MouseDeltaSensitivity

NotReplicated

This item is not replicated across Roblox’s server/client boundary.

Value Type: float

Description:

This property determines the sensitivity of the user’s Mouse.

The sensitivity determines the extent to which a movement of the physical mouse translates to a movement of the mouse in-game. This can be used to adjusted how sensitive events tracking mouse movement, like UserInputService/GetMouseDelta|GetMouseDelta, are to mouse movement.

This property does not affect the movement of the mouse icon. Nor does it affect the Camera Sensitivity setting found in the Settings tab of the client’s Settings menu, which also adjusts the sensitivity of events tracking mouse movement.

This property has a maximum value of 10 and a minimum value of 0. A lower value corresponds to lower sensitivity, and a higher value to higher sensitivity.

When sensitivity is 0, events that track the mouse’s movement will still fire but all parameters and properties indicating the change in mouse position will return DataType/Vector2|Vector2.new(), or DataType/Vector3|Vector3.new() in the case of InputObject/Delta|InputObject.Delta. For example, UserInputService/GetMouseDelta|GetMouseDelta will always return (0, 0).

Code Samples

Create a Binoculars Script

This example creates a binoculars script that decreases the player’s Camera/FieldOfView|FieldOfView and UserInputService/MouseDeltaSensitivity|MouseDeltaSensitivity when a player with a UserInputService/MouseEnabled|MouseEnabled left mouse clicks. The script also points the player’s Camera towards the DataType/Vector3|Vector3 world position of the mouse click determined by the Mouse|Mouse’s Mouse/Hit|Mouse.Hit.p property.

When the player left mouse clicks again, the player’s camera reverts back to the a custom Enum/CameraType|CameraType with the same field of view and Camera/CFrame|CFrame as before the player zoomed in with the script.

While the player uses the binoculars, the script locks the player’s mouse to the center of the screen by setting the player’s UserInputType/MouseBehavior|MouseBehavior to LockCenter. The player’s camera moves when the player moves their mouse according to the InputObject/Delta|InputObject.Delta property passed by UserInputService/InputChanged|InputChanged indicating the mouse’s DataType/Vector2|Vector2 change in screen position.

In order for this example to work as expected, it should be placed in a LocalScript.

Expand

local UserInputService = game:GetService("UserInputService")

local Players = game:GetService("Players")
local player = Players.LocalPlayer
local character = player.CharacterAdded:Wait()
local head = character:WaitForChild("Head", false)

local mouse = player:GetMouse()

local zoomed = false
local camera = game.Workspace.CurrentCamera
local target = nil
local originalProperties =
{
	FieldOfView = nil,
	_CFrame = nil,
	MouseBehavior = nil,
	MouseDeltaSensitivity = nil
}

local AngleX,TargetAngleX = 0,0
local AngleY,TargetAngleY = 0,0

-- Reset camera back to CFrame and FieldOfView before zoom
local function ResetCamera()
	target = nil
	camera.CameraType = Enum.CameraType.Custom
	camera.CFrame = originalProperties._CFrame
	camera.FieldOfView = originalProperties.FieldOfView
	
	UserInputService.MouseBehavior = originalProperties.MouseBehavior
	UserInputService.MouseDeltaSensitivity = originalProperties.MouseDeltaSensitivity
end

local function ZoomCamera()
	-- Allow camera to be changed by script
	camera.CameraType = Enum.CameraType.Scriptable
		
	-- Store camera properties before zoom
	originalProperties._CFrame = camera.CFrame
	originalProperties.FieldOfView = camera.FieldOfView
	originalProperties.MouseBehavior = UserInputService.MouseBehavior
	originalProperties.MouseDeltaSensitivity = UserInputService.MouseDeltaSensitivity

	-- Zoom camera
	target = mouse.Hit.p
	local eyesight = head.Position
	camera.CFrame = CFrame.new(eyesight, target)
	camera.Focus = CFrame.new(target)
	camera.FieldOfView = 10
	
	-- Lock and slow down mouse
	UserInputService.MouseBehavior = Enum.MouseBehavior.LockCenter
	UserInputService.MouseDeltaSensitivity = 1
	
	-- Reset zoom angles
	AngleX,TargetAngleX = 0,0
	AngleY,TargetAngleY = 0,0
end

-- Toggle camera zoom/unzoom
local function MouseClick()
	if zoomed then
		-- Unzoom camera
		ResetCamera()
	else
		-- Zoom in camera
		ZoomCamera()
	end
	
	zoomed = not zoomed
end

local cameraRotation = Vector2.new(0,math.rad(-60))
local function MouseMoved(input)
	if zoomed then
		local sensitivity = 0.6		-- anything higher would make looking up and down harder; recommend anything between 0~1
		local smoothness = 0.05		-- recommend anything between 0~1

		local delta = Vector2.new(input.Delta.x/sensitivity,input.Delta.y/sensitivity) * smoothness

		local X = TargetAngleX - delta.y
		local Y = TargetAngleY - delta.x
		TargetAngleX = (X >= 80 and 80) or (X <= -80 and -80) or X
		TargetAngleY = (Y >= 80 and 80) or (Y <= -80 and -80) or Y
		
		AngleX = AngleX + (TargetAngleX - AngleX) *0.35
		AngleY = AngleY + (TargetAngleY - AngleY) *0.15
		
		camera.CFrame = CFrame.new(head.Position, target)
		* CFrame.Angles(0,math.rad(AngleY),0)
		* CFrame.Angles(math.rad(AngleX),0,0)
	end
end

local function InputBegan(input, gameProcessedEvent)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		MouseClick()
	end
end

local function InputChanged(input, gameProcessedEvent)
	if input.UserInputType == Enum.UserInputType.MouseMovement then
		MouseMoved(input)
	end
end

if UserInputService.MouseEnabled then
	UserInputService.InputBegan:Connect(InputBegan)
	UserInputService.InputChanged:Connect(InputChanged)
end

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