<div dir="ltr"><br><div class="gmail_quote"><div dir="ltr">On Tue, May 1, 2018 at 10:52 PM pnt1614 <<a href="mailto:minpu.code@gmail.com">minpu.code@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I am using a vtkFeatureEdge to extract a boundary edges and everything works<br>
fine. Now I want to render points on the boundary edge so I try to use<br>
vtkEdgePoints but there is an "No scalar data to contour<br>
" error. I found out that the boundary edge has no scalars. Is there<br>
something missing? or is this a bug?<br></blockquote><div><br></div><div>vtkFeatureEdges does indeed copy data arrays to its output, so that is not the problem. vtkEdgePoints expects a point data array to use for interpolating points along edges. However, vtkSTLReader does not create any point data arrays - I'm not sure STL files can even store data arrays.</div><div><br></div><div>If you just want to render the points in the vtkPolyData extracted from vtkFeatureEdges, call</div><div><br></div><div>edgeActor->GetProperty()->SetRepresentationToPoints();</div><div><br></div><div>HTH,</div><div>Cory</div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
<br>
                // Load a stl file <br>
                //...<br>
                vtkSmartPointer<vtkPolyData> data = pSTLReader->GetOutput();                            //<br>
vtkPolyData 형식으로 받아오기<br>
                                                                                                                                                                                                        // Create a mapper and actor<br>
                vtkSmartPointer<vtkPolyDataMapper> mapper =<br>
vtkSmartPointer<vtkPolyDataMapper>::New();<br>
                mapper->SetInputData(data);<br>
<br>
                vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();<br>
                actor->SetMapper(mapper);<br>
<br>
<br>
                //---------------edges-----------<br>
                vtkSmartPointer<vtkFeatureEdges> edges =<br>
vtkSmartPointer<vtkFeatureEdges>::New();<br>
                edges->SetInputConnection(pSTLReader->GetOutputPort());<br>
                edges->BoundaryEdgesOn();<br>
                edges->FeatureEdgesOff();<br>
                edges->ManifoldEdgesOff();<br>
                edges->NonManifoldEdgesOff();<br>
                edges->Update();<br>
<br>
                int test = edges->GetColoring(); // the result is 1<br>
<br>
                vtkSmartPointer<vtkPolyDataMapper> edgeMapper =<br>
vtkSmartPointer<vtkPolyDataMapper>::New();<br>
                edgeMapper->SetInputConnection(edges->GetOutputPort());<br>
<br>
                vtkSmartPointer<vtkActor> edgeActor = vtkSmartPointer<vtkActor>::New();<br>
                edgeActor->SetMapper(edgeMapper);<br>
                edgeActor->GetProperty()->SetLineWidth(3.0);<br>
<br>
<br>
                vtkSmartPointer<vtkEdgePoints> e_points =<br>
vtkSmartPointer<vtkEdgePoints>::New();<br>
                e_points->SetInputConnection(edges->GetOutputPort());<br>
                e_points->SetValue(1150);<br>
                e_points->Update();<br>
<br>
                vtkSmartPointer<vtkActor> e_a = make_an_actor(e_points->GetOutputPort());<br>
<br>
                vtkSmartPointer<vtkRenderer> renderer =<br>
vtkSmartPointer<vtkRenderer>::New();<br>
                renderer->AddActor(e_a);<br>
<br>
<br>
<br>
--<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Cory Quammen<br>Staff R&D Engineer<br>Kitware, Inc.</div></div>