Work with static and skeletal meshes in Unreal C++ — UStaticMesh + UStaticMeshComponent, USkeletalMesh + USkeletalMeshComponent + USkinnedMeshComponent, instanced meshes (ISM/HISM), material slots (SetMaterial/GetMaterial), sockets (static and skeletal), collision setup (UBodySetup, ECollisionTraceFlag, simple vs complex), the Skeleton/PhysicsAsset relationship, classic LODs, and mesh sections. Use when assigning or swapping meshes in C++, configuring collision, choosing ISM vs HISM vs individual components, attaching to mesh sockets, overriding material slots, querying LOD data, or debugging missing materials, wrong skeleton, or silent socket attachment failures.
