• Spherical3[cnum, point1, point2] constrains point1 to be coincident with point2 in 3D space.
• Spherical3 constrains three degrees of freedom.
• Spherical3 essentially models a 3D ball-and-socket joint.
• The three equations in Spherical3 constrain the X, Y, and Z coordinates of the pointi to be equal.
• See also: DirectedPosition3, Revolute2, SetConstraints, SysCon.