Now the designing of 3d sound has become very easy by a new plugin introduced by Facebook called the fb360 spatial workstation. This plugin can be used in Pro Tools HD, Reaper and Nuendo. I have used this plugin in the daw Reaper. I tried to use it in FL Studio 12 but it doesnot seem to work. We may have to wait some more to be able to use the plugin in every daw.
You can download the FB360 Spatial Workstation here: