[GRASS-user] Nviz and vector

[Anna Kratochvílová]

On Sun, Nov 4, 2012 at 8:46 PM, Markus Neteler <neteler at osgeo.org> wrote:
> On Thu, Sep 20, 2012 at 4:46 PM, charlie <carowan at yahoo.com> wrote:
>> Hi.  I just started using nviz, and I have been able to sucessfully display
>> raster DEM's and vector lines  (roads).  However, I have been trying to add
>> a vector layer of polygons depicting areas of open space, but only the
>> border of the area is projected as a 1px line, the fill remains transparent.
>> In an attempt to correct this, I elevated the vector off the DEM, but with
>> the same result.
>
> To my knowledge a non-feature...

In gvd.c, there is:
...
	    else {		
		/* 2D polygons */
		/* TODO */
	    }
>
>> Both the vector and raster layers display correctly when viewed in 2D.
>>
>> Is this an expected outcome, or an error on my part? How do I work around
>> this?  Should I convert the vector to raster, with v.to.rast and then add it
>> as an additional layer to show the area fill?
>

It is possible to convert the 2D areas to 3D and then display in
wxnviz. For example in case of lakes you could assign different z
coordinate to each lake (although I'm not sure how).
However it is not clear to me how the 2D polygon should be rendered in
3D view in a general case.

> Yes, that would be the fastest solution.
> I hope that the new wxNVIZ addresses this problem.

Please, don't forget that the underlying library is the same for tcltk nviz

Anna

>
> Markus
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