Qt with OpenGL problems

[qmor]

Hello everyone. I'm trying to use Qq with OpenGL. I have some c++ classes what describes Scene, objects, textures, etc. I've create class MainWindow from QGLWidget, and overdrive it's methods.

@
#include "MainWindow.h"
#include <iostream>
#include <GL/gl.h>
using namespace std;
MainWindow::MainWindow(QWidget *parent) : QGLWidget(parent)
{
Scene=NULL;

setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
}
void MainWindow::setScene(scene *sScene)

{
setFormat(QGLFormat(QGL::DoubleBuffer | QGL::DepthBuffer));
Scene=sScene;
}

void MainWindow::initializeGL()
{
;
GLfloat lightpos[]={1.0,1.0,-3.0,1.0};
GLfloat lightcolor[]={1.0,1.0,1.0,1.0};
GLfloat mat_specular[] ={1.0,1.0,1.0,1.0};
cout << "GL init start" << endl;
glClearColor(0.0,0.0,0.0,1.0);
glShadeModel(GL_SMOOTH);

glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glEnable(GL_COLOR_MATERIAL);
glDepthFunc(GL_LEQUAL);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);
glMaterialf(GL_FRONT,GL_SHININESS,128.0);
glMaterialfv(GL_BACK,GL_SPECULAR,mat_specular);
glMaterialf(GL_BACK,GL_SHININESS,128.0);

glLightfv(GL_LIGHT0,GL_POSITION,lightpos);
glLightfv(GL_LIGHT0,GL_DIFFUSE,lightcolor);

glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,GL_TRUE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_CULL_FACE);
glEnable(GL_MULTISAMPLE);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);

cout << "GL init end" << endl;

}

void MainWindow::resizeGL(int width, int height)
{
glViewport(0,0,(GLsizei) width, (GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0,1.0,-1.0,1.0,1.5,20000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

void MainWindow::paintGL()
{
if (Scene!=NULL)
{
cout << "Drawing" << endl;

Scene->processObjects();
Scene->Draw(); //this code is drawing all scene's objects

}
else
{
cout << "Scene is NULL" << endl;
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);//Очистка цветового буфера и буфера глубины
glLoadIdentity();
}
}

@

Now i'm trying to create scene and Application and have only the blank screen

@
int main(int argc, char **argv)
{

QApplication app(argc,argv);
if(!QGLFormat::hasOpenGL())
{
cerr << "This system has no OpenGL support" << endl;
return 1;
}

Vector3D<GLfloat> Rotation(0.1,0.1,0.0);

scene Scene;

MainWindow mainWindow;
mainWindow.setScene(&Scene);

Model3D Ico((char *)"ccc1.obj");//while loading object textures loading too
Ico.setRotationSpeed(Rotation);
Rotation.set(0.0,-10.0,0.0);
Scene.addObject(&Ico);
Light light(0.0,0.0,4.0,1.0,0.7,0.9);
Scene.setLight(light);
Scene.enableAA(true);

mainWindow.resize(800,800);
mainWindow.show();

return app.exec();
}
@
What i'm doind wrong?