message: On VDB load, load last grid if more than one
diff: @@ -157,10 +157,12 @@ namespace ospray {
  std::cout << " : " << n << std::endl;
  }
  + auto gridNum = gridNames.size() - 1;
  +
  // XXX at some point, add the ability to select which grid(s). For now,
  // just choose the first.
  - std::cout << " loading grid: " << gridNames[0] << std::endl;
  - grid = file.readGrid(gridNames[0]);
  + std::cout << " loading grid: " << gridNames[gridNum] << std::endl;
  + grid = file.readGrid(gridNames[gridNum]);
  file.close();
  } catch (const std::exception &e) {
  const std::string err = (std::string("Error loading ")
  