Physics audit
Discovery
get_physics_stack— packages, module hints, script labelsget_physics_settings— DynamicsManager / Physics2D settingsget_layer_collision_matrix— layer collision matrixlist_packages—com.unity.physics, Havok, U2D Physics
Checklist
- Know which backend ships: classic PhysX / Box2D vs Unity Physics vs Physics Core 2D.
- Unity 6.4+ allows disabling built-in physics modules to shrink builds — only if unused.
- Physics Core 2D was renamed from LowLevelPhysics2D (
Unity.U2D.Physics) in 6.5. - For ECS projects, confirm baking/authoring components and no accidental dual simulation.
Related
unity-dots-subscenes,unity-2d-tilemap-sprites,unity-build-size-optimization