Collision Response Reference
- Presets: Default, Custom, NoCollision, BlockAll, OverlapAll, BlockAllDynamic, OverlapAllDynamic, IgnoreOnlyPawn, OverlapOnlyPawn, Pawn, Spectator, CharacterMesh, PhysicsActor, Destructible, InvisibleWall, Trigger, Ragdoll, Vehicle, UI. Custom presets in Project Settings > Engine > Collision.
- Collision Enabled: No Collision (no physics representation; best performance), Query Only (raycasts, sweeps, overlaps; good for character movement), Physics Only (simulation only; e.g. secondary motion), Collision Enabled (both).
- Object Types: WorldStatic (doesn't move), WorldDynamic (moves by animation/code, kinematic: lifts, doors), Pawn, PhysicsBody (moved by simulation), Vehicle, Destructible.
- Responses Ignore/Overlap/Block: "it's the interaction between both Physics Bodies that define the resulting action". Overlap event if other is Overlap or Block; Hit if other Blocks.
- Trace channels: Visibility, Camera.