VTK 6.1和Qt 5.3：QVTKWidget中的3D對象具有不透明性

Question

基礎： Debian 7.5 Wheezy 64位-從Online Installer安裝的Qt 5.3； VTK 6.1成功編譯並通過Qt支持手動安裝。

結果： 3D球體顯示在3D QVTK窗口中。 乍一看，看起來不錯，但是當球體旋轉時，球體的多個面板和部分將變為透明。

描述：

為Qt嘗試了VTK的基本官方示例：

在main.cpp中：

#include <QApplication>

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL);
VTK_MODULE_INIT(vtkInteractionStyle);

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkImageViewer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.h>
#include <QVTKWidget.h>

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

    QVTKWidget widget;
      widget.resize(256,256);

      // Setup sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
          vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();
      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
          vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> sphereActor =
          vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);

      // Setup window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
          vtkSmartPointer<vtkRenderWindow>::New();

      // Setup renderer
      vtkSmartPointer<vtkRenderer> renderer =
          vtkSmartPointer<vtkRenderer>::New();
      renderWindow->AddRenderer(renderer);

      renderer->AddActor(sphereActor);
      renderer->ResetCamera();

      widget.SetRenderWindow(renderWindow);
      widget.show();

    return a.exec();
}

重要的是，RenderWindowUISingleInheritance給出了相同的結果。

---

解

最終代碼如下：

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL);
VTK_MODULE_INIT(vtkInteractionStyle);

#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkImageViewer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.h>
#include <QVTKWidget.h>
#include <vtkProperty.h>

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

    QVTKWidget widget;
      widget.resize(256,256);

      // Setup sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
          vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();
      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
          vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> sphereActor =
          vtkSmartPointer<vtkActor>::New();
      sphereActor->GetProperty()->SetFrontfaceCulling(true);
      sphereActor->SetMapper(sphereMapper);

      // Setup window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
          vtkSmartPointer<vtkRenderWindow>::New();

      // Setup renderer
      vtkSmartPointer<vtkRenderer> renderer =
          vtkSmartPointer<vtkRenderer>::New();
      renderWindow->AddRenderer(renderer);

      renderer->AddActor(sphereActor);
      renderer->ResetCamera();

      widget.SetRenderWindow(renderWindow);
      widget.show();

    return a.exec();
}

請注意以下內容：

#include <vtkProperty.h>

和

sphereActor->GetProperty()->SetFrontfaceCulling(true);

Answer 1

看起來Frontface剔除默認情況下處於關閉狀態。 嘗試添加sphereActor->GetProperty()->FrontfaceCullingOn();

Answer 2

似乎可以解決此透明性問題的另一個選項是使用QVTKWidget2而不是QVTKWidget。