The surface normal at the point of contact. In all non-overlapped cases, this will be a unit-normal. If there was an initial overlap, the normal will be zero (degenerate) along with the PhysicsQuery.WorldCastResult.fraction being zero and PhysicsQuery.WorldCastResult.point being an arbitrary point in the overlapped region. See PhysicsQuery.WorldCastResult.point.

public Vector2 normal { get; }