[GRASSLIST:556] Re: raster 3d from DEMs

[Hamish]

> I created a couple DEMs from drillhole data, DEMs represent a
> geological boundary (e.g. Triassic/Jurassic), now i want  to fill
> space between this boundary and create a raster 3d. Is it possible to
> do, i suppose - yes, but how to do it.

Is v.vol.rst what you are looking for?
  http://grass.ibiblio.org/grass61/manuals/html61_user/v.vol.rst.html

see also 
  http://grass.ibiblio.org/grass61/manuals/html61_user/raster3dintro.html
  http://grass.ibiblio.org/grass61/manuals/html61_user/raster3D.html



Hamish