[vtkusers] Connect a vtkCutter to an imageWriter

[TINGAUD Frederic]

Hi,

 

So, after some search, the only solution that I found, in order to do it, is to create a temporary offscreen vtkRenderWindow, with only one actor, and a camera placed to face the actor. I then use a vtkWindowToImageFilter to pass it to the writer.

It seems quite intricate, but at least, it works.

If anybody as a solution that doesn't involve camera position calculation, I am still interested.

 

Thanks,

 

Frederic

 

De : TINGAUD Frederic 
Envoyé : vendredi 15 mars 2013 14:47
À : vtkusers at vtk.org
Objet : Connect a vtkCutter to an imageWriter

 

Hi all,

 

I have a structured grid, that I cut using a vtkCutter. This part is working well, but I would now like to connect this vtkCutter to a vtkPNGWriter or any image writer that would allow me to put the resulting plane into an image in memory, in order to use it elsewhere. Is it possible? If yes, what should I use to connect them?

 

I join a minimal test case of what I am doing to obtain the vtkCutter I would like to extract, in case it is of some interest (sorry it is in Java...).

 

Regards,

 

Frederic

 

 

public static void main(String[] args) throws InterruptedException, InvocationTargetException {

    final vtkRenderWindowPanel rwp = new vtkRenderWindowPanel();

 

    vtkPoints pts = new vtkPoints();

    for(int i = 0; i < 3; ++i) {

        for(int j = 0; j < 3; ++j) {

            for(int k = 0; k < 3; ++k) {

                pts.InsertNextPoint(k, j, i);

            }

        }

    }

 

    Random rand = new Random();

    vtkDoubleArray scalars = new vtkDoubleArray();

    for(int i = 0; i < 27; ++i) {

        scalars.InsertNextValue(rand.nextInt(100));

    }

 

    vtkStructuredGrid grid = new vtkStructuredGrid();

    grid.SetDimensions(3, 3, 3);

    grid.SetPoints(pts);

    grid.GetPointData().SetScalars(scalars);

 

    vtkDataSetMapper mapper = new vtkDataSetMapper();

    mapper.SetInputData(grid);

    mapper.SetScalarRange(scalars.GetRange()[0], scalars.GetRange()[1]);

 

    vtkPlane plane = new vtkPlane();

    plane.SetNormal(new double[] { 0, 1, 0 });

    vtkCutter cutter = new vtkCutter();

    cutter.SetInputData(grid);

    cutter.SetCutFunction(plane);

    cutter.SetValue(0, 0.5);

 

    vtkDataSetMapper cutterMapper = new vtkDataSetMapper();

    cutterMapper.SetInputConnection(cutter.GetOutputPort());

    cutterMapper.SetScalarRange(scalars.GetRange()[0], scalars.GetRange()[1]);

 

    final vtkActor gridAct = new vtkActor();

    gridAct.SetMapper(mapper);

    gridAct.GetProperty().SetOpacity(0.2);

 

    final vtkActor cutActor = new vtkActor();

    cutActor.SetMapper(cutterMapper);

 

    EventQueue.invokeAndWait(new Runnable() {

        @Override

        public void run() {

            JFrame frame = new JFrame();

            vtkRenderer r = rwp.GetRenderer();

            r.AddActor(gridAct);

            r.AddActor(cutActor);

            frame.setLayout(new BorderLayout());

            frame.add(rwp, BorderLayout.CENTER);

            frame.setVisible(true);

            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        }

    });

}

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