[vtkusers] How to draw lines between two datasets using VTK

[dev]

Hi David thank you for your answer.. I have done all what you said:

Put the points (source and target ) in a vtkObject ... and then trace the
lines between them. here is the code that I write:

vtkPolyData* mesh1 = LoadData(filename_source);
	vtkPolyData* mesh2 = LoadData(filename_target);
	int numb_lines=10;

	//Get the points source and target

	float* pointArray_src =  (float*)mesh1->GetPoints()->GetVoidPointer(0);
	float* pointArray_tgt =  (float*)mesh2->GetPoints()->GetVoidPointer(0);
	
	// Create a vtkPoints object and store the points in it: a list of
pointArray_src and pointArray_src
   

 vtkSmartPointer<vtkPoints> pts =
    vtkSmartPointer<vtkPoints>::New();

	 for ( int i=0 ; i<mesh1->GetNumberOfPoints() ; i++ )
		
pts->InsertNextPoint(pointArray_src[3*i],pointArray_src[3*i+1],pointArray_src[3*i+2]);

     for ( int i=0 ; i<mesh2->GetNumberOfPoints() ; i++ )
        
pts->InsertNextPoint(pointArray_tgt[3*i],pointArray_tgt[3*i+1],pointArray_tgt[3*i+2]);

//

	   // Create the lines
    vtkSmartPointer<vtkCellArray> lines =
    vtkSmartPointer<vtkCellArray>::New();   
	 
	
	 //for ( int i=0 ; i < numb_lines ; i++ )
	 //{

     vtkSmartPointer<vtkLine> line =
     vtkSmartPointer<vtkLine>::New();
	 line->GetPointIds()->SetId(0,1); //the second 0 is the index of the Origin
in the vtkPoints
     line->GetPointIds()->SetId(1, 1 + mesh1->GetNumberOfPoints()); //the
second 1 is the index of P0 in the vtkPoints
	 lines->InsertNextCell(line);

     //}

	 // Create a polydata to store everything in
    vtkSmartPointer<vtkPolyData> linesPolyData =
    vtkSmartPointer<vtkPolyData>::New();

	// Add the points to the dataset
    linesPolyData->SetPoints(pts);
 
    // Add the lines to the dataset
    linesPolyData->SetLines(lines);

	  std::cout << "There are " << linesPolyData->GetNumberOfLines() << "
lines." << std::endl;

*That works great, and I can visualize the lines, but how to display the
cloud points : pointArray_src and pointArray_tgt and lines in the same time
at the same windows to find a result like this (in the insterted image)??*
http://vtk.1045678.n5.nabble.com/file/n5010176/2011-11-21_115155.jpg 

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