private void Repair(Catalog<Material.Material> materials, Catalog<Section.Section> sections)
{
foreach (Section.FrameSection sec in sections)
{
if (sec.Material == null)
sec.Material = Material.MaterialManager.Instance.DefaultSteel;
else if (materials[sec.Material.Name] == null)
materials[sec.Material.Name] = sec.Material;
else if (materials[sec.Material.Name] != sec.Material)
sec.Material = materials[sec.Material.Name];
}
}