This project presents a C++ implementation of multidimensional cubic B-spline for the fast estimation of lengths and three-dimensional moment arms for musculotendon actuators.
At first, an OpenSim musculoskeletal model is used to establish the length of each musculotendon actuator for different generalized coordinates (joint angles). Then, multidimensional spline function is computed to fit the previous data. Muscle moment arms are obtained by differentiating the musculotendon length spline function with respect to the generalized coordinate of interest.