void Header::paintEvent(QPaintEvent *e)
{
    if (!count()) return;

    QPainter painter(viewport());
    QRect currentSectionRect;
    const int height = viewport()->height();
    for (int i = 0; i != model()->columnCount(); ++i) {
        painter.save();
        currentSectionRect.setRect(sectionViewportPosition(i), 0, sectionSize(i), height);

        QStyleOptionHeader opt;
        initStyleOption(&opt);

        opt.rect = currentSectionRect;
        opt.section = i;
        style()->drawControl(QStyle::CE_HeaderSection, &opt, &painter, this);


        QString str = model()->headerData(i, Qt::Horizontal, Qt::DisplayRole).toString();

        QTextDocument td;
        td.setHtml(str);
        QRectF lr = layoutRect(td, currentSectionRect);
        painter.translate(lr.topLeft());
        painter.setClipRect(lr.translated(-lr.x(), -lr.y()));
        td.drawContents(&painter, QRectF());

        painter.restore();
    }
}

void
lib3ds_file_bounding_box(Lib3dsFile *file, Lib3dsVector min, Lib3dsVector max)
{
  Lib3dsBool init=LIB3DS_FALSE;

  {
    Lib3dsVector lmin, lmax;
    Lib3dsMesh *p=file->meshes;

    if (!init && p) {
      init = LIB3DS_TRUE;
      lib3ds_mesh_bounding_box(p, min, max);
      p = p->next;  
    }
    while (p) {
      lib3ds_mesh_bounding_box(p, lmin, lmax);
      lib3ds_vector_min(min, lmin);
      lib3ds_vector_max(max, lmax);
      p=p->next;
    }
  }
  {
    Lib3dsCamera *p=file->cameras;
    if (!init && p) {
      init = LIB3DS_TRUE;
      lib3ds_vector_copy(min, p->position);
      lib3ds_vector_copy(max, p->position);
    }

    while (p) {
      lib3ds_vector_min(min, p->position);
      lib3ds_vector_max(max, p->position);
      lib3ds_vector_min(min, p->target);
      lib3ds_vector_max(max, p->target);
      p=p->next;
    }
  }
  {
    Lib3dsLight *p=file->lights;
    if (!init && p) {
      init = LIB3DS_TRUE;
      lib3ds_vector_copy(min, p->position);
      lib3ds_vector_copy(max, p->position);
    }

    while (p) {
      lib3ds_vector_min(min, p->position);
      lib3ds_vector_max(max, p->position);
      if (p->spot_light) {
        lib3ds_vector_min(min, p->spot);
        lib3ds_vector_max(max, p->spot);
      }
      p=p->next;
    }
  }
}