[vtkusers] Trouble using VTK Widget with QVTK

[andyjk]

I'm still having no luck and suspect this is a bug in VTK, when using
QVTKOpenGLWidget.

The full QT mainwindow.cpp code is pasted below with the various lines that
don't work in comments.
I've tried every combination and nothing worked - how do I report this as a
bug ?

Thanks!

#include "mainwindow.h"
#include "build/ui_mainwindow.h"

#include <vtkVersion.h>
#include "vtkSmartPointer.h"

#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkCellArray.h"
#include "vtkImageDataGeometryFilter.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"
#include "vtkPolyDataCollection.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkTriangleFilter.h"

#include <vtkRendererCollection.h>

#include "vtkContourWidget.h"
#include "vtkOrientedGlyphContourRepresentation.h"
#include "vtkPolygonalSurfacePointPlacer.h"
#include "vtkPolygonalSurfaceContourLineInterpolator.h"

#include <vtkGenericOpenGLRenderWindow.h>
#include <QVTKWidget.h>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

	vtkSmartPointer<vtkPolyData> polyData;

	vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
	sphereSource->SetThetaResolution(40);
	sphereSource->SetPhiResolution(20);
	sphereSource->Update();

	polyData = sphereSource->GetOutput();
	

	// The Dijkistra interpolator will not accept cells that aren't triangles
	vtkSmartPointer<vtkTriangleFilter> triangleFilter =
		vtkSmartPointer<vtkTriangleFilter>::New();
#if VTK_MAJOR_VERSION <= 5
	triangleFilter->SetInput(polyData);
#else
	triangleFilter->SetInputData(polyData);
#endif
	triangleFilter->Update();

	vtkSmartPointer<vtkPolyData> pd = triangleFilter->GetOutput();

	//Create a mapper and actor
	vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputConnection(triangleFilter->GetOutputPort());

	vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
	actor->SetMapper(mapper);
	actor->GetProperty()->SetInterpolationToFlat();

	// Create the render window, renderer and interactor.
	vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();


/////////////////////////////////////////////////////////////////////////////////////////////////////
	// OPTION 1: Use this for a plain non-QT VTK window. The
Polygonalsurfaceinteractor works fine
	//vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New(); 

	// OPTION 2: ....but if we use this instead and set the renderwindow of the
qvtkOpenGL widget to this, the polygonalsurfaceintaeractor does not work
	// although at least the sphere displays. We cannot move the camera though
	// Remember to comment out the interactor->Start() line at the bottom of
the code, or everything freezes with no display!
	//vtkNew<vtkGenericOpenGLRenderWindow> renderWindow; 
	
	vtkSmartPointer<vtkRenderWindow> renderWindow =
ui->widget->GetRenderWindow();

/////////////////////////////////////////////////////////////////////////////////////////////////////

	ui->widget->GetRenderWindow()->AddRenderer(renderer);
	ui->widget->GetRenderWindow()->Render();
	ui->widget->update();


/////////////////////////////////////////////////////////////////////////////////////////////////////
	// OPTION A: If we grab the interactor from the QVTKOpenGL widget, then at
least we can move the camera around, but we cannot use the polygonalsurface
placer
	vtkSmartPointer<vtkRenderWindowInteractor> interactor =
ui->widget->GetInteractor();

	// OPTION B: .....alternatively, if we set a new interactor and try to use
QVTKOpenGL, no interaction is possible.
	// Note We must set a new interactor if we are using the pure non-QT VTK
window (OPTION 1 above)
	//vtkSmartPointer<vtkRenderWindowInteractor> interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();

/////////////////////////////////////////////////////////////////////////////////////////////////////
	
	//interactor->SetRenderWindow(ui->widget->GetRenderWindow());
	

	// Add the actors to the renderer, set the background and size
	renderer->AddActor(actor);
	renderer->SetBackground(.3, .4, .5);
	renderer->ResetCamera();

	// Here comes the contour widget stuff...
	vtkSmartPointer<vtkContourWidget> contourWidget =
vtkSmartPointer<vtkContourWidget>::New();
	contourWidget->SetInteractor(interactor);
	
	vtkSmartPointer<vtkOrientedGlyphContourRepresentation> rep =
		vtkOrientedGlyphContourRepresentation::SafeDownCast(
			contourWidget->GetRepresentation());
	rep->GetLinesProperty()->SetColor(1, 0.2, 0);
	rep->GetLinesProperty()->SetLineWidth(3.0);
	
	vtkSmartPointer<vtkPolygonalSurfacePointPlacer> pointPlacer =
		vtkSmartPointer<vtkPolygonalSurfacePointPlacer>::New();
	pointPlacer->AddProp(actor);
	pointPlacer->GetPolys()->AddItem(pd);
	rep->SetPointPlacer(pointPlacer);


	vtkSmartPointer<vtkPolygonalSurfaceContourLineInterpolator> interpolator =
		vtkSmartPointer<vtkPolygonalSurfaceContourLineInterpolator>::New();
	interpolator->GetPolys()->AddItem(pd);
	rep->SetLineInterpolator(interpolator);

	//renderWindow->Render();
	
	//interactor->Initialize();

	contourWidget->EnabledOn();
	
	

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	// OPTION 1: We have to uncomment this for the pure VTK version
	// OPTION 2: ....But comment it out if using the QVTKOpenGL Widget,
otherwise everything freezes with no rendering
	//interactor->Start();

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}

MainWindow::~MainWindow()
{
    delete ui;
}




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