Ue Physics Collision

A comprehensive reference for Unreal's collision and physics systems, covering everything from collision channels and trace queries to physics simulation and the Chaos engine. It walks you through the distinction between object type channels and trace channels (a common source of confusion), shows you the full suite of LineTrace, Sweep, and Overlap query variants, and includes practical setup for custom collision profiles in DefaultEngine.ini. The FCollisionQueryParams breakdown and FHitResult field reference are especially handy when you're debugging why a trace isn't behaving as expected. It skips the basics and assumes you know your way around UE, which makes it dense but useful when you need to remember whether to use ByChannel or ByObjectType for a given query.

skills.sh installs: 1.3K
GitHub stars: 446
last updated: Aug 21, 2026

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Install

$ npx -y skills add quodsoler/unreal-engine-skills --skill ue-physics-collision --agent claude-code

Installs into .claude/skills of the current project.

Files

UE Physics & Collision

Target engine: UE 5.8. APIs below are verified against the 5.8 headers; older forms are listed under "Deprecated — do not use".

Collision and physics live in the Engine module (UPrimitiveComponent, UWorld queries, FHitResult, UCollisionProfile) and the PhysicsCore module (FCollisionShape, UPhysicalMaterial, FBodyInstanceCore, ECollisionTraceFlag, EPhysicalSurface). The simulator itself is Chaos (Chaos / ChaosSolverEngine modules); destruction adds GeometryCollectionEngine and FieldSystemEngine. Most gameplay code only needs "Engine" and "PhysicsCore" in Build.cs.