Hi,
i have updated "v.out.vtk" to support "layer" category selection
and made a screenshot, showing grass 3d vectors
(exported with v.out.vtk) within Paraview from the spearfish60 location.
http://www-pool.math.tu-berlin.de/~soeren/grass/modules/screenshots/v.out.vtk-r.out.vtk-comb.png
The 3d vectors are are 2d vectors (roads, streams and bugsites)
from spearfsih60 which has been modified with "v.drape".
v.out.vtk is available at:
http://www-pool.math.tu-berlin.de/~soeren/grass/modules/
Best regards
Soeren