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Once there was a reasonably good understanding of rational Bezier and non-uniform splines, we still had to put them together. Up to this point, the staff had not written or seen the form
: <math> P(t) = \frac{\sum_i w_i P_i b_i (t)}{ \sum_i w_i b_i (t) } </math>
<!-- : P(t) = ∑iwiPibi(t) / ∑iwibi(t) -->
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