[GRASS5] TINs as 3D vectors

Radim Blazek blazek at itc.it
Tue Apr 19 04:14:37 EDT 2005

Triangle does not appear to have a clear license compatible with GPL:

"Please note that although Triangle is freely available, it is 
copyrighted by the author and may not be sold or included in commercial 
products without a license."

Am I wrong? If you want to include that to GRASS distribution, the 
library must have a license which gives at least the same rights as GPL.

Do you have a module for conversion from raster to TIN?

How do you store the data, do you use your format? Did you try to use 
GRASS format?


Pieter Bos wrote:
> There is no possibility of creating 3D-vectors from v.delaunay directly.
> We are currently implementing a system for vague regions in GRASS that
> uses triangulations with 3D vectors, and have linked Triangle to GRASS.
> Triangle is a much faster and memory efficient delaunay triangulation
> with support for constraints. See
> http://www-2.cs.cmu.edu/~quake/triangle.html for more information.
> As soon as everything is done we'll release a few useful GRASS modules,
> including this better Delaunay triangulation and the 2D alpha-shape
> algorithm, and perhaps some 2D visualization of TINs which might be
> useful as a general module with some slight modifications. If you need
> it now I can send you the module.
> Regards,
> Pieter Bos
> -----Original Message-----
> From: grass5-admin at grass.itc.it [mailto:grass5-admin at grass.itc.it] On
> Behalf Of Jachym Cepicky
> Sent: Wednesday, April 13, 2005 2:10 PM
> To: GRASS Developers list
> Subject: [GRASS5] TINs as 3D vectors
> Hallo,
> is there any possibilty, how to create 3D-vector of TIN (triangulated
> irregular network) of the output from v.delauny? I have 3D points and
> v.delauny makes only 2D-polygons from it.. 
> I wrote some script which solves this, but before I post it, I would
> like to know, that I did not something useless.
> Thank you a lot
> Jachym
> --
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
> GPG: http://www.fle.czu.cz/~jachym/gnupg_public_key/
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