1. A vehicle interior manufacturing method comprising: accessing, via a computer processor, a vehicle occupant packaging design representing an orientation of portions of an interior space of a new generation of a vehicle that are occupied by a human subject and accessing a task to be accomplished by the human subject within the interior space of the new generation of the vehicle design, the human subject represented by a virtual human subject comprising a plurality of degrees of freedom, the task comprising an endpoint direction of motion; accessing, via the computer processor, a set of constraints limiting how the degrees of freedom of the virtual human subject are manipulated to accomplish the task; determining, via the computer processor, a Jacobian between the degrees of freedom and the task during accomplishment of the task, wherein the Jacobian is based on determining a manipulation over time of the degrees of freedom of the virtual human subject that accomplishes the task while obeying the set of constraints; wherein the set of constraints comprise a contact constraint preventing motion by the virtual human subject away from a component present in the vehicle occupant packaging design during the task to be accomplished, a discomfort constraint rewarding the virtual human subject for postures where joints are near a neutral position and increasing a penalty when the joints approach joint limits, and a dynamic consistency constraint preferencing a solution to a degree of freedom vector that minimizes energy required to complete the task with diagonal coefficients corresponding to diagonal elements of a joint space inertia matrix and ensuring that the virtual human subject is dynamically balanced during the task; determining, via a computer processor, a manipulability metric based on the Jacobian and the endpoint direction of motion, the manipulability metric quantifying a capability of the virtual human subject to perform the task along the endpoint direction of motion; evaluating a feasibility of the vehicle occupant packaging design based upon the manipulability metric prior to manufacturing; and manufacturing the interior space of the new generation of the vehicle based on the evaluated feasibility of the vehicle occupant packaging design when the manipulability metric satisfies a threshold.