Weather Fx in nonrectangular areas

How do you make these effects in nonrectangular areas? Is it really necessary to create dozens of regions? I have pretty complicated map and I need to put different fx in several different nonrectangular areas

Yes.

There are a few of tricks that you could use to make this easier though, if all the rects that needed a weather effect had the same prefix and a unique id you could use a program to generate Jass code that moves them into a single array you could then use a single FOR to add the weather effects.

In fact, you don't even need an specialized program, even excel can do it.

If you want some more info on behaviors of weather effects, read my pending tutorial found here. It explains a few unknown issues at the end.

Vex: Thanks. Ended up with 24 regions in one area :)

Ammorth: Good tut, thanks