private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
          getLocalAnchorAFieldBuilder();
          getLocalAnchorBFieldBuilder();
          getLocalAxisAFieldBuilder();
          getGroundAnchorAFieldBuilder();
          getGroundAnchorBFieldBuilder();
          getTargetFieldBuilder();
        }
      }