[GRASS5] 3D flyover from DEM?

[David Piasecki]

Aside from simply setting a point of reference and drawing a static map 
based on a DEM, is there a way to generate a 3D map which I can use as 
some sort of fly-over? In other words, with a DEM and a 2D image 
overlaid on top, I'd like to generate a file that I can use in a 3D 
viewer (perhaps Quicktime or something similar) which enables me to 
zoom in and out and change my point of reference without going back to 
GRASS to redraw.

Thanks,
David