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Release notes

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A short note on every release: what's new, what's fixed and what to watch for when upgrading. The newest release is at the top.

1.0

Unreal Engine 5.8. The first release of the plugin. The previous prototype has a different API; there is no compatibility layer, so move your integration following the quick start.

What's inside: ray, sphere sweep, focus and tags; server requests, the claim ledger and two VR hands; physics items, the spear and destruction; VR manipulation with profiles: two hands of one player, socket/component/free anchors, scaling and rotation, physical holding, a bow and arrow, a wheel, part seating and strike events.

Network:

  • The server validates the pose of each hand separately: an obstacle in front of a free hand no longer makes the server drop an item in the other hand, and a locally deactivated first hand does not stop pose updates.
  • OnActionResult reports the rejection reason EInteractionRejectReason: Cooldown, InvalidTarget, InvalidPose, NotReachable, HandBusy, Claimed, Unavailable (13).
  • The network limits are set in Project Settings → Plugins → Interaction System and overridden on a single InteractorComponent (04).
  • bGrabEnabled and bCanBeGrabbed are replicated; SetGrabEnabled turns grabbing off and safely releases the current hands.
  • A physical item in the owner's hand is predicted and does not lag by a server round trip.
  • The manipulation snapshot is quantized and supports push model; resting items tick once per 0.5 s and wake on motion (Performance).

Manipulation:

  • A named part of an actor (TargetComponentName) — a drawer, a lid, a lever — stays under its parent, moves with it and returns to its place after a reset.
  • ResetManipulation returns an item to the home pose from the start of the game; SetHomeTransform changes it.
  • BreakDistance is counted from the body's closest approach, so a physical item taken from afar is not released at once.
  • AttachToSurface, SetFreeSimulation, IsAttached, SyncTransform and the claim ledger queries are available in Blueprint.

Targets:

  • UInteractionBlueprintGrabTargetComponent lets you describe a custom grab target in Blueprint (11).
  • The interface events OnGrab(Interactor) and OnRelease(Interactor, Reason, LinearVelocity, AngularVelocity) come from the core for any target; Blueprint can implement them but not call them.
  • An actor with only a target component gets focus only when it can be taken right now.

Physics and impacts:

  • Impact damage of a physics actor is off by default and configured in ObjectData; the impact sound has a threshold and a pause between repeats (05).
  • UInteractionDestructibleComponent accepts Niagara or Cascade effects, has configurable thresholds and an OnImpactDestroyed event.
  • The strike speed of UInteractionStrikeComponent is computed over the time between the item's poses.

Tools: the InteractionSystemDebug module with an on-screen panel and the commands InteractionOverlay, InteractionStatus, InteractionLog, InteractionClaims, InteractionRelease, InteractionResetAll (15). In Shipping builds the module registers nothing.

Demo: InteractionLab and SpearRange with five spears, targets, distance marks and E/F buttons; the VRLab map with seven stations and a desktop emulator; the Blueprint map VRLabBP with the same mechanics in Event Graphs. The desktop character uses Enhanced Input created in code. The split log in VRLabBP is replicated to all players. VRLab and VRLabBP use a shared palette from /InteractionSystem/Shared/Materials. All the content is inside the plugin; the Demo and Debug modules can be removed, and the tests skip their checks.

Documentation: step-by-step tutorials, a glossary, integration in Blueprint and C++, the network model, the API reference and a limitations page.

There is no separate CHANGELOG.md — changes are recorded on this page.