[GRASS-user] From 3d vector to DEM

[Joba]

Hello, I'm a newbee and struggling for days now to get a Google Sketchup
drawing to a DEM. 

I'm able to import the coordinates via GML (copy paste coords from KMZ). So
now I have a surface which I want to convert to DEM. v.surf.rst only works
with points and isolines. Is there a smart way to produce isolines from the
3d-surface? Thx!
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