message: We no longer need the voxelrange setup stuff
  I think this is also waht's causing the hang
diff: @@ -155,23 +155,8 @@ namespace ospray {
  ddBlock[i].ispcVolume = ddBlock[i].cppVolume->getIE();
  -#ifndef OSPRAY_VOLUME_VOXELRANGE_IN_APP
  - ManagedObject::Param *param = ddBlock[i].cppVolume->findParam("voxelRange");
  - if (param != NULL && param->type == OSP_FLOAT2){
  - vec2f blockRange = param->u_vec2f;
  - voxelRange.x = std::min(voxelRange.x, blockRange.x);
  - voxelRange.y = std::max(voxelRange.y, blockRange.y);
  - }
  -#endif
  }
  -#ifndef OSPRAY_VOLUME_VOXELRANGE_IN_APP
  - // Do a reduction here to worker 0 since it will be queried for the voxel range by the display node
  - vec2f globalVoxelRange = voxelRange;
  - MPI_CALL(Reduce(&voxelRange.x, &globalVoxelRange.x, 1, MPI_FLOAT, MPI_MIN, 0, mpi::worker.comm));
  - MPI_CALL(Reduce(&voxelRange.y, &globalVoxelRange.y, 1, MPI_FLOAT, MPI_MAX, 0, mpi::worker.comm));
  - set("voxelRange", globalVoxelRange);
  -#endif
  return true;
  }
  