elongated grains along arbitrary direction (not x, y, z direction) with Raster tessellation?

[damulaoshi]

Dear Romain,
Is there anyway to generate elongated grains along the arbitrary direction (not x, y, z directions) if I want to use raster tessellation?
For Voronoi tessellation, it works fine with the code:
neper -T -n from_morpho -domain "cube(300,300,300):rotate(0,0,1,25):scale(0.5,2,1)" -morpho "diameq:lognormal(30,3)" -transform "scale(2,0.5,1),rotate(0,0,1,-25)" -format tess -statcell vol,diameq,coo -morphooptistop "val=1e-2" -o elongated_test;

And the figure is here:

But whenever I use Raster tessellation (the code below):
neper -T -n from_morpho -domain "cube(300,300,300):rotate(0,0,1,25):scale(0.5,2,1)" -morpho "diameq:lognormal(30,3)" -transform "scale(2,0.5,1),rotate(0,0,1,-25)" -tesrsize 100 -format tesr -statcell vol,diameq,coo -morphooptistop "val=1e-2" -statvox cell,coo -o elongated_raster;

Then the plot figure is very strange:

How to generate these elongated grains along arbitrary directions with Raster tessellation?

Thanks before!
Best regards

[rquey]

This looks like a nasty bug... but please provide a minimal working example as described here:

Provide a minimal working example that can be used to reproduce the bug, that is, complete but excluding unnecessary options, large inputs and excessive computation times. The example should include the program commands and other necessary input, and the terminal output.