message: fixing transforms for obj importer
diff: #include <cstring>
  #include <sstream>
  +#define USE_INSTANCES 0
  +
  namespace ospray {
  namespace sg {
  @@ -172,6 +174,10 @@ namespace ospray {
  std::string base_name = fileName.name() + '_';
  int shapeId = 0;
  +#if !USE_INSTANCES
  + auto objInstance = createNode("instance", "Instance");
  + world->add(objInstance);
  +#endif
  for (auto &shape : shapes) {
  for (int numVertsInFace : shape.mesh.num_face_vertices) {
  if (numVertsInFace != 3) {
  @@ -264,17 +270,16 @@ namespace ospray {
  // group put in a separate instance. In the future, we want to
  // support letting the user (ospExampleViewer, for starters)
  // specify if each group should be placed in an instance or not.
  -#if 0
  +#if USE_INSTANCES
  auto instance = createNode(name + "_instance", "Instance");
  instance->setChild("model", model);
  model->setParent(instance);
  world->add(instance);
  #else
  - world->add(mesh);
  + (*objInstance)["model"].add(mesh);
  #endif
  }
  }
  -
  } // ::ospray::sg
  } // ::ospray
  