[vtkusers] offscreen rendering vtkGenericopenglRenderWindow

[Elhassan Abdou]

Hi,

I am trying to do offscreen rendering of a scene. When I captured the
framebuffer and add to Qopenglvtkwidget using image actor the image was
split into two halves as attached in the image attached.

Can you please help me to know how to solve this issue to make the captured
framebuffer looks like the scene shown

VTKWidget1->GetRenderWindow()->AddRenderer(m_rendererLeft);
VTKWidget2->GetRenderWindow()->AddRenderer(m_rendererRight);
VTKWidget1->show();
VTKWidget2->show();
m_SkinMapperLeft->SetInputConnection(m_SkinNormals->GetOutputPort());
m_SkinMapperLeft->ScalarVisibilityOff();
//m_SkinMapperRight->SetInputConnection(m_SkinNormals->GetOutputPort());
//m_SkinMapperRight->ScalarVisibilityOff();

m_SkinActorLeft->SetMapper(m_SkinMapperLeft);
//m_SkinActorRight->SetMapper(m_SkinMapperRight);

m_outlineData->SetInputConnection(m_Volume16Reader->GetOutputPort());

m_mapOutlineLeft->SetInputConnection(m_outlineData->GetOutputPort());
m_outlineActorLeft->SetMapper(m_mapOutlineLeft);
m_outlineActorLeft->GetProperty()->SetColor(0, 0, 0);

m_CameraLeft->SetViewUp(0, 0, -1);
m_CameraLeft->SetPosition(0, 1, 0);
m_CameraLeft->SetFocalPoint(0, 0, 0);
m_CameraLeft->ComputeViewPlaneNormal();
m_CameraLeft->Azimuth(30.0);
m_CameraLeft->Elevation(30.0);

m_rendererLeft->AddActor(m_outlineActorLeft);
m_rendererLeft->AddActor(m_SkinActorLeft);
m_rendererLeft->SetActiveCamera(m_CameraLeft);
m_rendererLeft->ResetCamera();
m_rendererRight->SetActiveCamera(m_CameraLeft);
m_rendererRight->ResetCamera();
m_CameraLeft->Dolly(1.5);

// Set a background color for the renderer and set the size of the
// render window (expressed in pixels).
m_rendererLeft->SetBackground(.2, .3, .4);
m_rendererRight->SetBackground(.2, .3, .4);
//m_rendererRight->SetActiveCamera(m_CameraLeft);
//m_rendererRight->ResetCamera();

//Creates an Empty image
/*m_LeftRenderWindow->SetUseOffScreenBuffers(true);
m_rendererLeft->Render();
int* size = m_LeftRenderWindow->GetSize();
vtkNew<vtkImageData> image;
image->SetDimensions(size[0] - 1, size[1] - 1, 1);
image->AllocateScalars(VTK_UNSIGNED_CHAR, 3);
m_LeftRenderWindow->GetPixelData(0, 0, size[0] - 1, size[1] - 1,0,
vtkArrayDownCast<vtkUnsignedCharArray>(image->GetPointData()->GetScalars()),0);*/
m_LeftRenderWindow->SetUseOffScreenBuffers(false);
m_LeftRenderWindow->Render();
m_LeftRenderWindow->SetUseOffScreenBuffers(true);
m_LeftRenderWindow->Render();
int* size = m_LeftRenderWindow->GetSize();
vtkNew<vtkImageData> image;
image->SetDimensions(size[0] - 1, size[1] - 1, 1);
image->AllocateScalars(VTK_UNSIGNED_CHAR, 3);
m_LeftRenderWindow->GetPixelData(0, 0, size[0] - 1, size[1] - 1, 0,
vtkArrayDownCast<vtkUnsignedCharArray>(image->GetPointData()->GetScalars()),
0);
m_LeftRenderWindow->SetUseOffScreenBuffers(false);
vtkNew<vtkImageActor> imageActor;
imageActor->GetMapper()->SetInputData(image);
m_rendererRight->AddActor(imageActor);
m_rendererRight->Render();
[image: Inline image 1]

Best regards
Elhassan
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