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Transcript of 1 Artificial Intelligence in Games Class 6 Steve Rabin [email protected] .
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Pathfinding Project Any issues? Due next week
Port A* to your own game Requirement (100%)
Service path requests one at a time (FIFO) Have agents show their final path with
lines/arrows Bonus (+100%)
Show the open and closed list in different colors Have a toggle button to watch search step-by-
step
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Reading Assignmentfor Next Week Chapter 6
6.1 Waypoint Tactics 6.2 Tactical Analyses 6.3 Tactical Pathfinding 6.4 Coordinated Action
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Game Agents
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Game Agents May act as an
Opponent Ally Neutral character
Continually loops through the Sense-Think-Act cycle Optional learning or remembering
step
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Sense-Think-Act Cycle:Sensing
Agent can have access to perfect information of the game world May be expensive/difficult to tease out
useful info Game World Information
Complete terrain layout Location and state of every game object Location and state of player
But isn’t this cheating???
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Sensing:Enforcing Limitations Human limitations? Limitations such as
Not knowing about unexplored areas Not seeing through walls Not knowing location or state of
player Can only know about things seen,
heard, or told about Must create a sensing model
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Sensing: Human Vision Model for Agents How should we model agent
vision?
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Sensing: Human Vision Model for Agents Get a list of all objects or agents; for each:
1. Is it within the viewing distance of the agent? How far can the agent see? What does the code look like?
2. Is it within the viewing angle of the agent? What is the agent’s viewing angle? What does the code look like?
3. Is it unobscured by the environment? Most expensive test, so it is purposely last What does the code look like?
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Sensing: Human Vision Model for Agents
Enemy
Player
View Distance
Wall
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Sensing: Human Vision Model for Agents Is it within the viewing angle of the
agent?
90°
45°
60°
30°Viewing Angle
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Sensing: Human Vision Model for Agents Is it within the viewing angle of the
agent?
0.0
0.707
0.5
0.866
90°
45°
60°
30°Dot ProductViewing Angle
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Sensing: Human Vision Model for Agents Is it unobscured by the
environment? How would you do this better? How would you do this perfect?
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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Sensing: Human Vision Model for Agents
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DigiPen Vision Demo
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Sensing: Human Vision Model for Agents Let's get more real
Hard to see camouflaged objects Hard to see non-moving characters Hard to identify peripheral objects Hard to identify far away objects Vision should be based on head
direction, not body direction
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Sensing:Vision Model Isn’t vision more than just detecting
the existence of objects?
What about recognizing interesting terrain features? What would be interesting to an agent?
Demo!
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Sensing:Human Hearing Model Humans can hear sounds
Can recognize sounds Knows what emits each sound
Can sense volume Indicates distance of sound
Can sense pitch Sounds muffled through walls have more
bass Can sense location
Where sound is coming from
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Sensing:Modeling Hearing How do you model hearing
efficiently? Do you model how sounds reflect off
every surface? How should an agent know about
sounds?
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Sensing:Modeling Hearing Efficiently Event-based approach
When sound is emitted, it alerts interested agents
Use distance and zones to determine how far sound can travel
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Sensing:Modeling Hearing Efficiently
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Sensing:Communication Agents might talk amongst
themselves! Guards might alert other guards Agents witness player location and
spread the word Model sensed knowledge through
communication Event-driven when agents within
vicinity of each other
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Sensing: Player Reputation (Gunslinger) Chapter 8.6 – A Dynamic
Reputation System Based on Event Knowledge
Bandit
M e m o ry E le m e n t
1
2
3
5
R e p u t a t i o n Tab l e
G r o u p R e p u t a t i o n
Farm e rs N e utral
Lawm e n H ate
B andits L ike
P laye r H ate
To wnspe o ple N e utral
P e r - N P C M e m o r y
M as t e r E ve n t L i s t
1 . B andit K ille d Farm e r
2 . P laye r Aide d Lawm an
3 . P laye r K ille d B andit
4 . P laye r Trade dW ith To wnspe rso n
5 . [...]
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Sensing: Player Reputation –Reputation Event
Subject Group Player
Verb DidViolenceTo
Object Group Bandit
Object Individual Joe
Magnitude 75 (Killed)
Where 50, 20, 138 (In front of Saloon)
When High noon
Template KilledBanditTemplate
Reference Count Known by 11 NPCs
Reputation Effects Bandits hate player more.Lawmen like player more.Farmers like player more.
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Sensing: Player Reputation in Fable Five opinion values are in range [-
1,1] Morality [Evil, Good] Renown [Contemptible, Renowned] Scariness [Ridiculous, Scary] Agreeableness [Offensive, Agreeable] Attractiveness [Ugly, Attractive]
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Sensing: Player Reputation in Fable Player has hero stats of 5 opinion
values Player can check at any time Player has sense of self Unobserved acts have an affect on villagers
Each NPC has a relative opinion Only directly witnessed acts or overheard
acts Absolute opinion = hero stats + relative
opinion
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Sensing: Player Reputation in Fable Event-driven opinion deeds are
posted (like Greg Alt’s article) DEED_CRIME_WEAPON_OUT DEED_CRIME_VANDALISM DEED_EXPRESSION_HEROIC_STANCE DEED_EXPRESSION_FLIRT DEED_RECEIVE_GIFT_ROMANTIC DEED_RECEIVE_GIFT_FRIENDLY ...
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Sensing:Reaction Times Agents shouldn’t see,
hear, communicate instantaneously
Players notice! Build in artificial reaction
times Vision: ¼ to ½ second Hearing: ¼ to ½ second Communication: > 2
seconds
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Sense-Think-Act Cycle:Thinking Sensed information gathered Must process sensed information Two primary methods
Process using pre-coded expert knowledge
Use search to find an optimal solution
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Thinking:Expert Knowledge
Many different systems Finite-state machines Production systems Decision trees Logical inference
Encoding expert knowledge is appealing because it’s relatively easy Can ask just the right questions As simple as if-then statements
Problems with expert knowledge Not very scalable
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Thinking:Search Employs search algorithm to find
an optimal or near-optimal solution A* pathfinding common use of
search
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Thinking:Machine Learning If imparting expert knowledge and
search are both not reasonable/possible, then machine learning might work
Examples: Reinforcement learning Neural networks Decision tree learning
Not often used by game developers Why?
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Thinking:Flip-Flopping Decisions Must prevent flip-flopping of
decisions Reaction times might help keep it
from happening every frame Must make a decision and stick with
it Until situation changes enough Until enough time has passed Baseball example
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Sense-Think-Act Cycle:Acting Sensing and thinking steps invisible to
player Acting is how player witnesses
intelligence Numerous agent actions, for example:
Change locations Pick up object Play animation Play sound effect Converse with player Fire weapon
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Acting:Showing Intelligence Adeptness and subtlety of actions
impact perceived level of intelligence Enormous burden on asset generation Agent can only express intelligence in
terms of vocabulary of actions Current games have huge sets of
animations/assets Must use scalable solutions to make
selections
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Extra Step in Cycle:Learning and Remembering Optional 4th step Not necessary in many games
Agents don’t live long enough Game design might not desire it
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Learning Remembering outcomes and
generalizing to future situations Simplest approach: gather
statistics If 80% of time player attacks from left Then expect this likely event
Adapts to player behavior
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Remembering Remember hard facts
Observed states, objects, or players For example
Where was the player last seen? What weapon did the player have? Where did I last see a health pack?
Memories should fade Helps keep memory requirements lower Simulates poor, imprecise, selective human
memory
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Remembering within the World All memory doesn’t need to be stored
in the agent – can be stored in the world
For example: Agents get slaughtered in a certain area Area might begin to “smell of death” Agent’s path planning will avoid the area Simulates group memory
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Game AgentCooperation
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Game Agent Cooperation How might agents cooperate?
With one other NPC? In a mob "kung-fu" style? In a squad? On a baseball team? As part of a 5000 person invasion?
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Game Agent Cooperation Three interesting methods
1. Individuals communicate and arbitrate between themselves
2. Invisible manager coordinates3. Blackboard architecture
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Individual Communication Scalability problem Requires handshaking and
arbitration Can you imagine doing this with
SendMsg and OnMsg? What is necessary for optimal
cooperation?
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Manager Cooperation Agent assignment
Get list of agents Assign each agent a task
Task assignment Compose list of tasks Prioritize Assign tasks to best candidate
Playbook cooperation Preplanned assignments based on situation
Exhaustive analysis Some permutation of tasks/agents is optimal
Score each permutation and pick best
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Blackboard Architecture Complex problem is posted on
a shared communication space Agents propose solutions Solutions scored and selected Continues until problem is solved
Alternatively, use concept to facilitate communication and cooperation
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Blackboard Architecture ExampleUnits compete for missions on blackboard
Skill Required Priority Data
Mission 1:
Capacity
Skill Required Priority Data
Mission 2:
Capacity
Skill Required Priority Data
Mission n:
Capacity
Skill Proficiency
Skill Proficiency
Skill Proficiency
Unit 1
Skill Proficiency
Skill Proficiency
Skill Proficiency
Unit 2
Skill Proficiency
Skill Proficiency
Skill Proficiency
Unit n
Arbitration Mechanism
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“Blackboard” for Pathfinding
1
1 1
1
1A
B
E
1
1 1
1A
B
E
50
Reserved
(A) (B)
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Extra
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Fun Exercise:
You'll need a piece of paper...
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Geek Logik(The Book)
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Geek Logik: Should you go to the doctor? (p88)
CP
D
ENES
703100
23
3
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Geek Logik: Do you have a snowball's chance in hell with her? (p12)
R
K
EESS
CC
A
AWG hyhy
h
y
100
3
2
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Geek Logik: Is your personal grooming adequate? (p98)
RSFP
EA
G a
1125
25214225
212
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Geek Logik: Should you join a gym? (p100)
10
1DCFS
TM
FS
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Geek Logik: Vote for One (In-Class Exercise)
1. Should you go to the doctor?
2. Do you have a snowball's chance in hell with her?
3. Is your personal grooming adequate?
4. Should you join a gym?
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Questions?