thank you for repling

i want one scene

keep subclassing QWidget, and set the central widget with your OgreWidget instance.
it dos not work

i make the definition of my ogrewidget class in file
ogrewidget.h
Qt Code: 
  1. class OgreWidget : public QWidget
  2. {
  3.     Q_OBJECT
  4.  
  5. public:
  6.     OgreWidget(QWidget *parent = 0);
  7.     ~OgreWidget();
  8.  
  9.  
  10. protected:
  11. 	//virtual void keyPressEvent(QKeyEvent *e);
  12.    // virtual void moveEvent(QMoveEvent *e);
  13. 	void moveEvent ( QMoveEvent * e );
  14.     virtual void paintEvent(QPaintEvent *e);
  15.       virtual void showEvent(QShowEvent *e);
  16.  
  17. 	virtual  void mousePressEvent(QMouseEvent *e/*vent*/);
  18. 	virtual void  Read_C3D_Data();
  19. 	virtual void read_c3d();
  20. 	//void  add_camera(const Ogre::Vector3 &pos);
  21.  
  22.  
  23. private:
  24.     void initOgreSystem();
  25. 	void setupNLoadResources();
  26. 	void createScene();
  27. .
  28. .
  29. .
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and i wrote the code of each function in ogrewidget.cpp

in another file interface.h i define my class mainwindow
Qt Code: 
  1. class MyInterface : public QMainWindow
  2. {
  3. 	Q_OBJECT
  4.  
  5. public:
  6. 	QWidget *centralwidget;
  7.     QDockWidget *dockWidget_2;
  8.    QWidget *dockWidgetContents_5;
  9.     QToolBox *toolBox_5;
  10.     QWidget *page_13;
  11.     QToolButton *toolButton_13;
  12.     QToolButton *toolButton_14;
  13.     QToolButton *toolButton_15;
  14.     QFrame *line;
  15.     QToolButton *toolButton_16;
  16.     QGroupBox *groupBox_8;
  17.     QDoubleSpinBox *doubleSpinBox_4;
  18.     QLabel *label_4;
  19.     QLabel *label_5;
  20.     QDoubleSpinBox *doubleSpinBox_5;
  21.     QDoubleSpinBox *doubleSpinBox_6;
  22.     QLabel *label_6;
  23.     QWidget *page_14;
  24.     QToolButton *toolButton_17;
  25.     QFrame *line_2;
  26.     QToolButton *toolButton_18;
  27.     QToolButton *toolButton_19;
  28.     QGroupBox *groupBox_6;
  29.     QDoubleSpinBox *doubleSpinBox;
  30.     QLabel *label;
  31.     QLabel *label_2;
  32.     QDoubleSpinBox *doubleSpinBox_2;
  33.     QDoubleSpinBox *doubleSpinBox_3;
  34.     QLabel *label_3;
  35.     QToolButton *toolButton_20;
  36.     QGroupBox *groupBox_7;
  37.     QWidget *page_15;
  38.     QMdiArea *mdiArea;
  39.     QWidget *subwindow
  40.     QStatusBar *statusbar;
  41.     QDockWidget *dockWidget_5;
  42.     QWidget *dockWidgetContents_8;
  43.     QListView *listView;
  44.     QScrollArea *scrollArea;
  45.     QWidget *scrollAreaWidgetContents;
  46.  
  47.    	MyInterface(QMainWindow* parent = 0);
  48.  
  49. };
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in my file .cpp
Qt Code: 
  1. MyInterface::MyInterface(QMainWindow *parent )
  2. 	 : QMainWindow (parent)
  3.  
  4.     {
  5.  
  6. 	QWidget *centralwidget;
  7.  
  8.    centralwidget = new QWidget(this);
  9.         centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
  10.  
  11.  
  12.         setObjectName(QString::fromUtf8("MainWindow"));
  13. 	    resize(833, 411);
  14. 		setCentralWidget(centralwidget);
  15. 		 setWindowTitle(QApplication::translate("MainWindow", "MainWindow", 0, QApplication::UnicodeUTF8));
  16.  
  17. 		 page_13 = new QWidget();
  18.         page_13->setObjectName(QString::fromUtf8("page_13"));
  19.         page_13->setGeometry(QRect(0, 0, 98, 28));
  20.  
  21. 		.
  22. .
  23. .
  24. .
  25. [U]this->setCentralWidget(new OgreWidget(this));[/U]
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but dos not work