[vtkusers] connecting points in from vtkPoints

[Bill Lorensen]

This example
http://vtk.org/Wiki/VTK/Examples/ExtractPolyLinesFromPolyData#ExtractPolyLinesFromPolyData.cxx
shows you how to extract the polylines from vtkCutter followed by vtkStripper.

On Mon, Feb 1, 2010 at 1:29 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> You can get the number of lines with:
>
> yourPolyData->GetNumberOfLines();
>
> You can get the lines with something like:
>
> vtkIdType npts;
> vtkIdType *indx;
>
> cells = yourPolyData->GetLines();
>
> for (cells->InitTraversal(); cells->GetNextCell(npts,indx); )
> ....
> indx is an index into the points.
>
> On Mon, Feb 1, 2010 at 12:16 PM, Rakesh Patil <rakeshthp at in.com> wrote:
>>
>>
>> Hi.
>>
>> I guess vtkStripper produces vtkPolydata as its output.. so How can be the
>> polyline extracted from vtkstripper?
>> As u said, i'm using the points from stripper and producing polyline of my
>> own..
>>
>> Thanks
>>
>> ---------- Original message ----------
>> From:Bill Lorensen< bill.lorensen at gmail.com >
>> Date: 01 Feb 10 19:19:48
>> Subject: Re: [vtkusers] connecting points in from vtkPoints
>> To: Rakesh Patil
>>
>> Are you using the polyline generated by the stripper or creating your
>> own? You must use the one produced by the stripper.
>>
>>
>> On Mon, Feb 1, 2010 at 4:14 AM, Rakesh Patil wrote:
>>>
>>> Yes it does changes ... I get the points.. But when i connect these points
>>> using polyline, again i get a zigzag lines...
>>>
>>> ---------- Original message ----------
>>> From:David Doria< daviddoria+vtk at gmail.com >
>>> Date: 31 Jan 10 01:22:41
>>> Su bject: Re: [vtkusers] connecting points in from vtkPoints
>>> To: rakeshthp at in.com
>>>
>>> Thanks,
>>>
>>> David
>>>
>>>
>>>
>>> On Sat, Jan 30, 2010 at 12:25 PM, Rakesh Patil wrote:
>>>> I need to store the points in an array.. but vtkStripper is not returning
>>>> the points.. i tried implementing it as follows
>>>>
>>>> vtkStripper *sp = vtkStripper::New();
>>>>
>>>> sp->SetInputConnection( contFilter->GetOutputPort());
>>>>
>>>> vtkPoints *pt = sp->GetPoints();
>>>>
>>>> Here pt is not showing any values.. It is all empty..
>>>>
>>>> ---------- Original message ----------
>>>> From:Bill Lorensen< bill.lorensen at gmail.com >
>>>> Date: 3 0 Jan 10 18:44:20
>>>> Subject: Re: [vtkusers] connecting points in from vtkPoints
>>>> To: Rakesh Patil
>>>>
>>>> Use vtkStripper to order the line segments output from vtkContourFilter.
>>>>
>>>> On Fri, Jan 29, 2010 at 5:30 AM, Rakesh Patil 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
>>>>>
>>>>>
>>>>> Dear vtkusers ! Get Yourself a cool, short @in.com Email ID now!
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>> &gt ;>>
>>>>
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>>>>
>>>
>>> Try updating the stripper:
>>>
>>> vtkSmartPointer stripper =
>>> vtkSmartPointer::New();
>>> st ripper->SetInputConnectio n( contFilter->GetOutputPort());
>>> stripper->Update();
>>> vtkPoints *pt = stripper->GetPoints();
>>>
>>> Does that change anything?
>>>
>>> Dave
>>> _______________________________________________
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>>> Visit other Kitware open-source projects at
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>>
>