Miasma Community

I will begin this tutorial assuming you at least have 2 subtracted brushes in your map, a light, textures for inside/outside areas, and that you want to add Rain to your map. Note: you can click the images to see them full-size.


Just dumping this here, so that the thread gets frontpage on Google.
General protection fault!

History: AActor::SetZone <- Finishing <- ULevelFactory::FactoryCreateText
<- UUnrealEdEngine::edactPasteSelected <- UUnrealEdEngine::Exec_Edit
<- UUnrealEdEngine::Exec <- WEditorFrame::OnCommand <- WWindow::WndProc
<- WWindow::StaticProc <- MessagePump <- MainLoop


First thing you will want to do is go to Actors > xWeatherEffect, and place one in your map.

[linkimg]http://i.imgur.com/BpIJi.png?1[/linkimg]





Next, open the Texture Browser and open EmitterTextures.utx.

[linkimg]http://i.imgur.com/GIo1W.png?1[/linkimg]





Under the MultiFrame group, select the FinalBlend RainFB texture.

[linkimg]http://i.imgur.com/cA21d.png?1[/linkimg]





Next, open the properties for the xWeatherEffect, go to Display > Skins > click "Add," then click "Use." It should now show a layer with the RainFB texture selected, and you should now see beautiful floating blobs. You've pretty well already won the battle
(Note: you can use whatever textures you want, and whatever settings you want from this step onwards)

[linkimg]http://i.imgur.com/nMZaQ.png?1[/linkimg]





Now, still in the Properties window, go to xWeatherEffect and change these settings, depending on what weather effect you're using (WT_Rain, WT_Snow, WT_Dust). You may copy my settings (as I copied others ) for a general Rain effect.

[linkimg]http://i.imgur.com/jWEvL.png?1[/linkimg]





Finally, to exclude the xWeatherEffect from certain areas: Make a normal Volume surrounding the space in which you want no weather (generally somewhere with a roof). Then under the Volume's properties, go to Event > Event, Tag and Volume > AssociatedActorTag and set them to NoRain. Then, open the xWeatherEffect properties one last time, and go to Event > set both Event and Tag to NoRain. Make sure the Event, Tag, and AssociatedActorTag of the volume are the same thing, otherwise this won't work. Note: I enhanced the area outside of the volume (where the sky is). The rain is still visible outside the volume, but not on the inside.

[linkimg]http://i.imgur.com/nDkVo.png?1[/linkimg]

I'm impressed,  great rain tutorial!