Bij(s,t) = (nij)sitj(1 - s - t)n - i - j ; i,j >= 0, i+j <= n
(nij) = n!/{i!j!(n-i-j)!}
Let {Pij}, i,j >=0, i+j<=n, be a triangular array of control points and define a triangular surface B(s,t) by setting
B(s,t) = SUMij Bij(s,t)Pij
(s,t) in DELTA = {(s,t) | s,t>=0 and s+t<=1}
(see Figure 2)
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