Get PoseSearchInteractionSubsystem

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Get Pose Search Interaction Subsystem (World Subsystem)

Execution model and threading details:

• by calling UPoseSearchInteractionLibrary::MotionMatchInteraction_Pure(TArray Availabilities, UObject* AnimInstance), characters publish their availabilities to partecipate in interactions to the UPoseSearchInteractionSubsystem
• UPoseSearchInteractionSubsystem::Tick processes those FPoseSearchInteractionAvailability(s) and creates/updates UE::PoseSearch::FInteractionIsland. For each FInteractionIsland it injects a tick prerequisite via FInteractionIsland::InjectToActor (that calls AddPrerequisite) to all the Actors in the same island. NoTe: the next frame the execution will be: for each island[k] { for each Actor[k][i] { Tick all the TickActorComponents prerequisites, such as CharacterMovementComponent[k][i] (or Mover) in parallel }

Tick Island[k].PreTickFunction (that eventually generates the trajectories with all the updated CMCs or Mover)

Tick Actor[k][0].SkeletalMeshComponent (or AnimNextComponent, that performs the MotionMatchInteraction queries for all the involved actors via DoSearch_AnyThread)

Tick Island[k].PostTickFunction (currently just a threading fence for the execution of all the other SkeletalMeshComponent(s) or AnimNextComponent(s))

for each Actor[k][i] { if (i != 0) Tick SkeletalMeshComponent[k][i] (or AnimNextComponent(s) that DoSearch_AnyThread get the cached result calculated by Tick Actor[k][0].SkeletalMeshComponent) in parallel } }

• next frame UPoseSearchInteractionLibrary::MotionMatchInteraction_Pure(TArray Availabilities, UObject* AnimInstance), with the context of all the published availabilities and created islands, will find the associated FInteractionIsland to the AnimInstance and call FInteractionIsland::DoSearch_AnyThread (via UPoseSearchInteractionSubsystem::Query_AnyThread) that will perform ALL (YES, ALL, so the bigger the island the slower the execution) the motion matching searches for all the possible Actors / databases / Roles combinations, and populate FInteractionIsland::SearchResults with ALL the results for the island. Ultimately the MotionMatchInteraction_Pure will return the SearchResults associated to the requesting AnimInstance with information about what animation to play at what time with wich Role.

Outputs