How to: Restrict unit type count (in td)

[BlacKcuD]

hi guys

i'm working on a td for a while now and i've encountred a problem i couldn't fix myself yet.

One race is able to build a so called "Altar of Fire", BUT the players should only be able to have ONE of these.

i tried using researches/techs, but blizzard wont let me reduce upgrade levels. it is somehow not possible :-(
there would be a possibility to just cancel+give back resources upon construction of another altar, but this way is quite sucking and not satisfiing. anyone have an idea how to solve this?
maybe with equivalents (don't know much about that).

ty in advance,

BlacKcuD

 

[redscores]

Use a trigger, when a guy builds that building disable that building from the building players repertoire.

The trigger is under players.

 

[BlacKcuD]

thanks for the fast response. while i triggered your idea, i found another trigger in the players section, which does exactly this thing *zomg*
it is called Player - Set max number of units by type
awkward

 

[redscores]

Didnt know that that trigger existed, funny.

 

[chenlimin]

you can reduce reseach level it is some where in trigger.
off topic:redscore, because you use a german we