us in the ass during some mass string replace action in 15 years

local DAMPING_BASE = 0.4 -- Removes oscillation
local DAMPING_MIN = 0.03
local RATTLE_THRESHOLD = 26 -- elmo range threshold
local ballSize = 0
local ImpulseUpdate = 0
local pendingImpulseX, pendingImpulseY, pendingImpulseZ = 0, 0, 0
local velX, velY, velZ = 0, 0, 0
local ax, ay, az = 0, 0, 0
local offsetX, offsetY, offsetZ = 0, 0, 0
local is_stunned = true
local spSetUnitRulesParam = Spring.SetUnitRulesParam

local function clamp(val, c)
-- c expected to be positive
if val > c then
val = c
elseif val < -c then
val = -c
end
return val
end

local function SizeControl()
local mag = math.random() + 1
local period = math.random()*20 + 15
local mag = rand() + 1
local period = rand()*20 + 15
local t = 0

local sin = math.sin

while true do
-- damage rattle
local deltadistance = (offsetX^2 + offsetY^2 + offsetZ^2)^0.5 -- ignore fake Y
if ImpulseUpdate > 0 then
-- cap velocity, 2*distance*acceleration
-- just ignore the dampening effect the illusion holds
local maxv = 2*(RATTLE_THRESHOLD-deltadistance)*SPRING
velX = clamp(velX + pendingImpulseX, maxv)
velY = clamp(velY + pendingImpulseY, maxv)
velZ = clamp(velZ + pendingImpulseZ, maxv)
ImpulseUpdate, pendingImpulseX, pendingImpulseY, pendingImpulseZ = 0, 0, 0, 0
end
if abs(velX) + abs(velY) + abs(velZ) > 0.1 or abs(offsetX) + abs(offsetY) + abs(offsetZ) > 0.1 then
local health, maxhealth = spGetUnitHealth(unitID)
local rel_hp = health / maxhealth
local DAMPING = max((1.22*rel_hp - 0.22) * DAMPING_BASE, DAMPING_MIN)
ax = -SPRING * offsetX - DAMPING * velX
ay = -SPRING * offsetY - DAMPING * velY
az = -SPRING * offsetZ - DAMPING * velZ

velX = velX + ax
velY = velY + ay
velZ = velZ + az

offsetX = offsetX + velX
offsetY = offsetY + velY
offsetZ = offsetZ + velZ

MultiMove( energyball, x_axis, offsetX, ax*30,
energyball, y_axis, offsetY, ay*30,
energyball, z_axis, offsetZ, az*30)
end

-- shrink ball to fit arms. Considering ballSwellFactor function and size of unit.
ballSize = min(ballSize, 1/14*(deltadistance - 2*RATTLE_THRESHOLD)^2)

-- grow ball
if is_stunned then
if ballSize > 3 then
ballSize = ballSize - 3
Expand All @@ -41,6 +101,7 @@ local function SizeControl()
end
end

-- periodic swell
local ballSwellFactor = 1.13^(sin(t/period)*mag) * (ballSize^2 / 11000)
spSetUnitRulesParam(unitID, "ballSwell", 1.15*ballSwellFactor - 0.1, INLOS)
Scale(energyball, ballSwellFactor)
Expand Down Expand Up @@ -84,6 +145,14 @@ local function Anim()
end
end

function script.HitByWeapon(hitDirx, hitDirz, weaponDefId, inoutDamage)
ImpulseUpdate = inoutDamage
local impulse = inoutDamage^0.6 - 1
pendingImpulseX = pendingImpulseX + hitDirx * impulse
pendingImpulseY = pendingImpulseY + (1.4* rand() - 0.7) * impulse -- fake y impusle
pendingImpulseZ = pendingImpulseZ - hitDirz * impulse
return inoutDamage
end

function script.Create()
Hide(energyball)
Expand Down