Function shapeFunctions

SRC/element/shell/ASDShellT3.cpp:163–168

shape functions

    // shape functions
    inline void shapeFunctions(double xi, double eta, Vector& N)
    {
        N(0) = 1.0 - xi - eta;
        N(1) = xi;
        N(2) = eta;
    }

    // shape function derivatives in iso-parametric space
    inline void shapeFunctionsNaturalDerivatives(double xi, double eta, Matrix& dN)