Single grain extraction

[sajutabraham]

I would like to visualize a single grain (in 3D) from a tessellated microstructure, before and after meshing. Can somebody help, please?

[rquey]

Use -showcell id==... for the tessellation ("before meshing") and `-showelset id=..." for the mesh ("after meshing"). Here is an example:

neper -T -n 10 -reg 1 -o n10
neper -M n10.tess
neper -V n10.tess,n10.msh -dataedgerad 0.003 -showtess 1 -showmesh 0 -showcell "id==3" -print before -showtess 0 -showmesh 1  -dataelt1drad 0.003 -dataelt3dedgerad 0.0015 -showelset "id==3"  -showelt1d elt3d_shown -print after

or, more simply,

neper -V n10.tess,n10.msh -dataelt1drad 0.003 -showelset "id==3" -showelt1d elt3d_shown -dataelt3dedgerad 0 -print before -dataelt3dedgerad 0.0015 -print after

[sajutabraham]

Thank you very much. But it seems to be a difficult task if the number of grains in a polycrystal is more and we are interested in visualizing only grains with some particular shapes.

[rquey]

See the documentation of option -showelset, which can take various arguments. This is a highly customizable option. For example, to view all cells that have a sphericity higher than 0.85, use -showelset "sphericity>0.85", etc. You can also specify which elsets to show using -showelset "file(...)".

[sajutabraham]

Thank you very much!