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    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    vertex_buffer.bind();
    index_buffer->bind();
    glVertexPointer(3,GL_FLOAT,sizeof(Point),0);
    glNormalPointer(GL_FLOAT,sizeof(Point),(void*)12);
    glTexCoordPointer(2,GL_FLOAT,sizeof(Point),(void*)24);

    glDrawElements(GL_TRIANGLES,faces_points_indices.count(),GLPointIdxType,0);
    index_buffer->release();
    vertex_buffer.release();

    glDisableClientState(GL_NORMAL_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisableClientState(GL_VERTEX_ARRAY);
    glPopMatrix();

    if (vertex_buffer.create())
    {
        vertex_buffer.bind();
        vertex_buffer.setUsagePattern(QGLBuffer::StaticDraw);
        vertex_buffer.release();
    }
    else qDebug() << "Couldn't create vertex_buffer";

    index_buffer = new QGLBuffer(QGLBuffer::IndexBuffer);
    if (index_buffer&&(index_buffer->create()))
    {
        index_buffer->bind();
        index_buffer->setUsagePattern(QGLBuffer::StaticDraw);
        index_buffer->release();
    }
    else qDebug() << "Couldn't create index_buffer";

typedef struct {
        QVector3D vertex;
        QVector3D normal;
        QVector2D texcoord;
    } Point;

    typedef unsigned int PointIdxType;
    const GLuint GLPointIdxType = GL_UNSIGNED_INT;

    typedef unsigned int FaceIdxType;

    QVector<QVector3D> vertices;
    QVector<QVector3D> face_normal;
    QVector<QVector2D> texcoords;
    QVector<Point> points;
    QHash<QString,PointIdxType> string_to_point_index;
    QVector<PointIdxType> faces_points_indices;
    QVector<QVector<FaceIdxType> > point_faces;

    QGLBuffer vertex_buffer;
    QGLBuffer *index_buffer;