[CST-2] Graphics, knot vectors

[Raymond Chan]

> Can anyone tell me what do we do with the "division by zero"s when
> finding knot vectors? cos I don't quite understand the whole topic.

I haven't looked in detail at your answers, but I think generally, if you
get your subscripts right (which I find it hard to do, it's so fiddly, have
to be quite meticulous and careful) then anytime there would be a division
by zero, the basis function N(t) is also zero, so you get a slightly dodgy
thing of (something / 0) * 0 = 0.

Raymond