Sweep or extrude
Hi Tendai Katsuwa,
I would say both are very useful. Extrude is most used for applying volume perpendicular to a 2d plane such as a box, cylinder. While sweep is mostly for applying volume along a path. like spring, handle etc.
Basically, importance of both will be different from case to case.
There are also times that extrude does not work. A possible cause is an unclosed polygon that is supposed to be extruded. But at rare times from my experience it is a software bug or software is unresponsive. So what I do is I make a path to an axis that I desire and sweep the 2d plane to it so it would have a volume to make a box/cylinder. If it still won't work, I redraw.
There are also instances that sweep can be an alternative for revolve or vise versa but for circular path only. Before, I had also experienced that the object I wanted to revolve doesn't work. A possible cause is an unclosed polygon also but there are rare times that it is also caused by a bug/ the software is unresponsive. So instead of revolving the 2d plane I make a circular path and sweep on it. And If it also still won't work, I redraw, too.
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Thank you Tendai Katsuwa!