public static extern TrivIGACtrlPtStruct *TrivIGATVEval(int ArgmntID, TrivTVStruct *TV, TrivIGAEvalType EvalType, int IndexU, int IndexV, int IndexW, double U, double V, double W);
public static extern double *TrivIGATVEvalBasis(int ArgmntID, TrivTVStruct *TV, TrivIGAEvalType EvalType, TrivTVDirType Dir, int Index, double t);