local pi = math.deg(math.pi)
local function CalculateRealFov(fov,aspectRatio)
    return (math.atan(math.tan((fov *pi) /360) *(aspectRatio /(4 /3))) *360) /pi
end
local fov = 70
fov = CalculateRealFov(fov,ScrW() /ScrH())