message: remove unused 'root' node in sg example viewer
diff: @@ -98,13 +98,11 @@ int main(int ac, const char **av)
  parseFilesFromCommandLine(ac, av);
  sg::RenderContext ctx;
  - auto root = sg::createNode("ospray");
  auto renderer = sg::createNode("renderer", "Renderer");
  renderer["shadowsEnabled"]->setValue(true);
  renderer["aoSamples"]->setValue(1);
  renderer["camera"]["fovy"]->setValue(60.f);
  - root->add(renderer);
  auto lights = renderer["lights"];
  @@ -136,8 +134,8 @@ int main(int ac, const char **av)
  }
  if (debug) {
  - root->traverse(ctx, "verify");
  - root->traverse(ctx, "print");
  + renderer->traverse(ctx, "verify");
  + renderer->traverse(ctx, "print");
  }
  renderer->traverse(ctx, "commit");
  