[vtkusers] Cutting non-convex surfaces

[Dan Asimov]

Hi David,

Thanks for your reply.

Actually, I tried vtkStripper, but as you said it just generated a polyline
consists of the same line segments in the same wrong order, which is kind of
useless here.

I don't know but it looks to me that no filter will be able to get the
correct ("expected") order of the line segments except the cutter object
itself. After cutting, the result is just some scattered lines.

What do you think? Am I missing something??

Thanks,
Dan


On Tue, Aug 16, 2011 at 11:05 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Dan,
>
> The fact that your surface is non-convex is not what is causing the
> problem.
>
> The problem is that vtkCutter generates a whole bunch of independent
> line segments, but what you want is a single polyline.  The filter to join
> the line segments to create a polyline in vtkStripper.
>
> Also note that vtkStripper will _not_ put the points in the correct order.
> What it does is generate a polyline cell array that contains the correct
> ordering of the PointIDs.
>
>  - David
>
>
> On Tue, Aug 16, 2011 at 8:38 AM, Dan Asimov <dan.asimov at gmail.com> wrote:
> >
> > Any idea anyone? Is there a way to cut non-convex surfaces?
> >
> >
> > Thanks,
> > Dan
> >
> >
> >
> > On Fri, Aug 12, 2011 at 2:47 PM, Dan Asimov <dan.asimov at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I've a non-convex shape that I need to cut through. The user draws two
> >> contours parallel X-Y plane, then I generate the surface using
> >> vtkVoxelContoursToSurfaceFilter. However, when I cut with a plane
> parallel
> >> to x-y using vtkCutter, the order of the points of the generated result
> is
> >> messed up (pls see the attachments). I tried to run many filters on this
> >> result to get the expected one without success.
> >>
> >> Can anyone help me on how to cut this surface to get the expected
> result?
> >>
> >> Thanks,
> >> Dan
>
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