[GRASSLIST:7387] 3d point vectors in nviz

[benducke at compuserve.de]

Has anyone successfully managed to get a 3D points cloud
to display correctly in nviz?
I checked 3D region settings and the structure of the
vector file itself. The data and settings seem fine.
I can display the zcoords with d.vect and it looks
ok.
However, when I load the map into nviz, I only get
to see the top points of the vector map (i.e. I get 
to see as much as the top-down view by d.vect), 
the remaining points do not get displayed.

I would very much appreciate any help!

Benjamin