Hi Alessandro, Could you tell me which version are you using, or you can try it using the latest master branch. To generate a csv file, you just need to change the file name "1cylQ3D_msh2_2059.dat" to "1cylQ3D_msh2_2059.csv", or "file2.dat" to "file2.csv". By the way, I just tested your commands on the latest master branch. It seems nothing goes wrong. Commands mpirun -np 4 ../FieldConvert-g -m interppoints:fromxml=ChanFlow_3DH1D_Parallel_mode1.xml:fromfld=ChanFlow_3DH1D_Parallel_mode1.fld:box=10,10,10,0,1,0,1,0,1 data.dat and mpirun -np 1 ../FieldConvert-g -m interppoints:fromxml=ChanFlow_3DH1D_Parallel_mode1.xml:fromfld=ChanFlow_3DH1D_Parallel_mode1.fld:topts=point.csv data.dat generate ASCII files in tecplot format, like ============================ Variables = x, y, z, u, v, w, p Zone, I=10, J=10, K=10, F=POINT 0 0 0 0 0 0 2 0.111111 0 0 0 0 0 1.77778 0.222222 0 0 0 0 0 1.55556 0.333333 0 0 0 0 0 1.33333 ============================= or Variables = x, y, z, u, v, w, p Zone, I=3, F=POINT 0 0 0 0 0 0 2 0 0.5 0 0.25 0 0 2 0.5 0.5 0.1 0.25 -3.1661e-17 0 1 ============================= Cheers Ankang ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Alessandro Alberto de Lima <aalima@usp.br> Sent: 21 September 2021 19:37 To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] FieldConvert This email from aalima@usp.br originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hi, I'm trying to convert a field to some specific points. I tried to use: mpirun -np 32 FieldConvert-rg -m interppoints:fromxml=1cylQ3D_msh2.xml:fromfld=1cylQ3D_msh2.fld:box=400,200,300,-1.0,3.0,-1.0,1.0,0.001,3.0 1cylQ3D_msh2_2059.dat and i get a "Segmentation fault" as result. Then I tried as a simple test: FieldConvert -m interppoints:fromxml=1cylQ3D_msh2.xml:fromfld=1cylQ3D_msh2.fld:topts=file.csv file2.dat The file.csv: # x, y, z 5.0,-2.0,1.0 7.5,2.0,1.0 8.0,5.0,1.0 And had the same "Segmentation fault" as result. Before all of that, i was converting my fields to paraview and then converting to csv files. I'm spanding to much time. There is a method to generate a csv field direct from nektar? Thank you for your support. Alessandro