No, actually you can load more vector layers over a raster map using nviz
for example you can type
nviz elevation=dem vect=streets,streams
and you will be loading two vector layers (streets and streams) over a raster dem map.
If you have nviz already loaded you have to go to Visualize/Lines 3D Polygons or Points and use “New” button. To switch the layer configuration just pick the button with name of the layer in front of “Current”.
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Juan David Rondón Díaz
Tesista de Ingeniería Ambiental
Universidad Distrital Francisco José de Caldas