[GRASS-user] Extracting from 2D to 3D

[charles]

Thanks Markus for the help and all who responded.  I will try it.

ch
On Aug 30, 2008, at 12:26 AM, Markus Neteler wrote:

> Charles,
>
> On Sat, Aug 23, 2008 at 10:38 PM, charles <eriseres at airpost.net>  
> wrote:
>> Hello all,
>>
>> I have purchased to book, Open Source Grass, the third edition and  
>> wanted to
>> experiment with 3D vectors using nviz.  I have followed the  
>> commands in the
>> book, page 209/210 but can not display the 3D vectors in nviz.  Is  
>> there an
>> update to the commands or can anyone describe to me what I am  
>> doing wrong.
>
> indeed, there is an extra step needed: the lines in the DXF files  
> need to
> be converted to boundaries and then centroids have to be added.
> v.extrude will change otherwise the lines simply to 3D lines.
>
> I have posted a correction at:
> http://www.grassbook.org/errata_menu3rd.php
>
> Then nviz shows the 3D house blocks.
>
> Thanks for bringing this up,
> Markus