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fix(spring tolerance): guarantee a minimun movement to goal

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This commit is contained in:
ernisto 2025-10-24 20:00:46 -03:00
parent 9ace23470f
commit fb10fc2b0d
1 changed files with 26 additions and 19 deletions
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45
src/spring.luau
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@ -9,8 +9,6 @@ local update_descendants = graph.update_descendants
local push_scope_as_child_of = graph.push_scope_as_child_of
local UPDATE_RATE = 120
local TOLERANCE = 0.001
local TOLERANCE_VECTOR = vector.create(TOLERANCE, TOLERANCE, TOLERANCE)
type Animatable = number | CFrame | Color3 | UDim | UDim2 | Vector2 | Vector3
@ -232,6 +230,24 @@ local function spring<T>(source: () -> T, period: number?, damping_ratio: number
end, config
end
-- luau vectors have f32 for each component, unlike luau number which is f64
local FLOAT32_MANTISSA_BITS = 23
type float32 = number
local function get_min_step(x: float32)
local _,exponent = math.frexp(x)
local lower_mantissa = math.ldexp(1, -FLOAT32_MANTISSA_BITS - 1)
return math.ldexp(lower_mantissa, exponent)
end
local function get_min_vector_step(goal: vector): vector
return vector.create(
get_min_step(goal.x),
get_min_step(goal.y),
get_min_step(goal.z)
)
end
local function step_springs(dt: number)
for data in springs do
local k, c,
@ -261,9 +277,13 @@ local function step_springs(dt: number)
local v_123 = u_123 + dv_123
local v_456 = u_456 + dv_456
-- guarantee pos < pos + velocity < goal
local a_123 = vector.max(get_min_vector_step(x0_123), vector.abs(v_123) * dt) * vector.sign(v_123)
local a_456 = vector.max(get_min_vector_step(x0_456), vector.abs(v_456) * dt) * vector.sign(v_456)
-- calculate new position
local x_123 = x0_123 + v_123*dt
local x_456 = x0_456 + v_456*dt
local x_123 = x0_123 + a_123
local x_456 = x0_456 + a_456
data.x0_123, data.x0_456 = x_123, x_456
data.v_123, data.v_456 = v_123, v_456
@ -272,21 +292,8 @@ end
local function update_spring_sources()
for data, output in springs do
local x0_123, x1_123, v_123,
x0_456, x1_456, v_456 =
data.x0_123, data.x1_123, data.v_123,
data.x0_456, data.x1_456, data.v_456
local max_difference = vector.max(
vector.abs(x0_123 - x1_123 :: any),
vector.abs(x0_456 - x1_456 :: any),
vector.abs(v_123 :: any),
vector.abs(v_456 :: any),
TOLERANCE_VECTOR
)
if max_difference == TOLERANCE_VECTOR then
-- close enough to target, unshedule spring and set value to target
local x0_123, x0_456 = data.x0_123, data.x0_456
if x0_123 == data.x1_123 and x0_456 == data.x1_456 then
springs[data] = nil
output.cache = data.source_value
else