Skeletal Mesh {Actor} : SkeletalMeshActor has no PhysicsAsset assigned.: In order for a SkeletalMesh to have an accurate bounding box, it needs to have a PhysicsAsset assigned in its SkeletalMeshComponent. An incorrect or inaccurate bounding box can lead to the mesh vanishing when its origin is not in view, or to poor shadow resolution because the bounding box is too big.