Volume rendering failing on large runs, with this warning.
Warning: In /projects/viz/paraview/src/ParaView/5.4.0-sb/ParaView5/VTK/Filters/Parallel/vtkPKdTree.cxx, line 208 vtkPKdTree (0x9729750): (process 0) memory allocation on a remote node (BreadthFirstDivide)