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Vertices and Polygons

I have an N-element list of vertices v(3,N) which describe a series of
points on a surface of a complex object.

Is there an IDL function or method which would sort through this list
and generate the polygon array that is required by POLYSHADE for doing
surface rendering?

It's been awhile since I've used IDL so maybe there's a newer object
oriented approach that you could recommend.

Thanks in advance for any pointers.
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