simulation robin burke gam 224. outline admin quiz play paper midterm grades core mechanic...
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Simulation
Robin Burke
GAM 224
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Outline
AdminQuizPlay paperMidterm grades
Core Mechanic Simulation
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Admin
QuizQuiz scores
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Quiz scores
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Play paper
Due today Up to 3 days late
½ grade point per day No rewrites
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Rewrites
Due 11/9 Turn in
original graded papernew hardcopydigital copy to turnitin.com
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Midterm grades
AAAAA--- BBBBBBB++++--- CCCCCC++++- DD FF Major caveats
Final project not included (20%) Participation grades not included (20%) 2 more analysis papers (20%) plus rewrite 3 More reaction papers
Don't panic!
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Core Mechanic
Major source of lost point on Quiz #2 Many problems with project milestone
#3
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Review
Core mechanic analyzes low-level activity of the playermechanic ≠ physicsmechanic ≠ missionsmechanic ≠ player knowledge
I can have games with similar physics and missions but different mechanicsPac-Man vs Katamari Damacy
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Example
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Simulation
Games simulate real-world activitiessports gamesracing games
Central ideamapping between the game and the
real-world activity
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Simulation II
Games also simulate fantasy and fictional activitiesany RPGmost FPS
Central ideamapping between the game and...
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Mapping
The mapping will be incomplete the game may leave out inconvenient or
boring parts the game may include improbable situations
for gameplay reasons The mapping will be inexact
the game may exaggerate the physics for effect or gameplay
the game may (will) abstract from physical reality for practical reasons
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Basic fact
All physics is simplificationcomplex multi-body physical
simulations are too slowreality is chaoticlimits to what can be rendered
graphically
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Example: Halo
What happens when a grenade explodes?do we simulate the ignition and rapid
oxidation of explosives, pressure waves, metal shear and shrapnel trajectories?
do we simulate concussion injuries, soft tissue damage, and bone trauma?
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Game physics
Physics = the evolution of the game statewe want the player to feel as though
there is a real world in the gamethe game state must be complexits evolution must seem naturalthe player's control over it should
seem natural
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Natural?
Games are profoundly unnatural Aliens? Psychic powers? Controlling a
civilization over centuries? As in fiction
"willing suspension of disbelief" natural within the game world context
Game physics may have nothing to do with Newton's
physics
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Scripting
When there is a fixed stereotyped response to an action in the gamewe say it is "scripted"
As opposed to "simulated"
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Example
Designer decides what should happen when a grenade explodesx amount of damage to all units within
certain radiusx/2 damage within a larger radiusleaves a certain "stencil" on the floor
or wall Simplifying the actual physics
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Example
Locked door in ZeldaIf player ties to go through locked door
with key in inventory, the door opens and key is used up
SimplificationsDoors are logical, not physical barriers
• Cannot be battered down, blown up, removed from hinges
• Locks cannot be picked
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Advantages of scripting
Much, much fasterto apply a simple rule than to run a
physical simulation Easy to write, understand and modify
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Disadvantages of scripting
Limits player creativityPlayers will try things that "should"
work• based on extensive physical intuition
Will be disappointed if they don't Game will need many scripts
predicting their interactions can be difficult
complex debugging problem
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Simulation
Will still be a simplification Represent the quantities of interest
represent the forces that act on themcreate physical laws for the game
worldevolve the game state according to
these laws
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Benefits of simulation
More player optionsDesigner doesn't have to anticipate
every way to do something Physical laws reusable
Do not have script every objectCan build (or buy) generic physics
engine
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Disadvantages of simulation
Speedextensive simulation may make the
game too slow Memory
game state may become much larger Testing
difficult to test all possibilities
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Design decision
How much to simulate? Where player creativity is important Where realism is important Where a simple enough model can be built
What level of detail is required? depends on the constraints of the game always a computational cost
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Example
Script when player enters room, guards converge and attack
Simulation #1 when player takes a step, sound is heard over certain radius if guard is within radius and in room, guard will converge and attack
Simulation #2 when player takes a step, volume of sound is calculated based on
level of stealth, floor material, etc. sound is propagated through room and attenuated based on room
contents guards receive sound signal and if loud enough to reach attention,
they will move in the apparent direction of sound Simulation #3
same as #2, but in 3 dimensions, through floors, etc. Simulation #4
same as #3, but guards have multiple alert states. A single low-intensity noise will increase their alert state.
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The role of simulation
"Immersive fallacy" the best game is one in which the player
feels that they are totally immersed in a simulated world
emphasizes only a certain aspect of the game experience
Counter-examples More detail is not necessarily better
• Katamari Damacy Need for ironic distance
• GTA
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Monday
Culture unit Play paper due