Help with Defence

[Progesterone]

Dear all,
how do I make the computer units defend an important structure or area ? ie, every time enemy units are near the important structure/area, the AI will send all nearby units to defend it.
Thanks !

 

[FhelZone]

You may try to use a trigger but the default AI would also do... The default melee AI would always defend the town hall type units...
As for the trigger make a trigger like..

Unit is attacked

Life of attacked unit is less than 50% or something

set TempGroup = Units of type not equal to structure //you may add any other conditions
Pick all units in TempGroup
set TempPoint = position of attacked unit
order picked units to move to temp point
call RemoveLocation( udg_TempPoint)
call DestroyGroup( udg_TempGroup )

 

[Aedes]

you can use UNIT IS ATTACKED or UNIT IS IN RANGE event. then order the units around to attack.

 

[Moridin]

If you want them to defend a certain zone, like an area around a certain structure, then you could do two things:

1) If you have the structures pre-placed (meaning you don't have any more built/placed during the game) then you can make regions around those structures and use a trigger like this:

• Defend Region Trigger
  • Events
    • Unit - A unit enters Region Defend <gen>
    • ...add all your regions here
  • Conditions
    • (Triggering unit belongs to enemy of (<Your computer player>)) Equal to True -> Boolean comparison.
  • Actions
    • Unit Group - Pick all units in Defend_Group and do (multiple actions)
      • Loop - Actions
        • Unit - Order unit to Attack-Move to (Position of (Triggering unit))

You have to make sure that the units you want to defend are in Defend_Group, which is a unit group variable.

2) Otherwise, if you DO have more and more of these "important" structures popping up, you can do this one of two things:

a) Detect when an enemy unit comes within a certain range of a structure.
b) Detect when an enemy unit ATTACKS an important structure.

For a) You can use a periodic trigger (The event being a periodic time event, like every 1 second) and then check if any enemy unit is within a certain range of any of the important structures. You can use the Real Condition:

Math - Distance between two points

For b) You simply use the event:

Unit - A unit is attacked

...along with the condition

(Unit-type of (Triggering unit)) Equal to <Your important structure> -> This is a Unit-type condition

If you have many different structure types that are important, simply put an "Or - multiple conditions" and list the different unit-types under it.