Module wallmounted_to_facedir.lua
Convert wallmounted to facedir and back param2
Usage
local to_facedir, to_wallmounted = luanti_utils('wallmounted_to_facedir.lua')
to_facedir(default_sign.param2) -- Calculate the facedir equivalent for wallmounted sign.
to_wallmounted(vine_param2) -- Calculate wallmounted equivalent of facedir vine.