Tesselation with fiber orientation - changed behaviour form v4.2 to v4.4.2

[michalkalkowski]

Hi,

I used neper to generate a 2D tesselation with fiber orientation, then rotated by a certain angle.
However, I noticed that the orientation output differs for the same command over the two versions. I did not find an explanation for the changed behaviour - can you explain why the change and how this should be understood?
command used:

neper -T -dim 2 -id 1 -domain "square(60, 10)" -n 5000 -ori "fiber(0,0,1,0,1,0)" -transform "scale(1, 8, 1),rotate(0,0,1,30)" -oridescriptor "euler-bunge" -format "tess,ori" -o test_30_441
output orientations for v4.4.1:

-180.000000000000 90.000000000000 41.975192057725
180.000000000000 90.000000000000 -117.505742464530
-180.000000000000 90.000000000000 50.562613184348
-180.000000000000 90.000000000000 71.730660197623
-180.000000000000 90.000000000000 41.725771745734
-180.000000000000 90.000000000000 70.710510813742
...

output orientations for v4.2:

-168.024807942275 90.000000000000 30.000000000000
32.494257535470 90.000000000000 30.000000000000
-159.437386815652 90.000000000000 30.000000000000
-138.269339802377 90.000000000000 30.000000000000
-168.274228254266 90.000000000000 30.000000000000
-139.289489186258 90.000000000000 30.000000000000
103.575792782177 90.000000000000 30.000000000000
...

What is neper doing? Why the change?
Thanks!
Michal

[rquey]

There has been a move from fiber(<dirs_x>,<dirs_y>,<dirs_z>,<dirc_x>,<dirc_y>,<dirc_z>) to fiber(<dirc_x>,<dirc_y>,<dirc_z>,<dirs_x>,<dirs_y>,<dirs_z>) between the two versions you mentionned. You can find the new definition here. Sorry this hasn't been reported properly in the VERSIONS file...

The reason is that the ordering is more natural, and that changes have to happen at some point...

[michalkalkowski]

Great, thanks! I did not notice the difference in the definition. All clear now.