[GRASS-user] 3D peat modeling

[whyduck]

Hello all,
I'm in GRASS for a week and I try to model develope phases of peat from a
drillhole data. I have seen previous posts about the same problem
(geological) but I always get some errors repeating the steps.

I have boundary of peat imported from Microstation with v.in.ogr and then I
created 2D mask.
Then I have drillhole data (5 vector point files) also imported from
MicroStation with v.in.dxf
Afterwards I made 5 rasters of peat (bottom-spag_rst_mask , gyttja-gytia...,
peat1-mech1.., peat2-oles..., top-mech2) withv.surf.rst with the mask I
mentioned above.

I tried to have r.to.rast3 but I got this error 
http://monki.us/~kamil/grass/1.txt LINK  . I added the layes from the bottom
to top. I dont know maybe some 3D regional problem?
Another approach was with r.to.rast3elev but I got an error to 
http://monki.us/~kamil/grass/2.txt LINK  the sequence of adding layers from
the bottom.

My aim is to get something like this 
http://opengeology.pl/files2/Image/3d/brom_isosur.png AIM  I mean each 3D
layer(phase) with different colour but I have no idea how to do this.
v.vol.rst ???
It would be nice to have shown drillholes (x,y) 
doesn't matter if I get the results in nviz or paraview, I have both.

Just like I said before I'm beginer in grass and I realise I could have
basic errors doing my job.
I appreciate the respond as quick as you can.
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