Lens effects?

[afx]

I'm trying to create a effect of water being dripped down the player's screen from trickling rain. I found this:
http://udn.epicgames.com/Three/Camer...Lens%20Effects

"These lens effects can be used to create things like rain dripping down the camera lens..." That's exactly what I want. But how do I implement a "lens effect" I've searched through the camera properties, post process properties and all of kismet but I cannot find anything regarding lens effect. Is it simply just a particle system attached to the player via "attach to actor" in kismet?

Thanks.

[Last Touch Studios]

What it looks like is scripting is needed but don't quote me on that.

[joebrammer]

I would do it though UI (User Interface). I'd create an alpha material and animate rain drops to slide down the screen, exactly like a rain plane but on UI instead.

[redbox]

something like this?

It's a simple particle system, attached to camera. in your case - it must be set as Camera Lens Effect.