[GRASS-user] Re: <v.triangle> -- module to produce TIN with "breaklines" using <Triangle> utility

[amuriy]

Sylvain Maillard wrote
> 
> I'm not sure to understand the difference between your v.triangle and the
> v.delaunay (
> http://grass.osgeo.org/grass64/manuals/html64_user/v.delaunay.html)
> already
> in grass core ... for what I see in your pdf exemple, it seems that your
> new module is giving almost the same result as v.delaunay would do ...
> 
> can you explain the differences ? 
> 

The difference exists. <v.delaunay> don't work with "breaklines", e.g. with
constrained Delaunay triangulation, but <Triangle> does (also conforming
triangulation & quality meshing).

About constructing TIN's with "breaklines": 
-- http://www.ian-ko.com/resources/triangulated_irregular_network.htm
--
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/What_is_a_TIN_surface/006000000001000000/     

One of problems is "soft" breaklines that not change surface continuity -- I
experimented with them in GRASS, but not through <Triangle>.. 

P.S. Just try to run <v.triangle>
P.P.S. I will make a page on GRASS-Wiki to explain the work of this module
:)

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