void renderScene()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    if (buttonState == 1)
    {
            thetaU += xMousePositionDifference * xAngleInPixels * 0.1;
            thetaV += yMousePositionDifference * yAngleInPixels * 0.1;
    }
    if (buttonState == 2)
    {
            radiusStart += radiusDifference * yAngleInPixels;
    }
    gluLookAt(observerPosition[0], observerPosition[1], observerPosition[2], 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
    light_position[0] = radiusStart * cos(thetaU) * cos(thetaV);
    light_position[1] = radiusStart * sin(thetaV);
    light_position[2] = radiusStart * sin(thetaU) * cos(thetaV);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    Axes();
    Egg(50);


    glFlush();
    glutSwapBuffers();
}