WdgC1Basis.h

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