The Tidal Stress Direction represents the direction of the tidal force vector representing all the tidal forces acting on the object. This force is a 3D vector, and the Tidal Stress Magnitude property represents the magnitude of the vector. Tidal Stress Direction is a read-only property that is automatically calculated by Universe Sandbox.
The Tidal Stress Direction property is located in the Tidal Effects section in the Motion tab of the object's properties panel.
Tidal Stress Direction is a unitless 3D vector with a magnitude of 1.