[vtkusers] vtkStructuredGrid for tube

[Jim]

Hi VTK Gurus,
I am thinking about using a structured grid to represent a tube.  Per the vtk 
textbook, a "[a structured] grid may be warped into any configuration in which 
the cells do not overlap or self-intersect".  Is it a problem if the last set 
of points is the same as the first?  Basically, the grid would wrap around to 
itself to close the tube.

In limited testing, it seems to work, but I wanted to ask if anyone knows of 
how this might bite me later on--e.g., would other filter algorithms choke on 
this, etc?

thanks.

--Jim