message: making obj importer use instance
diff: @@ -497,9 +497,14 @@ namespace ospray {
  ss << fullPath.name() << "_" << counter++ << "_" << curGroupName;
  std::string name = ss.str();
  //scenegraph
  - std::shared_ptr<TriangleMesh> mesh =
  + auto mesh =
  std::static_pointer_cast<TriangleMesh>(createNode(name, "TriangleMesh"));
  - world->add(mesh);
  + auto model = createNode(name+"_model", "Model");
  + auto instance = createNode(name+"_instance", "Instance");
  + model->add(mesh);
  + instance->setChild("model", model);
  + model->setParent(instance);
  + world->add(instance);
  mesh->vertex = std::make_shared<DataVector3f>();
  mesh->normal = std::make_shared<DataVector3f>();
  mesh->texcoord = std::make_shared<DataVector2f>();
  