How do you guys do fullscreen rain effect?
Do you use plugins? background animation? Guis?
The usual way (as far as I know) is through this plugin: http://www.adventuregamestudio.co.uk/forums/index.php?topic=25665.140
But I've never used it, so I'm sure someone else here can be more helpful.
I use a GUI with an animation attached to it's background. I believe this is the GUI Animation Module (http://www.adventuregamestudio.co.uk/forums/index.php?topic=29113.msg370611#msg370611) I use.
On a per case basis I do some more fanciness, but is totally room dependant. If a room only exists under rain, for example, I just do it directly in the background and use objects to help with water splashes.
I've used the plugin referenced above, and it's worked great for me