density of imported mesh

Hi Christoph,
We can assign the properties of mesh wall/sphere from atom_type value. Can we assign density of that mesh wall/sphere like this way?
....
create_box 2 reg
group sphere type 2
set group sphere density 2500
...
..
fix cad all mesh/gran/stressanalysis stl/sphere.stl 2 0.1 0 0 0 0. 0. 0.
...
...
Will it change the density of sphere.stl?
Thanks
Ram