[vtkusers] Why doesn't the intersection of the lines of a vtkCursor2D not set at the focal point?

[Xiaofeng Z]

Hi vtkUsers,

The following is a program that place a vtkSphere and a vtkCursor2D in a rendering window.  My question is why the cursor 2d does not pass the center of the sphere, see attached image.

int _tmain(int argc, _TCHAR* argv[])
{
    // create sphere geometry
    vtkSphereSource *sphere = vtkSphereSource::New();
    sphere->SetCenter(0.0, 0.0, 0.0);
    sphere->SetRadius(1.0);
    sphere->SetThetaResolution(18);
    sphere->SetPhiResolution(18);

    // map to graphics library
    vtkPolyDataMapper *map = vtkPolyDataMapper::New();
    map->SetInput(sphere->GetOutput());

    // actor coordinates geometry, properties, transformation
    vtkActor *actor = vtkActor::New();
    actor->SetMapper(map);
    actor->GetProperty()->SetColor(0,0,1); // sphere color blue

    // renderers and render window
    vtkRenderer *renA = vtkRenderer::New();
    renA->SetViewport(0.0, 0.0, 1.0, 1.0);
    vtkRenderWindow* win = vtkRenderWindow::New();
    win->SetSize(300,300);
    win->AddRenderer(renA);

    // an interactor
    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(win);

    renA->SetBackground(1,1,1); // Background color white

    renA->AddActor(actor);

    // add a 2D cursor to each Renderer
    vtkCursor2D* cursor = vtkCursor2D::New();
    cursor->SetTranslationMode(1);
    cursor->SetWrap(1);
    cursor->SetModelBounds(-0.5, 0.5, -0.5, 0.5, 0.0, 0.0);
    cursor->SetFocalPoint(0.0, 0.0, 0.0);
    cursor->AllOff();
    cursor->AxesOn();

    vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
    mapper->SetInput(cursor->GetOutput());
    actor = vtkActor::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(1.0, 0.0, 0.0);

    renA->AddActor(actor);

    // render an image (lights and cameras are created automatically)
    win->Render();

    iren->Start();

    return 0;
}


Xiaofeng Z



 		 	   		  
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