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(Left) Hard contact distance, rH, for a cube centered on the origin and a sphere with center point given by the polar spherical coordinate, ϕS. The side lengths of the cube and the diameter of the sphere are both unity. All other spherical coordinate angles and Euler angles are zero. (Right) The cube-sphere potential energy at hard contact as a function of the two spherical coordinates, the azimuthal angle, θS, and the polar angle, ϕS.
