vtkWidget position on multiple renderers - vtk

Question

I am running into a relative simple problem for days, and I didn't find any solving: I have a vtkRenderWindow where I spread up 4 renderers, but on runtime I hide 3 of them, so I could have 1 or 4 renderers at the time ...
On renderer 1 I intend to put a vtkSliderWidget ... to achieve that, I wrote:
vtkSliderRepresentation2D* pSliderRep = vtkSliderRepresentation2D::New();
......
......
pSliderRep->GetPoint1Coordinate()->SetCoordinateSystemToNormalizedViewport();
pSliderRep->GetPoint1Coordinate()->SetValue(0.1, 0.1);
pSliderRep->GetPoint2Coordinate()->SetCoordinateSystemToNormalizedViewport();
pSliderRep->GetPoint2Coordinate()->SetValue(0.9, 0.1);
m_pSlider->SetInteractor(m_pInteractor);
m_pSlider->SetRepresentation(pSliderRep);
where m_pSlider is a vtkSliderWidget object ...
the problem become where I have 4 renderers:
Renderer 1 Renderer 2
Renderer 3 Renderer 4
in this stage, the widget I found over renderer 3, not over renderer 1 where is belong ... why ?
Is there something that I am doing wrong ? I dig in for this issue for days !! Can you help me ?
Later edit:
I made a simple test using this test project:
int main(int, char *[])
{
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkRenderer* renderer[4];
// Define viewport ranges
double xmins[4] = {0, .5, 0, .5};
double xmaxs[4] = {0.5, 1, 0.5, 1};
double ymins[4] = {0, 0, .5, .5};
double ymaxs[4] = {0.5, 0.5, 1, 1};
for(unsigned i = 0; i < 4; i++)
{
renderer[i] = vtkRenderer::New();
renderWindow->AddRenderer(renderer[i]);
CString sTemp;
sTemp.Format("%.1f, %.1f, %.1f, %.1f\n", xmins[i], ymins[i], xmaxs[i], ymaxs[i]);
renderer[i]->SetViewport(xmins[i], ymins[i], xmaxs[i], ymaxs[i]);
// Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5);
sphereSource->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
renderer[i]->AddActor(actor);
renderer[i]->ResetCamera();
renderWindow->Render();
renderWindow->SetWindowName(_T("Multiple ViewPorts"));
}
vtkSliderRepresentation2D* pSliderRep = vtkSliderRepresentation2D::New();
pSliderRep->SetMinimumValue(3.0);
pSliderRep->SetMaximumValue(20.0);
pSliderRep->SetPlaceFactor(1);
pSliderRep->GetSliderProperty()->SetColor(0.65, 0.75, 0.90);
pSliderRep->GetTitleProperty()->SetColor(1, 0, 0);
pSliderRep->SetLabelFormat(_T("%.2g"));
pSliderRep->GetLabelProperty()->SetColor(1, 0, 0);
pSliderRep->GetSelectedProperty()->SetColor(0, 1, 0);
pSliderRep->GetTubeProperty()->SetColor(0.36, 0.5, 0.66);
pSliderRep->GetTubeProperty()->SetDisplayLocationToForeground();
pSliderRep->GetCapProperty()->SetColor(0.36, 0.5, 0.66);
pSliderRep->SetEndCapLength(0);
pSliderRep->SetEndCapWidth(0.025);
pSliderRep->SetSliderWidth(0.025);
pSliderRep->SetSliderLength(0.045);
pSliderRep->SetHandleSize(6);
pSliderRep->SetTubeWidth(0.032);
pSliderRep->GetPoint1Coordinate()->SetCoordinateSystemToNormalizedDisplay();
pSliderRep->GetPoint1Coordinate()->SetValue(0.01, 0.99);
pSliderRep->GetPoint2Coordinate()->SetCoordinateSystemToNormalizedDisplay();
pSliderRep->GetPoint2Coordinate()->SetValue(0.99, 0.99);
vtkSliderWidget* pSlider = vtkSliderWidget::New();
pSlider->SetInteractor(renderWindowInteractor);
pSlider->SetCurrentRenderer(renderer[0]);
pSlider->SetRepresentation(pSliderRep);
pSlider->EnabledOn();
pSlider->SetDefaultRenderer(renderer[0]);
pSlider->SetAnimationModeToAnimate();
renderWindowInteractor->Start();
pSliderRep->Delete();
pSlider->Delete();
for(unsigned i = 0; i < 4; i++)
renderer[i]->Delete();
return EXIT_SUCCESS;
}
But I see no slider ... what I have done wrong ?
[New data] In fact, the problem is reduced on setting up the slider on other renderer than renderer 0:
int main(int, char *[])
{
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkRenderer* renderer[4];
// Define viewport ranges
double xmins[4] = {0, .5, 0, .5};
double xmaxs[4] = {0.5, 1, 0.5, 1};
double ymins[4] = {0, 0, .5, .5};
double ymaxs[4] = {0.5, 0.5, 1, 1};
for(unsigned i = 0; i < 4; i++)
{
renderer[i] = vtkRenderer::New();
renderWindow->AddRenderer(renderer[i]);
CString sTemp;
sTemp.Format("%.1f, %.1f, %.1f, %.1f\n", xmins[i], ymins[i], xmaxs[i], ymaxs[i]);
renderer[i]->SetViewport(xmins[i], ymins[i], xmaxs[i], ymaxs[i]);
// Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5);
sphereSource->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
renderer[i]->AddActor(actor);
renderer[i]->ResetCamera();
renderWindow->Render();
renderWindow->SetWindowName(_T("Multiple ViewPorts"));
}
vtkSliderRepresentation2D* pSliderRep = vtkSliderRepresentation2D::New();
pSliderRep->SetMinimumValue(3.0);
pSliderRep->SetMaximumValue(20.0);
pSliderRep->GetPoint1Coordinate()->SetCoordinateSystemToNormalizedViewport();
pSliderRep->GetPoint1Coordinate()->SetValue(0.1, 0.9);
pSliderRep->GetPoint2Coordinate()->SetCoordinateSystemToNormalizedViewport();
pSliderRep->GetPoint2Coordinate()->SetValue(0.9, 0.9);
vtkSliderWidget* pSlider = vtkSliderWidget::New();
pSlider->SetInteractor(renderWindowInteractor);
pSlider->SetCurrentRenderer(renderer[1]); // <-- not working !!!
pSlider->SetDefaultRenderer(renderer[1]); // <-- not working !!!
pSlider->SetAnimationModeToAnimate();
pSlider->SetRepresentation(pSliderRep);
pSlider->EnabledOn();
pSliderRep->Modified();
renderWindowInteractor->Start();
pSliderRep->Delete();
pSlider->Delete();
for(int i = 0; i < 4; i++)
renderer[i]->Delete();
return EXIT_SUCCESS;
}
the question is, how can I show the slider on renderer 1 (or 2, or 3), but on renderer 0 ?
Might be something simple ...

Answer 1

After applying the representation and all the stuff call CreateDefaultRepresentation() - this should change a lot.
pSlider->SetRepresentation(pSliderRep);
pSlider->EnabledOn();
pSlider->CreateDefaultRepresentation();