Keep two mouse sensitivity curves, A and B. Switch between them, blend from one to the other, or tune a curve with the mouse wheel and apply it when it feels right.

Needs Rebind 3.5.1 or newer on Windows or macOS and Rebind Link, with the mouse and keyboard forwarded through hardware mode. Stop other mouse-movement scripts first. Live hardware use remains unverified.

Set up

Open the package in Rebind, select Options, and start it from the editor toolbar. Curve A starts at normal sensitivity and Curve B at half.

Controls

Key	Action
F7	Switch between A and B immediately
Hold F8	Blend toward the other curve; release to blend back
F9	Turn Motion Layers off or on
Hold F6	Preview changes to the selected curve
1 / 2 / 3 / 4 while holding F6	Pick Base gain / Knee / Transition width / Maximum gain and show its value
Mouse wheel while holding F6	Adjust that setting instead of scrolling
Release F6	Apply the changes
Escape while holding F6	Discard the changes

F7 and F8 do nothing during a preview, and F7 does nothing while F8 is held.

Settings

The Curve A and Curve B tabs each have:

Setting	What it changes
Base gain	Sensitivity for small movements. 1x leaves it unchanged.
Knee	How large a movement must be before sensitivity starts rising
Transition width	How gradually sensitivity rises from Base gain to Maximum gain
Maximum gain	Sensitivity for large movements. Keep it at least as high as Base gain.

Set both gains equal for constant sensitivity. On the Controls tab, Blend duration sets how long F8 takes to blend; 0 makes it immediate. Selected curve and Apply Motion Layers match F7 and F9.

Limits

Movement size is measured per mouse report, not over time, so changing mouse sensitivity (DPI) or polling rate may need retuning. Your computer and app pointer settings also affect the result.
To change F6 to F9, choose four distinct keys from F1 to F12, A to Z, CapsLock, ScrollLock, NumLock, Pause, or Menu. The preview keys (1 to 4 and Escape) can also be digits or Escape. Every key must differ, or the package does not start. Key changes apply while the package runs on Rebind 3.9 or newer; on older versions, restart the package.
Invalid settings turn the effect off, with a warning, until you correct them.
Changing a curve in Options during its preview discards the preview and keeps your Options edit.

Stop

F9 turns off only this package. To stop it, use the editor toolbar or press Left Ctrl + Left Alt + K (Left Control + Left Option + K on macOS) to stop all scripts. Turning it off or stopping it discards an unfinished preview.

Version

main.luau

local PARAMETERS = {
  { "base", "Base gain", 0.05, 10, 0.05, "x" },
  { "knee", "Knee", 0, 1000, 1, " counts/report" },
  { "width", "Transition width", 0.1, 1000, 1, " counts/report" },
  { "maximum", "Maximum gain", 0.05, 10, 0.05, "x" },
}
local schema = {
  enabled = UI.Toggle(
    true,
    { label = "Apply Motion Layers", tab = "Controls" }
  ),
  selected = UI.Select(
    "A",
    { "A", "B" },
    { label = "Selected curve", tab = "Controls" }
  ),
  blendMs = UI.Slider(150, {
    min = 0,
    max = 2000,
    step = 10,
    suffix = " ms",
    label = "Blend duration",
    tab = "Controls",
  }),
  tuneKey = UI.Keybind("F6", { label = "Hold to tune", tab = "Controls" }),
  switchKey = UI.Keybind("F7", { label = "Switch A/B", tab = "Controls" }),
  blendKey = UI.Keybind(
    "F8",
    { label = "Hold to blend to other curve", tab = "Controls" }
  ),
  bypassKey = UI.Keybind(
    "F9",
    { label = "Bypass Motion Layers", tab = "Controls" }
  ),
  cancelKey = UI.Keybind(
    "Escape",
    { label = "Discard preview", tab = "Controls" }
  ),
}
for i, p in PARAMETERS do
  schema["pickKey" .. i] =
    UI.Keybind(tostring(i), { label = "Pick " .. p[2], tab = "Controls" })
end
for _, slot in { "A", "B" } do
  for i, p in PARAMETERS do
    local defaults =
      { if slot == "A" then 1 else 0.5, 5, 20, if slot == "A" then 1 else 0.5 }
    schema[slot .. p[1]] = UI.Slider(defaults[i], {
      min = p[3],
      max = p[4],
      step = p[5],
      suffix = p[6],
      label = p[2],
      tab = "Curve " .. slot,
    })
  end
end
local cfg = UI.Schema(schema)
local keys = { cfg.tuneKey, cfg.switchKey, cfg.blendKey, cfg.bypassKey }
local allowed = {}
for n = 1, 12 do
  allowed["F" .. n] = true
end
for n = 65, 90 do
  allowed[string.char(n)] = true
end
for _, name in { "CapsLock", "ScrollLock", "NumLock", "Pause", "Menu" } do
  allowed[name] = true
end
local used = {}
for _, key in keys do
  if not allowed[key] or used[key] then
    error(
      "Choose four distinct control keys: F1 to F12, A to Z, CapsLock, ScrollLock, NumLock, Pause or Menu."
    )
  end
  used[key] = true
end
-- preview keys may also be digits or Escape, and must differ from the rest
local pickKeys = {}
for i = 1, #PARAMETERS do
  pickKeys[i] = cfg["pickKey" .. i]
end
for n = 0, 9 do
  allowed[tostring(n)] = true
end
allowed.Escape = true
for _, key in
  { pickKeys[1], pickKeys[2], pickKeys[3], pickKeys[4], cfg.cancelKey }
do
  if not allowed[key] or used[key] then
    error(
      "Choose distinct preview keys: digits, F1 to F12, A to Z, Escape, CapsLock, ScrollLock, NumLock, Pause or Menu."
    )
  end
  used[key] = true
end

local held = {}
local draft, snapshot, draftSlot = nil, nil, nil
local parameter = 1
local weight, target = 0, 0
local freshTick = false
local blending = false
local remainderX, remainderY = 0, 0
local invalidNotified = false
local lastEnabled, lastSelected = cfg.enabled, cfg.selected

local function finite(value, low, high)
  return type(value) == "number"
    and value == value
    and value >= low
    and value <= high
end

local function readCurve(slot)
  local curve = {}
  for i, p in PARAMETERS do
    curve[i] = cfg[slot .. p[1]]
  end
  return curve
end

local function validCurve(curve)
  for i, p in PARAMETERS do
    if not finite(curve[i], p[3], p[4]) then
      return false
    end
  end
  return curve[4] >= curve[1]
end

local function selectedWeight()
  return if cfg.selected == "B" then 1 else 0
end

local function reset()
  draft, snapshot, draftSlot = nil, nil, nil
  blending = false
  weight, target = selectedWeight(), selectedWeight()
  freshTick = false
  remainderX, remainderY = 0, 0
end

local function ready()
  if cfg.enabled ~= lastEnabled or cfg.selected ~= lastSelected then
    reset()
    lastEnabled, lastSelected = cfg.enabled, cfg.selected
  end
  local problem = if type(cfg.enabled) ~= "boolean"
    then "Set Apply Motion Layers to on or off."
    elseif
      cfg.selected ~= "A" and cfg.selected ~= "B"
    then "Select curve A or B."
    elseif
      not finite(cfg.blendMs, 0, 2000)
    then "Set blend duration between 0 and 2000 ms."
    elseif
      not validCurve(readCurve("A"))
    then "Check Curve A ranges and keep maximum gain at least base gain."
    elseif
      not validCurve(readCurve("B"))
    then "Check Curve B ranges and keep maximum gain at least base gain."
    else nil
  if problem then
    reset()
    if not invalidNotified then
      UI.Notify("Motion Layers is bypassed. " .. problem, "warning")
      invalidNotified = true
    end
    return false
  end
  invalidNotified = false
  return cfg.enabled
end

local function gain(curve, magnitude)
  local t = math.max(0, math.min(1, (magnitude - curve[2]) / curve[3]))
  return curve[1] + (curve[4] - curve[1]) * t * t * (3 - 2 * t)
end

local function retarget(value)
  target = value
  if cfg.blendMs == 0 then
    weight = target
  end
  -- The next dt includes time before this input callback. Do not charge it.
  freshTick = true
end

local function describe()
  if draft then
    local p = PARAMETERS[parameter]
    UI.Notify(
      string.format(
        "Curve %s: %s = %.2f%s",
        draftSlot,
        p[2],
        draft[parameter],
        p[6]
      ),
      "info"
    )
  end
end

local function accept()
  if not draft or not ready() or not draft then
    return
  end
  local current = readCurve(draftSlot)
  for i = 1, 4 do
    if current[i] ~= snapshot[i] then
      reset()
      UI.Notify(
        "Preview cancelled because this curve changed in settings.",
        "warning"
      )
      return
    end
  end
  if not validCurve(draft) then
    reset()
    return
  end
  for i, p in PARAMETERS do
    if draft[i] ~= snapshot[i] then
      cfg[draftSlot .. p[1]] = draft[i]
    end
  end
  reset()
  UI.Notify("Curve preview applied.", "info")
end

local function bindControl(key, when, down, up)
  Bind(key, {
    when = when,
    action = function()
      if not held[key] then
        held[key] = true
        down()
      end
      return nil
    end,
    release = function()
      held[key] = nil
      if up then
        up()
      end
    end,
  })
end

bindControl(keys[1], function()
  return ready()
end, function()
  reset()
  draftSlot = cfg.selected
  snapshot = readCurve(draftSlot)
  draft = { snapshot[1], snapshot[2], snapshot[3], snapshot[4] }
  describe()
end, accept)

bindControl(keys[2], function()
  return ready()
end, function()
  if draft or held[keys[1]] or held[keys[3]] then
    return
  end
  cfg.selected = if cfg.selected == "A" then "B" else "A"
  ready()
  UI.Notify("Selected curve " .. cfg.selected .. ".", "info")
end)

bindControl(keys[3], function()
  return ready()
end, function()
  if draft or held[keys[1]] then
    return
  end
  blending = true
  retarget(1 - selectedWeight())
end, function()
  if blending then
    blending = false
    if ready() then
      retarget(selectedWeight())
    end
  end
end)

bindControl(keys[4], function()
  return true
end, function()
  cfg.enabled = not (cfg.enabled == true)
  reset()
  lastEnabled = cfg.enabled
  if not cfg.enabled then
    UI.Notify("Motion Layers bypassed.", "info")
  elseif ready() then
    UI.Notify("Motion Layers enabled.", "info")
  end
end)

for i = 1, 4 do
  bindControl(pickKeys[i], function()
    return draft ~= nil
  end, function()
    parameter = i
    describe()
  end)
end
bindControl(cfg.cancelKey, function()
  return draft ~= nil
end, function()
  reset()
  UI.Notify("Curve preview cancelled.", "info")
end)

function OnScroll(delta)
  if not ready() or not draft then
    return true
  end
  if not finite(delta, -1000000, 1000000) then
    return false
  end
  local p = PARAMETERS[parameter]
  local low = if parameter == 4 then draft[1] else p[3]
  local high = if parameter == 1 then draft[4] else p[4]
  draft[parameter] =
    math.max(low, math.min(high, draft[parameter] + delta * p[5]))
  return false
end

function OnMove(dx, dy)
  if not ready() then
    return true
  end
  local magnitude = math.sqrt(dx * dx + dy * dy)
  local factor
  if draft then
    factor = gain(draft, magnitude)
  else
    factor = (1 - weight) * gain(readCurve("A"), magnitude)
      + weight * gain(readCurve("B"), magnitude)
  end
  local x, y = dx * factor + remainderX, dy * factor + remainderY
  local outX = if x >= 0 then math.floor(x + 0.5) else math.ceil(x - 0.5)
  local outY = if y >= 0 then math.floor(y + 0.5) else math.ceil(y - 0.5)
  remainderX, remainderY = x - outX, y - outY
  if outX ~= 0 or outY ~= 0 then
    HID.Move(outX, outY)
  end
  return false
end

function OnTick(dt)
  if not ready() then
    return
  end
  -- Key capture can consume a release before Bind sees it. Never accept there.
  for key in held do
    if not Input.IsDown(key) then
      held[key] = nil
      if key == keys[1] and draft then
        reset()
      end
      if key == keys[3] and blending then
        blending = false
        retarget(selectedWeight())
      end
    end
  end
  if freshTick then
    freshTick = false
    return
  end
  if not finite(dt, 0, 1000000) then
    return
  end
  if cfg.blendMs == 0 then
    weight = target
    return
  end
  local step = dt / cfg.blendMs
  weight += math.max(-step, math.min(step, target - weight))
end

function OnStart()
  reset()
end
function OnBlur()
  reset()
end
function OnFocus()
  reset()
end
function OnStop()
  reset()
end
function OnError(message)
  reset()
  Log.Error(message)
end

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Motion Layers

Readme

Set up

Controls

Settings

Limits

Stop

Files

Reviews