[vtkusers] plyWriter from polydata: help pleaaase

[Alex Malyushytskyy]

You  are trying to pass undefined pointer, which is then "filled with
3 coordinates".

> double* x;
...
> this->Input->GetPointCoordinates(v1,x);
....

Replace
> double* x;
> double* y;
> double* z;

with
 double x[3];
 double y[3];
 double z[3];

Also naming it x is misleading, I would suggest xyz0[3], xyz1[3], etc

Alex


On Mon, Sep 17, 2012 at 8:52 AM, cerina <cerine-baratelli at hotmail.fr> wrote:
> hi,
>
> Ichanged my previous code (using the extraction here :
> http://vtk.1045678.n5.nabble.com/vtkPLYWriter-and-polydata-td5716117.html
> http://vtk.1045678.n5.nabble.com/vtkPLYWriter-and-polydata-td5716117.html
> to creating a new polydata from a list of points in order to write a *PLY
> File* from it.
>  i have this code:
> // Assign all points to root node
> for (int i=0;i<this->Input->GetNumberOfPoints();i++)
> PointsNode->SetValue(i,0);
>
> int NumberOfSplitNodes;
> int Level=0;
> for(int h=0;h<8; h++)
> {
> .................. // subdividing the octree
> }
> for(int m=0; m<NumberOfSplitNodes; m++)// debut de boucle des régions
> {
> vtkIdType v1;
> vtkIdType v2;
> vtkIdType v3;
> vtkIdList *pts=vtkIdList::New();
> vtkPoints* points = vtkPoints::New();
> vtkSmartPointer&lt;vtkCellArray> vertices =
> vtkSmartPointer<vtkCellArray>::New();
> vtkSmartPointer<vtkCellArray> triangles =
> vtkSmartPointer<vtkCellArray>::New();
> vtkSmartPointer<vtkTriangle> triangle = vtkSmartPointer<vtkTriangle>::New();
> vtkSmartPointer<vtkLine> line0 = vtkSmartPointer<vtkLine>::New();
> vtkSmartPointer<vtkLine> line1 = vtkSmartPointer<vtkLine>::New();
> vtkSmartPointer<vtkLine> line2 = vtkSmartPointer<vtkLine>::New();
> vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New();
> for (int k=0; k<this->Input->GetNumberOfCells();k++)
> {
> if(PointsNode->GetValue(k)==m)
> {
> double* x;
> double* y;
> double* z;
> this->Input->GetFaceVertices(k,v1,v2,v3);
> pts->InsertNextId(v1);
> pts->InsertNextId(v2);
> pts->InsertNextId(v3);
> vertices->InsertNextCell(pts);
> triangle->GetPointIds()->SetId(v1,v1);
> triangle->GetPointIds()->SetId(v2,v2);
> triangle->GetPointIds()->SetId(v3,v3);
> triangles->InsertNextCell(triangle);
> this->Input->GetPointCoordinates(v1,x);
> points->InsertNextPoint(x);
> this->Input->GetPointCoordinates(v2,y);
> points->InsertNextPoint(x);
> this->Input->GetPointCoordinates(v3,z);
> points->InsertNextPoint(x);
> line0->GetPointIds()->SetId ( 0,v1 );
> line0->GetPointIds()->SetId ( 1,v2 );
> line1->GetPointIds()->SetId ( 0,v2 );
> line1->GetPointIds()->SetId ( 1,v3 );
> line2->GetPointIds()->SetId ( 0,v1 );
> line2->GetPointIds()->SetId ( 1,v3 );
> lines->InsertNextCell ( line0 );
> lines->InsertNextCell ( line1 );
> lines->InsertNextCell ( line2 );
> }
> }
>  vtkSmartPointer<vtkPolyData> newdata =
> vtkSmartPointer<vtkPolyData>::New();
> newdata->SetPoints(points);
> newdata->SetVerts(vertices);
> newdata->SetLines(lines);
> newdata->SetPolys(triangles);
> vtkPLYWriter *Writer=vtkPLYWriter::New();
>
> Writer->SetInput(newdata);
> std::stringstream strfile;
> strfile<<"Region"<<m&lt;&lt;&quot;.ply&quot;;
> Writer->SetFileName(strfile.str().c_str());
> Writer->Write();
> }
>
> one time , it creates ply files which contains just points, an other time,
> it crashes, and when i debug it, i didn't find the line that make it crashed
>
> thanks for help
>
> Regards,
>
> Cerina
>
>
>
> --
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