Particle System Surface/Vertex Location bugged?

Hi everyone,

I’m , this is my first experience with UE. I’ve read a lot about particle systems, since I need to use them and I saw that are very powerful here in UE.
My point is that I need to spawn them uniformly along all the surfaces of an actor. I’ve noticed that with the most simple actor (a skeletal cube) it spawn only in 2 fixed positions per surface instead of spawn them uniformly 29814-schermata+2015-02-07+alle+09.12.45.png.
Any idea about it? Did I miss some steps or it is not doing what is suppose to do? :confused:

Thanks

as I understood it spawn only in the exact position of the normal. Did anyone faced it? does anyone know a workaround?
Is it possible to create a C++ script to spawn uniformly along every surface?