1. A system to measure skin movement and strain on a body under test, the system comprising: a data collection system which collects data from the body under test wherein the data collection system is adapted to collect data from the body under test while the body is at rest and while the body is undergoing a motion; a processing system coupled to receive data from said data collection system, said processing system for processing the data to model and quantify skin movement and to derive strain fields, contours and three-dimensional patterns of skin on the body under test; wherein said data collection system comprises: a motion capture system which obtains position data at locations identified by a plurality of markers disposed on the surface of the skin of the body under test; and a tracking system corresponding to a three-dimensional laser tracker system wherein said processing system comprises a lines of non-extension (LONEs) processor coupled to receive data from said data collection system and to analyze changes in distance between position data at each marker point and its closest neighbors from initial position to deformation; wherein said LONEs processor calculates second order Lagrangian strains in accordance with: ɛ = l 2 - l 0 2 2 ⁢ l 0 2 = Δ ⁢ ⁢ l l 0 + ( Δ ⁢ ⁢ l ) 2 2 ⁢ ⁢ l 0 2 ; In which: l is the new distance between two points; l o is the original length between two points; and Dl is the difference between the two.