Hey guys,
Basically for my university assignment we were challenged to create a level based on a piece of music. I have almost completed my level but I have been trying to add rain to the outside sections of it. I have tried numerous tutorials and I was wondering if anyone has any idea how I could achieve a rain effect. I'm using the 2012-03 editor.

This is the tutorial I made the most process in by using planes (http://www.youtube.com/watch?v=3e3UEGl7YDA).Only problem is that when I apply the material to the plane and in the editor window it looks like a success but when I build and play my level they appear as solid black planes that you can walk through....HELP!

Any suggestions would be much appreciated
Thanks