| body | --uriencoded--$$ \normalsize \begin%7Bcases%7D N_0(u,v) = 0.25 (1-u) (1-v) \\ N_1(u,v) = 0.25 (1+u) (1-v) \\ N_2(u,v) = 0.25 (1+u) (1+v) \\ N_3(u,v) = 0.25 (1-u) (1+v) \end%7Bcases%7D \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad (4) $$ |
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