2basisGradient[1] = ((-3 + 4 * rr + 4 * ss) * (-1 + tt) * tt) / 2.;
3basisGradient[2] = ((-1 + rr + ss) * (-1 + 2 * rr + 2 * ss) * (-1 + 2 * tt)) / 2.;
13basisGradient[9] = ((-3 + 4 * rr + 4 * ss) * tt * (1 + tt)) / 2.;
14basisGradient[10] = ((-3 + 4 * rr + 4 * ss) * tt * (1 + tt)) / 2.;
15basisGradient[11] = ((-1 + rr + ss) * (-1 + 2 * rr + 2 * ss) * (1 + 2 * tt)) / 2.;
39basisGradient[29] = -2 * (1 + 2 * rr * rr - 3 * ss + 2 * ss * ss + rr * (-3 + 4 * ss)) * tt;