[vtkusers] connecting points in from vtkPoints

[siqi chen]

The reason is that the points from the vtkContourFilter are not ordered. You
need to reorder these points.  I can share with you one function I wrote
yesterday which solves exactly the same problem.
The input is the vtkpolydata you extract from contourfilter or
marchingsquares. The output is a vector which stores the ordered index of
the original points. For example, if the output vector is {1, 3, 5, 2, 4},
which means you can connect points 1 3 5 2 4 and they are in ordered. Of
course there are two ways of connection, clockwise or counter-, you can
change it in the function also. I have a comment there you can find.

http://www.rpi.edu/~chens/download/connectivityDetermine.cpp

I can't guarantee if will work on your data set, since it is still very
preliminary,  just give it a try.

Siqi


On Fri, Jan 29, 2010 at 5:30 AM, Rakesh Patil <rakeshthp at in.com> wrote:

> Hello,
>
> I have a scatter data, (xyz file), where x and y are long, and lat resp and
> z is depth. I need to extract a zero contour from this xyz data. I use
> vtkContourFilter to extract the points for zero contour.
>
> I get the points what i require correctly.. But if i connect them serially,
> it shows that points are connected in a zig-zag form. I get points directly
>
> from contuorfilter. i.e.
>
> vtkPoints *pts = contFilter->GetOutput()->GetPoints();
>
> What and how do i do, so that when i connect the points, i get a decent
> connected line, instead of zig zag ..?
>
> Thanks
>
> Regards
>
>
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