Vissible map?

[X-maul]

How to make a part of the map vissible to a player?
(Like having a unit nearby which is able to see the area, just without the unit)

 

[Rainther]

I accomplised this through the use of a trigger and a region.

I set out a region. Everywhere this region is will become visible.

I recall a trigger lets you either make the region visible when a unit enter that, or another region. This was used sometimes in the Single Player. Like that map where you "drill" into a Protoss Door. Because you have the base, you get to see regions outside of the base.
I do believe an other trigger allows you to make it visisble all the time.

On the top of my head I'd suggest you to search in Actions for "visib" and see if you find the Action.

 

[X-maul]

yes.. well, I managed to locate it, it's named a revealer.

        Visibility - Create a visibility revealer for player [COLOR="blue"][U]#[/U][/COLOR] within [COLOR="blue"][U]REGION[/U][/COLOR]