Sorry ,for the time i take,But i try other free 3D softwares (to the all peoples can make the change) to the next chapter...
Wings3D make UVs errors after editing
(But this is the only one free,i find ,that can "redraw" the .OBJ to import in .GR2 editor...)
Ps:MeshLab is actualy,seem to be a good "pretending"