[vtkusers] vtkPLYWriter : vertices are not generated in a the PLY file

[MOUSSAUD David 244079]

Hi all,



I've got a problem to generate a simple ply file with 4 vertices.

Here how i proceed :



   // Setup points

    points = vtkSmartPointer<vtkPoints>::New();


     // Setup the colors array

    colors = vtkSmartPointer<vtkUnsignedCharArray>::New();

    colors->SetNumberOfComponents(3);

    colors->SetName("Colors");


    // create a vertex

    vertex = vtkSmartPointer<vtkVertex>::New();


    // list of all the vertices

    vertices= vtkSmartPointer<vtkCellArray>::New();


    /* Create a PLY Writer */

    plyWriter = vtkSmartPointer<vtkPLYWriter>::New();


    // Create a polydata object and add everything to it

    polydata = vtkSmartPointer<vtkPolyData>::New();

    polydata->SetPoints(points);

    polydata->SetVerts(vertices);

    polydata->GetPointData()->SetScalars(colors);



Then here how i create my vertices and how i set them :



    points->Resize(4);

    points->SetPoint(0, 0.0, 0.0, 0.0);

    points->SetPoint(1, 1.0, 0.0, 0.0);

    points->SetPoint(2, 0.0, 1.0, 0.0);

    points->SetPoint(3, 0.0, 0.0, 1.0);


    vertices->Initialize();


    vertex->GetPointIds()->SetId(0,0);

    vertices->InsertNextCell(vertex);


    vertex->GetPointIds()->SetId(0,1);

    vertices->InsertNextCell(vertex);


    vertex->GetPointIds()->SetId(0,2);

    vertices->InsertNextCell(vertex);


    vertex->GetPointIds()->SetId(0,3);

    vertices->InsertNextCell(vertex);


    colors->Initialize();

    colors->InsertNextTuple3(255,0,0);

    colors->InsertNextTuple3(0,255,0);

    colors->InsertNextTuple3(0,0,255);

    colors->InsertNextTuple3(255,255,255);



       QString plyFilePath = "output.ply";


    std::string filename = plyFilePath.toStdString();

    plyWriter->SetFileName(filename.c_str());


    plyWriter->SetInputData(polydata);



    plyWriter->SetColorModeToUniformPointColor();

    plyWriter->SetArrayName("Colors");

    plyWriter->SetFileTypeToASCII();

    plyWriter->Write();



I've checked that the 4 vertex are well displayed (cf screenshot).



Unfortunately, my ply file shows 0 vertex.



ply
format ascii 1.0
comment VTK generated PLY File
obj_info vtkPolyData points and polygons: vtk4.0
element vertex 0
property float x
property float y
property float z
property uchar red
property uchar green
property uchar blue
element face 0
property list uchar int vertex_indices
end_header



I'm using vtk 6.3.



If someone has already meet this problem or know the solution ...



Thanks for your time,

Best regards,



David MOUSSAUD.
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