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

[Sylvain Jaume]

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
>
>------------------------------------------------------------------------
>
>_______________________________________________
>This is the private VTK discussion list. 
>Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>Follow this link to subscribe/unsubscribe:
>http://www.vtk.org/mailman/listinfo/vtkusers
>  
>