[vtkusers] How to get the topological information?

[amr Ismail abdel]

Dear vtk users;
I have unstructured points cloud xyz describing a face of building no
topology for the cloud points available. My question is How to get the
topological information? for example the the  neighbors of any point. 

I searched in the mail user and used  vtkDelaunay3D without succee, my code is below, pleas help
Thank you
Amr

vtkPoints* cloud1      = vtkPoints::New();
    vtkCellArray *Vertices1 = vtkCellArray::New(); 
   
    std::ifstream in;
       
 in.open("data\\scan3.nor");
        if ( !in ) {
        puts("Cannot open file");
        exit(0);
    }
        in >> mypoint_1[0] >> mypoint_1[1] >> mypoint_1[2];
    while( in ) {
        cloud1->InsertNextPoint(mypoint_1);
            in >> mypoint_1[0] >> mypoint_1[1] >> mypoint_1[2];
    }
    in.close();
    
    
  vtkPolyData* polyData1 = vtkPolyData::New();
    polyData1->SetPoints(cloud1);
      polyData1->Update();
    
    //Delaunay3D
   
 
    vtkDelaunay3D *del=vtkDelaunay3D::New();
    del->SetInput(polyData1);
     del->SetAlpha(0.02);
  



	

	
		
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