[vtkusers] Like a "binary file"

[Guiu]

-> I have this class in vtk to draw a square and I would like as result a
binary file, I mean, get as output a matrix with 1 where is a square and 0
where is not (in a .dat file if it is possible). Thaks to everybody.

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   vtkCubeSource *square = vtkCubeSource::New();
    square -> SetXLength(10);
    square -> SetYLength(5);

    // create a mapper
    vtkPolyDataMapper *circleMapper = vtkPolyDataMapper::New();
    circleMapper -> SetInput(circle->GetOutput());

    //create an actor to represent the points
    vtkActor *circleActor = vtkActor::New();
    circleActor -> SetMapper( circleMapper );
    circleActor -> GetProperty() -> SetColor(0, 1, 0);

    // Create the Renderer and assign actors to it
    vtkRenderer *circleRenderer = vtkRenderer::New();
    circleRenderer -> AddActor( circleActor );
    circleRenderer -> SetBackground( .1, .1, .1);

    //create the render window which will show up on the screen
    vtkQtRenderWindow *circleRenderWindow = new vtkQtRenderWindow(parent);
    circleRenderWindow -> AddRenderer( circleRenderer );
    circleRenderWindow -> setGeometry(300, 10, 400, 400);
    circleRenderWindow -> show();
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