HexI2Basis.h

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basis[0] = 0.125 * (1.0 - rr) * (1.0 - ss) * (1.0 - tt) * (-rr - ss - tt - 2.0);
basis[1] = 0.125 * (1.0 + rr) * (1.0 - ss) * (1.0 - tt) * (rr - ss - tt - 2.0);
basis[2] = 0.125 * (1.0 + rr) * (1.0 + ss) * (1.0 - tt) * (rr + ss - tt - 2.0);
basis[3] = 0.125 * (1.0 - rr) * (1.0 + ss) * (1.0 - tt) * (-rr + ss - tt - 2.0);
basis[4] = 0.125 * (1.0 - rr) * (1.0 - ss) * (1.0 + tt) * (-rr - ss + tt - 2.0);
basis[5] = 0.125 * (1.0 + rr) * (1.0 - ss) * (1.0 + tt) * (rr - ss + tt - 2.0);
basis[6] = 0.125 * (1.0 + rr) * (1.0 + ss) * (1.0 + tt) * (rr + ss + tt - 2.0);
basis[7] = 0.125 * (1.0 - rr) * (1.0 + ss) * (1.0 + tt) * (-rr + ss + tt - 2.0);

basis[8] = 0.25 * (1.0 - rr * rr) * (1.0 - ss) * (1.0 - tt);
basis[9] = 0.25 * (1.0 + rr) * (1.0 - ss * ss) * (1.0 - tt);
basis[10] = 0.25 * (1.0 - rr * rr) * (1.0 + ss) * (1.0 - tt);
basis[11] = 0.25 * (1.0 - rr) * (1.0 - ss * ss) * (1.0 - tt);

basis[12] = 0.25 * (1.0 - rr) * (1.0 - ss) * (1.0 - tt * tt);
basis[13] = 0.25 * (1.0 + rr) * (1.0 - ss) * (1.0 - tt * tt);
basis[14] = 0.25 * (1.0 + rr) * (1.0 + ss) * (1.0 - tt * tt);
basis[15] = 0.25 * (1.0 - rr) * (1.0 + ss) * (1.0 - tt * tt);

basis[16] = 0.25 * (1.0 - rr * rr) * (1.0 - ss) * (1.0 + tt);
basis[17] = 0.25 * (1.0 + rr) * (1.0 - ss * ss) * (1.0 + tt);
basis[18] = 0.25 * (1.0 - rr * rr) * (1.0 + ss) * (1.0 + tt);
basis[19] = 0.25 * (1.0 - rr) * (1.0 - ss * ss) * (1.0 + tt);