message: Store name along with material
diff: @@ -1744,6 +1744,13 @@ void vsnray_writer::write_surface_properties(Object obj, std::shared_ptr<sg::sur
  if (sp->material() != nullptr)
  {
  + rapidjson::Value name(sp->material()->name().c_str(), allocator);
  + obj.AddMember(
  + rapidjson::StringRef("name"),
  + name,
  + allocator
  + );
  +
  rapidjson::Value jmat;
  jmat.SetObject();
  