local gMe = getLocalPlayer()
local gLastTick = nil

local TUBE_RADIUS = 5
local TOWARD_LINE_FACTOR = 0.001
local ALONG_LINE_FACTOR = 0.0003

local gLines = {
    { vec(0, 0, 3), vec(0, 10, 10) }
}

addEventHandler('onClientResourceStart', resourceRoot,
    function()

        for i,line in ipairs(gLines) do
            line.length = (line[2] - line[1]):len()
            line.dir = (line[2] - line[1]):normalize()
        end
    end
)

addEventHandler('onClientRender', root,
    function()
        local vehicle = getPedOccupiedVehicle(gMe)
        if not vehicle then
            return
        end

        local newTick = getTickCount()
        if not gLastTick then
            gLastTick = newTick - 50
        end
        local interval = newTick - gLastTick
        gLastTick = newTick

        local vPos = vec(getElementPosition(vehicle))
        for i,line in ipairs(gLines) do
            dxDrawLine3D(line[1][1], line[1][2], line[1][3], line[2][1], line[2][2], line[2][3], tocolor(255, 0, 0))

            local distAlongLine = (vPos - line[1]) * line.dir
            if distAlongLine >= 0 and distAlongLine <= line.length then
                local carToLine = line.dir:cross(line.dir:cross(vPos - line[1]))
                local distToLine = carToLine:len()
                if distToLine <= TUBE_RADIUS then
                    local vVel = vec(getElementVelocity(vehicle))
                    vVel = vVel + (carToLine / distToLine) * (distToLine / TUBE_RADIUS)*TOWARD_LINE_FACTOR*interval
                    vVel = vVel + line.dir * ALONG_LINE_FACTOR*interval
                    setElementVelocity(vehicle, unpack(vVel))
                    break
                end
            end
        end
    end
)