HexC1Basis.h

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basis[0] = (1.0 - rr) * (1.0 - ss) * (1.0 - tt) / 8.0;
basis[1] = (1.0 + rr) * (1.0 - ss) * (1.0 - tt) / 8.0;
basis[2] = (1.0 + rr) * (1.0 + ss) * (1.0 - tt) / 8.0;
basis[3] = (1.0 - rr) * (1.0 + ss) * (1.0 - tt) / 8.0;

basis[4] = (1.0 - rr) * (1.0 - ss) * (1.0 + tt) / 8.0;
basis[5] = (1.0 + rr) * (1.0 - ss) * (1.0 + tt) / 8.0;
basis[6] = (1.0 + rr) * (1.0 + ss) * (1.0 + tt) / 8.0;
basis[7] = (1.0 - rr) * (1.0 + ss) * (1.0 + tt) / 8.0;