MTACamera.lua

-- Camera state
local cameraEnabled = false

-- Camera radius
local sphereRadius = 5

-- Cursor sensitivity
local sensitivity = 100

-- Field of view
local fov = 90

-- Horizontal angle in degree
local angleH = 85

-- Vertical angle in degree
local angleV = 90

function getCameraPositionOffset(h, v)
    -- Transform degrees to radians
    local radV = math.rad(v)
    local radH = math.rad(h)

    -- Calculate these values only once
    local sinH = math.sin(radH)
    local sphereRadiusXY = sphereRadius * sinH

    -- Calculate camera position on sphere around the local player
    local x = math.sin(radV) * sphereRadiusXY
    local y = math.cos(radV) * sphereRadiusXY
    local z = math.cos(radH) * sphereRadius + 1.0

    -- Create the vector for the position offset
    return Vector3(x, y, z)
end

local cameraPositionOffset = getCameraPositionOffset(angleH, angleV)

function setCameraEnabled(enabled)
    enabled = enabled and true or false

    if cameraEnabled == enabled then
        return false
    end

    if cameraEnabled then
        removeEventHandler("onClientCursorMove", root, onClientCursorMove)
        removeEventHandler("onClientPreRender", root, onClientPreRender)
    else
        addEventHandler("onClientCursorMove", root, onClientCursorMove)
        addEventHandler("onClientPreRender", root, onClientPreRender)
    end

    cameraEnabled = enabled

    return true
end

function isCameraEnabled()
    return cameraEnabled
end

function onClientCursorMove(cursorX, cursorY)
    -- Calculate the cursor distance
    local cursorDistanceX = (cursorX - 0.5) * sensitivity
    local cursorDistanceY = (0.5 - cursorY) * sensitivity

    -- Calculate the new vertical angle
    angleV = (angleV + cursorDistanceX) % 360

    -- Calculate the new horizontal angle
    angleH = math.min(179, math.max(1, angleH + cursorDistanceY))

    -- Update the position offset vector
    cameraPositionOffset = getCameraPositionOffset(angleH, angleV)
end

function onClientPreRender()
    -- Get the current position of the local player
    local position = localPlayer:getPosition()

    -- Calculate the camera positions
    local cameraLookAt = position + Vector3(0, 0, 0.75)
    local cameraPosition = position + cameraPositionOffset

    -- Apply the camera matrix
    Camera.setMatrix(cameraPosition, cameraLookAt, 0, fov)
end

addCommandHandler("togglecamera",
    function ()
        -- Toggle the current camera state
        setCameraEnabled(not isCameraEnabled())
    end
)