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
 

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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