Bad AIs in SS2 chase and hunt the
player until one of them kill the other.
Good and neutral AIs ignore the player, so it is quite difficult
to interact with them.
Some of us want to have team members in single player game FM,
or have some NPC to work for us.
To make an AI follow the player, AIFollowObj link is one of
the solutions, AIWatchObj link is another.
You can simply add AIFollowObj link from the AI to the player,
adjust the distances and angles in data menu of the link.
Use distances of more than 4 to avoid the AI stepping on player's
Remember to compute pathfinding database so that the AI knows
where to find the player.
Then the AI fight for you and return to you after the battle.
However, this is only an experiment of the link. You have no
player object before game mode or real game, the link should
If you link the AI to The Player (-384), it will go to the starting
location or level start marker. Is the link useless? No, you
can use a signal response to add the link from the AI to the
player. Add AI->Response->Signal response to the AI, name the
signal SwitchOn (don't try other name, otherwire you have to
use AI signal trap to activate the signal response).
On Response Step 1, select add link, enter AIFollowObj on Argument
1, player on Argument 2, AI's object number on Argument 3. Then
add an once tripwire, add switchlink from the tripwire to the
AI. When the player cross the tripwire, the AI will follow you
everywhere. But you can't adjust the distances (I can't, may
be someone can). To make the AI stay away from you as a bodyguard,
you can still use AIFollowObj link, this time link the AI to
compass HUD (-3634). This object exists before the game and
the AI chases compass HUD attached to the player in game. One
problem of this is the AI looks for you once you enter game,
they probably walk through doors to find you.
Frozen or docile metaproperties can't stop them. So you may
need to teleport the AI in the map if you want the player meets
it later in game.
Another method is to use AIWatchObj link, add it from the AI
to itself. Then in data menu, select Player intrusion on Watch
kind, enter Trigger radius 40 and height 30, select Don't kill
on Exit: Link kill option, then on Response Step 1, select Goto
object, enter player on Argument 1. The AI will go to the player
once it sees him. However, I can't adjust the distance of the
AI from the player. (This method is actually suggested by ndru.)
A Demo Mission of the above exists and can be found Here
Leading an AI to open a door
We may want an AI to open a door
for us, and the door can
only be opened by the AI, so we use AIWatchObj link.
Add the link from the AI to the door or an invisible button
to the door or any object close to the door.
In data menu, select Self entry on Watch kind, enter Trigger
radius 8 and height 8 (depending how close you want to), select
After completion on Exit: Link kill option, then on Response
Step 1, select frob object, enter button's object number on
Remember not to shut the door or let the AI die, otherwise I
can't help you.
However, the results of my expts aren't very satisfactory and
AI following the player with AIFollowobj link freezes after
opening the door.
To defrost the AI, remove the AIFollowobj link before or after
frobing the button.
Select Remove link on Step 1 or 2, enter AIFollowObj on Argument
1, enter player or compass HUD as you have chosen before on
Argument 2, enter object number of the AI on Argument 3.
Also AI following the player with AIWatchObj link seems to have
some difficulties to find the button or door.
is a demo FM. (119Kb)