gmod but with a realistic view angle

cl_realistic_view_angles.lua

-- reference and calcs : https://i.imgur.com/G81PMSd.jpg
-- drop me in autorun/client/
local intensity = 1

local function cmtounit(cm)
	return math.Remap(cm, 0, 173.736, 0, 96)
end

local cmDistanceUpPivot = 21.384 * intensity -- (cm)
local cmDistanceForwardPivot = 14.87 * intensity -- (cm)
local sourceUnitsDistanceUpPivot = cmtounit(cmDistanceUpPivot) -- (source units)
local sourceUnitsDistanceForwardPivot = cmtounit(cmDistanceForwardPivot) -- (source units)
local fixVector = Vector(0, 0, sourceUnitsDistanceUpPivot)


local UCalcView = function(ply, pos, angles, fov)
	local view = {}
	view.origin = pos + (angles:Forward() * sourceUnitsDistanceForwardPivot) + (angles:Up() * sourceUnitsDistanceUpPivot) - fixVector
	view.angles = angles
	view.fov = fov
	view.drawviewer = false

	return view
end

hook.Add("CalcView", "RealisticViewSystem", UCalcView)
hook.Add("CalcVehicleView", "RealisticViewSystem", UCalcView)

hook.Add("CalcViewModelView", "RealisticViewSystem", function(wep, vm, oldPos, oldAng, pos, ang)
	pos = pos + (ang:Forward() * sourceUnitsDistanceForwardPivot) + (ang:Up() * sourceUnitsDistanceUpPivot) - fixVector
	return pos, ang
end)