Position Track to Spline
This command converts an object’s animation path to a spline. First, select the object whose X, Y and Z position tracks you want to be converted to a spline. Next, activate the Position Track to Spline command. Cinema 4D will create a Spline object that corresponds to the position path of the object. You can edit the spline and reassign it to the object using the Spline to Position Track command (see below).