[vtkusers] Strange rendering with multiple renderers sharing a camera

[CharlesB]

Hello,

I still have no clue on how to solve this problem, so I submitted a report
here : https://gitlab.kitware.com/vtk/vtk/issues/17107

If anyone can give a sight on it to help, I would be grateful!

Charles

2017-08-16 14:57 GMT+02:00 CharlesB <chbrossotaf at gmail.com>:

> Hello,
>
> I have two renderers in a render window, because I need overlay actors to
> be always front. They share the same camera, in order to be moved together
> with user interaction.
> The issue is that the actor is only partially rendered when user moves the
> camera in the scene, as if the front and the back of it was disappearing.
>
> I see this with VTK 7.1 and 8.0.
>
> Is there something special to do to avoid this? Or did I find a bug?
>
> [image: Images intégrées 1]
>
> #include <vtkSmartPointer.h>
> #include <vtkPolyDataMapper.h>
> #include <vtkActor.h>
> #include <vtkRenderWindow.h>
> #include <vtkCamera.h>
> #include <vtkRenderer.h>
> #include <vtkRenderWindowInteractor.h>
> #include <vtkPolyData.h>
> #include <vtkPlaneSource.h>
> #include <vtkInteractorStyleTrackballCamera.h>
>
> int main(int, char*[])
> {
>     auto plane_source = vtkSmartPointer<vtkPlaneSource>::New();
>
>     auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
>     mapper->SetInputConnection(plane_source->GetOutputPort());
>
>     auto actor = vtkSmartPointer<vtkActor>::New();
>     actor->SetMapper(mapper);
>
>     auto renderer = vtkSmartPointer<vtkRenderer>::New();
>     auto overlay_renderer = vtkSmartPointer<vtkRenderer>::New();
>     renderer->SetLayer(0);
>     overlay_renderer->SetLayer(1);
>     auto render_window = vtkSmartPointer<vtkRenderWindow>::New();
>     render_window->SetNumberOfLayers(2);
>     render_window->AddRenderer(renderer);
>     render_window->AddRenderer(overlay_renderer);
>     auto camera = vtkSmartPointer<vtkCamera>::New();
>     renderer->SetActiveCamera(camera);
>     overlay_renderer->SetActiveCamera(camera);
>
>     renderer->AddActor(actor);
>     renderer->ResetCamera();
>
>     auto render_window_interactor = vtkSmartPointer<
> vtkRenderWindowInteractor>::New();
>     auto trackball_style = vtkSmartPointer<vtkInteractorStyleTrackballCam
> era>::New();
>
>     render_window_interactor->SetRenderWindow(render_window);
>     render_window_interactor->SetInteractorStyle(trackball_style);
>
>     render_window->Render();
>     render_window_interactor->Start();
>
>     return EXIT_SUCCESS;
> }
>
>
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