[GRASS-windows] NVIZ problem with 3D polygons

[del cadarn]

Bonjour,


I've also posted this on the GRASS-users mailist but since I didn't receive an answer, I thought I might try this one.

I am having problems to see vectors I have added height to with 
v.extrude . The trick is that I am actually using the e.g. given in 
NETELER, M and H. MITASOVA Open Source GIS a GRASS GIS Approach with the North Carolina sample data. So in theory, this example should really be working...


Here is what I did 


g.region rast=el_D792_6m -p


v.extract P079215 out=bldg_resid_a where="layer='BLDG_RESID_BL'"

v.extract P079215 out=bldg_cmcl_a where="layer='BLDG_COMMER_BL'"


v.extrude -t bldg_resid_a out=bldg_resid_a_3d height=10 elev=el_D792_6m

v.extrude -t bldg_cmcl_a out=bldg_cmcl_a_3d height=15 elev=el_D792_6m


g.region rural_1m -p

nviz elev_lid792_1m col=ortho_2001_t792_1m vect=bldg_resid_a_3d,bldg_cmcl_a_3d


I am using Grass 6.4.1 with the python GUI on Windows 7


Now the infamous result is just some line on what should be the 
height of the building, like if NVIZ read it as lines rather than 3D 
surface...




I've
 encountered also this problem when I tried to visualised a DXF file in 
NVIZ. The windmill shows up but in broken lines which is no good to me.




Thank you for your help, I'm very new to GIS and Open Source, 
and I must admit I don't know where to find the ressources to help...

                                          Delphine
	 		 	   		   		 	   		  
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