[vtkusers] determine mesh connectivity from point data

[Luke Bloy]

Thanks rob, that looks promising although I haven't been able to get it 
to work.

Here is a little more info.

I have a bunch of points which i know lie on a sphere. I'd like to be 
able to have a polydata object that represents it. I was tring to use a 
vtkGeometryFilter to extract the sphere's surface. needless to say this 
didn't work.

what i have so far is this.

  vtkPolyData *output = vtkPolyData::New();

  newPoints->Squeeze();
  output->SetPoints(newPoints);
  newPoints->Delete();

  newNormals->Squeeze();
  output->GetPointData()->SetNormals(newNormals);
  newNormals->Delete();

 vtkDelaunay3D *del3D = vtkDelaunay3D::New();
  del3D -> SetInput( output );
  del3D -> BoundingTriangulationOn();
 
  vtkGeometryFilter *geoFilter = vtkGeometryFilter::New();
  geoFilter->SetInputConnection(del3D->GetOutputPort());
  geoFilter->SetOutput(output);
  geoFilter->Update();

anyone have any suggestions?

-Luke


Robert Haines wrote:
>> I have what is hopefully a simple question.
>>
>> I have an array of points in 3D and I would like generate a 
>> vtkPolyData object. Is there a way to generate the polygons 
>> automatically? or do i have to come up with a algorithm to sort them 
>> and determine the connectivity?
>
> vtkDelaunay3D will triangulate points in 3D into a set of 
> tetrahedrons. http://www.vtk.org/doc/release/5.4/html/a00405.html
>
> Rob
>