Hi Patrick,rnrn1. Did you change the compiler flags in “”Makefile.inc””? There should be PARALLEL_MODE := MPI and the compiler changed to your parallel one.rn2. They come from the voxilization in “”stlreader.read(blockGeometry, 0u, 250);””. Here, 250 indicated the resolution in 0u, i.e. x-direction.rnrnJo