[vtk-developers] Two memory leaks in rendering

[Jonathan Morra]

I have posted a version of this program to the users mailing list before
but got minimal response.  Since I have discovered a different memory leak
in rendering.  These two memory leaks are making my program extremely
unstable, as they get magnified when rendering large objects.  I'm stuck in
my development cycle until these rendering issues get resolved, as a result
I am very motivated to provide any extra comments, data, work that I can to
help fix this problem.

Reproduced below is a test program that causes 2 memory issues in Windows 7
(both x86 and x64).  Please let me know if you can reproduce these problems
or not, and if you can fix them.  Currently I'm hooking in GDCM as well
(although not in this test program), so I cannot easily move to VTK 6 as
GDCM currently does not compile for VTK 6, so if these bugs can be fixed on
the release branch, that would be amazing.

Again, please contact me if you have any questions or would like more
information.

Thanks

#include <QtGui/QApplication>

#include <QMainWindow>

#include <QVTKWidget2.h>

#include <vtkImageViewer2.h>

#include <vtkImageData.h>

#include <vtkPointData.h>

#include <vtkGenericOpenGLRenderWindow.h>

#include <vtkSphereSource.h>

#include <vtkPolyDataMapper.h>

#include <vtkActor.h>

#include <vtkRenderer.h>

#include <vtkRenderWindow.h>

// This program shows 2 separate bugs with rendering.

/**

  First, if you run the program as provided, and either move the mouse
over the image

  or press the mouse, notice that the memory stays constant.  The
first bug involves consuming memory

  on a render command when we're just rendering an image.  In order to
see this, comment in the

  commented out line in the mouseMoveEvent method.  Notice that as you
mouse around the memory now increases.

  The second bug involves rendering after an actor has been added.  If
you comment in the one

  commented out line in mousePressEvent, you now see the memory jump
significantly after each

  mouse press.

    I'm testing these on Qt 4.8.0 x64 Windows VS 2008, VTK pulled from
git release branch, tag

  5.10.0-rc1.  I'm monitoring the memory using the Windows Task Manager.

  */

class MyQVTKWidget2 : public QVTKWidget2 {

    vtkSmartPointer<vtkRenderer> renderer;

public:

    MyQVTKWidget2 (vtkSmartPointer<vtkImageViewer2> imageViewer,
QWidget *parent = 0) : QVTKWidget2(parent) {

        this->imageViewer = imageViewer;

        renderer = vtkSmartPointer<vtkRenderer>::New();

        GetRenderWindow()->AddRenderer(renderer);

    }

    virtual ~MyQVTKWidget2() {

    }

    void mouseMoveEvent(QMouseEvent *) {

        for (int i=0; i<1000; ++i) {

            //imageViewer->Render();

        }

    }

    void mousePressEvent(QMouseEvent *) {

        vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();

        sphereSource->Update();

        for (int i=0; i<1000; ++i) {

            vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();

            mapper->SetInput(sphereSource->GetOutput());

            mapper->Update();

            vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();

            actor->SetMapper(mapper);

            renderer->AddActor(actor);

            //renderer->Render();

            renderer->RemoveActor(actor);

        }

    }

private:

    vtkSmartPointer<vtkImageViewer2> imageViewer;

};

int main(int argc, char *argv[]) {

    QApplication a(argc, argv);

    vtkSmartPointer<vtkImageData> imageData =
vtkSmartPointer<vtkImageData>::New();

    imageData->SetExtent(0, 100, 0, 100, 0, 100);

    imageData->SetOrigin(0, 0, 0);

    imageData->SetSpacing(1, 1, 1);

    imageData->AllocateScalars();

    imageData->GetPointData()->GetScalars()->FillComponent(0, 0);

    vtkSmartPointer<vtkImageViewer2> imageViewer =
vtkSmartPointer<vtkImageViewer2>::New();

    imageViewer->SetInput(imageData);

    MyQVTKWidget2 *widget = new MyQVTKWidget2(imageViewer);

    imageViewer->SetRenderWindow(widget->GetRenderWindow());

    QMainWindow mainWindow;

    mainWindow.setGeometry(200, 200, 300, 300);

    mainWindow.setCentralWidget(widget);

    mainWindow.show();

    return a.exec();

}
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