Concurrent Interactions in Sims4 by Peter Ingebretson
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The document discusses the system for modeling concurrent interactions in The Sims 4. It describes how interactions are the fundamental unit of behavior, and how the game aims to model multitasking by allowing Sims to have multiple active and queued interactions. Constraints are used to determine whether interactions are compatible to run concurrently based on factors like location, posture, and object handling. An interaction queue and priority system manages which interactions are started and stopped based on constraint checks.
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Concurrent Interactions in Sims4 by Peter Ingebretson
- 1. Concurrent Interactions in The Sims 4 Peter Ingebretson Max Rebuschatis Software Engineers @ Maxis / Electronic Arts
- 3. Outline
- 6. ● Interactions ● Constraints ● Interaction Queue Outline
- 7. ● Interactions ● Constraints ● Interaction Queue ● Transitions Outline
- 8. ● Interactions ● Constraints ● Interaction Queue ● Transitions ● Socials Outline
- 9. ● Interactions ● Constraints ● Interaction Queue ● Transitions ● Socials ● Q&A Outline
- 10. Interactions
- 11. ● The world is built using game objects The Sims Architecture
- 12. ● The world is built using game objects ● Game objects provide interactions – Sims are objects too! The Sims Architecture
- 13. ● The world is built using game objects ● Game objects provide interactions – Sims are objects too! ● Sims run interactions – Interactions are fundamental unit of behavior The Sims Architecture
- 14. ● Natural – People do multiple things at the same time Multitasking
- 15. ● Natural – People do multiple things at the same time ● Frequently requested feature Multitasking
- 16. ● Natural – People do multiple things at the same time ● Frequently requested feature ● Systematic approach is valuable – Ad hoc implementation is lots of work, inconsistent results Multitasking
- 17. ● No true concurrent execution – This is a hard problem – Deadlock, race conditions, etc... Concurrency vs Multitasking
- 18. ● No true concurrent execution – This is a hard problem – Deadlock, race conditions, etc... ● Multitasking – Context switching – Cooperative Concurrency vs Multitasking
- 19. Grab Drink Grab Drink SitSit Sip Drink Sip Drink ... Multitasking Turn on TV Turn on TV YawnYawn Channel Surf Channel Surf Sip Drink Sip Drink Discard Drink Discard Drink LaughLaugh Turn off TV Turn off TV Read Book Read Book
- 22. Grab Drink Grab Drink SitSit Sip Drink Sip Drink ... Multitasking Turn on TV Turn on TV YawnYawn Channel Surf Channel Surf Sip Drink Sip Drink Discard Drink Discard Drink LaughLaugh Turn off TV Turn off TV Read Book Read Book
- 23. Turn on TV Turn on TV Grab Drink Grab Drink Discard Drink Discard Drink SitSit ...... Sip Drink Turn off TV Turn off TV Channel Surf Sip Drink Yawn Laugh Read Book Read Book ...... Multitasking
- 24. Turn on TV Turn on TV Grab Drink Grab Drink Discard Drink Discard Drink SitSit ...... Sip Drink Turn off TV Turn off TV Channel Surf Sip Drink Yawn Laugh Read Book Read Book ...... Interactions Watch TV Interaction Sub Actions Begin End
- 25. ● Each Sim has – A set of active interactions – An ordered queue of pending interactions Running Interactions
- 26. ● Each Sim has – A set of active interactions – An ordered queue of pending interactions ● Sub-actions run “inside” active interactions Running Interactions
- 27. ● Compatible with all running interactions Sub Actions
- 28. ● Compatible with all running interactions ● Selected using weighted random Sub Actions
- 29. ● Compatible with all running interactions ● Selected using weighted random ● Can be limited with additional tests Sub Actions
- 30. Constraints
- 31. ● Can I perform an action? Rules
- 32. ● Can I perform an action? ¬Condition → ¬Action Rules
- 33. ● Can I perform an action? ¬Condition → ¬Action ● How do I perform an action? Rules
- 34. ● Can I perform an action? ¬Condition → ¬Action ● How do I perform an action? Action → Condition Rules
- 35. ● Can I perform an action? ¬Condition → ¬Action ● How do I perform an action? Action → Condition ● Avoids duplicated logic Rules
- 37. ● Data-driven rules ● Preconditions on running an interaction Constraints
- 38. ● Data-driven rules ● Preconditions on running an interaction ● Answer the questions – Can I run an interaction? – How do I run an interaction? Constraints
- 39. Position
- 40. Orientation
- 41. Animation Slot
- 42. Posture
- 43. Posture Examples
- 44. Posture Examples
- 50. Line of Sight
- 52. ● Data driven – Animation: Position, posture, carry – XML Tuning: Geometry, orientation, surface – Script: Scoring function, line-of-sight Constraint Authoring
- 53. ● Multitasking combines constraints Constraint Combination
- 54. ● Multitasking combines constraints ● Supported operations – Intersection – Union Constraint Combination
- 57. Q: Are interactions compatible? Interaction Compatibility
- 58. Q: Are interactions compatible? A: Yes, if the intersection of their constraints is non-empty Interaction Compatibility
- 62. ● Each Sim has – A set of active interactions – An ordered queue of pending interactions Interaction Queue
- 63. ● Each Sim has – A set of active interactions – An ordered queue of pending interactions ● Interactions have priority – High (User directed) – Low (Autonomous) – Idle (Finished but still running) Interaction Queue
- 64. Queue Processing Can Next Interaction Run? Can Next Interaction Run?
- 65. Queue Processing Can Next Interaction Run? Can Next Interaction Run? Wait in QueueWait in Queue No
- 66. Queue Processing Can Next Interaction Run? Can Next Interaction Run? Wait in QueueWait in Queue No Yes Cancel Incompatible Active Interactions Cancel Incompatible Active Interactions
- 67. Queue Processing Can Next Interaction Run? Can Next Interaction Run? Wait in QueueWait in Queue No Yes Cancel Incompatible Active Interactions Cancel Incompatible Active Interactions Start RunningStart Running
- 68. Turn on TV Turn on TV Grab Drink Grab Drink Discard Drink Discard Drink SitSit ...... Sip Drink Turn off TV Turn off TV Channel Surf Sip Drink Yawn Laugh Read Book Read Book ...... Interaction Processing Example
- 69. Don't Care Next interaction Active Interactions Queued Interactions Watch TV Watch TVDrinkDrink SitSit Read Book Read Book Interaction Processing Example Where How Hands AnythingAnywhere
- 70. Don't Care Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where How Hands AnythingAnywhere
- 71. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care Holding Drink How Hands AnythingAnywhere Anywhere Anything
- 72. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care How Hands AnythingAnywhere Anywhere
- 73. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care How Hands AnythingAnywhere Anywhere
- 74. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care How Hands AnythingAnywhere Anywhere Sit or Stand
- 75. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care How Hands AnythingAnywhere Anywhere Sit or Stand
- 76. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care Hold Drink How Hands AnythingAnywhere Anywhere Sit or Stand
- 77. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Don't Care Hold Drink How Hands AnythingAnywhere Anywhere Sit or Stand
- 78. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere
- 79. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere
- 80. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere
- 81. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere On Seat
- 82. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere On Seat
- 83. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere On Seat Sit
- 84. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands Sit or Stand Anywhere On Seat Sit
- 85. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands Sit or Stand Anywhere On Seat Sit
- 86. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands Sit or Stand Anywhere On Seat Sit
- 87. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrink SitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands Sit or Stand Anywhere On Seat Sit
- 88. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat
- 89. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat
- 90. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat
- 91. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat In view, Facing
- 92. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat In view, Facing
- 93. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat In view, Facing Sit or Stand
- 94. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat In view, Facing Sit or Stand
- 95. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands SitOn Seat In view, Facing Sit or Stand
- 96. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands SitOn Seat In view, Facing Sit or Stand
- 97. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Don't Care How Hands SitOn Seat In view, Facing Sit or Stand
- 98. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat
- 99. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat
- 100. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat Anywhere
- 101. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat Anywhere
- 102. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 103. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 104. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 105. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 106. Next interaction Active Interactions Queued Interactions Watch TV Watch TV DrinkDrinkSitSit Read Book Read Book Interaction Processing Example Where Hold Drink Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 107. Next interaction Active Interactions Queued Interactions Watch TV Watch TV SitSit Read Book Read Book Interaction Processing Example Where Don't Care Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 108. Next interaction Active Interactions Queued Interactions Watch TV Watch TV SitSit Read Book Read Book Interaction Processing Example Where Don't Care Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 109. Next interaction Active Interactions Queued Interactions Watch TV Watch TV SitSit Read Book Read Book Interaction Processing Example Where Don't Care Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 110. Next interaction Active Interactions Queued Interactions SitSit Read Book Read Book Interaction Processing Example Where Don't Care Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 111. Next interaction Active Interactions Queued Interactions SitSit Read Book Read Book Interaction Processing Example Where Don't Care Both Hands How Hands SitOn Seat Anywhere Sit or Stand, Not TV
- 112. Next interaction Active Interactions Queued Interactions SitSitRead Book Read Book Interaction Processing Example Where Both Hands How Hands Sit, Not TV On Seat
- 113. Next interaction Active Interactions Queued Interactions SitSitRead Book Read Book Interaction Processing Example Where Both Hands How Hands Sit, Not TV On Seat
- 116. Transitions
- 117. ● Constraints define preconditions for performing an interaction Generating Behavior
- 118. ● Constraints define preconditions for performing an interaction ● Can be used generatively Generating Behavior
- 119. ● Constraints define preconditions for performing an interaction ● Can be used generatively ● Requires ability to find transition to constraint Generating Behavior
- 120. ● The constraints on each object are stored in an abstract graph Transition Graph
- 121. ● The constraints on each object are stored in an abstract graph ● Edges are state changes Transition Graph
- 122. ● The constraints on each object are stored in an abstract graph ● Edges are state changes ● Search graph to generate a transition sequence Transition Graph
- 124. Using the Graph Stand near table, Carry Drink Stand near table, Carry Drink
- 125. Using the Graph Stand near table, Carry Drink Stand near table, Carry Drink Stand near table, Drink on table Stand near table, Drink on table
- 126. Using the Graph Stand near table, Carry Drink Stand near table, Carry Drink Sit at table, Drink on table Sit at table, Drink on table Stand near table, Drink on table Stand near table, Drink on table
- 127. ● Multiple nodes can match requirements Graph Searching
- 128. ● Multiple nodes can match requirements ● Edges are weighted by cost – Routes weighted by approximate distance Graph Searching
- 129. ● Multiple nodes can match requirements ● Edges are weighted by cost – Routes weighted by approximate distance ● Search determines optimal path Graph Searching
- 132. ● Bidirectional search Search Optimizations
- 133. ● Bidirectional search ● Simplifications – Carry – Slot Search Optimizations
- 134. ● Bidirectional search ● Simplifications – Carry – Slot ● Node query indexing Search Optimizations
- 135. Socials
- 136. Socials
- 137. Socials
- 140. Convex LOS
- 141. Social Clustering
- 142. Social Clustering
- 143. ● Building Features Challenges – Complexity
- 144. ● Building Features – Less tolerance for ad-hoc implementation Challenges – Complexity
- 145. ● Building Features – Less tolerance for ad-hoc implementation – Must express features using constraints Challenges – Complexity
- 146. ● Building Features – Less tolerance for ad-hoc implementation – Must express features using constraints ● Authoring content Challenges – Complexity
- 147. ● Building Features – Less tolerance for ad-hoc implementation – Must express features using constraints ● Authoring content ● Complexity of data Challenges – Complexity
- 148. ● Excessive multitasking Challenges – Player Expectations
- 149. ● Excessive multitasking ● Communicating compatibility Challenges – Player Expectations
- 150. ● Excessive multitasking ● Communicating compatibility ● Uncanny valley Challenges – Player Expectations
- 151. ● The best rules can be used both to restrict and to drive behavior Takeaway
- 152. ● The best rules can be used both to restrict and to drive behavior ● Composable rules are necessary to support multitasking Takeaway
- 153. ● The spatial relationship between objects is more important Impact
- 154. ● The spatial relationship between objects is more important ● More diverse behavior with the same amount of content Impact
- 155. Peter Ingebretson (pingebretson@ea.com) Max Rebuschatis (maxr@ea.com) Questions?
- 156. Bonus Content!
- 157. Holstering
- 158. Holstering