2 basis[0 * 3 + 0] = 0.5 * (1.0 - ss);
3 basis[0 * 3 + 1] = 0.0;
4 basis[0 * 3 + 2] = 0.0;
6 basis[1 * 3 + 0] = 0.0;
7 basis[1 * 3 + 1] = 0.5 * (1.0 + rr);
8 basis[1 * 3 + 2] = 0.0;
10 basis[2 * 3 + 0] = -0.5 * (1.0 + ss);
11 basis[2 * 3 + 1] = 0.0;
12 basis[2 * 3 + 2] = 0.0;
14 basis[3 * 3 + 0] = 0.0;
15 basis[3 * 3 + 1] = -0.5 * (1.0 - rr);
16 basis[3 * 3 + 2] = 0.0;