The subject about vectors and everything related is not over ...
Vetorial tools give a lot of power to create and edit curves and shapes. But all this power has a price. You must to know how to use it.
Look at the picture. It shows a curve (at right) and a set of related structural vectors. It's easy to see the bad conjugation: there are a lot of crossing and overlapping. Most of operations made using this vectors will produce weird, not useful or unexpected results.
Is it a reason to not invest in this kind of tool? I don't think so. The "good" user can achieve nice results, at least after some training.
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