The data in the vtp is just a set of points (vertices). I wanted to get a surface from the points.<br><br>Here's what I've tried:<br><br><br> vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New();<br>
reader->SetFileName(InputFile.c_str());<br> reader->Update();<br> cout << "NumPoints: " << reader->GetOutput()->GetNumberOfPoints() << endl;<br><br> vtkSmartPointer<vtkContourFilter> CF = vtkSmartPointer<vtkContourFilter>::New();<br>
//CF->SetValue(0,128);<br> double range[2];<br> range[0] = 0;<br> range[1] = 1000;<br> CF->GenerateValues(0, range);<br> CF->SetInputConnection(reader->GetOutputPort());<br> CF->Update();<br>
<br> vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New();<br> writer->SetInputConnection(CF->GetOutputPort());<br> writer->SetFileName(OutputFile.c_str());<br>
writer->Update() ;<br><br>but it just makes an empty file. Where have I gone wrong?<br><br clear="all">Thanks,<br><br>David<br>
<br><br><div class="gmail_quote">On Wed, Mar 4, 2009 at 10:00 AM, Bryn Lloyd <span dir="ltr"><<a href="mailto:blloyd@vision.ee.ethz.ch">blloyd@vision.ee.ethz.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Is your data a surface? Is there data associated with the polydata?<br>
<br>
What do you expect marching cubes to give you? (lines?)<br>
<br>
<br>
You could use vtkContourFilter, it works on any kind of vtkDataSet, i.e. polydata...<br>
<br>
<a href="http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html" target="_blank">http://www.vtk.org/doc/nightly/html/classvtkContourFilter.html</a><br>
<br>
--Bryn<br>
<br>
<br>
<br>
<br>
David Doria wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5">
I am reading in a vtp file and then trying to run the vtkMarchingCubes filter. It says the input is of type vtkPolyData, but a vtkImageData is required.<br>
<br>
I tried to use vtkMarchingContourFilter and it says no data to contour.<br>
<br>
It makes sense that the points should be on a structured grid, but how do I create one?<br>
<br>
Thanks,<br>
<br>
David<br>
<br>
<br></div></div>
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Bryn Lloyd<br>
Computer Vision Laboratory<br>
ETH Zürich, Sternwartstrasse 7<br>
CH - 8092 Zürich, Switzerland<br>
Tel: +41 44 63 26668<br>
Fax: +41 44 63 21199<br>
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