[vtkusers] vtkDelauany2D triangulation--But where are the triangles????

[Dhaniram Kshirsagar]

Hi Sylvain,
 After setting the vtkcellarray(for polys) in vtkpolydata (which is input to
the delaunay2d), Now I am able to get the triangles.
 Thankx

 2005/11/4, Sylvain Jaume <sylvain.jaume at kitware.com>:
>
> Hi Dhaniram Kshirsagar,
>
> You don't need to use delaunay->SetSource().
> Use it only if you want constrained Delaunay.
>
> Cheers,
> Sylvain
>
> Dhaniram Kshirsagar wrote:
>
> > Hi,
> >
> > I searched the entire mail archive for answer to my problem, but found
> > only problems no solutions to them.
> >
> > My problem is, I have input points in the form of x, y and z (large
> > numbers(double type)) and i want the output as the set of triangles,
> > however i am getting only the
> > vertics.
> >
> > Here is the code snippet that i am using to get the output as set of
> > triangles.
> >
> > vtkDelaunay2D* pDelny = vtkDelaunay2D::New( );
> > vtkPolyData* pPointSet = vtkPolyData::New( );
> > vtkPoints* pPoints = vtkPoints::New( );
> >
> > //collects the points i.e. x , y, and z
> > GetPoints( pPoints );
> >
> > pPointSet->SetPoints( pPoints );
> >
> > //now generate the vtk file
> > vtkPolyDataWriter* writer = vtkPolyDataWriter::New();
> > writer->SetFileName( "c:\\earth.vtk");
> > writer->SetInput( pPointSet );
> > writer->Write(); //throws an exception
> > writer->Update();
> > * /***the generated vtk file contains the only one fixed
> > value***/
> > ///However i am not usig this file
> > *
> > pDelny->SetTolerance( 0.001 );
> > //pDelny->SetBoundingTriangulation(1);
> > pDelny->SetAlpha( 1 );
> > //pDelny->BoundingTriangulationOff();
> > //pDelny->SetOffset( 1000 );
> >
> > pDelny->SetInput(pPointSet);
> > pDelny->SetSource( pPointSet );
> > pDelny->Update();
> >
> >
> > vtkPolyData* pVtkData = pDelny->GetOutput( );
> > int nsize = pVtkData->GetNumberOfCells(); //returned the same number
> > as the number of points
> > vtkCellArray* cellPol = pVtkData->GetPolys(); //zero returned
> > int numpol = cellPol->GetNumberOfCells();
> > vtkCellArray* cellVert = pVtkData->GetVerts();
> > int numver = cellVert->GetNumberOfCells(); //returned the same number
> > as the number of points
> >
> > nCells = pVtkData->GetNumberOfPolys();
> > nCnt3 = pVtkData->GetNumberOfVerts(); //returned the same number as
> > the number of points
> >
> > But where are the triangles????
> >
> > Now through pDelny->GetOutput I am expecting set of triangles in
> > vtkPolyData object.
> > Am I right?
> >
> > Thanks
> >
> >------------------------------------------------------------------------
> >
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