[vtkusers] How can produce a vol using two similar areas?

[freshfish]

That's like extrude ,but it's more like map (I call it temporarily) ,rather
than linear extrude at least.
I describe it here:If we have two similar areas, that's say, the two areas
are not equal ,but have the same number vertex stored in 2 arrays in Against
the clock rules and the profile , for a very simple example, a triangle and 
a bigger
triangle is a similar area in my title,so how to produce a vol using two
similar areas?
I don't know whether you get my words.
Thanks in advance.

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