Suppose the initial curve is a Bézier curve of degree m, rm(u) = ∑;i=0m riBim(u),
and let each ri traverse a Bézier curve of degree n, ri = ri(v) = ∑j=0m rijBjn(v),
then the point rm,n(u,v) on the surface is given by rm,n(u,v) = ∑;i=0m ∑j=0m rijBim(u)Bjn(v)
"Bézier surface." A Dictionary of Computing. . Encyclopedia.com. (October 19, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/bezier-surface
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