AI: Difference between revisions

'''Hearing''' is crucial in Oni. The majority of AI character interaction is done via the sound system. Oni recognizes these types of sound (colors in parentheses are used for sound visualization when '''[[ai2_showsounds]]''' is set to 1):

==Pursuit of enemy alias "I will find you..."==

Everything that was needed was explained in section above so let's take a look at '''pursuit''' behavior. Pursuit behavior in Oni emulates the situation when a man knows "somebody is here", but does not see anybody.

Oni deals with this problem by using pursuit behaviors. In Oni there are following types of '''pursuit''' behavior:

:*None - simply nothing

:*Forget - AI goes into forgotten awareness with this enemy

:*GoTo - AI moves to the source of distrubance and executes timer-based 600 frames Look behavior (600 frames = 10 seconds)

:*Wait - AI simpy stands and waits

:*Look - AI rotates on spot and looks all around

:*Move - unimplemented, probably was meant to be similar to Look, but with character randomly moving around

:*Glance - AI does not rotate whole body, only rotates its head

In Oni, a character which is spawned in the level is a character profile from [[CHAR]] file. This CHAR profile contains links to:

:*[[ONCC]] file - character class, eg. Konoko or Comguy_1

:*[[CMBT]] file - combat profile for this character

:*[[MELE]] file - melee profile  for this character

:*[[PATR]] file - OPTIONAL, patrol path

:*[[NEUT]] file - OPTIONAL, neutral behavior (for example civilians giving player some powerup)

 

Modding hints: '''Pursuit mess and weird glitches'''

:[http://www.youtube.com/watch?v=OMFK5iKcZ5Q Watch this YouTube video.]

:Pursuit mode is quite buggy, so when altering this behavior, there are several important things modder has to have on mind.

:*Pursuit distance parameter in [[CMBT]] is important in deciding whether the character should be more a pursuer or more a guard.

:*Within the pursuit distance, peripheral vision pursuit runs its own league. When AI character sees enemy with its peripheral vision, this AI always goes into weak awareness mode and either just glaces at direction of this enemy (alert level was below investigate level) or moves to the spot and performs weak investigation pursuit behavior (alert level was on investigate level on higher).

:*Remember there are TWO sets of pursuit behavior:

:**strong and weak pursuit for lull/low alert levels. In xml these are called <StrongUnseen> and <WeakUnseen>, however those names simply reflect how many changes were made to this part fo the game.

:**strong and weak pursuit for medium/high/combat levels, in xml called <StrongSeen> and <WeakSeen>.

:*From all available pursuit behaviors GoTo, Look, Glance, Forget and Wait can be effectively used in CHAR pursuit behavior parameters. Hunt and Move are not finished code-wise.

:*'''Remember that whole pursuit behavior is glitched and parameters from CHAR are more often ignored than actually used.''' This glitch is somehow connected with sight. When sight of AI characters is turned off via '''ai2_blind=1''', whole pursuit mechanics work as they should. However, the moment AI character is allowed to see, then when pursuit should be performed it gets:

:**bugged and results in pursuit values from [[CHAR]] being ignored if pursuit mode was called while the caracter was idle or moving in a patrol path. Our AI character performs basic GoTo + timer-based Look for the whole time of pursuit, for both strong and weak awareness. Looks so-so but definitely is a glitch.

:**bugged and results in one GoTo + timer based Look being called, but timer for Look does not decrement, so AI simply stands and stares. This happens when pursuit mode is called while AI stand at job location in patrol path. And well... it looks really bad.

:**in roughly 10% the pursuit performs correctly. It is quite random, but looks like AI has to be somehow disturbed while going for the source of previous distrubance. And then Oni writes into console "pursuit mode Hunt not yet implemented" ^_^.

:*The best way how to deal with pursuit sight issue is to either ignore it (so char get often glitched) or use BSL script to create a small self-looping function where ai2_blind is set to 1 for at least one second (60 frames), then set to 0 again. It can cause funny moments of AI completely ignoring enemy right in front of it, but it silently fixes these pursuit problems.