message: signed/unsigned warning
diff: @@ -216,7 +216,7 @@ namespace ospray {
  if (dataType == VKL_DATA) {
  std::vector<VKLData> blockData;
  - for (int i = 0; i < data->size(); ++i)
  + for (size_t i = 0; i < data->size(); ++i)
  {
  Data* ospData = ((Data**)data->data())[i];
  VKLDataType vklDataType = getVKLDataType(ospData->type);
  