I don’t know if this was posted, but a Japanese developer made this:
The link is in Japanese, but I assume he explains how to do it:
http://ogimafu.blogspot.com/2015/03/ue4_22.html
http://ogimafu.blogspot.com/2015/03/ue4_30.html
http://ogimafu.blogspot.com/2015/04/ue4.html